Rev.4.1_00 SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR S-8355/56/57/58 Series The S-8355/56/57/58 Series is a CMOS step-up switching regulator which mainly consists of a reference voltage source, an oscillation circuit, an error amplifier, a phase compensation circuit, a PWM control circuit (S-8355/57) and a PWM/PFM switching control circuit (S-8356/58). With an external low-on-resistance Nch Power MOS, this product is ideal for applications requiring high efficiency and a high output current. The S-8355/57 Series realizes low ripple, high efficiency, and excellent transient characteristics due to a PWM control circuit whose duty ratio can be varied from 0% to 83% (from 0% to 78% for 250 kHz, 300 kHz, and 600 kHz models), an excellently designed error amplifier and a phase compensation circuit. S-8356/58 Series operation can be switched under a light load to a PFM control circuit with a duty ratio of 15% via a PWM/PFM switching control circuit to prevent a decline in the efficiency due to the IC operating current. Features * Low voltage operation: Startup is guaranteed from 0.9 V (IOUT = 1 mA) * Low current consumption: During operation: 25.9 A (3.3 V, 100 kHz, typ.) During shutdown: 0.5 A (max.) * Duty ratio: Built-in PWM/PFM switching control circuit (S-8356/58) 15 to 83% (100 kHz models), 15 to 78% (250 kHz, 300 kHz, and 600 kHz models) * External parts: Coil, diode, capacitor, and transistor * Output voltage: Can be set between 1.5 and 6.5 V (for VDD/VOUT separate types) or 2.0 and 6.5 V (for other than VDD/VOUT separate types) in 0.1 V steps. Accuracy of 2.4%. * Oscillation frequency: 100 kHz, 250 kHz, 300 kHz, 600 kHz * Soft start function: 6 ms (100 kHz, typ.) * Shutdown function Packages * SOT-89-3 * SOT-23-3 * SOT-23-5 * 6-Pin SNB(B) (Package code: UP003-A) (Package code: MP003-A) (Package code: MP005-A) (Package code: BD006-A) Applications * Power supplies for portable equipment such as digital cameras, electronic notebooks, and PDAs * Power supplies for audio equipment such as portable CD/MD players * Constant voltage power supplies for cameras, video equipment, and communications equipment * Power supplies for microprocessors Seiko Instruments Inc. 1 SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series Block Diagram (1) S-8357/58 Series B, H, F Type (2) S-8357/58 Series B, H, F, N Type (With shutdown function) (Without shutdown function) VOUT VOUT Oscillation Circuit EXT Oscillation Circuit IC internal power supply PWM or PWM /PFM switching control circuit Soft start built-in reference power supply + - Phase compensation circuit EXT IC internal power supply PWM or PWM /PFM switching control circuit + - Soft start built-in reference power supply VSS Phase compensation circuit VSS ON/OFF Figure 1 Figure 2 (3) S-8357/58 Series E, J, G, P Type (4) S-8355/56 Series K, L, M, Q Type (VDD/VOUT separate type) VOUT VDD Oscillation Circuit EXT PWM or PWM /PFM switching control circuit Soft start built-in reference power supply Oscillation Circuit + - Phase compensation circuit EXT VSS IC internal power supply PWM or PWM /PFM switching control circuit Soft start built-in reference power supply + - Phase compensation circuit ON/OFF Figure 3 2 VOUT VDD IC internal power supply Figure 4 Seiko Instruments Inc. VSS SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series Selection Guide * The control types, product types, output voltage, and packages for the S-8355/56/57/58 Series can be selected at the user's request. Please refer to the "Product name selection guide" for the definition of the product name and "Product Name List" for the full product names. 1. Function List 1-1. PWM control products Table 1 Switching Frequency (kHz) Shutdown Function VDD/VOUT Separate Type S-8355KxxMC 100 Yes Yes SOT-23-5 Applications requiring variable output voltage and a shutdown function S-8355LxxMC/BD 250 Yes Yes SOT-23-5/6-Pin SNB(B) Applications requiring variable output voltage, a shutdown function, and a thin coil S-8355MxxMC/BD 300 Yes Yes SOT-23-5/6 Pin-SNB(B) Applications requiring variable output voltage, a shutdown function, and a thin coil S-8355QxxMC/BD 600 Yes Yes SOT-23-5/6-Pin SNB(B) Applications requiring variable output voltage, a shutdown function, and a thin coil S-8357BxxMC 100 Yes SOT-23-5 Applications requiring a shutdown function S-8357BxxMA 100 SOT-23-3 Applications not requiring a shutdown function S-8357BxxUA 100 SOT-89-3 Applications not requiring a shutdown function S-8357ExxMC 100 Yes SOT-23-5 Applications in which output voltage is adjusted by external resistor S-8357FxxMC/BD 300 Yes SOT-23-5/6-Pin SNB(B) Applications requiring a shutdown function and a thin coil S-8357GxxMC/BD 300 Yes SOT-23-5/6-Pin SNB(B) Applications requiring variable output voltage and a thin coil S-8357HxxMC/BD 250 Yes SOT-23-5/6-Pin SNB(B) Applications requiring a shutdown function and a thin coil S-8357JxxMC/BD 250 Yes SOT-23-5/6-Pin SNB(B) S-8357NxxMC/BD 600 Yes SOT-23-5/6-Pin SNB(B) S-8357PxxMC/BD 600 Yes SOT-23-5/6-Pin SNB(B) Product Name Package Application Applications requiring variable output voltage with an external resistor and a thin coil Applications requiring a shutdown function and a thin coil Applications requiring variable output voltage with an external resistor and a thin coil 1-2. PWM/PFM switching control products Table 2 Product name Switching Frequency (kHz) Shutdown Function VDD/VOUT Separate Type Package Application S-8356KxxMC 100 Yes Yes SOT-23-5 Applications requiring variable output voltage and a shutdown function S-8356LxxMC/BD 250 Yes Yes SOT-23-5/6-Pin SNB(B) Applications requiring variable output voltage, a shutdown function, and a thin coil S-8356MxxMC/BD 300 Yes Yes SOT-23-5/6-Pin SNB(B) Applications requiring variable output voltage, a shutdown function, and a thin coil S-8356QxxMC/BD 600 Yes Yes SOT-23-5/6-Pin SNB(B) Applications requiring variable output voltage, a shutdown function, and a thin coil S-8358BxxMC 100 Yes SOT-23-5 Applications requiring a shutdown function S-8358BxxMA 100 SOT-23-3 Applications not requiring a shutdown function S-8358BxxUA 100 SOT-89-3 Applications not requiring a shutdown function S-8358ExxMC 100 Yes SOT-23-5 Applications in which output voltage is adjusted by external resistor S-8358FxxMC/BD 300 Yes SOT-23-5/6-Pin SNB(B) Applications requiring a shutdown function and a thin coil S-8358GxxMC/BD 300 Yes SOT-23-5/6-Pin SNB(B) Applications requiring variable output voltage and a thin coil S-8358HxxMC/BD 250 Yes SOT-23-5/6-Pin SNB(B) Applications requiring a shutdown function and a thin coil S-8358JxxMC/BD 250 Yes SOT-23-5/6-Pin SNB(B) S-8358NxxMC/BD 600 Yes SOT-23-5/6-Pin SNB(B) S-8358PxxMC/BD 600 Yes SOT-23-5/6-Pin SNB(B) Applications requiring variable output voltage with an external resistor and a thin coil Applications requiring a shutdown function and a thin coil Applications requiring variable output voltage with an external resistor and a thin coil Seiko Instruments Inc. 3 SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series 2. Package and Function List by Product Type Table 3 Series Name S-8355 Series S-8356 Series S-8357 Series S-8358 Series 4 Type K, L, M, Q (Shutdown function + VDD/VOUT separate type) K = 100 kHz, L = 250 kHz, M = 300 kHz, Q = 600 kHz B, H, F (Normal product) B = 100 kHz, H = 250 kHz, F = 300 kHz N (Normal product) N = 600 kHz E, J, G, P (VDD/VOUT separate type) E = 100 kHz, J = 250 kHz, G = 300 kHz, P = 600 kHz B, H, F (Normal product) B = 100 kHz, H = 250 kHz, F = 300 kHz N (Normal product) N = 600 kHz E, J, G, P (VDD /VOUT separate type) E = 100 kHz, J = 250 kHz, G = 300 kHz, P = 600 kHz Seiko Instruments Inc. Package Name (Abbreviation) Shutdown Function Yes/No VDD/VOUT Separate Type Yes/No MC/BD Yes Yes MA/UA No MC/BD Yes MC/BD Yes No MC/BD No Yes MA/UA No No No MC/BD Yes MC/BD Yes No MC/BD No Yes SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series 3. Product Name S-835 x x xx xx - xxx - Tx IC direction in tape specifications *1 T2: SOT-89-3, SOT-23-3, SOT-23-5 TF: 6-Pin SNB(B) Product name (abbreviation) *2 Package name (abbreviation) UA: SOT-89-3 MA: SOT-23-3 MC: SOT-23-5 BD: 6-Pin-SNB(B) Output voltage 15 to 65 (Ex. When the output voltage is 1.5 V, it is expressed as 15.) Product type B: H: F: N: E: J: G: P: K: L: M: Q: Normal product, fOSC = 100 kHz (S-8357/58) Normal product, fOSC = 250 kHz (S-8357/58) Normal product, fOSC = 300 kHz (S-8357/58) Normal product, fOSC = 600 kHz (S-8357/58) VDD/VOUT separate type, fOSC = 100 kHz (S-8357/58) VDD/VOUT separate type, fOSC = 250 kHz (S-8357/58) VDD/VOUT separate type, fOSC = 300 kHz (S-8357/58) VDD/VOUT separate type, fOSC = 600 kHz (S-8357/58) Shutdown function + VDD/VOUT separate type, fOSC = 100 kHz (S-8355/56) Shutdown function + VDD/VOUT separate type, fOSC = 250 kHz (S-8355/56) Shutdown function + VDD/VOUT separate type, fOSC = 300 kHz (S-8355/56) Shutdown function + VDD/VOUT separate type, fOSC = 600 kHz (S-8355/56) Control system 5 or 7: PWM control 6 or 8: PWM/PFM switching control *1. Please refer to the taping specifications at the end of this document. *2. Please refer to the product name list. Seiko Instruments Inc. 5 SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series 4. Product Name List 4-1. S-8355 Series Table 4 Model S-8355KxxMC Series S-8355LxxMC Series S-8355MxxMC Series S-8355MxxBD Series S-8355QxxBD Series 1.5 V S-8355Q15BD-OWA-TF 1.8 V S-8355K18MC-NAD-T2 S-8355M18MC-MCD-T2 S-8355M18BD-MCD-TF 2.0 V S-8355K20MC-NAF-T2 S-8355L20MC-NCF-T2 S-8355M20MC-MCF-T2 3.1 V S-8355K31MC-NAQ-T2 S-8355M31MC-MCQ-T2 3.3 V S-8355K33MC-NAS-T2 3.4 V S-8355M34MC-MCT-T2 5.0 V S-8355K50MC-NBJ-T2 S-8355M50MC-MDJ-T2 Output Voltage 5.5 V S-8355M55MC-MDO-T2 Remark Please consult our sales person for products with an output voltage other than those specified above. 