A4990: Automotive Dual Full Bridge Driver

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The A4990 is a dual full-bridge driver for stepper motors and small brush DC motors in automotive applications. Each full bridge uses DMOS power devices with integrated freewheeling diodes. Control circuits prevent cross-conduction, or shoot-through, when switching between high-side and low-side drives.

This device drives stepper motors with full current in either direction in each phase, allowing two-phase on, full-step operation. It drives DC motors in both directions and has brake capability. A single input turns-off both bridges, allowing motors to coast. All control modes can be achieved using 3, 4, or 5 outputs from a standard parallel interface of a microcontroller.

The peak motor current can be limited by sense resistor selection, providing higher efficiency, reduced motor heating, and longer motor life.

The outputs are protected from short circuits to supply and to ground, and low load-current detection is included. Chip level protection includes: overtemperature shutdown, and overvoltage and undervoltage lockout.

The A4990 is supplied in a 20-lead TSSOP power package with an exposed thermal pad (package type LP). This package is lead (Pb) free with 100% matte tin lead frame plating.

  • Two full bridge power outputs
  • Typical application up to ±800 mA, 28 V
  • Adjustable peak current limit control
  • Minimum overcurrent shutdown at 1.4 A
  • Continuous operation at high ambient temperature
  • Synchronous rectification for low power dissipation
  • Simple parallel interface control
  • Inverted and non-inverted inputs
  • No crossover current
  • Low current consumption in sleep mode
  • Error flag diagnostics
  • Open load diagnostic during on-state for all outputs
  • Outputs protected against overcurrent
  • Overtemperature protection with hysteresis
  • Overvoltage and undervoltage lockout
  • 3.3 V / 5 V compatible inputs with hysteresis
  • Thermally enhanced package (exposed pad)
  • Fully integrated in a compact TSSOP package for space sensitive applications

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Part Composition /
RoHS Data
Comments Samples Check Stock
APEK4990KLP-01-T DEMO BOARD -20°C to 85°C No -- Contact your
local sales rep
Distributor Stock
A4990KLPTR-T 20-lead TSSOP -40°C to 125°C Yes View Data Contact your
local sales rep
Distributor Stock

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.



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