Worcester, Mass.—Allegro's A3995 DMOS full-bridge PWM motor driver, for the office automation and industrial markets, provides up to 2.4 amps per output for independently driving two DC motors.

Also announced, the A3989 is designed to drive one bipolar step motor at up to 1.2 amps and one DC motor at up to 2.4 amps.

Providing a peak output of 36 volts, the A3995 includes two fixed off-time PWM current regulators that operate in either the fast- or slow-decay mode. The driver features synchronous rectification control circuitry to maintain high efficiency; and phase, enable, and mode inputs for controlling speed, torque, direction, and brake and coast functions. The chip includes thermal shutdown circuitry with hysteresis and under-voltage lockout and crossover current protection. Special power-up sequencing is not required.

The second chip, the A3989, is similarly designed for driving one bipolar stepper motor (full, half, and quarter steps) and one DC motor. This device contains two full-bridges for the stepper motor and a full-bridge for the DC motor.

Click here for the A3995 datasheet and here for the A3989 datasheet. Both the A3995 and A3989, in a Pb-free 6-by-6 mm, 36L QFN package with exposed power tab for enhanced thermal dissipation, are priced at $2.23 each in 1k pieces. Lead time is typically 12 weeks.

Allegro Microsystems, 1-508-853-5000, www.allegromicro.com