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FAN48623 -- 2500 mA, Synchronous TinyBoost(R) Regulator with Bypass Mode Features Description Maximum Continuous Load Current: 2500 mA at VIN of 2.5 V Boosting VOUT to 3.3 V Maximum Pulse Load Current of 3.5 A for GSM PAs (1 Slot) and PMIC support simultaneously, VIN=3.1 V, VOUT=3.4 V Up to 97% Efficient Input Voltage Range: 2.5 V to 5.5 V 4 External Components: 2520 case 0.47 H Inductor and 0603 Case Size Input and Output Capacitors Fixed Output Voltage Options: 3.0 V to 5.0 V True Bypass Operation when VIN > Target VOUT Integrated Synchronous Rectifier True Load Disconnect The FAN48623 is a boost regulator designed to provide a minimum output voltage from a single-cell Li-Ion battery, even when the battery voltage is below system minimum. The output voltage regulation is guaranteed up to a maximum load current of 2500 mA. The regulator transitions smoothly between Bypass and normal Boost Mode. The device can be forced into Bypass Mode to reduce quiescent current. The FAN48623 is available in a 16-bump, 0.4 mm pitch, Wafer-Level Chip-Scale Package (WLCSP). Forced Bypass Mode VSEL Control to Optimize Target VOUT VIN Short-Circuit Protection (SCP) Low Operating Quiescent Current 16-Bump, 1.81 mm x 1.81 mm, 0.4 mm Pitch, WLCSP Prevention, System PMIC LDOs Supplies, and 2G/3G/4G RF PA Supplies Smart Phones, Tablets, Portable Devices + VOUT CIN L1 Battery Applications Boost for Low-Voltage Li-ion Batteries, Brownout The FAN48623 allows systems to take advantage of new battery chemistries that can supply significant energy when the battery voltage is lower than the required voltage for system power ICs. By combining built-in power transistors, synchronous rectification, and low supply current, this IC provides a compact solution for systems using advanced LiIon battery chemistries. 0.47H COUT 10F 2x22F SW FAN48623 VSEL SYSTEM LOAD PGND AGND EN PG BYP Figure 1. Typical Application Ordering Information Part Number Output (1) Voltage VSEL0 / VSEL1 FAN48623UC315X 3.150 / 3.330 JK FAN48623UC32JX 3.20 / 3.413 JD FAN48623UC33X 3.300 / 3.489 FAN48623UC35X FAN48623UC36FX 3.5 / 3.7 Operating Temperature Package Packing Device Marking JE -40C to 85C 16-Ball, 4x4 Array, 0.4 mm Pitch, 250 m Ball, Wafer-Level Chip-Scale Package (WLCSP) Tape & Reel 3.64/ 3.709 JF JG FAN48623UC50X 5.000 / 5.286 JL FAN48623UC50GX 5.000 / 5.190 JM Note: 1. Other output voltages are available on request. Please contact a Fairchild Semiconductor representative. (c) 2013 Fairchild Semiconductor Corporation FAN48623 * Rev. 1.9 www.fairchildsemi.com FAN48623 -- 2500 mA Synchronous TinyBoost(R) Regulator with Bypass Mode January 2016 Q3B Q3A VIN CIN Q3 L1 BYPASS CONTROL Q1B Q1A SW VOUT COUT Q1 Q2 Synchronous Rectifier Control GND VSEL EN MODULATOR LOGIC AND CONTROL BYP PG Figure 2. Table 1. Block Diagram Recommended Components Component Description Vendor L1 0.47 H, 20%, 5.3 A, 2520 Toko: DFE252010P-R47M CIN 10 F, 20%, 10 V, X5R, 0603 COUT 2 x 22 F, 20%, 10 V, X5R, 0603 (c) 2013 Fairchild Semiconductor Corporation FAN48623 * Rev. 1.9 Parameter Typ. Unit L 0.47 H DCR (Series R) 27 m TDK: C1608X5R1A106M C 10 F TDK: C1608X5R1A226M080AC C 44 F www.fairchildsemi.com 2 FAN48623 -- 2500 mA Synchronous TinyBoost(R) Regulator with Bypass Mode Typical Application EN PG A1 A2 VSEL NC B1 