Compact IC minimises voltage changes

Allegro MicroSystems' A3903 has a typical input voltage range of 3 to 5.5V and produces an output current up to 500mA.

The new A3903 from Allegro MicroSystems Europe is a low-voltage bidirectional DC motor driver IC in an ultra-compact package measuring only 2mm square and 0.55mm high.

It has a typical input voltage range of 3 to 5.5V and produces an output current up to 500mA.

The output uses a full-bridge circuit incorporating source-side linear operation to produce a constant voltage across the motor coil.

This regulated output minimises motor voltage changes caused by current variations and battery voltage fluctuations.

Logic input pins are provided to control the motor rotation, brake, and standby to allow optional pulse-width modulation of the sink drivers.

Internal circuitry includes thermal shutdown, undervoltage lockout and crossover current protection.

Typical applications include robotic actuators and pumps, portable printers and scanners, camera lens and shutter controls, battery-powered toys and games, and low-noise test instrumentation systems.

The A3903 is supplied in a 2 x 2 x 0.55mm eight-lead DFN package, with an exposed thermal pad.

This small footprint package is lead (Pb)-free, with 100% matt tin leadframe plating.

The operating temperature range is -40C to 85C.

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