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A4402 Datasheet(PDF) 3 Page - Allegro MicroSystems |
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A4402 Datasheet(HTML) 3 Page - Allegro MicroSystems |
3 / 17 page Constant On-Time Buck Converter With Integrated Linear Regulator A4402 3 Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com Functional Block Diagram ENB VO2 NPOR VFB2 Internal Regulator VIN1 ENB 1 3.3 V 250 mA VO2 FAULT TSD VIN2 L1 33 μH LX FB1 Switch PWM Control Switch Disable Boot Charge 10 VBAT FB2 VIN2 POR CPOR Soft Start Ramp Generator Watchdog Timer TSET CTSET VREF VREF VREF VSW VLIN 5V 0.1 ISEN VSW VREG VREG 0.01 4.7 20 VIN1 Rton 750 kΩ kΩ kΩ kΩ 4.7 kΩ kΩ kΩ WDI WDI 0.15 μF μF 0.33 R3 10 R4 5.62 R RSENSE 1 31.6 R2 9.76 GND GND μF μF μF μF μF Pin-out Diagram Terminal List Table Number Name Function 1 TON On time setting terminal 2 GND Ground 3 FB2 Feedback for VLIN 4 VIN2 Input voltage 2 5 VO2 Regulator 2 output 6 WDI Watchdog input 7 TSET Soft start and watchdog timing capacitor terminal 8 NPOR Fault output 9 FB1 Feedback for VSW 10 POR POR delay 11 ISEN Current sense, limit setting for switching regulator, connect to GND through series resistor 12 BOOT Boot node for LX 13 LX Switching regulator output 14 GND Ground 15 VIN1 Input voltage 1 16 ENB Enable input – PAD Exposed thermal pad TON GND FB2 VIN2 VO2 WDI TSET NPOR ENB VIN1 GND LX BOOT ISEN POR FB1 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 PAD |
Similar Part No. - A4402_12 |
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Similar Description - A4402_12 |
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