B2 BYP NC C1 C2 AGND D1 Figure 3. VIN A4 A3 A2 A1 B4 B4 B3 B2 B1 C4 C4 C3 C2 C1 D4 D4 D3 D2 D1 A4 A3 VOUT B3 SW C3 PGND D2 D3 Top-Through View (Bumps Down) Figure 4. Bottom View (Bumps Up) Pin Definitions Pin # Name Description A1 EN Enable. When this pin is HIGH, the circuit is enabled. A2 PG Power Good. This is an open-drain output. PG is actively pulled LOW if output falls out of regulation due to overload or if thermal protection threshold is exceeded. A3, A4 VIN Input Voltage. Connect to Li-Ion battery input power source. B1 VSEL Output Voltage Select. When boost is running, this pin can be used to select the output voltage. B3, B4 VOUT Output Voltage. Place COUT as close as possible to the device. C1 BYP Bypass. This pin can be used to activate Forced Bypass Mode. When this pin is LOW, the bypass switches (Q3 and Q1) are turned on and the IC is otherwise inactive. C3, C4 SW Switching Node. Connect to inductor. D1 AGND Analog Ground. This is the signal ground reference for the IC. All voltage levels are measured with respect to this pin. AGND should be connected to PGND at a single point. D2 -- D4 PGND Power Ground. This is the power return for the IC. The COUT bypass capacitor should be returned with the shortest path possible to these pins. B2, C2 NC No Internal Connection. Note: Bumps are present and should be tied to PGND. (c) 2013 Fairchild Semiconductor Corporation FAN48623 * Rev. 1.9 www.fairchildsemi.com 3 FAN48623 -- 2500 mA Synchronous TinyBoost(R) Regulator with Bypass Mode Pin Configuration Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. Symbol VIN VOUT VSW Parameter Min. Max. Unit -0.3 6.5 V 6.0 V VIN Input Voltage VOUT Output Voltage SW Node Voltage DC -0.3 6.0 Transient: 10 ns, 3 MHz -1.0 8.0 Other Pins -0.3 6.5 Human Body Model, ANSI/ESDA/JEDEC JS-001-2012 2.0 Charged Device Model per JESD22-C101 1.5 (2) V V ESD Electrostatic Discharge Protection Level TJ Junction Temperature -40 +150 C TSTG Storage Temperature -65 +150 C +260 C TL kV Lead Soldering Temperature, 10 Seconds Note: 2. Lesser of 6.5 V or VIN + 0.3 V. Recommended Operating Conditions The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding them or designing to absolute maximum ratings. Symbol Parameter VIN Supply Voltage IOUT Output Current Min. Max. Unit 2.5 4.5 V 0 2500 mA TA Ambient Temperature -40 +85 C TJ Junction Temperature -40 +125 C Thermal Properties Junction-to-ambient thermal resistance is a function of application and board layout. This data is measured with four-layer Fairchild evaluation boards (1 oz copper on all layers). Special attention must be paid not to exceed junction temperature TJ(max) at a given ambient temperate TA. Symbol JA Parameter Junction-to-Ambient Thermal Resistance (c) 2013 Fairchild Semiconductor Corporation FAN48623 * Rev. 1.9 Typical Unit 60 C/W www.fairchildsemi.com 4 FAN48623 -- 2500 mA Synchronous TinyBoost(R) Regulator with Bypass Mode Absolute Maximum Ratings Unless otherwise noted and per Figure 1 minimum and maximum values are from VIN=2.5 V to 4.5 V and TA=-40C to +85C. Typical values are at VIN = 3.0 V and TA = 25C for all output voltage options. Symbol IQ Parameter VIN Quiescent Current Conditions Min. Typ. Max. Unit Automatic Bypass Mode, VOUT_TARGET =3.3 V, VIN=3.6 V 140 190 A Boost Mode, VOUT=3.3 V, VIN=3.0 V 135 180 A Shutdown, EN=0 V, VIN=3.0 