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A3918 Datasheet Low Voltage DC Motor Driver

Manufacturer: Allegro MicroSystems

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General Description

Designed for pulse width modulated (PWM) control of a low voltage DC motor, the A3918 is capable of output currents up to 1.5 A and operating voltages from 2.5 to 9 V.

The A3918 has an internal fixed off-time PWM timer that sets a peak current based on the selection of a current sense resistor.

An overcurrent output flag is provided that notifies the user when the current in the motor winding reaches the peak current determined by the sense resistor.

Overview

A3918 Low Voltage DC Motor Driver.

Key Features

  • 2.5 to 9 V operation.
  • Internal PWM current control.
  • Synchronous rectification for reduced power dissipation.
  • Peak current output flag.
  • Undervoltage lockout.
  • Low RDS(on) outputs.
  • Small package.
  • Brake mode for DC motor.
  • Sleep function.
  • Crossover-current protection.
  • Thermal shutdown.

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