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A3941 Datasheet Automotive Full Bridge MOSFET Driver

Manufacturer: Allegro MicroSystems

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General Description

The A3941 is a full-bridge controller for use with external N‑channel power MOSFETs and is specifically designed for automotive applications with high-power inductive loads, such as brush DC motors.

A unique charge pump regulator provides full (>10 V) gate drive for battery voltages down to 7 V and allows the A3941 to operate with a reduced gate drive, down to 5.5 V.

A bootstrap capacitor is used to provide the above-battery supply voltage required for N-channel MOSFETs.

Overview

A3941 Automotive Full Bridge MOSFET Driver.

Key Features

  • High current gate drive for N-channel MOSFET full bridge.
  • High-side or low-side PWM switching.
  • Charge pump for low supply voltage operation.
  • Top-off charge pump for 100% PWM.
  • Cross-conduction protection with adjustable dead time.
  • 5.5 to 50 V supply voltage range.
  • Integrated 5 V regulator.
  • Diagnostics output.
  • Low current sleep mode.

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