V 4.0 12.0 A Forced Bypass Mode, VIN=3.6 V 6.0 12.0 A ILK VOUT to VIN Reverse Leakage VOUT=5.0 V, EN=0 V, VIN=0 V 0.5 1.0 A ILK_OUT VIN to VOUT Leakage Current VOUT=0 V, EN=0 V, VIN=4.2 V 0.1 1.5 A VUVLO Under-Voltage Lockout VIN Rising 2.20 2.35 VUVLO_HYS Under-Voltage Lockout Hysteresis VIH Logic Level High EN, VSEL, BYP VIL Logic Level Low EN, VSEL, BYP RLOW IPD 200 V mV 1.05 V 0.4 V Logic Control Pin Pull Downs (LOW Active) BYP, VSEL, EN 300 k Weak Current Source Pull-Down BYP, VSEL, EN 100 nA 2.5 V VIN VOUT_TARGET -100 mV, DC, 0 to 2500 mA -1.0 4.0 % 2.5 V VIN VOUT_TARGET -100 mV, DC, PWM (CCM) Operation -1.0 2.5 % Boost Valley Current Limit VIN=2.5 V, VOUT=3.3 V 4.7 IV_LIM_SS Boost Valley Current Limit During Soft Start tSS Soft-Start EN HIGH to Regulation tRST FAULT Restart Timer VREG IV_LIM Output Voltage Accuracy 5.3 A VIN=2.5 V, VOUT=3.3 V 2.6 A 50 Load, VOUT_TARGET = 3.3 V (Time from EN Rising Edge to 90% of VOUT_TARGET) 300 s 20 ms Note: 3. Minimum and Maximum limits are verified by design, test, or statistical analysis. Typical (Typ.) numbers are not verified, but represent typical results. (c) 2013 Fairchild Semiconductor Corporation FAN48623 * Rev. 1.9 www.fairchildsemi.com 5 FAN48623 -- 2500 mA Synchronous TinyBoost(R) Regulator with Bypass Mode Electrical Specifications 98% 98% 96% 96% 94% 94% Efficiency Efficiency Unless otherwise specified, TA = 25C; circuit and components according to Figure 1. 92% 92% 90% 90% -40C 2.5 VIN 88% 88% 2.7 VIN +25C +85C 3.0 VIN 86% 86% 0 500 1000 1500 2000 0 2500 500 1500 2000 2500 Load Current (mA) Load Current (mA) Figure 5. 1000 Efficiency vs. Load Current and Input Voltage, VOUT=3.15 V Figure 6. Efficiency vs. Load Current and Temperature, VIN=3.0 V, VOUT=3.15 V 98% 98% 96% 96% 94% Efficiency Efficiency 94% 92% 90% 88% 92% 90% 86% -40C 2.5 VIN 84% 88% 2.7 VIN +25C 3.0 VIN +85C 82% 86% 0 500 1000 1500 2000 2500 0 500 Load Current (mA) Figure 7. 1000 1500 2000 2500 Load Current (mA) Efficiency vs. Load Current and Input Voltage, VOUT=3.3 V Figure 8. Efficiency vs. Load Current and Temperature, VIN=3.0 V, VOUT=3.3 V 98% 98% 96% 96% 94% Efficiency Efficiency 94% 92% 90% 88% 92% 90% 2.5 VIN 2.7 VIN 3.0 VIN 3.3 VIN 86% 84% -40C 88% +25C +85C 82% 86% 0 500 1000 1500 2000 2500 0 Load Current (mA) Figure 9. 1000 1500 2000 2500 Load Current (mA) Efficiency vs. Load Current and Input Voltage, VOUT=3.5 V (c) 2013 Fairchild Semiconductor Corporation FAN48623 * Rev. 1.9 500 Figure 10. Efficiency vs. Load Current and Temperature, VIN=3.0 V, VOUT=3.5 V www.fairchildsemi.com 6 FAN48623 -- 2500 mA Synchronous TinyBoostTM Regulator with Bypass Mode Typical Characteristics Unless otherwise specified, TA = 25C; circuit and components according to Figure 1. 96% 96% 94% 94% 92% 92% Efficiency Efficiency 90% 88% 86% 90% 88% 84% 2.5 VIN 82% -40C 3.0 VIN 86% +25C 3.6 VIN 80% +85C 4.2 VIN 78% 84% 0 500 1000 1500 2000 2500 0 500 Load Current (mA) Figure 11. 1000 1500 2000 Efficiency vs. Load Current and Input Voltage, VOUT=5.0 V Figure 12. Efficiency vs. Load Current and Temperature, VIN=3.6 V, VOUT=5.0 V 4.0% 4.0% 2.5 VIN +25C 3.0% 3.0 VIN Output Regulation Output Regulation -40C 2.7 VIN 3.0% 2.0% 1.0% 0.0% -1.0% +85C 2.0% 1.0% 0.0% -1.0% -2.0% -2.0% 0 500 1000 1500 2000 0 2500 500 Figure 13. 