4-2. S-8356 Series Table 5 Model S-8356KxxMC Series S-8356MxxMC Series S-8355MxxBD Series 1.8 V S-8356K18MC-NED-T2 S-8356M18MC-MED-T2 S-8356M18BD-MED-TF 3.0 V S-8356M30MC-MEP-T2 3.3 V S-8356K33MC-NES-T2 S-8356Q33MC-OYS-T2 5.0 V S-8356K50MC-NFJ-T2 S-8356M50MC-MFJ-T2 S-8356Q50MC-OVJ-T2 Output Voltage S-8356QxxMC Series Remark Please consult our sales person for products with an output voltage other than those specified above. 4-3. S-8357 Series (1) Table 6 Model S-8357BxxMC Series S-8357BxxMA Series S-8357BxxUA Series S-8357ExxMC Series S-8357FxxMC Series 2.0 V S-8357E20MC-NKF-T2 2.5 V Output Voltage 2.6 V S-8357B26MC-NIL-T2 3.0 V S-8357B30MC-NIP-T2 S-8357B30MA-NIP-T2 3.1 V 3.2 V S-8357F32MC-MGR-T2 3.3 V S-8357B33MC-NIS-T2 S-8357B33MA-NIS-T2 S-8357B33UA-NIS-T2 S-8357F33MC-MGS-T2 3.5 V 3.6 V S-8357B36MC-NIV-T2 4.8 V S-8357B48MC-NJH-T2 S-8357B48UA-NJH-T2 5.0 V S-8357B50MC-NJJ-T2 S-8357B50MA-NJJ-T2 S-8357B50UA-NJJ-T2 S-8357E50MC-NLJ-T2 S-8357F50MC-MHJ-T2 5.2 V S-8357B52MC-NJL-T2 5.4 V S-8357B54MC-NJN-T2 6.0 V S-8357B60MC-NJT-T2 Remark Please consult our sales person for products with an output voltage other than those specified above. 6 Seiko Instruments Inc. SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series 4-4. S-8357 Series (2) Table 7 Model S-8357GxxMC Series S-8357HxxMC Series S-8357JxxMC Series S-8357NxxMC Series 2.0 V 2.5 V S-8357J25MC-NOK-T2 2.6 V 3.0 V 3.1 V S-8357H31MC-NMQ-T2 3.2 V 3.3 V S-8357N33MC-O2S-T2 3.5 V S-8357H35MC-NMU-T2 3.6 V S-8357H36MC-NMV-T2 4.8 V 5.0 V S-8357G50MC-MJJ-T2 S-8357J50MC-NPJ-T2 S-8357N50MC-O3J-T2 5.2 V 5.4 V 6.0 V Output Voltage Remark Please consult our sales person for products with an output voltage other than those specified above. 4-5. S-8358 Series (1) Table 8 Model S-8358BxxMC Series S-8358BxxMA Series S-8358BxxUA Series S-8358ExxMC Series S-8358FxxMC Series 2.0 V S-8358E20MC-NSF-T2 2.5 V S-8358B25MC-NQK-T2 2.6 V S-8358B26MC-NQL-T2 3.0 V S-8358B30MC-NQP-T2 3.1 V S-8358B31MC-NQQ-T2 3.2 V S-8357B32MC-NQR-T2 3.3 V S-8358B33MC-NQS-T2 S-8358B33UA-NQS-T2 S-8358F33MC-MKS-T2 3.5 V S-8358B35MC-NQU-T2 3.6 V S-8358B36MC-NQV-T2 3.8 V S-8358B38MC-NQX-T2 5.0 V S-8358B50MC-NRJ-T2 S-8358B50MA-NRJ-T2 S-8358B50UA-NRJ-T2 S-8358E50MC-NTJ-T2 S-8358F50MC-MLJ-T2 5.3 V S-8358F53MC-MLM-T2 6.0 V S-8358B60MC-NRT-T2 Output Voltage Remark Please consult our sales person for products with an output voltage other than those specified above. 4-6. S-8358 Series (2) Table 9 Model S-8357GxxMC Series S-8357HxxMC Series S-8358JxxMC Series 2.0 V 2.5 V 2.6 V 3.0 V S-8358H30MC-NUP-T2 3.1 V 3.2 V 3.3 V S-8358H33MC-NUS-T2 S-8358J33MC-NWS-T2 3.5 V 3.6 V 3.8 V 5.0 V S-8358G50MC-MNJ-T2 S-8358H50MC-NVJ-T2 S-8358J50MC-NXJ-T2 5.3 V 6.0 V Output Voltage Remark Please consult our sales person for products with an output voltage other than those specified above. Seiko Instruments Inc. 7 SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series Pin Assignment Table 10 Products: S-8357/58 Series B, H, F Types (Without shutdown function, VDD/VOUT non-separate type) SOT-89-3 Top view Pin No. 1 2 3 1 2 Pin Name VSS VOUT EXT Functions GND pin Output voltage pin and IC power supply pin External transistor connection pin 3 Figure 5 SOT23-3 Top view Table 11 Products: S-8357/58 Series B, H, F Types (Without shutdown function, VDD/VOUT non-separate type) 1 Pin No. 1 2 3 2 Pin Name VOUT VSS EXT 3 Figure 6 8 Seiko Instruments Inc. Functions Output voltage pin and IC power supply pin GND pin External transistor connection pin SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series SOT23-5 Top view 5 1 4 2 3 Table 12 Products: S-8355/56 Series K, L, M, Q Types (With shutdown function, VDD/VOUT separate type) Pin No. 1 2 Pin Name VOUT VDD 3 ON/OFF 4 5 VSS EXT Functions Output voltage pin IC power supply pin Shutdown pin "H": Normal operation (Step-up operation) "L": Stop step-up (Whole circuit stop) GND pin External transistor connection pin Figure 7 Table 13 Products: S-8357/58 Series B, H, F, N Types (With shutdown function, VDD/VOUT non-separate type) Pin No. Pin Name Functions Shutdown pin 1 ON/OFF "H": Normal operation (Step-up operation) "L": Stop step-up (Whole circuit stop) 2 VOUT Output voltage pin and IC power supply pin *1 3 No connection NC 4 VSS GND pin 5 EXT External transistor connection pin *1. The NC pin indicates electrically open. Table 14 Products: S-8357/58 Series E, J, G, P Types (Without shutdown function, VDD/VOUT separate type) Pin No. Pin Name Functions 1 VOUT Output voltage pin 2 VDD IC power supply pin *1 3 No connection NC 4 VSS GND pin 5 EXT External transistor connection pin *1. The NC pin indicates electrically open. Seiko Instruments Inc. 9 SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series 6-Pin SNB(B) Top view 6 5 4 1 2 3 Figure 8 Table 15 Products: S-8355/56 Series K, L, M, Q Types (With shutdown function, VDD/VOUT separate type) Pin No. Pin Name Functions Shutdown pin 1 ON/OFF "H": Normal operation (Step-up operation) "L": Stop step-up (Whole circuit stop) 2 VOUT Output voltage pin 3 VDD IC power supply pin 4 EXT External transistor connection pin *1 5 No connection NC 6 VSS GND pin *1. The NC pin indicates electrically open. Table 16 Products: S-8357/58 Series B, H, F, N Types (With shutdown function, VDD/VOUT non-separate type) Pin No. 1 Pin Name *1 NC Functions No connection Shutdown pin 2 ON/OFF "H": Normal operation (Step-up operation) "L": Stop step-up (Whole circuit stop) 3 VOUT Output voltage pin and IC power supply pin 4 EXT External transistor connection pin *1 5 No connection NC 6 VSS GND pin *1. The NC pin indicates electrically open. Table 17 Products: S-8357/58 Series E, J, G, P Types (Without shutdown function, VDD/VOUT separate type) Pin No. Pin Name Functions *1 1 No connection NC 2 VOUT Output voltage pin 3 VDD IC power supply pin 4 EXT External transistor connection pin *1 5 No connection NC 6 VSS GND pin *1. The NC pin indicates electrically open. 10 Seiko Instruments Inc. SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series Absolute Maximum Ratings Table 18 Parameter VOUT pin voltage *1 ON/OFF pin voltage *2 VDD pin voltage EXT pin voltage EXT pin current Power dissipation Operating temperature Storage temperature Symbol VEXT PD VOUT VON/OFF VDD B, H, F, N type Others IEXT SOT-89-3 SOT-23-3 SOT-23-5 6-Pin SNB(B) Topr Tstg (Unless otherwise specified: Ta = 25C) Ratings Unit VSS - 0.3 to VSS + 12 VSS - 0.3 to VSS + 12 VSS - 0.3 to VSS + 12 VSS - 0.3 to VOUT + 0.3 VSS - 0.3 to VDD + 0.3 80 500 150 250 90 -40 to +85 -40 to +125 V mA mW C *1. With shutdown function *2. For VDD/VOUT separate types Caution The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be exceeded under any conditions. Seiko Instruments Inc. 11 SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series Electrical Characteristics (1) 100 kHz types (S-835xBxx, S-835xExx, S-835xKxx) Table 19 Parameter Symbol Conditions Output voltage VOUT Input voltage Operation start voltage Oscillation start voltage Operation holding voltage Current consumption 1 VIN VST1 VST2 IOUT = 1 mA No external parts, voltage applied to VOUT IOUT = 1 mA, Measured by decreasing VIN voltage gradually VOUT = VOUT(S) x 0.95 S-835xx15 to 19 S-835xx20 to 29 S-835xx30 to 39 S-835xx40 to 49 S-835xx50 to 59 S-835xx60 to 65 S-835xx15 to 19 VOUT = VOUT(S) + 0.5 S-835xx20 to 29 S-835xx30 to 39 S-835xx40 to 49 S-835xx50 to 59 S-835xx60 to 65 Current consumption 2 Current consumption during shutdown (with shutdown function) EXT pin output current Line regulation Load regulation Output voltage temperature coefficient Oscillation frequency Max. duty ratio PWM/PFM switching duty ratio (S-8356/58) Shutdown pin input voltage (with shutdown function) Shutdown pin input current (with shutdown function) Soft start time Efficiency Min. VOUT(S) x 0.976 - - - (Unless otherwise specified: Ta = 25C) Test Typ. Max. Unit Circuit VOUT(S) - - - V - - - - - - - - - - - - - - 14.0 19.7 25.9 32.6 39.8 47.3 5.6 5.8 5.9 6.1 6.3 6.4 23.4 32.9 43.2 54.4 66.4 78.9 11.1 11.5 11.8 12.1 12.5 12.8 - - 0.5 -4.5 -6.2 -7.8 -10.3 -13.3 -16.1 -18.9 9.5 12.6 15.5 19.2 23.8 27.4 30.3 - - -8.9 -12.3 -15.7 -20.7 -26.7 -32.3 -37.7 19.0 25.2 31.0 38.5 47.6 54.8 60.6 30 30 - - - - - - - - - - - - - - 60 60 mA Ta = -40C to +85C - 50 - ppm/C fOSC MaxDuty VOUT = VOUT(S) x 0.95 VOUT = VOUT(S) x 0.95 85 75 100 83 115 90 kHz % PFMDuty VIN = VOUT(S) - 0.1 V, no load ISS1 ISS2 ISSS VON/OFF = 0 V IEXTH VEXT = VOUT - 0.4 IEXTL VEXT = 0.4 V VOUT1 VOUT2 V OUT Ta * V OUT S-835xx15 to 19 S-835xx20 to 24 S-835xx25 to 29 S-835xx30 to 39 S-835xx40 to 49 S-835xx50 to 59 S-835xx60 to 65 S-835xx15 to 19 S-835xx20 to 24 S-835xx25 to 29 S-835xx30 to 39 S-835xx40 to 49 S-835xx50 to 59 S-835xx60 to 65 VIN = VOUT(S) x 0.4 to x 0.6 IOUT = 10 A to VOUT(S)/50 x 1.25 2 A mV 10 15 24 0.75 - - -0.1 - - - - - 0.3 0.2 V ISH Measured the oscillation at EXT pin Judged the stop of When VOUT 1.5 V oscillation at EXT pin When VOUT < 1.5 V Shutdown pin = VOUT(S) x 0.95 0.1 A ISL Shutdown pin = 0 V -0.1 - 0.1 3.0 - 6.0 86 12.0 - VSH VSL1 VSL2 tSS EFFI CDRH6D28-470 of Sumida Corporation RB461F (Schottky type) of Rohm Co., Ltd. F93 (16 V, 47 F tantalum type) of Nichicon Corporation CPH3210 of Sanyo Electric Co., Ltd. 1.0 k 2200 pF (ceramic type) VIN = VOUT(S) x 0.6 applied, IOUT = VOUT(S)/50 Shutdown function built-in type: ON/OFF pin is connected to VOUT VDD/VOUT separate type: VDD pin is connected to VOUT pin Remarks 1. VOUT(S) specified above is the set output voltage value, and VOUT is the typical value of the output voltage. 