Datasheet AS1361/AS1362 150mA/300mA, Ultra-Low-Noise, High-PSRR Low Dropout Regulators, with POK 1 General Description 2 Key Features The AS1361/AS1362 are ultra-low-noise, low-dropout linear regulators specifically designed to deliver up to 150/300mA continuous output current, and can achieve a low 140mV dropout for 300mA load current. The LDOs are designed and optimized to work with low-cost, smallcapacitance ceramic capacitors. The devices are available as the standard products listed in Table 1. Table 1. Standard Products ! Preset Output Voltages: 1.5 to 4.5V (in 50mV steps) ! Output Noise: 9VRMS @ 100Hz to 100kHz ! Power-Supply Rejection Ratio: 92dB @ 1kHz ! Low Dropout: 140mV @ 300mA Load ! Power-OK Output ! Stable with 1F Ceramic Capacitor for any Load Model Load Current Output Voltage ! Guaranteed 150/300mA Output AS1361 150mA Preset - 1.5 to 4.5V ! 1.25V Internal Reference AS1362 300mA Preset - 1.5 to 4.5V ! Extremely-Low Quiescent Current: 40A An integrated P-channel MOSFET pass transistor allows the devices to maintain extremely low quiescent current (40A). ! Excellent Load/Line Transient ! Overcurrent and Thermal Protection The AS1361/AS1362 uses an advanced architecture to achieve ultra-low output voltage noise of 9VRMS and a power-supply rejection-ratio of better than 80dB (up to 10kHz). ! TSOT23 6-pin Package 3 Applications The devices are ideal for mobile phones, wireless phones, PDAs, handheld computers, mobile phone base stations, Bluetooth portable radios and accessories, wireless LANs, digital cameras, personal audio devices, and any other portable, battery-powered application. An active-Low, open-drain power-ok output indicates if the output voltage is within regulation. The AS1361/AS1362 requires only 1F output capacitor for stability at any load. When the LDO is disabled, current consumption drops below 500nA. The devices are available in a TSOT23 6-pin package. Figure 1. Typical Application Circuit Input 2 to 5.5V OUT IN CIN 1F On Off Output 1.5 to 4.5V 6 1 IN 1 6 OUT 100k 3 SHDNN AS1361/ AS1362 2 GND www.austriamicrosystems.com 4 GND 2 POK 5 BYPASS CBYPASS 10nF SHDNN 3 AS1361/ AS1362 5 BYPASS 4 POK COUT 1F Revision 1.03 1 - 15 AS1361/AS1362 Datasheet - P i n o u t 4 Pinout Pin Assignments Figure 2. Pin Assignments (Top View) IN 1 GND 2 6 OUT AS1361/ AS1362 SHDNN 3 5 BYPASS 4 POK TSOT23 6-pin Pin Descriptions Table 2. Pin Descriptions Pin Number Pin Name 1 IN 2 GND 3 SHDNN Description Unregulated Input Supply. Ground Shutdown. Pull this pin low to disable the LDO. Power-OK Output. Active-Low, open-drain output indicates if the output voltage is within regulation. 0 = VOUT <94% VOUTNOM 1 = VOUT >94% VOUTNOM 4 POK 5 BYPASS Noise Bypass for Low-Noise Operation. Connect a 10nF capacitor from this pin to OUT. Note: This pin is shorted to GND in shutdown mode. 6 OUT Regulated Output Voltage. Bypass this pin with a capacitor to GND. See Capacitor Selection and Regulator Stability on page 12 for more details. www.austriamicrosystems.com Revision 1.03 2 - 15 AS1361/AS1362 Datasheet - A b s o l u t e M a x i m u m R a t i n g s 5 Absolute Maximum Ratings Stresses beyond those listed in Table 3 may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in Electrical Characteristics on page 4 is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Table 3. Absolute Maximum Ratings Parameter Min Max Units IN to GND -0.3 +7 V OUT, SHDNN, POK to GND -0.3 IN + 0.3 V BYPASS to GND -0.3 OUT + 0.3 V Output Short-Circuit Duration Infinite Thermal Resistance JA 201.7 C/W +85 C Operating Temperature Range -40 Junction Temperature Storage Temperature Range Package Body Temperature www.austriamicrosystems.com -65 +150 C +150 C +260 C Revision 1.03 Comments on PCB The reflow peak soldering temperature (body temperature) specified is in accordance with IPC/JEDEC J-STD-020D "Moisture/Reflow Sensitivity Classification for Non-Hermetic Solid State Surface Mount Devices". The lead finish for Pb-free leaded packages is matte tin (100% Sn). 3 - 15 AS1361/AS1362 Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s 6 Electrical Characteristics VIN = VOUT +0.5V, CIN = 1F, COUT = 1F, CBYPASS = 10nF, TAMB = -40 to +85C (unless otherwise specified). Typ values are at TAMB = +25C. Limits 100% tested at +25C. Limits over operating temperature range guaranteed by design. Table 4. Electrical Characteristics Symbol Parameter VIN Input Voltage Range Condition Output Voltage Accuracy IOUT Maximum Output Current ILIMIT Current Limit Dropout Voltage 1 Min Max Unit 2 Typ 5.5 V IOUT = 1mA, TAMB = +25C -0.5 +0.5 IOUT = 100A to 150mA, TAMB = +25C (AS1361) -0.75 +0.75 IOUT = 100A to 300mA, TAMB = +25C (AS1362) -1.0 +1.0 IOUT = 100A to 150mA, (AS1361) -1.5 +1.5 IOUT = 100A to 300mA, (AS1362) -2.0 +2.0 AS1361 150 AS1362 300 % mA AS1361, OUT = 90% of nom., TAMB = +25C 270 AS1362, OUT = 90% of nom., TAMB = +25C 510 VOUT 3V, IOUT = 150mA 70 95 VOUT 3V, IOUT = 300mA, AS1362 140 200 2.5V VOUT < 3V, IOUT = 150mA 90 120 2.5V VOUT < 3V, IOUT = 300mA, AS1362 170 230 2.0V VOUT < 2.5V, IOUT = 150mA 140 190 2.0V VOUT < 2.5V, IOUT = 300mA, AS1362 270 350 mA mV IOUT = 0.05mA 40 90 VIN = VOUTNOM - 0.1V, IOUT = 0mA 150 250 Line Regulation VIN = (VOUT +0.5V) to 5.5V, IOUT = 0.1mA 0.02 %/V VLDR Load Regulation IOUT = 1 to 150/300mA 0.0005 %/mA ISHDNN Shutdown Supply Current IQ Quiescent Current VLNR PSRR Ripple Rejection Output Noise Voltage (RMS) SHDNN = 0V 9 f = 1kHz, IOUT = 10mA 92 f = 10kHz, IOUT = 10mA 80 f = 100kHz, IOUT = 10mA 62 f = 100Hz to 100kHz, ILOAD = 0 to 150/300mA 9 500 A nA dB V Shutdown 2 RLOAD = 50 300 s SHDNN Logic Low Level VIN = 2 to 5.5V 0.4 V SHDNN Logic High Level VIN = 2 to 5.5V 1.5 IOUT = 0, VOUTRISING 90 Shutdown Exit Delay V Power-OK Output VPOK VOL Power-OK Voltage Threshold Hysteresis, IOUT = 0 94 98 1.5 % VOUT POK Output Voltage Low ISINK = 1mA 0.3 V POK Output Leakage Current VOUT in regulation 1 A www.austriamicrosystems.com Revision 1.03 4 - 15 AS1361/AS1362 Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s Table 4. Electrical Characteristics (Continued) Symbol Parameter Condition Min Typ Max Unit Thermal Protection TSHDNM TSHDN M Thermal Shutdown Temperature 160 C Thermal Shutdown Hysteresis 15 C 1. Dropout is defined as VIN - VOUT when VOUT is 100mV below the value of VOUT for VIN = VOUT + 0.5V. 2. Time needed for VOUT to reach 90% of final value. Note: All limits are guaranteed. The parameters with min and max values are guaranteed with production tests or SQC (Statistical Quality Control) methods. www.austriamicrosystems.com Revision 1.03 5 - 15 AS1361/AS1362 Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s 7 Typical Operating Characteristics VIN = VOUT + 0.5V, CIN = COUT = 1F, CBYPASS = 10nF, TAMB = 25C (unless otherwise specified). Figure 3. Output Voltage vs. Input Voltage Figure 4. Output Voltage Accuracy vs. Load Current 3.5 . 0.5 0.4 Output Voltage Deviation (%) Output Voltage (V) . 