1000 1500 2000 2500 Load Current (mA) Load Current (mA) Output Regulation vs. Load Current and Input Voltage, VOUT=3.15 V Figure 14. Output Regulation vs. Load Current and Temperature, VIN=3.0 V, VOUT=3.15 V 4.0% 4.0% -40C 2.5 VIN 2.7 VIN 3.0% +25C 3.0% 3.0 VIN Output Regulation Output Regulation 2500 Load Current (mA) 2.0% 1.0% 0.0% -1.0% +85C 2.0% 1.0% 0.0% -1.0% -2.0% -2.0% 0 500 1000 1500 2000 2500 0 Load Current (mA) Figure 15. 1000 1500 2000 2500 Load Current (mA) Output Regulation vs. Load Current and Input Voltage, VOUT=3.3 V (c) 2013 Fairchild Semiconductor Corporation FAN48623 * Rev. 1.9 500 Figure 16. Output Regulation vs. Load Current and Temperature, VIN=3.0 V, VOUT=3.3 V www.fairchildsemi.com 7 FAN48623 -- 2500 mA Synchronous TinyBoostTM Regulator with Bypass Mode Typical Characteristics (Continued) Unless otherwise specified, TA = 25C; circuit and components according to Figure 1. 4.0% 4.0% 2.5 VIN 2.7 VIN 3.0 VIN 3.3 VIN +25C 3.0% +85C Output Regulation Output Regulation 3.0% -40C 2.0% 1.0% 0.0% -1.0% 2.0% 1.0% 0.0% -1.0% -2.0% -2.0% 0 500 1000 1500 2000 2500 0 500 Load Current (mA) Figure 17. 1000 1500 2000 2500 Load Current (mA) Output Regulation vs. Load Current and Input Voltage, VOUT=3.5 V Figure 18. Output Regulation vs. Load Current and Temperature, VIN=3.0 V, VOUT=3.5 V 4.0% 4.0% 2.5 VIN 3.0% +25C 3.0% 3.6 VIN Output Regulation Output Regulation -40C 3.0 VIN 4.2 VIN 2.0% 1.0% 0.0% -1.0% +85C 2.0% 1.0% 0.0% -1.0% -2.0% -2.0% 0 500 1000 1500 2000 2500 0 500 Load Current (mA) Figure 19. 1000 1500 Output Regulation vs. Load Current and Input Voltage, VOUT=5.0 V 2500 Figure 20. Output Regulation vs. Load Current and Temperature, VIN=3.6 V, VOUT=5.0 V 220 200 -40C -40C +25C +25C 200 Quiescent Current (uA) 180 Quiescent Current (uA) 2000 Load Current (mA) +85C 160 140 +85C 180 160 140 120 120 100 2.5 3.0 3.5 4.0 2.5 4.5 Figure 21. Quiescent Current vs. Input Voltage and Temperature, VOUT=3.15 V, Auto Bypass (c) 2013 Fairchild Semiconductor Corporation FAN48623 * Rev. 1.9 3.0 3.5 4.0 4.5 5.0 5.5 Input Voltage (V) Input Voltage (V) Figure 22. Quiescent Current vs. Input Voltage and Temperature, VOUT=5.0 V, Auto Bypass www.fairchildsemi.com 8 FAN48623 -- 2500 mA Synchronous TinyBoostTM Regulator with Bypass Mode Typical Characteristics (Continued) Unless otherwise specified, TA = 25C; circuit and components according to Figure 1. 5 12 -40C Max Continuous Load (A) +85C Quiescent Current (uA) 4.5 3.3VOUT, 25C 4 3.3VOUT, 60C +25C 10 8 6 4 3.3VOUT, 85C 3.5 5.0VOUT, 25C 5.0VOUT, 60C 3 5.0VOUT, 85C 2.5 5.2VOUT, 25C 2 5.2VOUT, 60C 5.2VOUT, 85C 1.5 1 2 0.5 0 0 2.5 3.0 3.5 4.0 4.5 2.5 3.0 3.5 4.0 4.5 Input Voltage (V) Input Voltage (V) Figure 23. Quiescent Current vs. Input Voltage and Temperature, VOUT=3.3 V, Forced Bypass Figure 24. Typical Maximum Continuous Load vs. Input Voltage, Temperature and Output Voltage 40 2,500 2,000 Frequency(kHz) Ripple (mV) 30 20 10 2.5 VIN 1,500 1,000 2.5 VIN 500 2.7 VIN 2.7 VIN 3.0 VIN 3.0 VIN 0 0 0 500 1000 1500 2000 2500 0 500 Figure 25. 