2. VDD/VOUT separate type: Step-up operation is performed from VDD = 0.8 V. However, 1.8 VDD 10 V is recommended to stabilize the output voltage and oscillation frequency. (VDD 1.8 V must be applied for products with a set value of less than 1.9 V.) Seiko Instruments Inc. 2 1 0.7 VHLD External parts - Coil: - Diode: - Capacitor: - Transistor : - Base resistor (Rb): - Base capacitor (Cb): 12 VOUT(S) x 1.024 10 0.9 0.8 ms % 1 2 1 2 SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series (2) 250 kHz types (S-835xHxx, S-835xJxx, S-835xLxx) Table 20 Parameter Symbol Conditions Output voltage VOUT Input voltage Operation start voltage Oscillation start voltage Operation holding voltage Current consumption 1 VIN VST1 VST2 IOUT = 1 mA No external parts, voltage applied to VOUT IOUT = 1 mA, Measured by decreasing VIN voltage gradually VOUT = VOUT(S) x 0.95 S-835xx15 to 19 S-835xx20 to 29 S-835xx30 to 39 S-835xx40 to 49 S-835xx50 to 59 S-835xx60 to 65 S-835xx15 to 19 VOUT = VOUT(S) + 0.5 S-835xx20 to 29 S-835xx30 to 39 S-835xx40 to 49 S-835xx50 to 59 S-835xx60 to 65 Current consumption 2 Current consumption during shutdown (with shutdown function) EXT pin output current Line regulation Load regulation Output voltage temperature coefficient Oscillation frequency Max. duty ratio PWM/PFM switching duty ratio (S-8356/58) Shutdown pin input voltage (with shutdown function) Shutdown pin input current (with shutdown function) Soft start time Efficiency Min. VOUT(S) x 0.976 - - - (Unless otherwise specified: Ta = 25C) Test Typ. Max. Unit Circuit VOUT(S) - - - VOUT(S) x 1.024 10 0.9 0.8 V 1 0.7 - - - - - - - - - - - - - - 28.9 42.7 58.0 74.5 92.0 110.5 8.7 8.8 9.0 9.2 9.3 9.5 48.2 71.1 96.7 124.1 153.4 184.2 17.3 17.6 18.0 18.3 18.6 19.0 - - 0.5 -4.5 -6.2 -7.8 -10.3 -13.3 -16.1 -18.9 9.5 12.6 15.5 19.2 23.8 27.4 30.3 - - -8.9 -12.3 -15.7 -20.7 -26.7 -32.3 -37.7 19.0 25.2 31.0 38.5 47.6 54.8 60.6 30 30 - - - - - - - - - - - - - - 60 60 Ta = -40C to +85C - 50 - ppm/C fOSC MaxDuty VOUT = VOUT(S) x 0.95 VOUT = VOUT(S) x 0.95 212.5 70 250 78 287.5 85 kHz % PFMDuty VIN = VOUT(S) - 0.1 V, no load VHLD ISS1 ISS2 ISSS VON/OFF = 0 V IEXTH VEXT = VOUT - 0.4 IEXTL VEXT = 0.4 V VOUT1 VOUT2 V OUT Ta * V OUT S-835xx15 to 19 S-835xx20 to 24 S-835xx25 to 29 S-835xx30 to 39 S-835xx40 to 49 S-835xx50 to 59 S-835xx60 to 65 S-835xx15 to 19 S-835xx20 to 24 S-835xx25 to 29 S-835xx30 to 39 S-835xx40 to 49 S-835xx50 to 59 S-835xx60 to 65 VIN = VOUT(S) x 0.4 to x 0.6 IOUT = 10 A to VOUT(S)/50 x 1.25 2 A mV 10 15 24 0.75 - - - - - - 0.3 0.2 V ISH Shutdown pin = VOUT(S) x 0.95 -0.1 - 0.1 A ISL Shutdown pin = 0 V -0.1 - 0.1 1.5 - 3.0 85 6.0 - tSS EFFI External parts - Coil: - Diode: - Capacitor: - Transistor : - Base resistor (Rb): - Base capacitor (Cb): 1 mA Measured the oscillation at EXT pin Judged the stop of When VOUT 1.5 V oscillation at EXT pin When VOUT < 1.5 V VSH VSL1 VSL2 2 ms % 2 1 2 CDRH6D28-220 of Sumida Corporation RB461F (Schottky type) of Rohm Co., Ltd. F93 (16 V, 47 F tantalum type) of Nichicon Corporation CPH3210 of Sanyo Electric Co., Ltd. 1.0 k 2200 pF (ceramic type) VIN = VOUT(S) x 0.6 applied, IOUT = VOUT(S)/50 Shutdown function built-in type: ON/OFF pin is connected to VOUT VDD/VOUT separate type: VDD pin is connected to VOUT pin Remarks 1. VOUT(S) specified above is the set output voltage value, and VOUT is the typical value of the output voltage. 2. VDD/VOUT separate type: Step-up operation is performed from VDD = 0.8 V. However, 1.8 VDD 10 V is recommended to stabilize the output voltage and oscillation frequency. (VDD 1.8 V must be applied for products with a set value of less than 1.9 V.) Seiko Instruments Inc. 13 SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series (3) 300 kHz types (S-835xFxx, S-835xGxx, S-835xMxx) Table 21 Parameter (Unless otherwise specified: Ta = 25C) Test Typ. Max. Unit Circuit Symbol Conditions Min. Output voltage VOUT VOUT(S) x 0.976 VOUT(S) VOUT(S) x 1.024 Input voltage Operation start voltage Oscillation start voltage Operation holding voltage Current consumption 1 VIN VST1 VST2 - - - - - - 10 0.9 0.8 VHLD IOUT = 1 mA No external parts, voltage applied to VOUT IOUT = 1 mA, Measured by decreasing VIN voltage ISS1 gradually VOUT = VOUT(S) x 0.95 Current consumption 2 ISS2 VOUT = VOUT(S) + 0.5 Current consumption during shutdown ISSS VON/OFF = 0 V IEXTH VEXT = VOUT - 0.4 (with shutdown function) EXT pin output current S-835xx15 to 19 S-835xx20 to 29 S-835xx30 to 39 S-835xx40 to 49 S-835xx50 to 59 S-835xx60 to 65 S-835xx15 to 19 S-835xx20 to 29 S-835xx30 to 39 S-835xx40 to 49 S-835xx50 to 59 S-835xx60 to 65 S-835xx15 to 19 S-835xx20 to 24 S-835xx25 to 29 S-835xx30 to 39 S-835xx40 to 49 IEXTL Line regulation Load regulation Output voltage temperature coefficient Oscillation frequency Max. duty ratio PWM/PFM switching duty ratio (S-8356/58) Shutdown pin input voltage (with shutdown function) Shutdown pin input current (with shutdown function) Soft start time Efficiency VOUT1 VOUT2 V OUT Ta * V OUT S-835xx50 to 59 S-835xx60 to 65 S-835xx15 to 19 S-835xx20 to 24 S-835xx25 to 29 S-835xx30 to 39 S-835xx40 to 49 S-835xx50 to 59 S-835xx60 to 65 VEXT = 0.4 V VIN = VOUT(S) x 0.4 to x 0.6 IOUT = 10 A to VOUT(S)/50 x 1.25 Ta = - 40C to + 85C fOSC MaxDuty VOUT = VOUT(S) x 0.95 VOUT = VOUT(S) x 0.95 PFMDuty VIN = VOUT(S) - 0.1 V, no load 0.7 - - - - - - - - - - - - - - 33.8 50.3 68.6 88.4 109.4 131.6 9.7 9.9 10.0 10.2 10.4 10.5 56.4 83.9 114.4 147.4 182.4 219.3 19.4 19.7 20.0 20.4 20.7 21.0 - - 0.5 -4.5 -6.2 -7.8 -10.3 -13.3 -8.9 -12.3 -15.7 -20.7 -26.7 - - - - - -16.1 -18.9 9.5 12.6 15.5 19.2 23.8 27.4 30.3 - - -32.3 -37.7 19.0 25.2 31.0 38.5 47.6 54.8 60.6 30 30 - - - - - - - - - 60 60 - 50 - ppm/C 255 70 300 78 345 85 kHz % 2 A mV 15 24 ISH When VOUT 1.5 V When VOUT < 1.5 V Shutdown pin = VOUT(S) x 0.95 - 0.3 0.2 V Judged the stop of oscillation at EXT pin - - - - 0.1 A ISL Shutdown pin = 0 V -0.1 - 0.1 1.5 - 3.0 85 6.0 - tSS EFFI CDRH6D28-220 of Sumida Corporation RB461F (Schottky type) of Rohm Co., Ltd. F93 (16 V, 47 F tantalum type) of Nichicon Corporation CPH3210 of Sanyo Electric Co., Ltd. 1.0 k 2200 pF (ceramic type) VIN = VOUT(S) x 0.6 applied, IOUT = VOUT(S)/50 Shutdown function built-in type: ON/OFF pin is connected to VOUT VDD/VOUT separate type: VDD pin is connected to VOUT pin Remarks 1. VOUT(S) specified above is the set output voltage value, and VOUT is the typical value of the output voltage. 2. VDD/VOUT separate type: Step-up operation is performed from VDD = 0.8 V. However, 1.8 VDD 10 V is recommended to stabilize the output voltage and oscillation frequency. (VDD 1.8 V must be applied for products with a set value of less than 1.9 V.) Seiko Instruments Inc. 1 mA 10 Measured the oscillation at EXT pin 2 1 0.75 - - -0.1 VSH VSL1 VSL2 External parts - Coil: - Diode: - Capacitor: - Transistor : - Base resistor (Rb): - Base capacitor (Cb): 14 V ms % 2 1 2 SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series (4) 600 kHz types (S-835xNxx) Table 22 Parameter (Unless otherwise specified: Ta = 25C) Test Typ. Max. Unit Circuit Symbol Conditions Min. Output voltage VOUT VOUT(S) x 0.976 VOUT(S) VOUT(S) x 1.024 Input voltage Operation start voltage Oscillation start voltage Operation holding voltage Current consumption 1 VIN VST1 VST2 - - - - - - 10 0.9 0.8 Current consumption 2 IOUT = 1 mA No external parts, voltage applied to VOUT IOUT = 1 mA, Measured by decreasing VIN voltage 0.7 - - - - - - - - - - - - - - 63.6 96.4 132.8 172.2 214.0 240.2 15.9 16.1 16.2 16.4 16.6 16.7 105.9 160.6 221.3 286.9 356.7 400.3 31.8 32.1 32.4 32.8 33.1 33.3 - - 0.5 S-835xx15 to 19 S-835xx20 to 24 S-835xx25 to 29 S-835xx30 to 39 -4.5 -6.2 -7.8 -10.3 -13.3 -8.9 -12.3 -15.7 -20.7 -26.7 - - - - - -16.1 -18.9 9.5 12.6 15.5 19.2 23.8 27.4 30.3 - - -32.3 -37.7 19.0 25.2 31.0 38.5 47.6 54.8 60.6 30 30 - - - - - - - - - 60 60 Ta = -40C to +85C - 50 - ppm/C fOSC MaxDuty VOUT = VOUT(S) x 0.95 VOUT = VOUT(S) x 0.95 510 65 600 78 690 85 kHz % PFMDuty VIN = VOUT(S) - 0.1 V, no load 10 15 24 0.75 - - -0.1 -0.1 1.5 - - - - - - 3.0 85 - 0.3 0.2 0.1 0.1 6.0 - ISS1 gradually VOUT = VOUT(S) x 0.95 ISS2 VOUT = VOUT(S) + 0.5 ISSS VON/OFF = 0 V EXT pin output current IEXTH VEXT = VOUT - 0.4 IEXTL Output voltage temperature coefficient Oscillation frequency Max. duty ratio PWM/PFM switching duty ratio (S-8356/58) Shutdown pin input voltage Shutdown pin input current Soft start time Efficiency VOUT1 VOUT2 V OUT Ta * V OUT VSH VSL1 VSL2 ISH ISL tSS EFFI External parts - Coil: - Diode: - Capacitor: - Transistor: - Base resistor (Rb): - Base capacitor (Cb): S-835xx40 to 49 S-835xx50 to 59 S-835xx60 to 65 S-835xx15 to 19 S-835xx20 to 24 S-835xx25 to 29 S-835xx30 to 39 S-835xx40 to 49 S-835xx50 to 59 S-835xx60 to 65 VEXT = 0.4 V VIN = VOUT(S) x 0.4 to x 0.6 IOUT = 10 A to VOUT(S)/50 x 1.25 Measured the oscillation at EXT pin When VOUT 1.5 V Judged the stop of oscillation at EXT pin When VOUT < 1.5 V Shutdown pin = VOUT(S) x 0.95 Shutdown pin = 0 V 2 1 S-835xx15 to 19 S-835xx20 to 29 S-835xx30 to 39 S-835xx40 to 49 S-835xx50 to 59 S-835xx60 to 65 S-835xx15 to 19 S-835xx20 to 29 S-835xx30 to 39 S-835xx40 to 49 S-835xx50 to 59 S-835xx60 to 65 VHLD Current consumption during shutdown Line regulation Load regulation V 2 A 1 mA mV 2 1 V A ms % 2 CDRH6D28-100 of Sumida Corporation RB461F (Schottky type) of Rohm Co., Ltd. F93 (16 V, 47 F tantalum type) of Nichicon Corporation CPH3210 of Sanyo Electric Co., Ltd. 1.0 k 2200 pF (ceramic type) VIN = VOUT(S) x 0.6 applied, IOUT = VOUT(S)/50 , ON/OFF = VOUT Remark VOUT(S) specified above is the set output voltage value, and VOUT is the typical value of the output voltage. Seiko Instruments Inc. 15 SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series (5) 600 kHz types (S-835xPxx, S-835xQxx) Table 23 Parameter (Unless otherwise specified: Ta = 25C) Test Typ. Max. Unit Circuit Symbol Conditions Min. Output voltage VOUT VOUT(S) x 0.976 VOUT(S) VOUT(S) x 1.024 Input voltage Operation start voltage Oscillation start voltage Operation holding voltage Current consumption 1 Current consumption 2 Current consumption during shutdown (with shutdown function) EXT pin output current VIN VST1 VST2 - - - - - - 10 0.9 0.8 Line regulation Load regulation Output voltage temperature coefficient Oscillation frequency Max. duty ratio PWM/PFM switching duty ratio (S-8356/58) Shutdown pin input voltage (with shutdown function) Shutdown pin input current (with shutdown function) Soft start time Efficiency VHLD IOUT = 1 mA No external parts, voltage applied to VDD IOUT = 1 mA, Measured by decreasing VIN voltage ISS1 ISS2 gradually VDD = 3.3 V VDD = 3.3 V ISSS VON/OFF = 0 V IEXTH IEXTL VOUT1 VOUT2 V OUT Ta * V OUT VDD = 3.3 V VDD = 3.3 V VIN = VOUT(S) x 0.4 to x 0.6 IOUT = 10 A to VOUT(S)/50 x 1.25 Ta = -40C to +85C fOSC MaxDuty VDD = 3.3 V VDD = 3.3 V PFMDuty VIN = VOUT(S) - 0.1 V, no load 0.7 - - - - 132.8 16.2 221.3 32.4 - - 0.5 -10.3 19.2 - - -20.7 38.5 30 30 - - 60 60 - 50 - ppm/C 510 65 600 78 690 85 kHz % 4 A mV 15 24 - 0.3 0.2 V ISH When VOUT 1.5 V When VOUT < 1.5 V Shutdown pin = VOUT(S) x 0.95 - - - -0.1 - 0.1 A ISL Shutdown pin = 0 V -0.1 - 0.1 1.5 - 3.0 85 6.0 - tSS EFFI Judged the stop of oscillation at EXT pin CDRH6D28-100 of Sumida Corporation RB461F(Schottky type) of Rohm Co., Ltd. F93 (16 V, 47 F tantalum type) of Nichicon Corporation CPH3210 of Sanyo Electric Co., Ltd. 1.0 k 2200 pF (ceramic type) VIN = VOUT(S) x 0.6 applied, IOUT = VOUT(S)/50 , ON/OFF = 3.3 V Remarks 1. VOUT(S) specified above is the set output voltage value, and VOUT is the typical value of the output voltage. 