3 IOUT = 150mA 2.5 IOUT = 300mA 2 1.5 1 0.5 0 0.3 0.2 0.1 Temp = -45C 0 -0.1 Temp = 25C -0.2 Temp = 85C -0.3 -0.4 -0.5 0 1 2 3 4 5 6 0 50 Input Voltage (V) 100 150 200 250 300 Load Current (mA) Figure 5. Output Voltage Accuracy vs. Temperature Figure 6. Dropout Voltage vs. Load Current 1 . 140 Dropout Voltage (mV) . Output Voltage Deviation (%) 0.8 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 100 Temp = 85C Temp = 25C 80 60 Temp = -45C 40 20 -0.8 -1 -40 120 0 -15 10 35 60 85 0 Temperature (C) 50 100 150 200 250 300 Load Current (mA) Figure 7. Dropout Voltage vs. Output Voltage Dropout Voltage (mV) . 80 70 60 50 40 30 20 10 0 2 2.2 2.4 2.6 2.8 3 3.2 Output Voltage (V) www.austriamicrosystems.com Revision 1.03 6 - 15 AS1361/AS1362 Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s Figure 8. Ground Pin Current vs. Input Voltage Figure 9. Ground Pin Current vs. Load Current 80 100 IOUT= 300mA 75 IOUT = 150mA 50 IOUT = 0mA 25 . 125 75 Ground Pin Current (A) Ground Pin Current (A) . 150 70 65 60 55 50 45 40 35 0 0 1 2 3 4 5 0 6 50 100 150 200 250 300 Load Current (mA) Input Voltage (V) Figure 10. Ground Pin Current vs. Temperature Figure 11. PSRR vs. Frequency; IOUT = 10mA 100 45 80 PSRR (dB) Ground Pin Current (A) . 50 40 35 30 25 -40 60 40 20 -15 10 35 60 0 0.01 85 Temperature (C) Figure 12. Output Noise Spectral Density vs. Freq. 100 10000 Figure 13. Output Noise vs. Bypass Capacitance 10000 15 . 14 . 13 12 1000 Noise (Vrms) Output Noise Density (nV/ Hz) 1 Frequency (kHz) 100 11 10 9 8 7 6 10 0.01 5 0.1 1 10 100 1 Frequency (kHz) www.austriamicrosystems.com 10 100 Capacitance (nF) Revision 1.03 7 - 15 AS1361/AS1362 Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s 200s/Div 2V/Div SHDNN 2V/DIV VOUT POK 20mV/DIV VIN VOUT 2V/Div Figure 17. Enter & Exit Shutdown Delay 500mV/Div Figure 16. Line Transient Response 200s/Div www.austriamicrosystems.com 20mA/Div IOUT VOUT 200s/Div 20mV/DIV 20mA/Div Figure 15. Load Transient Response near Dropout, VIN = 3.4V, VOUT = 3.3V 20mV/DIV VOUT IOUT Figure 14. Load Transient Response, VIN = 3.8V, VOUT = 3.3V 200s/Div Revision 1.03 8 - 15 AS1361/AS1362 Datasheet - D e t a i l e d D e s c r i p t i o n 8 Detailed Description The AS1361/AS1362 are ultra-low-noise, low-dropout, low-quiescent current linear-regulators specifically designed for space-limited applications. The devices are available with preset output voltages from 1.5 to 4.5V in 50mV increments. These devices can supply loads up to 150/300mA. As shown in Figure 18, the AS1361/AS1362 consist of an integrated bandgap core and noise bypass circuitry, error amplifier, P-channel MOSFET pass transistor, and internal feedback voltage-divider. The output voltage is fed back through an internal resistor voltage-divider connected to pin OUT. An external bypass capacitor connected to pin BYPASS reduces noise at the output. Additional blocks include a current limiter, thermal sensor, and shutdown logic. Internal Voltage Reference The 1.25V bandgap reference is connected to the error amplifier's inverting input. The error amplifier compares this reference with the feedback voltage and amplifies the difference. If the feedback voltage is lower than the reference voltage, the pass-transistor gate is pulled low. This allows more current to pass to the output and increases the output voltage. If the feedback voltage is too high, the pass transistor gate is pulled high, allowing