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A4402 Datasheet(PDF) 2 Page - Allegro MicroSystems |
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A4402 Datasheet(HTML) 2 Page - Allegro MicroSystems |
2 / 15 page Constant On-Time Buck Converter with Integrated Linear Regulator A4402 2 Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com Pin-out Diagram Absolute Maximum Ratings Characteristic Symbol Notes Rating Units VIN1 Pin VIN1 –0.3 to 50 V VIN2 Pin VIN2 –0.3 to 7 V LX Pin VLX –1 to 50 V ISEN Pin VISEN –0.5 to 1 V ENB Pin VENB –0.3 to 7 V VO2 Pin VO2 –0.3 to 7 V WDI Pin VWDI –0.3 to 6 V TON Pin VTON –0.3 to 7 V FB1 and FB2 Pins VFBx –0.3 to 7 V NPOR VNPOR –0.3 to 6.5 V Ambient Operating Temperature TA Range E –40 to 85 °C Junction Temperature Tj(max) 150 °C Storage Temperature Range Tstg –40 to 150 °C Selection Guide Part Number Packing Package A4402ELPTR-T 4000 pieces per 13-in. reel 16-pin TSSOP with exposed thermal pad Thermal Characteristics Characteristic Symbol Test Conditions* Value Units Package Thermal Resistance RθJA On 4-layer PCB based on JEDEC standard 34 ºC/W *Additional thermal information available on the Allegro website. 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 |
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