2. VDD/VOUT separate type: Step-up operation is performed from VDD = 0.8 V. However, 1.8 VDD 10 V is recommended to stabilize the output voltage and oscillation frequency. (VDD 1.8 V must be applied for products with a set value of less than 1.9 V.) Seiko Instruments Inc. 3 mA 10 Measured the oscillation at EXT pin 4 3 0.75 - - VSH VSL1 VSL2 External parts - Coil: - Diode: - Capacitor: - Transistor: - Base resistor (Rb): - Base capacitor (Cb): 16 V ms % 4 3 4 SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series Test Circuits 1. EXT Oscilloscope (ON/OFF) A VOUT (VDD) VSS + - 0.1 F Figure 9 2. Cb Rb + EXT - + VOUT (VDD) V - (ON/OFF) VSS 0.1 F Figure 10 3. EXT Oscilloscope (ON/OFF) VOUT (VDD) A + VSS - 0.1 F Figure 11 4. Cb Rb + EXT - + VOUT (VDD) - V (ON/OFF) VSS 0.1 F Figure 12 Seiko Instruments Inc. 17 SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series Operation 1. Switching control types 1-1. PWM control (S-8355/57 Series) The S-8355/57 Series is a DC-DC converter using a pulse width modulation method (PWM) and features a low current consumption. In conventional PFM DC-DC converters, pulses are skipped when the output load current is low, causing a fluctuation in the ripple frequency of the output voltage, resulting in an increase in the ripple voltage. In S-8355/57 Series, the switching frequency does not change, although the pulse width changes from 0% to 83% (78% for F, G, H, J, L, M, N, P, Q types) corresponding to each load current. The ripple voltage generated from switching can thus be removed easily through a filter because the switching frequency is constant. 1-2. PWM/PFM switching control (S-8356/58 Series) S-8356/58 Series is a DC-DC converter that automatically switches between a pulse width modulation method (PWM) and a pulse frequency modulation method (PFM), depending on the load current, and features a low current consumption. This series is a particularly highly efficient DC-DC converter at an output current of around 100 A. In conventional constant-duty PFM DC-DC converters, pulses are skipped when the output load current is low, causing a fluctuation in the ripple frequency of the output voltage, resulting in an increase in the ripple voltage. The S-8356/58 Series operates under PWM control with the pulse width duty changing from 15% to 83% (78% for F, G, H, J, L, M, N, P, Q types) in a high output load current area. On the other hand, the S-8356/58 Series operates under PFM control with the pulse width duty fixed at 15% in a low output load current area, and pulses are skipped when the low output load current is low according to the load current and output to the switching transistor. The oscillation circuit thus oscillates intermittently so that the resultant lower self-consumption can prevent a reduction in the efficiency at a low load current. The switching point from PWM control to PFM control depends on the external devices (coil, diode, etc.), input voltage and output voltage. 2. Soft start function For this IC, the built-in soft start circuit controls the rush current and overshoot of the output voltage when powering on or when the ON/OFF pin is switched to the "H" level. 18 Seiko Instruments Inc. SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series 3. Shutdown pin (Only for SOT-23-5 package products of B, H, F, K, L, M, N, and Q types and for 6-Pin SNB(B) package products.) Stops or starts step-up operation. Switching the shutdown pin to the "L" level stops operation of all the internal circuits and reduces the current consumption significantly. DO NOT use the shutdown pin in a floating state because it has the structure shown in Figure 13 and is not pulled up or pulled down internally. DO NOT apply voltage of between 0.3 V and 0.75 V to the shutdown pin because applying such a voltage increases the current consumption. If the shutdown pin is not used, connect it to the VOUT (VDD for K, L, M, Q types) pin. The shutdown pin does not have hysteresis. Table 24 Shutdown Pin CR Oscillation Circuit Output Voltage "H" Operation Fixed "L" Stop VIN *1 *1. Voltage obtained by subtracting the voltage drop due to DC resistance of the inductor and the diode forward voltage from VIN. (VDD for K, L , M, Q types) VOUT ON/OFF V VSS Figure 13 Shutdown Pin Structure Seiko Instruments Inc. 19 SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series 4. Operation The following are basic equations [(1) through (7)] of the step-up switching regulator (refer to Figure 14). L D CONT VIN VOUT M1 + EXT - CL VSS Figure 14 Step-up Switching Regulator Circuit for Basic Equations Voltage at the CONT pin at the moment M1 is turned ON (current IL flowing through L is zero), VA: *1 VA = VS ........................................................................................... (1) *1. VS: Non-saturated voltage of M1 Change in IL over time: dIL dt VL L = VIN - VS L = ........................................................... (2) Integration of the above equation : VIN - VS L IL = * t ....................................................................... (3) IL flows while M1 is ON (tON). The time of tON is determined by the oscillation frequency of OSC. Peak current (IPK) after tON: VIN - VS IPK = * tON .................................................................. (4) L 2 The energy stored in L is represented by 1 * * L (IPK) . 2 When M1 is turned OFF (tOFF), the energy stored in L is transmitted through a diode to the output capacitor. Then, reverse voltage (VL) is generated: VL = (VOUT + VD ) - VIN ....................................................................... (5) *2 *2. VD: Diode forward voltage The voltage at the CONT pin rises only by VOUT + VD. Change in the current (IL) flowing through the diode into VOUT during tOFF: dIL dt = VL L = VOUT + VD - VIN L ...................................................... (6) Integration of the above equation is as follows: IL = IPK - 20 VOUT + VD - VIN L * t ..................................................... (7) Seiko Instruments Inc. SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series During tON, the energy is stored in L and is not transmitted to VOUT. When receiving output current (IOUT) from VOUT, the energy of the capacitor (CL) is consumed. As a result, the pin voltage of CL is reduced, and goes to the lowest level after M1 is turned ON (tON). When M1 is turned OFF, the energy stored in L is transmitted through the diode to CL, and the voltage of CL rises drastically. VOUT is a time function indicating the maximum value (ripple voltage: VP-P) when the current flowing through into VOUT and load current (IOUT) match. Next, the ripple voltage is determined as follows: IOUT vs t1 (time) from when M1 is turned OFF (after tON) to when VOUT reaches the maximum level: VOUT + VD - VIN L IOUT = IPK - * t1 .................................................................................. (8) L VOUT + VD - VIN t1 = (IPK - IOUT) * .................................................................................. (9) When M1 is turned ON (after tOFF), IL = 0 (when the energy of the inductor is completely transmitted): Based on equation (7), L VOUT + VD - VIN = tOFF IPK ............................................................................................(10) When substituting equation (10) for equation (9), t1 = tOFF - IOUT * tOFF ................................................................................................... (11) IPK Electric charge Q1 which is charged in CL during t1 : VOUT + VD - VIN VOUT + VD - VIN t1 t Q1 = 01 ILdt = IPK * t1 dt - * tdt = IPK * t1 - 0 0 L L * 1 2 2 t1 ........... (12) When substituting equation (12) for equation (9): Q1 = IPK - 1 2 (IPK - IOUT) * t1 = IPK + IOUT * t1 .............................................................. (13) 2 A rise in voltage (VP-P) due to Q 1: VP-P = Q1 CL = 1 CL * IPK + IOUT 2 * t1 .................................................................... (14) *1 When taking into consideration IOUT to be consumed during t1 and ESR of CL: VP-P = Q1 CL = 1 CL * IPK + IOUT 2 * t1 + IPK + IOUT 2 * RESR - IOUT * t1 CL ............... (15) *1. Equivalent Series Resistance Seiko Instruments Inc. 21 SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series When substituting equation (11) for equation (15): VP-P = (IPK - IOUT) 2IPK 2 * tOFF CL + IPK + IOUT 2 * RESR .................................................. (16) Therefore to reduce the ripple voltage, it is important that the capacitor connected to the output pin has a large capacity and a small ESR. 22 Seiko Instruments Inc. SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series External Parts Selection The relationship between the major characteristics of the step-up circuit and the characteristics parameters of the external parts are shown in Figure 15. For higher efficiency? For larger output current? For smaller ripple voltage? Operation efficiency Stand-by efficiency Smaller inductance Larger