1000 1500 2000 2500 Load Current (mA) Load Current (mA) Output Ripple vs. Load Current and Input Voltage, VOUT=3.15 V Figure 26. Frequency vs. Load Current and Input Voltage, VOUT=3.15 V 40 2,500 2,000 Frequency(kHz) Ripple (mV) 30 20 1,500 1,000 2.5 VIN 10 2.5 VIN 2.7 VIN 500 3.0 VIN 2.7 VIN 3.0 VIN 0 0 0 500 1000 1500 2000 2500 0 Figure 27. Output Ripple vs. Load Current and Input Voltage, VOUT=3.3 V (c) 2013 Fairchild Semiconductor Corporation FAN48623 * Rev. 1.9 500 1000 1500 2000 2500 Load Current (mA) Load Current (mA) Figure 28. Frequency vs. Load Current and Input Voltage, VOUT=3.3 V www.fairchildsemi.com 9 FAN48623 -- 2500 mA Synchronous TinyBoostTM Regulator with Bypass Mode Typical Characteristics (Continued) Unless otherwise specified, TA = 25C; circuit and components according to Figure 1. 3,000 50 2.5 VIN 3.0 VIN 3.6 VIN 4.2 VIN 2,500 Frequency(kHz) Ripple (mV) 40 30 20 10 2,000 1,500 2.5 VIN 1,000 3.0 VIN 3.6 VIN 500 4.2 VIN 0 0 0 500 1000 1500 2000 0 2500 500 Figure 29. 1000 1500 2000 2500 Load Current (mA) Load Current (mA) Output Ripple vs. Load Current and Input Voltage, VOUT=5.0 V Figure 30. Frequency vs. Load Current and Input Voltage, VOUT=5.0 V VOUT (2V/div) VOUT (1V/div) IIN (500mA/div) IIN (500mA/div) EN (2V/div) EN (2V/div) 100s/div PG (5V/div) Figure 31. 100s/div PG (5V/div) Startup, 50 Load, VIN=2.5 V, VOUT=3.15 V Figure 32. Startup, 50 Load, VIN=3.0 V, VOUT=5.0 V VOUT (1V/div) IL (2A/div) IL (2A/div) VOUT (1V/div) PG (2V/div) 5ms/div 50s/div PG (2V/div) Figure 33. Overload Protection, VIN=3.0 V, VOUT=5.0 V (c) 2013 Fairchild Semiconductor Corporation FAN48623 * Rev. 1.9 Figure 34. Output Fault, VIN=3.0 V, VOUT=3.3 V www.fairchildsemi.com 10 FAN48623 -- 2500 mA Synchronous TinyBoostTM Regulator with Bypass Mode Typical Characteristics (Continued) Unless otherwise specified, TA = 25C; circuit and components according to Figure 1 VOUT (200mV/div) VOUT (200mV/div) 3.3V 5.0V IOUT (1A/div) IOUT (1A/div) 100s/div 100s/div Figure 35. Load Transient, 150-2000 mA, 10 s Edge, VIN=3.0 V, VOUT=3.3 V Figure 36. Load Transient, 150-1000 mA, 10 s Edge, VIN=3.6 V, VOUT=5.0 V VOUT (50mV/div) VOUT (200mV/div) 3.2V VIN(200mV/div) 2.7V 3.0V VIN(200mV/div) 20s/div 20s/div Figure 37. Line Transient, 3.0-3.6 VIN, 10 s Edge, 500 mA Load, VOUT=3.3 V Figure 38. Line Transient, 2.7-3.0 VIN, 10 s Edge, 500 mA Load, VOUT=3.3 V VOUT (100mV/div) 3.3V VSEL (2V/div) 20s/div Figure 39. VSEL Step, VIN=3 V, VOUT=3.3 V, 500 mA Load (c) 2013 Fairchild Semiconductor Corporation FAN48623 * Rev. 1.9 www.fairchildsemi.com 11 FAN48623 -- 2500 mA Synchronous TinyBoostTM Regulator with Bypass Mode Typical Characteristics (Continued) FAN48623 is a synchronous boost regulator, typically operating at 2.5 MHz in Continuous Conduction Mode (CCM), which occurs at moderate to heavy load current and low VIN voltages. At light load, the regulator operates at Discontinuous Conduction Mode (DCM) to maintain high efficiency. with boost valley current limited to 50% of nominal level at Boost Mode. FAN48623 uses a current-mode modulator to achieve excellent transient response and smooth transitions between CCM and DCM operation. Boost Mode (BST) The regulator includes a Bypass Mode that automatically activates when VIN is above the boost regulator's set point. If VIN is above VOUT_TARGET when the SS Mode successfully completes, the device transitions directly to BPS Mode. Table 2. Table 4. During SS Mode, VOUT is ramped up by stepping the internal reference. If VOUT fails to reach the voltage required during the SS ramp sequence within 64 s, a fault state is declared. This is a normal operating state of the regulator. Bypass Mode (BPS) Operating States Mode Description Invoked When