Description

The A3908 is a low voltage bidirectional DC motor driver with a typical input voltage range of 3 to 5.5 V and output currents up to 500 mA. The unique output full-bridge incorporates source side linear operation to allow a constant voltage across the motor coil. This regulated output minimizes motor voltage change due to I × RDS(on) variation and battery voltage tolerance.

Logic input pins 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 shutdown, undervoltage lockout, and crossover current (shoot-through) protection.

The A3908 is supplied in a 2 mm x 2 mm, 0.55 mm nominal height, 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.

Applications include:

▪ Robotic actuators and pumps

▪ Portable printers/scanners

▪ Camera lens/shutter control

▪ Battery powered toys and games

▪ Low noise test instrumentation systems

Features and Benefits

▪ Constant voltage operation (adjustable)

▪ 500 mA output peak rating

▪ Low power standby mode

▪ Small 2 mm × 2 mm, 0.55 mm nominal height DFN package

▪ Typical input voltage range of 3 to 5.5 V

▪ Adjustable constant voltage or PWM operation

▪ Less than 500 nA standby mode current

▪ –40 to 85 operating temperature range