less current to pass to the output. Internal P-Channel Pass Transistor The AS1361/AS1362 feature a 0.5 (typ) P-channel MOSFET pass transistor, which provides several advantages over similar designs using a PNP pass transistor, including prolonged battery life. The P-channel MOSFET does not require a base driver, thus quiescent current is dramatically reduced. The AS1361/AS1362 LDOs do not exhibit problems associated with typical PNP-based LDOs, and consume only 40A of quiescent current in light load and 220A in dropout (see Typical Operating Characteristics on page 6). Output Voltage The AS1361/AS1362 deliver preset output voltages from 1.5 to 4.5V, in 50mV increments (see Ordering Information on page 14). Shutdown The AS1361/AS1362 feature a low-power shutdown mode that reduces quiescent current to <200nA. Driving SHDNN low disables the internal voltage reference, error amplifier, gate-drive circuitry, and P-channel MOSFET pass transistor (see Figure 18), and the device output enters a high-impedance state. Note: For normal operation connect pin SHDNN to pin IN. www.austriamicrosystems.com Revision 1.03 9 - 15 AS1361/AS1362 Datasheet - D e t a i l e d D e s c r i p t i o n Figure 18. AS1361/AS1362 - Block Diagram AS1361/AS1362 IN SHDNN Shutdown and Power-Down Control - Error Amp + MOS Driver w/ ILIMIT Thermal Sensor OUT 1.25 Reference and Noise Bypass BYPASS - 95% POK + GND Power-OK The power-ok circuitry is built around an N-channel MOSFET. The circuitry monitors the output voltage and if the voltage goes out of regulation (e.g. during dropout, current limit, or thermal shutdown) pin POK goes low. The power-OK feature is not active during shutdown and provides a power-on-reset (POR) function that can operate down to VIN = 1V. A capacitor to GND may be added to generate a POR delay. To obtain a logic-level output, connect a pull-up resistor from pin POK to pin OUT. Larger values for this resistor will help minimize current consumption; a 100k resistor is perfect for most applications (see Figure 1 on page 1). Current Limit The AS1361/AS1362 include a current limiting circuitry to monitor and control the P-channel MOSFET pass transistor's gate voltage, thus limiting the device output current to 270mA (AS1361) and 510mA (AS1362). Note: See Table 4 on page 4 for the recommended min and max current limits. The output can be shorted to ground indefinitely without causing damage to the device. Thermal Protection Integrated thermal protection circuitry limits total power dissipation in the AS1361/AS1362. When the junction temperature (TJ) exceeds +160C, the thermal sensor signals the shutdown logic, turning off the P-channel MOSFET pass transistor and allowing the device to cool down. The thermal sensor turns the pass transistor on again after the device's junction temperature drops by 10C, resulting in a pulsed output during continuous thermal-overload conditions. Note: Thermal protection is designed to protect the devices in the event of fault conditions. For continuous operation, do not exceed the absolute maximum junction temperature rating of +150C. Operating Region and Power Dissipation The AS1361/AS1362 maximum power dissipation is dependant on the thermal resistance of the case and PCB, the temperature difference between the die junction and TAMB, and airflow rate. Power dissipation across the device is calculated as: (EQ 1) PD = IOUT (VIN - VOUT) www.austriamicrosystems.com