A5989: Bipolar Stepper and High-Current DC Motor Driver IC

The A5989 is designed to operate at voltages up to 40 V while driving one bipolar stepper motor at currents up to 1.6 A, and one DC motor at currents up to 3.2 A. The A5989 includes a fixed off-time pulsewidth 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), crossover-current and short-circuit protection. Special power-up sequencing is not required.

The A5989 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.


Astrorep Inc. (Allegro and Sanken Semiconductors, Sanken Power Supplies)
141 John Street, Suite 300
Babylon, NY 11702
Phone: (631)422-2500
Fax: (631)422-2504
Web: www.astrorepinc.com
Email: donna.tweedy@astrorepinc.com

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  • Features and BenefitsFeatures and Benefits
  • PackagingPackaging
  • Technical DocsTechnical Docs
  • NewsNews
  • 40 V output rating
  • 3.2 A DC motor driver
  • 1.6 A bipolar stepper driver
  • Synchronous rectification
  • Internal undervoltage lockout (UVLO)
  • Thermal shutdown circuitry
  • Crossover-current protection
  • Very thin profile QFN package
  • Overcurrent protection
  • Low-power sleep mode
  • 3.3 and 5 V compatible logic supply
A5989 Packages

Click the image to view larger
A5989 Product Image A5989 Typical Application A5989 Functional Block Diagram

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Part Composition /
RoHS Data
Comments Samples Check
Distributor Stock
A5989GEVTR-T 36-lead QFN -40°C to 105°C Yes View Data Contact your
local sales rep
Check Stock
APEK5989GEV-01-T DEMO BOARD -40°C to 105°C No -- Contact your
local sales rep
Check Stock
APEK5989SEV-01-WO DEMO BOARD -40°C to 105°C No -- Contact your
local sales rep
Check Stock

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