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 × 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 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