Revision 1.03 10 - 15 AS1361/AS1362 Datasheet - D e t a i l e d D e s c r i p t i o n The maximum power dissipation is calculated: PDMAX = (TJ - TAMB)/(JC + CA) (EQ 2) Where: TJ - TAMB is the temperature difference between the AS1361/AS1362 die junction and the surrounding air; JC is the thermal resistance of the package; CA is the thermal resistance through the PC board/copper traces/other materials to the surrounding air. Note: Pin GND of the AS1361/AS1362 provides the electrical connection to system ground and also serves as a heat sink. Connect pin GND to the system ground using a large pad or ground plane. Noise Reduction The AS1361/AS1362 noise bypass circuitry dramatically reduces output noise, exhibiting 9VRMS of output voltage noise with CBYPASS = 0.01F and COUT = 1F. Use an external 0.01F bypass capacitor between pin BYPASS and pin OUT (see Figure 1 on page 1). Note: Startup time is minimized by internal power-on circuitry which pre-charges CBYPASS. www.austriamicrosystems.com Revision 1.03 11 - 15 AS1361/AS1362 Datasheet - A p p l i c a t i o n I n f o r m a t i o n 9 Application Information Capacitor Selection and Regulator Stability For normal operation, use a 1F capacitor at pin IN and a 1F capacitor at pin OUT. Larger input capacitor values and lower ESR provide better noise rejection and line-transient response. Reduce output noise and improve load-transient response, stability, and power-supply rejection by using large output capacitors. Note: Some ceramic dielectrics exhibit large capacitance and ESR variation with temperature. With dielectrics such as Z5U and Y5V, it may be necessary to use a 2.2F or larger output capacitor to ensure stability at temperatures below -10C. With X7R or X5R dielectrics, 1F is sufficient at all operating temperatures. Bypass Capacitor Use a 0.01F bypass capacitor at pin BYPASS for low-output voltage noise reduction. The leakage current going into pin BYPASS should be less than 10nA. Increasing the capacitance slightly decreases the output noise. Values above 0.1F and below 0.001F are not recommended. Noise, PSRR, and Transient Response The AS1361/AS1362 are designed to deliver ultra-low noise and high PSRR, as well as low dropout and low quiescent currents in battery-powered systems. The power-supply rejection is 92dB at 1kHz and 62dB at 100kHz. (see PSRR vs. Frequency; IOUT = 10mA on page 7). When operating from sources other than batteries, improved supply-noise rejection and transient response can be achieved by increasing the values of the input and output capacitors, and through passive filtering techniques. The Figure 16 and Figure 14 on page 8 show the AS1361/AS1362 line- and load-transient responses. Dropout Voltage The AS1361/AS1362 minimum dropout voltage determines the lowest usable supply voltage. In battery-powered systems, this determines the useful end-of-life battery voltage. Since the AS1361/AS1362 use a P-channel MOSFET pass transistor, the dropout voltage is a function of drain-tosource on-resistance (RDS(ON)) multiplied by ILOAD (see Figure 6 on page 6). www.austriamicrosystems.com Revision 1.03 12 - 15 AS1361/AS1362 Datasheet - P a c k a g e D r a w i n g s a n d M a r k i n g s 10 Package Drawings and Markings The devices are available in a TSOT23 6-pin package. Figure 19. TSOT23 6-pin Package Symbol A A1 A2 b b1 c Min Typ 0.01 0.84 0.30 0.31 0.12 0.05 0.87 0.35 0.15 Max 1.00 0.10 0.90 0.45 0.39 0.20 c1 0.08 0.13 0.16 D E E1 e e1 2.90BSC 2.80BSC 1.60BSC 0.95BSC 1.90BSC Notes 3,4 3,4 3,4 Symbol L L1 L2 N R R1 1 aaa bbb ccc ddd Min 0.30 Typ 0.40 0.60REF 0.25BSC 6 0.10 0.10 0 Max 0.50 Notes 0.25 4 8 4 10 12 Tolerances of Form and Position 0.15 0.25 0.10 0.20 Notes: 1. Dimensioning and tolerancing conform to ASME Y14.5M - 1994. 