A4989 Datasheet, PDF(1/17 Page) Allegro MicroSystems – The A4989 is a dual full-bridge gate driver with integrated microstepping translator suitable for driving a wide range of higher power industrial bipolar 2-phase stepper motors (typically 30 to 500 W).

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A4989 Datasheet, PDF (1/17 Pages) Allegro MicroSystems – The A4989 is a dual full-bridge gate driver with integrated microstepping translator suitable for driving a wide range of higher power industrial bipolar 2-phase stepper motors (typically 30 to 500 W).

A4989

Dual Full-Bridge MOSFET Driver

with Microstepping Translator

Features and Benefits

âª 2-wire step and direction interface

âª Dual full-bridge gate drive for N-channel MOSFETs

âª Operation over 12 to 50 V supply voltage range

âª Synchronous rectification

âª Cross-conduction protection

âª Adjustable mixed decay

âª Integrated sinusoidal DAC current reference

âª Fixed off-time PWM current control

âª Enhanced low current control when microstepping

âª Pin compatible with the A3986

Package: 38 pin TSSOP (suffix LD)

Description

The A4989 is a dual full-bridge gate driver with integrated

microstepping translator suitable for driving a wide range of

higher power industrial bipolar 2-phase stepper motors (typically

30 to 500 W). Motor power is provided by external N-channel

power MOSFETs at supply voltages from 12 to 50 V.

This device contains two sinusoidal DACs that generate the

reference voltage for two separate fixed-off-time PWM current

controllers. These provide current regulation for external power

MOSFET full-bridges.

Motor stepping is controlled by a two-wire step and direction

interface, providing complete microstepping control at full-,

half-, quarter-, and sixteenth-step resolutions. The fixed-off

time regulator has the ability to operate in slow-, mixed-, or

fast-decay modes, which results in reduced audible motor noise,

increased step accuracy, and reduced power dissipation.

The translator is the key to the easy implementation of this

IC. Simply inputting one pulse on the STEP input drives the

motor one step (full, half, quarter, or sixteenth depending on

the microstep select input). There are no phase-sequence tables,

high frequency control lines, or complex interfaces to program.

This reduces the need for a complex microcontroller.

Approximate size

Continued on the next pageâ¦

Typical Application Diagram

4989-DS, Rev. 1

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