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Related Links:

Datasheets:
A3903: Low Voltage DC Motor Driver (PDF)

Selection Guides:
Power Integrated Circuits,

Power Motor Drivers,

Power Motor Drivers - Full-Bridge

when this product is updated

Press Releases:
A3903: Allegro Introduces a New Low Voltage, Bi-Directional DC Motor Driver in an Extremely Small 2.0 x 2.0 mm Package

A3903
Low Voltage DC Motor Driver

Features

• 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°C to 85°C operating temperature range

Applications

• Robotic actuators and pumps
• Portable printers/scanners
• Camera lens/shutter control
• Battery powered toys and games
• Low noise test instrumentation systems

Description

The A3903 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 × R_DS(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 A3903 is supplied in a 2 mm × 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.

Functional Block Diagram

Complete Part Numbers

Part Number	Package Type	RoHS Compliant	Part Composition/ RoHS Data	Temperature	Comments	Samples	Distributor Stock
A3903EEETR-T	8-lead DFN	Yes	view data	-40 °C to  85 °C	new	Due to warehouse relocation, samples will be unavailable until July 21, 2008. Contact your sales rep or purchase from distributor.

Allegro's products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system.