inductance Smaller DC resistance of inductor Larger output capacitance Larger output capacitance With MOS FET, smaller ON resistance With MOS FET, smaller input capacitance With bipolar transistor, smaller external resistance Rb With bipolar transistor, larger external resistance Rb Figure 15 Relationship Between Major Characteristics of Step-up Circuit and External Parts Seiko Instruments Inc. 23 SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series 1. Inductor The inductance has a strong influence on the maximum output current IOUT and efficiency . Figure 16 shows the relationship between the IOUT and dependency on L of S-8355/56/57/58. F, G, H, J, L, M Type CDRH6D28 VOUT = 5.0 V, VIN = 3.0 V IOUT Efficiency decreases Efficiency decreases IOUT decreases IOUT decreases IPK increases IPK decreases Coil size: smaller Coil size: bigger Recommended range 4.7 L (H) 47 Figure 16 L-IOUT and Characteristics The peak current (IPK) increases by decreasing L and the stability of the circuit improves and IOUT increases. If L is decreased further, the efficiency falls and if the current drive capability is insufficient, IOUT decreases. (Based on the current drive capability of external switching transistor.) The loss of IPK by the switching transistor decreases by increasing L and the efficiency becomes maximum at a certain L value. Further increasing L decreases the efficiency due to the loss of the DC resistance of the coil. IOUT also decreases. If the oscillation frequency is higher, a smaller L value can be chosen, making the coil smaller. The recommended inductances are a 22 to 100 H inductor for B, E, and K types, a 4.7 to 47 H inductor for F, G, H, J, L, and M types, 3.0 to 22 H inductor for N, P, Q, types. Choose an inductor so that IPK does not exceed the allowable current. Exceeding the allowable current of the inductor causes magnetic saturation, much lower efficiency and destruction of the IC chip due to a large current. IPK in discontinuous mode is calculated by the following equation: IPK = 2 IOUT (VOUT + VD - VIN) fOSC * L (A) ..............................(17) fOSC = Oscillation frequency, VD 0.4 V. 2. Diode Use an external diode that meets the following requirements: * Low forward voltage: (VF < 0.3 V) * High switching speed: (50 ns max.) * Reverse voltage: VOUT + VF or more * Rated current: IPK or more 24 Seiko Instruments Inc. SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series 3. Capacitor (CIN, CL) A capacitor on the input side (CIN) improves the efficiency by reducing the power impedance and stabilizing the input current. Select a CIN value according to the impedance of the power supply used. A capacitor on the output side (CL) is used for smoothing the output voltage. For step-up types, the output voltage flows intermittently to the load current, so step-up types need a larger capacitance than step-down types. Therefore, select an appropriate capacitor in accordance with the ripple voltage, which increases in case of a higher output voltage or a higher load current. The capacitor value should be 10 F minimum. Select an appropriate capacitor taking into consideration the ESR (Equivalent Series Resistance) for stable output voltage. A stable voltage range in this IC depends on the ESR. Although the inductance (L) is also a factor, an ESR of 30 m to 500 m draws out the characteristics. However, the best ESR may depend on L, the capacitance, the wiring and the application (output load). Therefore, fully evaluate the ESR under actual conditions to determine the best value. "2 Ceramic capacitor" of "Application Circuits" shows an example of a circuit that uses a ceramic capacitor and external resistance (ESR) for reference. 4. External transistor A bipolar (NPN) transistor or an enhancement (N-channel) MOS FET transistor can be used as the external transistor. 4.1 Bipolar (NPN) transistor A circuit example using the CPH3210 (hFE = 200 to 560) from Sanyo Electric Co., Ltd. as the bipolar transistor (NPN) is shown in Figure 19 of "Standard Circuits". The hFE value and the Rb value determine the driving capacity when the output current is increased using a bipolar transistor. A peripheral circuit example of the transistor is shown in Figure 17. VOUT (VDD for E, G, J, K, L, M, P, Q types) Cb 2200 pF IPK Pch Rb EXT 1 k Nch Figure 17 External Transistor Peripheral 1 k is recommended for Rb. Rb is determined by the following calculation. Calculate the necessary base current (Ib) from the bipolar transistor hFE using Ib = IPK hFE. 0.4 - 0.7 V V DD - 0.7 0.4 Rb = OUT ( Rb = for E, G, J, K, L, M, P, and Q types) | IEXTH | Ib Ib | IEXTH | A small Rb increases the output current, but the efficiency decreases. The current flows pulsating and there is a voltage drop due to wiring resistance in the actual circuit, therefore the optimum Rb value should be determined by experiment. A speed-up capacitor (Cb) connected in parallel with the Rb resistance as shown in Figure 17 decreases the switching loss and improves the efficiency. Cb is calculated from the following equation: 1 Cb 2 * Rb * fOSC * 0.7 However, in practice, the optimum Cb value also varies depending on the characteristics of the bipolar transistor employed. Therefore, determine the optimum value by experiment. 25 Seiko Instruments Inc. SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series 4.2 Enhancement MOS FET type Figure 18 is a circuit example using a MOS FET transistor (N-channel). An N-channel power MOS FET should be used for the MOS FET. Because the gate voltage and current of the external power MOS FET are supplied from the stepped-up output voltage VOUT, the MOS FET is driven more effectively. Depending on the MOS FET you use in your device, there is a chance of a current overrun at power ON. Thoroughly test all settings with your device before deciding on which one to use. Also, try to use a MOS FET with an input capacitance of 700 pF or less. Since the ON resistor of the MOS FET might depend on the difference between the output voltage VOUT and the threshold voltage of the MOS FET, and affect the output current as well as the efficiency, the threshold voltage should be low. When the output voltage is low, the circuit operates only when the MOS FET has a threshold voltage lower than the output voltage. VOUT + - + - EXT (VDD) (ON / OFF) VSS VOUT Figure 18 Circuit Example Using MOS FET 26 Seiko Instruments Inc. SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series 5. VDD/VOUT separate types (E, G, J, K, L, M, P, and Q types) The E, G, J, K, L, M, P, and Q types are ideal for the following applications because the power pin for the IC chip and the VOUT pin for the output voltage are separated: (1) When changing the output voltage by external resistance. (2) When outputting a high voltage such as +15 V or + 20 V. Choose the products in Table 25 according to applications (1) and (2) above. Output Voltage VCC S-835xx18 S-835xx50 Connection to VDD pin 1.8 V VCC < 5 V Yes VIN or VCC Table 25 5 V VCC Yes Yes VIN Reference Circuit Application circuit 1 (Figure 26) Application circuit 1 (Figure 26) Cautions 1. This IC starts a step-up operation at VDD = 0.8 V, but set 1.8 VDD 10 V to stabilize the output voltage and frequency of the oscillator. (Input a voltage of 1.8 V or more at the VDD pin for all products with a setting less than 1.9 V.) An input voltage of 1.8 V or more at the VDD pin allows connection of the VDD pin to either the input power pin VIN or output power pin VOUT. 2. Choose external resistors RA and RB so as to not affect the output voltage, considering that there is impedance between the VOUT and VSS pins in the IC chip. The internal resistance between the VOUT and VSS pins is as follows: (1) S-835xx18 2.1 M to 14.8 M (2) S-835xx20 1.4 M to 14.8 M (2) S-835xx30 1.4 M to 14.2 M (3) S-835xx50 1.4 M to 12.1 M 3. Attach a capacitor (CC) in parallel to the RA resistance when an unstable event such as oscillation of the output voltage occurs. Calculate CC using the following equation: CC(F) = 1 2 * * RA * 20 kHz Seiko Instruments Inc. 27 SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series Standard Circuits (1) S-8357BxxMA, S-8357BxxUA, S-8358BxxMA, S-8358BxxUA SD VOUT L Oscillation circuit IC internal power supply 2200 pF VIN EXT + - PWM or PWM /PFM switching control circuit 1 k CIN - CL - Phase compensation circuit Soft start built-in reference power supply + + VSS Remark The power supply for the IC chip is from the VOUT pin. Figure 19 (2) S-8357BxxMC, S-8357FxxMC/BD, S-8357HxxMC/BD, S-8357NxxMC/BD S-8358BxxMC, S-8358FxxMC/BD, S-8358HxxMC/BD, S-8358NxxMC/BD SD VOUT L Oscillation circuit IC internal power supply 2200 pF VIN + - CIN EXT PWM or PWM /PFM switching control circuit 1 k - CL - Phase compensation circuit Soft start built-in reference power supply + + VSS Remark The power supply for the IC chip is from the VOUT pin. ON/OFF Figure 20 (3) S-8357ExxMC, S-8357GxxMC/BD, S-8357JxxMC/BD, S-8357PxxMC/BD S-8358ExxMC, S-8358GxxMC/BD, S-8358JxxMC/BD, S-8358PxxMC/BD SD VDD L Oscillation circuit 2200 pF VIN + - CIN EXT 1 k PWM or PWM /PFM switching control circuit Soft start built-in reference power supply CC IC internal power supply RA VOUT RB + Phase compensation circuit Remark The power supply for the IC chip is from the VDD pin. VSS 28 Figure 21 Seiko Instruments Inc. + - CL - SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series (4) S-8357ExxMC, S-8357GxxMC/BD, S-8357JxxMC/BD S-8358ExxMC, S-8358GxxMC/BD, S-8358JxxMC/BD SD VOUT VDD L IC internal power supply Oscillation circuit 2200 pF VIN + - CIN PWM or PWM /PFM switching control circuit EXT 1 k Soft start built-in reference power supply + + - - CL Phase compensation circuit Remark The power supply for the IC VSS chip is from the VDD pin. Figure 22 (5) S-8355KxxMC/BD, S-8355LxxMC/BD, S-8355MxxMC/BD, S-8355QxxMC/BD S-8356KxxMC/BD, S-8356LxxMC/BD, S-8356MxxMC/BD, S-8356QxxMC/BD SD VDD L IC internal power supply Oscillation circuit 2200 pF