LIN Linear Startup VIN > VOUT SS Soft-Start Mode VIN <VOUT < VOUT_TARGET BST Boost Operating Mode VOUT = VOUT_TARGET BPS Bypass Mode VIN > VOUT_TARGET EN 0 1 EN and BYP Logic Table BYP Mode VOUT 0 Shutdown 0 1 Shutdown 0 0 Forced Bypass VIN 1 Auto Bypass VOUT_TARGET or VIN (if VIN > VOUT_TARGET) Startup and Shutdown (EN Pin) FAULT State If EN is LOW, all bias circuits are off and the regulator is in Shutdown Mode. During shutdown, current flow is prevented from VIN to VOUT, as well as reverse flow from VOUT to VIN. During startup, keep DC current draw below 500 mA until the device successfully executes startup. It is recommended not to connect EN directly to VIN but use a GPIO voltage of 1.8 V to set the logic for the EN pin. The following table describes the startup sequence. The regulator enters the FAULT state under any of the following conditions: Table 3. Boost Startup Sequence Start Mode Entry LIN1 LIN2 SS Exit VIN > VUVLO, VOUT > VIN-300 mV EN=1 TIMEOUT LIN2 SS TIMEOUT FAUL T VOUT=VOUT_TARGET BST VOUT fails to achieve the voltage required to advance from LIN state to SS state. VOUT fails to achieve the voltage required to advance from SS state to BST state. Boost valley current limit triggers for 2 ms during the BST state. VIN to VOUT voltage drop exceeds 160 mV during BPS state. SS VOUT > VIN-300 mV LIN1 Exit LIN1 or LIN2 Exit End Timeout Mode (s) 512 VIN < VUVLO If a fault is triggered, the regulator stops switching and presents a high-impedance path between VIN and VOUT. After waiting 20 ms, an automatic restart is attempted. 1024 Power Good Power good is defined as a 0-FAULT, 1-POWER GOOD, open-drain output. The Power Good pin (PG) signals when the regulator has successfully completed soft-start with no faults occurring. Power Good also functions as a warning flag for high die temperature. Linear Startup (LIN) When EN is HIGH and VIN > VUVLO, the regulator attempts to bring VOUT within 300 mV of VIN using the internal fixed current source from VIN (Q3). The current is limited to the LIN1 (~1 A) set point. If VOUT reaches VIN-300 mV during LIN1 Mode, SS Mode is initiated. Otherwise, LIN1 times out after 512 s and LIN2 Mode is entered. PG is released HIGH when the soft-start sequence is successfully completed. Any FAULT state causes PG to be de-asserted. PG is not asserted during Forced Bypass exit to Boost Mode until the soft-start sequence is successfully completed. In LIN2 Mode, the current source is incremented to approximately 2 A. If VOUT fails to reach VIN-300 mV after 1024 s, a fault state is declared. Soft-Start Mode (SS) Upon successful completion of the LIN Mode (VOUT>VIN300 mV), SS Mode begins and the regulator starts switching (c) 2013 Fairchild Semiconductor Corporation FAN48623 * Rev. 1.9 www.fairchildsemi.com 12 FAN48623 -- 2500 mA Synchronous TinyBoostTM Regulator with Bypass Mode Circuit Description Forced Bypass When the die temperature exceeds 125C, PG de-asserts and the output remains regulated. PG is re-asserted when the device cools by approximately 20C. The regulator shuts down if the die temperature exceeds 150C. Restart occurs when the IC has cooled by approximately 20C. Forced Bypass Mode is activated by pulling BYP pin LOW. Forced Bypass Mode initiates with a current limit on Q3 and then proceeds to the Bypass Mode with both Q1 and Q3 fully