A3941 Automotive Full Bridge MOSFET Driver Features and Benefits Description High current gate drive for N-channel MOSFET full bridge The A3941 is a full-bridge controller for use with external High-side or low-side PWM switching N-channel power MOSFETs and is specifically designed for Charge pump for low supply voltage operation automotive applications with high-power inductive loads, such Top-off charge pump for 100% PWM as brush DC motors. Cross-conduction protection with adjustable dead time A unique charge pump regulator provides full (>10 V) gate 5.5 to 50 V supply voltage range drive for battery voltages down to 7 V and allows the A3941 Integrated 5 V regulator to operate with a reduced gate drive, down to 5.5 V. Diagnostics output Low current sleep mode A bootstrap capacitor is used to provide the above-battery supply voltage required for N-channel MOSFETs. An internal charge pump for the high-side drive allows DC (100% duty cycle) operation. Package: 28-pin TSSOP with exposed The full bridge can be driven in fast or slow decay modes using thermal pad (suffix LP) diode or synchronous rectification. In the slow decay mode, current recirculation can be through the high-side or the low- side FETs. The power FETs are protected from shoot-through by resistor adjustable dead time. Integrated diagnostics provide indication of undervoltage, overtemperature, and power bridge faults, and can be configured to protect the power MOSFETs under most short circuit conditions. The A3941 is supplied in a 28-pin TSSOP power package with Not to scale an exposed thermal pad (suffix LP). This package is lead (Pb) free, with 100% matte-tin leadframe plating. Typical Application VBAT PWM A3941 Direction Fault Flags 3941-DS, Rev. 5A3941 Automotive Full Bridge MOSFET Driver Selection Guide Part Number Packing A3941KLPTR-T 4000 pieces per reel Absolute Maximum Ratings* Characteristic Symbol Notes Rating Units Load Supply Voltage V 0.3 to 50 V BB Logic Inputs and Outputs 0.3 to 6.5 V V5 Pin 0.3 to 7 V LSS Pin 4 to 6.5 V VDSTH Pin 0.3 to 6.5 V SA and SB Pins 5 to 55 V VDRAIN Pin 5 to 55 V GHA and GHB Pins Sx to Sx+15 V GLA and GLB Pins 5 to 16 V CA and CB Pins 0.3 to Sx+15 V Operating Temperature Range T Range K 40 to 150 C A Junction Temperature T (max) 150 C J Overtemperature event not exceeding Transient Junction Temperature T 1 s, lifetime duration not exceeding 10 hr 175 C tJ guaranteed by design characterization Storage Temperature Range T 55 to 150 C stg ESD Rating, Human Body Model AEC-Q100-002, all pins 2000 V ESD Rating, Charged Device Model AEC-Q100-011, all pins 1050 V *With respect to GND. THERMAL CHARACTERISTICS may require derating at maximum conditions Characteristic Symbol Test Conditions* Value Units 4-layer PCB based on JEDEC standard 28 C/W R JA 2 Package Thermal Resistance 2-layer PCB with 3.8 in. of copper area each side 32 C/W R 2 C/W JP *Additional thermal information available on Allegro website. Allegro MicroSystems, Inc. 2 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000 www.allegromicro.com