VIN + PWM or PWM /PFM switching control circuit EXT - 1 k CIN Soft start built-in reference power supply CC RA RB + + - CL - Phase compensation circuit VSS Remark The power supply for the IC chip is from the VDD pin. ON/OFF Figure 23 (6) S-8355KxxMC/BD, S-8355LxxMC/BD, S-8355MxxMC/BD S-8356KxxMC/BD, S-8356LxxMC/BD, S-8356MxxMC/BD Oscillation circuit 2200 pF VIN + - CIN VOUT VDD L EXT PWM or PWM /PFM switching control circuit 1 k Soft start built-in reference power supply IC internal power supply + + - CL - Phase compensation circuit VSS Remark The power supply for the IC chip is from the VDD pin. ON/OFF Figure 24 Seiko Instruments Inc. 29 SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series Power Dissipation of Package 600 SOT-89-3 SOT-23-5 Power 400 Dissipation SOT-23-3 PD (mW) 6-Pin SNB(B) 200 0 0 50 100 150 Ambient Temperature Ta (C) Figure 25 Power Dissipation of Package (Before Mounting) Precautions * Mount external capacitors, the diode, and the coil as close as possible to the IC. * Characteristics ripple voltage and spike noise occur in IC containing switching regulators. Moreover rush current flows at the time of a power supply injection. Because these largely depend on the coil, the capacitor and impedance of power supply used, fully check them using an actually mounted model. * Make sure that the dissipation of the switching transistor (especially at a high temperature) does not exceed the allowable power dissipation of the package. * The performance of this IC varies depending on the design of the PCB patterns, peripheral circuits and external parts. Thoroughly test all settings with your device. Also, try to use the recommended external parts. If not, contact an SII sales person. * Do not apply an electrostatic discharge to this IC that exceeds the performance ratings of the built-in electrostatic protection circuit. * SII claims no responsibility for any disputes arising out of or in connection with any infringement by products including this IC of patents owned by a third party. 30 Seiko Instruments Inc. SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series Application Circuits 1. LCD Power Supply The following example is an application power supply circuit (15 V/20 V output) to drive an LCD panel, and its characteristics. SD L VOUT VIN CIN + CL CC + RA - - VDD VOUT ON/OFF S-8356M50 S-8356Q50 TR EXT RB VSS Figure 26 Power Supply Circuit for LCD Table 26 Output Voltage IC L Type Name TR Type Name SD Type Name CL Ra Rb Cc Output Characteristics (1) 15 V S-8356M50 CDRH5D18-220 MCH3405 MA2Z748 F93 (20 V,10 F) 580 k 300 k 15 pF (1-a),(1-b) (2) 20 V S-8356M50 CDRH5D18-220 FDN337N F93 (25 V,10 F) 575 k 200 k 15 pF (2-a),(2-b) (3) 10 V S-8356Q50 CDRH5D18-100 MCH3405 MA2Z748 F93 (20 V,10 F) 560 k 560 k 15 pF (3-a),(3-b) MA729 Seiko Instruments Inc. 31 SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series (1-a) Output current (IOUT) vs. Efficiency () (1-b) Output current (IOUT) vs. Output voltage (VOUT) 100 16 15 VOUT [V] [%] 80 60 40 VIN=3.0 V VIN=5.0 V VIN=7.0 V 20 0 0.01 0.1 1 IOUT [mA] 10 12 0.01 100 VOUT [V] [%] 1 IOUT [mA] 60 40 VIN=3.0 V VIN=5.0 V VIN=7.0 V 20 0 100 0.1 1 IOUT [mA] 10 20 18 VIN=3.0 V VIN=5.0 V VIN=7.0 V 16 14 0.01 100 (3-a) Output current (IOUT) vs. Efficiency () 0.1 1 IOUT [mA] 10 100 (3-b) Output current (IOUT) vs. Output voltage (VOUT) 100 11 VOUT [V] 80 60 40 0 0.1 1 IOUT [mA] 10 10 9 8 VIN=3.3 V VIN=5.0 V 20 100 7 0.01 VIN=3.3 V VIN=5.0 V 0.1 1 IOUT [mA] Figure 27 LCD Power Supply Output Characteristics 32 10 22 80 [%] 0.1 (2-b) Output current (IOUT) vs. Output voltage (VOUT) 100 0.01 VIN=3.0 V VIN=5.0 V VIN=7.0 V 13 (2-a) Output current (IOUT) vs. Efficiency () 0.01 14 Seiko Instruments Inc. 10 100 SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series 2. Ceramic Capacitor (Application Example) If using small ESR parts such as ceramic capacitors for the output capacitance, attach a resistor (R1) corresponding to the ESR in series to the ceramic capacitor (CL) as shown in the following circuit. R1 may depend on L, the capacitance, the wiring, and the application (output load). The following example is a circuit using R1 = 100 m, output voltage = 3.3 V, output load = 500 mA and its characteristics. L VIN SD VOUT CIN EXT TR R1 VOUT CL VSS Figure 28 Circuit Using Ceramic Capacitor Table 27 SD Type Name CL (Ceramic Capacitor) S-8357F33 CDRH6D28-220 FDN335N M1FH3 10 F x 2 100 m (1-a), (1-b), (1-c) (2) S-8358B50 CDRH6D28-470 FDN335N M1FH3 10 F x 2 100 m (2-a), (2-b), (2-c) (3) S-8357N33 CDRH6D28-100 FDN335N M1FH3 10 F x 2 100 m (3-a), (3-b), (3-c) IC (1) L Type Name TR Type Name Seiko Instruments Inc. R1 Output Characteristics 33 SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series (1-b) Output current (IOUT) vs. Output voltage (VOUT) (1-a) Output current (IOUT) vs. Efficiency () 100 3.32 80 VOUT [V] 3.31 [%] 60 40 VIN=0.9 V VIN=1.8 V VIN=2.7 V 20 0.1 1 10 100 VIN=0.9 V VIN=1.8 V VIN=2.7 V 3.29 3.28 0.01 0 0.01 3.30 1000 0.1 1 10 100 1000 IOUT [mA] IOUT [mA] (1-c) Output current (IOUT) vs. Ripple voltage (Vr) 100 Vr [mV] 80 60 VIN=0.9 V VIN=1.8 V VIN=2.7 V 40 20 0 0.01 0.1 1 10 100 1000 IOUT [mA] (2-b) Output current (IOUT) vs. Output voltage (VOUT) (2-a) Output current (IOUT) vs. Efficiency () 80 5.06 VOUT [V] 5.07 [%] 100 60 5.05 40 VIN=2.0 V VIN=3.0 V VIN=4.0 V 20 0 0.01 0.1 1 10 100 5.04 1000 5.03 0.01 IOUT [mA] (2-c) Output current (IOUT) vs. Ripple voltage (Vr) 100 Vr [mV] 80 60 VIN=2.0 V VIN=3.0 V VIN=4.0 V 40 20 0 0.01 0.1 1 10 100 1000 IOUT [mA] 34 Seiko Instruments Inc. VIN=2.0 V VIN=3.0 V VIN=4.0 V 0.1 1 10 IOUT [mA] 100 1000 SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series (3-b) Output current (IOUT) vs. Output voltage (VOUT) (3-a) Output current (IOUT) vs. Efficiency () 80 3.31 VOUT [V] 3.32 [%] 100 60 40 VIN=0.9 V VIN=1.8 V VIN=2.7 V 20 0 0.01 0.1 1 10 100 3.30 VIN=0.9 V VIN=1.8 V VIN=2.7 V 3.29 3.28 1000 0.01 0.1 1 10 IOUT [mA] 100 1000 IOUT [mA] (3-c) Output current (IOUT) vs. Ripple voltage (Vr) 100 Vr [mV] 80 60 VIN=0.9 V VIN=1.8 V VIN=2.7 V 40 20 0 0.01 0.1 1 10 100 1000 IOUT [mA] Figure 29 Ceramic Capacitor Circuit Output Characteristics Seiko Instruments Inc. 35 SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series Example of Major Temperature Characteristics (Ta = -40 to 85C) ISS1 vs. Ta (VOUT= 3.3 V, fosc= 100 kHz) ISS1 ISS1 vs. Ta (VOUT= 3.3 V, fosc= 300 kHz) 50 50 40 40 30 ISS1 30 [A] 20 [A] 20 10 10 0 -40 -20 0 20 40 Ta [C] 60 80 0 -40 100 -20 0 20 40 Ta [C] 60 80 100 ISS1 vs. Ta (VOUT= 3.3 V, fosc= 600 kHz) 100 80 ISS1 60 [A] 40 20 0 -40 10 -20 0 20 40 Ta [C] 60 80 100 ISS2 vs. Ta (VOUT= 3.3 V, fosc= 100 kHz) 10 8 8 ISS2 [A] ISS2 6 [A] 4 10 6 4 2 2 0 -40 -20 0 20 40 Ta [C] 60 80 100 0 -40 ISS2 vs. Ta (VOUT= 3.3 V, fosc= 600 kHz) 8 ISS2 [A] 6 4 2 0 -40 36 ISS2 vs. Ta (VOUT= 3.3 V, fosc= 300 kHz) -20 0 20 40 Ta [C] 60 80 100 Seiko Instruments Inc. -20 0 20 40 Ta [C] 60 80 100 SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series ISSS vs. Ta (VOUT= 3.3 V, fosc= 100 kHz) 1.0 0.8 0.8 ISSS 0.6 ISSS 0.6 [A] [A] 0.4 0.4 0.2 0.2 0.0 0.0 -40 -60 -20 0 20 40 Ta [C] 60 80 -40 100 IEXTH vs. Ta (VOUT= 3.3 V,fosc= 300 kHz) 60 -50 IEXTH [mA] -40 [mA] 20 -10 10 -20 0 20 40 Ta [C] 60 80 fosc vs. Ta (VOUT= 3.3 V, fosc= 100 kHz) 400 fosc [kHz] 100 -20 0 20 40 Ta [C] 60 80 100 f osc vs. Ta (VOUT= 3.3 V, fosc= 300 kHz) 300 250 75 800 80 350 100 50 -40 60 I EXTL vs. Ta (VOUT= 3.3 V,fosc= 300 kHz) 0 -40 100 125 [kHz] 20 40 Ta [C] 30 -20 150 0 40 IEXTL -30 -40 -20 50 0- fosc ISSS vs. Ta (VOUT= 3.3 V, fosc= 300 kHz) 1.0 -20 0 20 40 Ta [C] 60 80 100 200 -40 -20 0 20 40 Ta [C] 60 80 100 f osc vs. Ta (VOUT= 3.3 V, fosc= 600 kHz) 700 fosc [kHz] 600 500 400 -40 -20 0 20 40 Ta [C] 60 80 100 Seiko Instruments Inc. 37 SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series 90 MaxDuty vs. Ta (VOUT= 3.3 V, fosc= 100 kHz) 90 85 85 MaxDuty 80 [%] MaxDuty 80 [%] 75 75 70 -40 90 -20 0 20 40 Ta [C] 60 80 MaxDuty vs. Ta (VOUT= 3.3 V, fosc= 300 kHz) 70 -40 100 -20 0 20 40 Ta [C] 60 80 100 MaxDuty vs. Ta (VOUT= 3.3 V, fosc= 600 kHz) 85 MaxDuty 80 [%] 75 70 -40 -20 0 20 40 Ta [C] 60 80 100 VSH vs. Ta (VOUT= 3.3 V, fosc= 300 kHz) PFMDuty vs. Ta (VOUT= 3.3 V, fosc= 100 kHz) S-8356/58 Series 25 1.0 0.8 20 PFMDuty 15 [%] VSH 0.6 [V] 10 0.2 5 -40 0.0 -20 0 20 40 Ta [C] 60 80 -40 100 VSL1 vs. Ta (VOUT= 3.3 V, fosc= 300 kHz) 1.0 -20 0 20 40 Ta [C] 60 80 100 VSL2 vs. Ta (VOUT= 1.4 V, fosc= 300 kHz) 1.0 0.8 0.8 VSL1 0.6 VSL2 [V] [V] 0.4 0.2 0.6 0.4 0.2 0.0 0.0 -40 38 0.4 -20 0 20 40 Ta [C] 60 80 100 -40 Seiko Instruments Inc. -20 0 20 40 Ta [C] 60 80 100 SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series tSS vs. Ta (VOUT= 3.3 V, fOSC= 100 kHz) 8 6 tSS [ms] tSS vs. Ta (VOUT= 3.3 V, fOSC= 300 kHz) 8 6 tSS 4 [ms] 2 4 2 0 -40 8 -20 0 20 40 Ta [C] 60 80 0 -40 -20 100 0 20 40 Ta [C] 60 80 100 tSS vs. Ta (VOUT= 3.3 V, fOSC= 600 kHz) 6 tSS [ms] 4 2 0 -40 -20 1.2 0 20 40 Ta [C] 60 80 100 VST1 vs. Ta (VOUT= 3.3 V, fOSC= 100 kHz) 1.0 1.0 0.8 VST1 [V] 0.8 VST2 0.6 [V] 0.4 0.2 0.2 0.0 0.0 -40 -20 0 20 40 Ta [C] 60 80 100 -40 VOUT vs. Ta (VOUT= 3.3 V, fOSC= 100 kHz) [V] -20 0 20 40 Ta [C] 60 80 100 VOUT vs. Ta (VOUT= 3.3 V, fOSC= 300 kHz) 3.40 3.35 3.35 VOUT 0.6 0.4 3.40 VST2 vs. Ta (VOUT= 3.3 V, fOSC= 100 kHz) 1.2 VOUT 3.30 [V] 3.30 3.25 3.25 3.20 3.20 -40 -20 0 20 40 Ta [C] 60 80 100 -40 Seiko Instruments Inc. -20 0 20 40 Ta [C] 60 80 100 39 SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series 3.40 VOUT vs. Ta (VOUT= 3.3 V, fOSC= 600 kHz) 3.35 VOUT [V] 3.30 3.25 3.20 -40 40 -20 0 20 40 Ta [C] 60 80 100 Seiko Instruments Inc. SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series Example of Major Power Supply Dependence Characteristics (Ta = 25C) 50 ISS1,2 vs. VDD (VOUT = 3.3 V, fOSC= 300 kHz) 100 40 80 ISS1,2 30 ISS1,2 60 [A] 20 [A] 10 ISS1,2 vs. VDD (VOUT = 3.3 V, fOSC= 600 kHz) 40 20 0 0 0 2 4 6 VDD [V] 8 10 0 2 4 6 VDD [V] 8 10 ISSS vs. VDD (VOUT = 3.3 V, fOSC= 300 kHz) 1.0 0.8 ISSS 0.6 [A] 0.4 0.2 0.0 0 2 4 VDD [V] 6 8 10 fOSC vs. VDD (fOSC= 100 kHz) 120 f OSC vs. VDD (fOSC= 300 kHz) 360 100 300 fosc 80 [kHz] 60 fosc 240 [kHz] 180 40 120 60 20 0 2 0 2 720 4 6 8 10 VDD [V] f OSC vs. VDD (fOSC= 600 kHz) 0 2 4 6 VDD [V] 8 10 600 fosc 480 [kHz] 360 240 120 4 6 VDD [V] 8 10 Seiko Instruments Inc. 41 SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series MaxDuty vs. VDD (fOSC= 100 kHz) 100 MaxDuty vs. VDD (fOSC= 300 kHz) 100 90 90 80 MaxDuty 70 [%] 80 MaxDuty 70 [%] 60 60 50 50 0 2 4 6 8 10 VDD [V] MaxDuty vs. VDD (fOSC= 600 kHz) 0 2 100 0 2 4 6 VDD [V] 8 10 4 8 10 90 80 MaxDuty 70 [%] 60 50 4 6 VDD [V] 8 10 IEXTH vs. VDD -100 -80 -80 IEXTH -60 IEXTL -60 [mA] [mA] -40 -40 -20 -20 0- 00 2 4 VDD [V] 6 8 10 0 VOUT vs. VDD (VOUT= 3.3 V, fOSC= 100 kHz, VDD separate type) VIN= 1.98 V, IOUT= 66 mA 3.5 VOUT VDD [V] 6 3.0 VOUT 2.5 [V] 2.0 2.5 2.0 1.5 1.5 0 42 2 VOUT vs. VDD (VOUT= 3.3 V, fOSC= 300 kHz, VDD separate type) VIN= 1.98 V, IOUT= 66 mA 3.5 3.0 [V] IEXTL vs. VDD -100 2 4 6 VDD [V] 8 10 Seiko Instruments Inc. 0 2 4 6 VDD [V] 8 10 SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series VOUT vs. VDD (VOUT= 3.3 V, fOSC= 600 kHz, VDD separate type) VIN= 1.98 V, IOUT= 66 mA 3.5 3.0 VOUT [V] 2.5 2.0 1.5 0 2 4 6 VDD [V] 8 10 Seiko Instruments Inc. 43 SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series Output Waveforms 1. S-8358B33MC 1-1. IOUT = 1 mA 1-2. IOUT = 20 mA 3.40 3.35 Output voltage 3.30 [0.05 V/div] 4 CONT 3.25 2 voltage 0 -25 -20 -15 -10 -5 0 5 10 15 20 25 Time [s] [2.0 V/div] 3.40 3.35 Output voltage 3.30 [0.05 V/div] 4 3.25 CONT voltage 2 [2.0 V/div] 0 -25 -20 -15 -10 -5 0 5 10 15 20 25 Time [s] 1-3. IOUT = 100 mA 1-4. IOUT = 200 mA 3.40 3.40 3.35 Output voltage 3.30 [0.05 V/div] 4 CONT voltage 3.30 [0.05 V/div] 4 3.25 CONT 2 voltage 3.35 Output 2 voltage [2.0 V/div] 0 0 -25 -20 -15 -10 -5 0 5 10 15 20 25 Time [s] [2.0 V/div] -25 -20 -15 -10 -5 0 5 10 15 20 25 Time [s] 3.25 2. S-8358F33MC 2-1. IOUT = 1 mA 2-2. IOUT = 10 mA 3.40 3.40 Output 3.35 voltage 3.30 [0.05 V/div] 4 CONT 3.25 Output 3.35 voltage 3.30 [0.05 V/div] CONT 2 voltage 2 voltage [2.0 V/div] 0 3.25 4 [2.0 V/div] 0 -10 -8 -6 -4 -2 0 2 4 Time [s] 6 8 -10 -8 -6 -4 -2 0 2 Time [s] 10 2-3. IOUT = 100 mA 4 6 8 10 2-4. IOUT = 200 mA 3.40 3.40 3.35 Output voltage 3.30 3.30 2 -10 -8 -6 -4 -2 0 2 Time [s] 3.25 4 CONT voltage 2 [2.0 V/div] 0 [2.0 V/div] 0 44 voltage 3.25 4 CONT 3.35 [0.05 V/div] [0.05 V/div] voltage Output 4 6 8 10 Seiko Instruments Inc. -10 -8 -6 -4 -2 0 2 Time [s] 4 6 8 10 SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series 3. S-8358N33MC 3-1. IOUT = 1 mA 3-2. IOUT = 10 mA 3.40 3.40 Output 3.35 voltage 3.30 [0.05 V/div] CONT 3.35 voltage 3.30 [0.05 V/div] 3.25 4 voltage Output CONT 2 [2.0 V/div] 0 -5 -4 -3 -2 -1 0 1 Time [s] 2 voltage [2.0 V/div] 0 2 3 4 -5 -4 -3 -2 -1 0 1 Time [s] 5 3-3. IOUT = 100 mA 3.25 4 2 3 4 5 3-4. IOUT = 200 mA 3.40 3.40 Output 3.35 voltage 3.30 3.25 4 voltage 3.30 voltage 3.25 [0.05 V/div] [0.05 V/div] CONT 3.35 Output CONT 2 [2.0 V/div] 0 -5 -4 -3 -2 -1 0 1 Time [s] 3.20 4 voltage 2 [2.0 V/div] 0 2 3 4 5 Seiko Instruments Inc. -5 -4 -3 -2 -1 0 1 Time [s] 2 3 4 5 45 SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series Examples of Transient Response characteristics 1. Powering ON (VIN: 0 V 2.0 V) 1-1. 100 kHz, IOUT = 1 mA 1-2. 100 kHz, IOUT = 100 mA 4 2 VIN [V] 2 [V] 0 0 1 2 3 4 5 time [ms] 6 7 8 [V] 0 -1 0 9 1 2 3 4 5 time [ms] 6 7 8 9 1-4. 300 kHz, IOUT = 100 mA 4 2 [V] 0 2 4 VOUT 2 VIN [V] 0 VOUT [V] 0 2 [V] 0 -1 0 1 2 3 4 5 time [ms] 6 7 8 -1 0 9 1-5. 600 kHz, IOUT = 1 mA 1 2 3 4 5 time [ms] 6 7 8 9 1-6. 600 kHz, IOUT = 100 mA 4 2 0 2 [V] 0 4 VOUT [V] 2 VIN 0 2 [V] 0 -1 0 46 2 VOUT [V] 0 1-3. 300 kHz, IOUT = 1 mA VIN 2 VIN 0 -1 VIN 4 VOUT 1 2 3 4 5 time [ms] 6 7 8 9 -1 0 Seiko Instruments Inc. 1 2 3 4 5 time [ms] 6 7 8 9 VOUT [V] SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series 2. Responses of shutdown pin (VON/OFF: 0 V 2.0 V) 2-1. 100 kHz, IOUT = 1 mA 2-2. 100 kHz, IOUT = 100 mA 4 2 [V] [V] 0 2 VON/OFF [V] 1 2 3 4 5 time [ms] 6 7 8 6 7 8 9 VOUT [V] 0 0 -1 0 1 2 3 4 5 time [ms] 6 7 8 9 2-6. 600 kHz, IOUT = 100 mA 2 0 2 VON/OFF 4 VOUT [V] 2 6 7 8 9 VOUT [V] 0 2 VON/OFF [V] 0 3 4 5 time [ms] 8 2 9 4 2 7 2 VON/OFF 2-5. 600 kHz, IOUT = 1 mA 1 6 4 [V] -1 0 3 4 5 time [ms] [V] 0 3 4 5 time [ms] 2 VOUT 0 2 VON/OFF 2 1 2-4. 300 kHz, IOUT = 100 mA 2 1 [V] 0 -1 0 4 -1 0 VOUT 0 9 2-3. 300 kHz, IOUT = 1 mA [V] 2 2 VON/OFF 0 -1 0 [V] 4 VOUT 0 -1 0 Seiko Instruments Inc. 1 2 3 4 5 time [ms] 6 7 8 9 47 SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series 3. Load fluctuations 3-1. 100 kHz, IOUT: 100 A 100 mA 3-2. 100 kHz, IOUT: 100 mA 100 A 3.60 IOUT 100 mA 3.80 IOUT 100 mA 100 A 3.40 100 A 3.20 [0.2 V/div] VOUT 3.60 VOUT [0.2 V/div] 3.40 3.00 3.20 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 time [ms] -10 0 3-3. 300 kHz, IOUT: 100 A 100 mA 10 20 30 40 50 60 70 80 90 time [ms] 3-4. 300 kHz, IOUT: 100 mA 100 A 3.60 IOUT 100 mA 3.80 IOUT 100 mA 100 A 3.40 100 A VOUT VOUT [0.2 V/div] 3.20 [0.2 V/div] 3.60 3.40 3.00 3.20 -0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 time [ms] -10 0 3-5. 600 kHz, IOUT: 0.1 mA 100 mA 3-6. 600 kHz, IOUT: 100 mA 0.1 mA 3.60 IOUT 10 20 30 40 50 60 70 80 90 time [ms] IOUT 3.80 100 mA 100 mA 100 A 3.40 100 A 3.60 VOUT [0.2 V/div] 3.20 [0.2 V/div] 3.00 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 time [ms] 48 3.40 VOUT Seiko Instruments Inc. 3.20 3.00 -0.5 0 0.5 1.0 1.5 2.0 time [ms] 2.5 3.0 SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series 4. Input voltage fluctuations 4-1. 100 kHz, IOUT = 100 mA, VIN = 1.98 V 2.64 V 4-2. 100 kHz, IOUT = 100 mA, VIN = 2.64 V 1.98 V 3.0 3.0 VIN 2.5 [V] 2.0 3.45 1.5 3.35 3.40 3.30 VOUT [V] VIN 2.5 [V] 2.0 3.45 1.5 3.35 3.40 3.30 VOUT [V] 3.25 3.25 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 time [ms] -0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 time [ms] 4-3. 300 kHz, IOUT = 100 mA, VIN = 1.98 V 2.64 V 4-4. 100 kHz, IOUT = 100 mA, VIN=2.64 V 1.98 V 3.0 3.0 VIN 2.5 [V] 2.0 3.45 1.5 3.35 3.40 3.30 VOUT [V] VIN 2.5 [V] 2.0 3.45 1.5 3.35 3.40 3.30 3.25 VOUT [V] 3.25 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 time [ms] -0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 time [ms] 4-5. 600 kHz, IOUT = 100 mA, VIN = 1.98 V 2.64 V 4-6. 600 kHz, IOUT = 100 mA, VIN = 2.64 V 1.98 V 3.0 3.0 VIN 2.5 [V] 2.0 3.45 VIN 2.5 [V] 2.0 3.45 1.5 3.35 1.5 3.35 3.40 3.30 VOUT [V] 3.30 3.25 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 time [ms] 3.40 VOUT [V] 3.25 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 time [ms] Seiko Instruments Inc. 49 SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series Reference Data Use this reference data to choose the external parts. This reference data makes it possible to choose the recommended external part based on the application and characteristics data. 1. Reference data for external parts Table 28 Efficiency vs. Output Characteristics and Output Voltage vs. Output Current Characteristics for External Parts No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Product Name S-8357F33 S-8357F50 S-8356M50 S-8357B33 S-8358B33 S-8357B50 S-8356M50 S-8357B33 S-8358B33 S-8357B50 S-8357F33 S-8356M50 S-8357N33 S-8357N50 S-8356Q33 S-8356Q50 Oscillation Frequency 300 kHz 300 kHz 300 kHz 100 kHz 100 kHz 100 kHz 300 kHz 100 kHz 100 kHz 100 kHz 300 kHz 300 kHz 600 kHz 600 kHz 600 kHz 600 kHz Output Voltage 3.3 V 5.0 V 5.0 V 3.3 V 3.3 V 5.0 V 5.0 V 3.3 V 3.3 V 5.0 V 3.3 V 5.0 V 3.3 V 5.0 V 3.3 V 5.0 V Control System PWM PWM PWM/PFM PWM PWM/PFM PWM PWM/PFM PWM PWM/PFM PWM PWM PWM/PFM PWM PWM PWM/PFM PWM/PFM Inductor Transistor Diode Output Capacitor CDRH104R-220 S-90N0312SMA M1FH3 F93 (16 V, 47 F) x 2 CDRH104R-470 S-90N0442SUA CDRH8D28-220 CDRH8D28-470 F93 (16 V, 47 F) S-90N0212SMA CXLP120-220 MA2Z748 F92 (6.3 V, 47 F) CDRH8D28-100 M1FH3 F93 (16 V, 47 F) The properties of the external parts are shown below. Table 29 Properties of External Parts Part Inductor Product Name CDRH104R-220 CDRH8D28-100 10 H, DCR*1 = 47 m, IMAX*2 = 2.7 A, Height = 3.0 mm CDRH8D28-220 22 H, DCR*1 = 99 m, IMAX*2 = 1.8 A, Height = 3.0 mm CDRH8D28-470 47 H, DCR*1 = 195 m, IMAX*2 = 1.25 A, Height = 3.0 mm MA2Z748 Transistor (Nch FET) 22 H, DCR = 73 m, IMAX*2 = 2.5 A, Height = 4.0 mm 47 H, DCR*1 = 128 m, IMAX*2 = 1.9 A, Height = 4.0 mm M1FH3 Capacitor (Output capacitance) Sumida Corporation Characteristics *1 CDRH104R-470 CXLP120-220 Diode Manufacturer F93 Sumitomo Special Metals Co., Ltd. 22 H, DCR*1 = 590 m, IMAX*2 = 0.55 A, Height = 1.2 mm Shindengen Electric Manufacturing Co., Ltd. VF*3 = 0.3 V, IF*4 = 1.5 A Matsushita Electric Industrial Co., Ltd. VF*3 = 0.4 V, IF*4 = 0.3 A Nichicon Corporation 16 V, 47 F 6.3 V, 47 F F92 S-90N0212SMA Seiko Instruments Inc. VDSS *5 = 20 V max., VGSS*6 = 12 V max., CISS*7 = 190 pF, RDS(ON)*8 = 0.16 max. (VGS*9 = 2.5 V, ID*10 = 0.5 A) S-90N0312SMA VDSS *5 = 20 V max., VGSS*6 = 8 V max., CISS*7 = 170 pF, RDS(ON)*8 = 0.14 max. (VGS*9 = 2.5 V, ID*10 = 0.5 A) S-90N0442SUA VDSS *5 = 20 V max., VGSS*6 = 8 V max., CISS*7 = 390 pF, RDS(ON)*8 = 0.07 max. (VGS*9 = 2.5 V, ID*10 = 2.0 A) *1. DC resistance, *2. Maximum allowable current, *3. Forward voltage, *4. Forward current, *5. Drain-source voltage, *6. Gate-source voltage, *7. Input capacitance, *8. Drain-source on resistance, *9 Gate-source voltage, *10 Drain current Caution 50 The values shown in the characteristics column of Table 29 above are based on the materials provided by each manufacturer. However, consider the characteristics of the original materials when using the above products. Seiko Instruments Inc. SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series 2. Reference data (1) The data of (a) output current (IOUT) vs. efficiency () characteristics and (b) output current (IOUT) vs. output voltage (VOUT) characteristics under conditions of (1) to (16) shown in Table 28 is shown below. (1) S-8357F33 (b) Output current (IOUT) vs. Output voltage (VOUT) 