enhanced. To prevent reverse current to the battery, the device waits until output discharges below VIN before entering Forced Bypass Mode. Automatic Bypass After the transition is complete, most of the internal circuitry is disabled to minimize quiescent current. OCP, UVLO and OTP are inactive in Forced Bypass Mode. In normal operation, the device automatically transitions from Boost Mode to Bypass Mode if VIN goes above VOUT_TARGET. In Bypass Mode, the device fully enhances both Q1 and Q3 to provide a very low impedance path from VIN to VOUT. Entry into the Bypass Mode is triggered when VIN > VOUT_TARGET and no switching has occurred during the past 10 s. To soften the entry into Bypass Mode, Q3 is driven as a linear current source for the first 5 s. Bypass Mode exit is triggered when VOUT reaches VOUT_TARGET. During Automatic Bypass Mode, the device is short-circuit protected by voltage comparator tracking the voltage drop from VIN to VOUT; if the drop exceeds 160 mV, a fault state is declared. By pulling BYP pin HIGH, the part transitions from Forced Bypass Mode to Boost Mode. During the transition, Q1 is off and Q3 is driven as a linear current source for the first 5 s before entering Boost Mode. . With sufficient load to enforce CCM operation, the Bypass Mode to Boost Mode transition occurs at the target V OUT. The Bypass Mode exit threshold has a 50 mV hysteresis imposed at VOUT to prevent cycling between modes. The corresponding input voltage at the transition point is: VIN VOUT ILOAD (DCRL RDS( ON)P ) || RDS( ON)BYP 50mV (1) The Bypass Mode entry threshold has a 30 mV hysteresis imposed at VOUT to prevent cycling between modes. The transition from Boost Mode to Bypass Mode occurs at the target VOUT+30 mV. The corresponding input voltage is: VIN VOUT ILOAD (DCRL RDS( ON)P ) 30mV (c) 2013 Fairchild Semiconductor Corporation FAN48623 * Rev. 1.9 (2) www.fairchildsemi.com 13 FAN48623 -- 2500 mA Synchronous TinyBoostTM Regulator with Bypass Mode Over-Temperature Output Voltage Ripple Output Capacitance (COUT) Output voltage ripple is inversely proportional to C OUT. During tON, when the boost switch is on, all load current is supplied by COUT. Output ripple is calculated as: Stability (4) The effective capacitance (CEFF ) of small, high-value, ceramic capacitors decrease as bias voltage increases, as illustrated in Figure 40. VRIPPLE ( P P ) tON 24 (3) and V tON tSW D tSW 1 IN V OUT therefore: 20 Capacitance (uF) ILOAD COUT 16 V VRIPPLE ( P P ) tSW 1 IN VOUT 12 8 (4) ILOAD COUT (5) and 4 tSW 0 0 1 2 3 4 5 6 7 8 9 10 (6) As can be seen from Equation (5), the maximum VRIPPLE occurs when VIN is at minimum and ILOAD is at maximum. DC Bias(V) Figure 40. CEFF for 22 F, 0603, X5R, 10 V-Rated Capacitor (TDK C1608X5R1A226M080AC) Voltage at VOUT For applications where a foreign voltage source could be applied at VOUT, care should be taken to ensure VOUT never exceeds the Absolute Maximum Rating. Stable operation is guaranteed with the minimum value of CEFF (CEFF(MIN)), as outlined in Table 5. Table 5. 1 fSW Minimum CEFF Required for Stability Layout Recommendations Operating Conditions CEFF(MIN) (F) The layout recommendations below highlight various layers using different colors. 