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A3979 Datasheet Microstepping DMOS Driver

Manufacturer: Allegro MicroSystems

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General Description

The A3979 is a complete microstepping motor driver with built-in translator, designed as a pin-compatible replacement for the successful A3977, with enhanced microstepping (1/16 step) precision.

It is designed to operate bipolar stepper motors in full-, half-, quarter-, and sixteenth-step modes, with an output drive capacity of up to 35 V and ±2.5 A.

The A3979 includes a fixed off-time current regulator that has the ability to operate in Slow, Fast, or Mixed decay modes.

Overview

A3979 Microstepping DMOS Driver with Translator.

Key Features

  • ±2.5 A, 35 V output rating.
  • Low RDS(On) outputs: 0.28 Ω source, 0.22 Ω sink, typical.
  • Automatic current decay mode detection/selection.
  • 3.0 to 5.5 V logic supply voltage range.
  • Slow, Fast or Mixed current decay modes.
  • Home output.
  • Synchronous rectification for low power dissipation.
  • Internal UVLO and thermal shutdown circuitry.
  • Crossover-current protection.

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