A3989| Datasheet

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A3989 Bipolar Stepper and High Current DC Motor Driver
Features and Benefits
36 V output rating 2.4 A dc motor driver 1.2 A bipolar stepper driver Synchronous rectification Internal undervoltage lockout (UVLO) Thermal shutdown circuitry Crossover-current protection Very thin profile QFN package

Description
The A3989 is designed operate at voltages up to 36 V while driving one bipolar stepper motor, at currents up to 1.2A, and one dc motor, at currents up to 2.4 A. The A3989 includes a fixed off-time pulse width modulation (PWM) regulator for current control. The stepper motor driver features dual 2-bit nonlinear DACs (digital-to-analog converters) that enable control in full, half, and quarter steps. The dc motor is controlled using standard PHASE and ENABLE signals. Fast or slow current decay is selected via the MODE pin. The PWM current regulator uses the Allegro patented mixed decay mode for reduced audible motor noise, increased step accuracy, and reduced power dissipation. Internal synchronous rectification control circuitry is provided to improve power dissipation during PWM operation. Protection features include thermal shutdown with hysteresis, undervoltage lockout (UVLO) and crossover current protection. Special power up sequencing is not required. The A3989 is supplied in a leadless 6 mm 6 mm 0.
9 mm, 36 pin QFN package with exposed power tab for enhanced thermal performance. The package is lead (Pb) free, with 100% matte tin leadframe plating.

Package: 36 pin QFN with exposed thermal pad 0.90 mm nominal height (suffix EV)

Approximate scale 1:1

0.1 F 50 V CP1 VDD

0.1 F 50 V CP2 VCP VBB VBB OUT1A OUT1B

100 F 50 V

0.22 F 50 V

PHASE1 I01 Microcontroller or Controller Logic I11 PHASE2 I02 I12 PHASE3 ENABLE MODE VREF1 VREF2 VREF3

SENSE1

A3989
OUT2A OUT2B SENSE2

OUT3A OUT3A OUT3B OUT3B SENSE3 GND GND SENSE3

Figure 1. Typical application circuit A3989DS, Rev. 1

A3989 Datasheet allegro Download PDF

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A3989 DATASHEET