2. Dimensions are in millimeters. 3. Dimension D does not include mold flash, protrusions, or gate burrs. Mold flash, protrusions, and gate burrs shall not exceed 0.15mm per end. Dimension E1 does not include interlead flash or protrusion. Interlead flash or protrusion shall not exceed 0.15mm per side. Dimensions D and E1 are determined at datum H. 4. The package top can be smaller than the package bottom. Dimensions D and E1 are determined at the outermost extremes of the plastic body exclusive of mold flash, tie bar burrs, gate burrs, and interlead flash, but include any mistmatches between the top of the package body and the bottom. D and E1 are determined at datum H. www.austriamicrosystems.com Revision 1.03 13 - 15 AS1361/AS1362 Datasheet - O r d e r i n g I n f o r m a t i o n 11 Ordering Information The devices are available as the standard products shown in Table 5. Table 5. Ordering Information Ordering Code Marking Output Current Output Voltage Delivery Form Package AS1361-BTTT-15 ASL2 150mA 1.5V Tape and Reel TSOT23 6-pin AS1361-BTTT-18 ASL3 150mA 1.8V Tape and Reel TSOT23 6-pin AS1361-BTTT-25 ASL4 150mA 2.5V Tape and Reel TSOT23 6-pin AS1361-BTTT-26 ASL5 150mA 2.6V Tape and Reel TSOT23 6-pin AS1361-BTTT-27 ASL6 150mA 2.7V Tape and Reel TSOT23 6-pin AS1361-BTTT-28 ASL7 150mA 2.8V Tape and Reel TSOT23 6-pin AS1361-BTTT-285 ASL8 150mA 2.85V Tape and Reel TSOT23 6-pin AS1361-BTTT-30 ASL9 150mA 3.0V Tape and Reel TSOT23 6-pin AS1361-BTTT-33 ASMA 150mA 3.3V Tape and Reel TSOT23 6-pin AS1361-BTTT-45 ASMB 150mA 4.5V Tape and Reel TSOT23 6-pin AS1362-BTTT-15 ASMC 300mA 1.5V Tape and Reel TSOT23 6-pin AS1362-BTTT-18 ASMD 300mA 1.8V Tape and Reel TSOT23 6-pin AS1362-BTTT-25 ASME 300mA 2.5V Tape and Reel TSOT23 6-pin AS1362-BTTT-26 ASMF 300mA 2.6V Tape and Reel TSOT23 6-pin AS1362-BTTT-27 ASMG 300mA 2.7V Tape and Reel TSOT23 6-pin AS1362-BTTT-28 ASMH 300mA 2.8V Tape and Reel TSOT23 6-pin AS1362-BTTT-285 ASMI 300mA 2.85V Tape and Reel TSOT23 6-pin AS1362-BTTT-30 ASMJ 300mA 3.0V Tape and Reel TSOT23 6-pin AS1362-BTTT-33 ASMK 300mA 3.3V Tape and Reel TSOT23 6-pin AS1362-BTTT-45 ASML 300mA 4.5V Tape and Reel TSOT23 6-pin Non-standard devices from 1.5V to 4.5V are available in 50mV steps. For more information and inquiries contact http://www.austriamicrosystems.com/contact Note: All products are RoHS compliant and Pb-free. Buy our products or get free samples online at ICdirect: http://www.austriamicrosystems.com/ICdirect For further information and requests, please contact us mailto:sales@austriamicrosystems.com or find your local distributor at http://www.austriamicrosystems.com/distributor www.austriamicrosystems.com Revision 1.03 14 - 15 AS1361/AS1362 Datasheet Copyrights Copyright (c) 1997-2009, austriamicrosystems AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered (R). All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. All products and companies mentioned are trademarks or registered trademarks of their respective companies. Disclaimer Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for each application. 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