Power Electronics

Low Voltage, Bi-Directional DC Motor Driver

Allegro® introduced the A3908, a new low voltage bi-directional DC motor driver with a typical input voltage range of 3.0 V to 5.5 V and output currents up to 500 mA. The unique full-bridge output incorporates source side linear operation to allow a constant voltage supply across the motor coil. This regulated output minimizes motor voltage change due to I×Rds(on) variation and battery voltage tolerance. Allegro's new motor driver is targeted at the portable and instrumentation markets.

Two logic inputs are provided to control the motor direction of rotation, brake and standby (<500 nA supply current) modes and to allow optional PWM of the sink drivers. Internal protection circuitry includes thermal shut down, under voltage lockout, and crossover (shoot through) protection.

The A3908 is supplied in a 2.0 mm × 2.0 mm × 0.575 mm nominal, 8-lead DFN package, with exposed thermal pad (package suffix "EE"). This small footprint package is lead (Pb) free, with 100% matte tin leadframe plating.

It is priced at $0.45 in quantities of 1,000 and has a 12 week typical lead-time to market.

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