A4992 Automotive Stepper Motor Drive IC

By Allegro MicroSystems, LLC 88

A4992 Automotive Stepper Motor Drive IC

Allegro MicroSystems' A4992 is a flexible microstepping motor driver with integrated phase current control and a built-in translator for easy operation. It is a single-chip solution designed to operate bipolar stepper motors in full-, half-, quarter- and eighth-step modes, at up to 28 V. At power-on the A4992 is configured to drive most small stepper motors with simple-step and direction inputs.

The current regulator operates with fixed-frequency PWM and uses adaptive mixed-current decay to reduce audible motor noise and increase step accuracy.

The current in each phase of the motor is controlled through a DMOS full-bridge using synchronous rectification to improve power dissipation. Internal circuits and timers prevent cross conduction and shoot-through when switching between high and low-side drives.

Features and Benefits  
  • Low RDS(ON) outputs, 0.5 Ω source and sink (typ.)
  • Continuous operation at high ambient temperature
  • 3.5 V to 50 V supply operation
  • Adaptive mixed-current decay
  • Synchronous rectification for low-power dissipation
  • Internal over-voltage and under-voltage lockout
  • Hot warning and over-temperature shutdown
  • Crossover-current protection
  • Short-circuit and open-load diagnostics
  • Stall detect features
  • Configurable through serial interface

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