0 to 2500 9 0 to 2500 6 To minimize spikes at VOUT, COUT must be placed as close as possible to PGND and VOUT, as shown in Figure 41. VOUT (V) ILOAD (mA) 3.15 5.0 For thermal reasons, it is suggested to maximize the pour area for all planes other than SW. Especially the ground pour should be set to fill all available PCB surface area and tied to internal layers with a cluster of thermal vias. Note: 4. CEFF varies with manufacturer, material, and case size. Inductor Selection Recommended nominal inductance value is 0.47 H. The FAN48623 employs valley-current limiting. Peak inductor current can reach 6.5 A for a short duration during overload conditions. Saturation effects cause the inductor current ripple to become higher under high loading as only the valley of the inductor current ripple is controlled. Startup Inrush Current Limit Input current limiting is in effect during soft-start, which limits the current available to charge COUT and any additional capacitance on the VOUT line. If the output fails to achieve regulation within the set limit, a FAULT occurs, causing the circuit to shut down then restart after 20 ms. If the total combined output capacitance is very high, the circuit may not start on the first attempt, but eventually achieves regulation if no load is present. If a high-current load and high capacitance are both present during soft-start, the circuit may fail to achieve regulation and continually attempts softstart, only to have the output capacitance discharged by the load when in a FAULT state. (c) 2013 Fairchild Semiconductor Corporation FAN48623 * Rev. 1.9 Figure 41. Layout Recommendation Refer to the section below recommendations for each layer. for detailed layout www.fairchildsemi.com 14 FAN48623 -- 2500 mA Synchronous TinyBoostTM Regulator with Bypass Mode Application Information Connect AGND directly to GND layer through a via. VOUT trace should be as wide and as short as possible, for low impedance. The ground area should be made as large as possible to help dissipate heat. Put as many as possible vias connected to ground plane(layer 2), to help dissipate heat. Figure 42. Top Layer Figure 43. Layer 2 should be a solid ground layer, to shield VOUT from capacitive coupling of the fast edges of SW node. Logic signals can be routed on this layer. Layer 2 SW trace should be as wide and as short as possible, and be isolated with GND area from any other sensitive traces. Figure 44. (c) 2013 Fairchild Semiconductor Corporation FAN48623 * Rev. 1.9 Layer 3 www.fairchildsemi.com 15 FAN48623 -- 2500 mA Synchronous TinyBoostTM Regulator with Bypass Mode VIN trace should go through CIN before going to VIN pins. Product D E X Y FAN48623UC315X 1.810 0.030 1.810 0.030 0.305 0.305 FAN48623UC32JX 1.810 0.030 1.810 0.030 0.305 0.305 FAN48623UC33X 1.810 0.030 1.810 0.030 0.305 0.305 FAN48623UC35X 1.810 0.030 1.810 0.030 0.305 0.305 FAN48623UC36FX 1.810 0.030 1.810 0.030 0.305 0.305 FAN48623UC50X 1.810 0.030 1.810 0.030 0.305 0.305 FAN48623UC50GX 1.810 0.030 1.810 0.030 0.305 0.305 (c) 2013 Fairchild Semiconductor Corporation FAN48623 * Rev. 1.9 www.fairchildsemi.com 16 FAN48623 -- 2500 mA Synchronous TinyBoostTM Regulator with Bypass Mode Product-Specific Dimensions ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries. ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor's product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf. 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