100 3.5 80 3.4 VOUT [V] [%] (a) Output current (IOUT) vs. Efficiency () 60 VIN=0.9 V VIN=1.8 V VIN=2.7 V 40 20 0.1 1 10 IOUT [mA] 100 3.3 3.2 VIN=0.9 V VIN=1.8 V VIN=2.7 V 3.1 3.0 0.1 1000 1 10 IOUT [mA] 100 1000 (2) S-8357F50 (b) Output current (IOUT) vs. Output voltage (VOUT) 100 5.2 80 5.1 VOUT [V] [%] (a) Output current (IOUT) vs. Efficiency () 60 VIN=2.0 V VIN=3.0 V VIN=4.0 V 40 20 0.1 1 10 IOUT [mA] 100 5.0 4.9 VIN=2.0 V VIN=3.0 V VIN=4.0 V 4.8 4.7 1000 0.1 1 10 IOUT [mA] 100 1000 (3) S-8356M50 (b) Output current (IOUT) vs. Output voltage (VOUT) 100 5.2 80 5.1 VOUT [V] [%] (a) Output current (IOUT) vs. Efficiency () 60 VIN=2.0 V VIN=3.0 V VIN=4.0 V 40 20 0.1 1 10 IOUT [mA] 100 5.0 4.9 VIN=2.0 V VIN=3.0 V VIN=4.0 V 4.8 4.7 1000 Seiko Instruments Inc. 0.1 1 10 IOUT [mA] 100 1000 51 SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series (4) S-8357B33 (a) Output current (IOUT) vs. Efficiency () (b) Output current (IOUT) vs. Output voltage (VOUT) 3.5 100 3.4 VOUT [V] [%] 80 60 VIN=0.9 V VIN=1.8 V VIN=2.7 V 40 20 0.1 1 10 IOUT [mA] 100 3.3 3.2 VIN=0.9 V VIN=1.8 V VIN=2.7 V 3.1 3.0 0.1 1000 1 10 IOUT [mA] 100 1000 (5) S-8358B33 (a) Output current (IOUT) vs. Efficiency () (b) Output current (IOUT) vs. Output voltage (VOUT) 3.5 100 3.4 VOUT [V] [%] 80 60 VIN=0.9 V VIN=1.8 V VIN=2.7 V 40 20 0.1 1 10 IOUT [mA] 100 3.3 3.2 VIN=0.9 V VIN=1.8 V VIN=2.7 V 3.1 3.0 0.1 1000 1 10 IOUT [mA] 100 1000 (6) S-8357B50 (a) Output current (IOUT) vs. Efficiency () (b) Output current (IOUT) vs. Output voltage (VOUT) 100 5.2 5.1 VOUT [V] [%] 80 60 VIN=2.0 V VIN=3.0 V VIN=4.0 V 40 20 5.0 4.9 VIN=2.0 V VIN=3.0 V VIN=4.0 V 4.8 4.7 0.1 1 10 IOUT [mA] 100 0.1 1000 1 10 IOUT [mA] 100 1000 (7) S-8356M50 (a) Output current (IOUT) vs. Efficiency () (b) Output current (IOUT) vs. Output voltage (VOUT) 5.2 100 5.1 VOUT [V] [%] 80 60 VIN=2.0 V VIN=3.0 V VIN=4.0 V 40 20 0.1 52 1 10 IOUT [mA] 100 5.0 4.9 VIN=2.0 V VIN=3.0 V VIN=4.0 V 4.8 4.7 1000 Seiko Instruments Inc. 0.1 1 10 IOUT [mA] 100 1000 SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series (8) S-8357B33 (a) Output current (IOUT) vs. Efficiency () (b) Output current (IOUT) vs. Output voltage (VOUT) 3.5 100 3.4 VOUT [V] [%] 80 60 VIN=0.9 V VIN=1.8 V VIN=2.7 V 40 20 0.1 1 10 IOUT [mA] 100 3.3 3.2 VIN=0.9 V VIN=1.8 V VIN=2.7 V 3.1 3.0 1000 0.1 1 10 IOUT [mA] 100 1000 (9) S-8358B33 (a) Output current (IOUT) vs. Efficiency () (b) Output current (IOUT) vs. Output voltage (VOUT) 3.5 100 3.4 VOUT [V] [%] 80 60 VIN=0.9 V VIN=1.8 V VIN=2.7 V 40 20 0.1 1 10 IOUT [mA] 100 3.3 3.2 VIN=0.9 V VIN=1.8 V VIN=2.7 V 3.1 3.0 1000 0.1 1 10 IOUT [mA] 100 1000 (10) S-8357B50 (a) Output current (IOUT) vs. Efficiency () (b) Output current (IOUT) vs. Output voltage (VOUT) 5.2 100 5.1 VOUT [V] [%] 80 60 VIN=2.0 V VIN=3.0 V VIN=4.0 V 40 20 0.1 1 10 IOUT [mA] 100 5.0 4.9 4.8 4.7 0.1 1000 VIN=2.0 V VIN=3.0 V VIN=4.0 V 1 10 IOUT [mA] 100 1000 (11) S-8357F33 (a) Output current (IOUT) vs. Efficiency () (b) Output current (IOUT) vs. Output voltage (VOUT) 3.5 100 3.4 VOUT [V] [%] 80 60 VIN=0.9 V VIN=1.8 V VIN=2.7 V 40 20 0.1 1 10 IOUT [mA] 100 3.3 3.2 VIN=0.9 V VIN=1.8 V VIN=2.7 V 3.1 3.0 1000 0.1 Seiko Instruments Inc. 1 10 IOUT [mA] 100 1000 53 SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series (12) S-8356M50 (a) Output current (IOUT) vs. Efficiency () (b) Output current (IOUT) vs. Output voltage (VOUT) 5.2 100 5.1 VOUT [V] [%] 80 60 VIN=2.0 V VIN=3.0 V VIN=4.0 V 40 20 0.1 1 10 IOUT [mA] 100 5.0 4.9 VIN=2.0 V VIN=3.0 V VIN=4.0 V 4.8 4.7 1000 0.1 1 10 IOUT [mA] 100 1000 (13) S-8357N33 (b) Output current (IOUT) vs. Output voltage (VOUT) 100 3.5 80 3.4 VOUT [V] [%] (a) Output current (IOUT) vs. Efficiency () 60 40 VIN=0.9 V VIN=1.8 V VIN=2.7 V 20 0 0.1 1 10 IOUT [mA] 100 3.3 3.2 VIN=0.9 V VIN=1.8 V VIN=2.7 V 3.1 3.0 0.1 1000 1 10 IOUT [mA] 100 1000 (14) S-8357N50 (b) Output current (IOUT) vs. Output voltage (VOUT) 100 5.2 80 5.1 VOUT [V] [%] (a) Output current (IOUT) vs. Efficiency () 60 40 VIN=2.0 V VIN=3.0 V VIN=4.0 V 20 0 0.1 1 10 IOUT [mA] 100 5.0 4.9 VIN=2.0 V VIN=3.0 V VIN=4.0 V 4.8 4.7 0.1 1000 1 10 IOUT [mA] 100 1000 (15) S-8356Q33 3.5 80 3.4 60 40 20 0 0.1 54 (b) Output current (IOUT) vs. Output voltage (VOUT) 100 VOUT [V] [%] (a) Output current (IOUT) vs. Efficiency () 10 IOUT [mA] 100 3.2 VIN=1.8 V VIN=2.7 V 3.1 VIN=1.8 V VIN=2.7 V 1 3.3 3.0 1000 0.1 Seiko Instruments Inc. 1 10 IOUT [mA] 100 1000 SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series (16) S-8356Q50 (b) Output current (IOUT) vs. Output voltage (VOUT) 100 5.2 80 5.1 VOUT [V] [%] (a) Output current (IOUT) vs. Efficiency () 60 40 20 0 0.1 10 IOUT [mA] 100 4.9 VIN=3.0 V VIN=4.0 V 4.8 VIN=3.0 V VIN=4.0 V 1 5.0 4.7 1000 0.1 Seiko Instruments Inc. 1 10 IOUT [mA] 100 1000 55 SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series 3. Reference data (2) The actual output current vs. ripple voltage characteristics data under conditions of (1) to (16) in Table 28 are shown below. (1) S-8357F33 VIN=0.9 V VIN=1.8 V VIN=2.7 V 100 Vr [mV] Vr [mV] (2) S-8357F50 150 150 50 VIN=2.0 V VIN=3.0 V VIN=4.0 V 100 50 0 0 0.1 1 10 100 1000 0.1 1 (3) S-8356M50 Vr [mV] Vr [mV] 1000 100 1000 100 1000 VIN=0.9 V VIN=1.8 V VIN=2.7 V 100 50 0 0 0.1 1 10 100 1000 0.1 1 IOUT [mA] 150 (6) S-8357B50 150 Vr [mV] VIN=0.9 V VIN=1.8 V VIN=2.7 V 100 10 IOUT [mA] (5) S-8358B33 Vr [mV] 100 150 VIN=2.0 V VIN=3.0 V VIN=4.0 V 50 50 VIN=2.0 V VIN=3.0 V VIN=4.0 V 100 50 0 0 0.1 1 10 100 1000 0.1 1 IOUT [mA] 150 (8) S-8357B33 150 Vr [mV] VIN=2.0 V VIN=3.0 V VIN=4.0 V 100 10 IOUT [mA] (7) S-8356M50 Vr [mV] 1000 (4) S-8357B33 150 50 VIN=0.9 V VIN=1.8 V VIN=2.7 V 100 50 0 0 0.1 1 10 100 1000 0.1 IOUT [mA] 56 100 IOUT [mA] IOUT [mA] 100 10 1 10 IOUT [mA] Seiko Instruments Inc. SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Rev.4.1_00 S-8355/56/57/58 Series (9) S-8358B33 (10) S-8357B50 150 VIN=0.9 V VIN=1.8 V VIN=2.7 V 100 Vr [mV] Vr [mV] 150 50 VIN=2.0 V VIN=3.0 V VIN=4.0 V 100 50 0 0 0.1 1 10 100 1000 0.1 1 IOUT [mA] Vr [mV] Vr [mV] 150 50 100 1000 100 1000 100 1000 0 0.1 1 10 100 0.1 1000 1 (13) S-8357N33 (14) S-8357N50 100 100 VIN=0.9 V VIN=1.8 V VIN=2.7 V 60 VIN=2.0 V VIN=3.0 V VIN=4.0 V 80 Vr [mV] 80 10 IOUT [mA] IOUT [mA] Vr [mV] 100 VIN=2.0 V VIN=3.0 V VIN=4.0 V 50 0 40 20 60 40 20 0 0 0.1 1 10 100 0.1 1000 1 IOUT [mA] 100 (16) S-8356Q50 100 VIN =1.8 V VIN =2.7 V VIN=3.0 V VIN=4.0 V 80 Vr [mV] 80 10 IOUT [mA] (15) S-8356Q33 Vr [mV] 1000 (12) S-8356M50 VIN=0.9 V VIN=1.8 V VIN=2.7 V 100 100 IOUT [mA] (11) S-8357F33 150 10 60 40 20 60 40 20 0 0 0.1 1 10 100 1000 0.1 1 10 IOUT [mA] IOUT [mA] Seiko Instruments Inc. 57 4.50.1 1.50.1 1.60.2 1 2 3 1.50.1 1.50.1 0.40.05 45 0.40.1 0.40.1 0.450.1 No. UP003-A-P-SD-1.1 TITLE SOT893-A-PKG Dimensions No. UP003-A-P-SD-1.1 SCALE UNIT mm Seiko Instruments Inc. +0.1 o1.5 -0 4.00.1(10 pitches : 40.00.2) 2.00.05 o1.5 +0.1 -0 5 max. 0.30.05 8.00.1 2.00.1 4.750.1 Feed direction No. UP003-A-C-SD-1.1 TITLE SOT893-A-Carrier Tape No. UP003-A-C-SD-1.1 SCALE UNIT mm Seiko Instruments Inc. 16.5max. 13.00.3 Enlarged drawing in the central part (60) (60) No. UP003-A-R-SD-1.1 SOT893-A-Reel TITLE No. UP003-A-R-SD-1.1 SCALE UNIT QTY. mm Seiko Instruments Inc. 1,000 2.90.2 1 2 3 0.16 +0.1 -0.05 0.950.1 1.90.2 0.40.1 No. MP003-A-P-SD-1.1 TITLE SOT233-A-PKG Dimensions MP003-A-P-SD-1.1 No. SCALE UNIT mm Seiko Instruments Inc. +0.1 1.5 -0.05 4.00.1 2.00.1 1.10.1 0.250.05 1.60.1 4.00.1 2.850.2 3 2 1 Feed direction No. MP003-A-C-SD-1.1 TITLE No. SOT233-A-Carrier Tape MP003-A-C-SD-1.1 SCALE UNIT mm Seiko Instruments Inc. 12.5max. 9.00.3 Enlarged drawing in the central part o130.2 (60) (60) No. MP003-A-R-SD-1.1 TITLE SOT233-A-Reel No. MP003-A-R-SD-1.1 SCALE UNIT QTY. 3,000 mm Seiko Instruments Inc. 2.90.2 1.90.2 4 5 1 2 +0.1 0.16 -0.06 3 0.950.1 0.40.1 No. MP005-A-P-SD-1.2 TITLE No. SOT235-A-PKG Dimensions MP005-A-P-SD-1.2 SCALE UNIT mm Seiko Instruments Inc. 4.00.1(10 pitches:40.00.2) +0.1 o1.5 -0 2.00.05 +0.2 o1.0 -0 0.250.1 4.00.1 1.40.2 3.20.2 3 2 1 4 5 Feed direction No. MP005-A-C-SD-2.1 TITLE SOT235-A-Carrier Tape No. MP005-A-C-SD-2.1 SCALE UNIT mm Seiko Instruments Inc. 12.5max. 9.00.3 Enlarged drawing in the central part o130.2 (60) (60) No. MP005-A-R-SD-1.1 SOT235-A-Reel TITLE No. MP005-A-R-SD-1.1 SCALE QTY. UNIT mm Seiko Instruments Inc. 3,000 R(0.075) 6 5 4 1 2 3 (0.125) 0.140.05 0.20.08 1.80.15 0.50.1 0.80.05 0.50.1 No. BD006-A-P-SD-1.1 TITLE SNB6B-A-PKG Dimensions No. BD006-A-P-SD-1.1 SCALE UNIT mm Seiko Instruments Inc. o1.50.1 4.00.1 2.00.05 o1.10.1 0.250.05 1.10.1 4.00.1 2.20.1 3 2 1 4 5 6 Feed direction No. BD006-A-C-SD-2.1 TITLE SNB6B-A-Carrier Tape BD006-A-C-SD-2.1 No. SCALE UNIT mm Seiko Instruments Inc. 12.5max. 9.00.3 Enlarged drawing in the central part o130.2 No. BD006-A-R-SD-1.1 TITLE SNB6B-A-Reel No. BD006-A-R-SD-1.1 SCALE UNIT QTY. mm Seiko Instruments Inc. 3,000 * * * * * * The information described herein is subject to change without notice. Seiko Instruments Inc. is not responsible for any problems caused by circuits or diagrams described herein whose related industrial properties, patents, or other rights belong to third parties. The application circuit examples explain typical applications of the products, and do not guarantee the success of any specific mass-production design. When the products described herein are regulated products subject to the Wassenaar Arrangement or other agreements, they may not be exported without authorization from the appropriate governmental authority. Use of the information described herein for other purposes and/or reproduction or copying without the express permission of Seiko Instruments Inc. is strictly prohibited. The products described herein cannot be used as part of any device or equipment affecting the human body, such as exercise equipment, medical equipment, security systems, gas equipment, or any apparatus installed in airplanes and other vehicles, without prior written permission of Seiko Instruments Inc. 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