The A3903 is a low voltage bi-directional DC motor driver with input voltage range of 3 V 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 supply across the motor coil. This regulated output minimizes motor voltage change due to I*Rdson 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 shut down, under voltage lockout, and crossover (shoot-through) protection.

The A3903 is supplied in a 2 mm x 2 mm x 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.

• Adjustable constant voltage operation
  Compensates for supply voltage variation. Linear voltage control is ideal for applications that cannot tolerate noise issues associated with PWM control.
• Simple Interface and control - Standby/Forward/Reverse/Brake mode
  Reduces complexity of the total design and software.
• Minimal external components required - 2 resistors & 1 bypass cap
  Enables compact PCB surface and low total BOM
• Thermal shutdown, under-voltage and crossover protection
  Provides self-protection
• Less than 500 nA standby mode current
  Low standby current reduces battery drain and extends operating time.
• 3 V to 5.5 V operation
  Wide voltage range accommodates the majority of applications.
• 500mA Output Peak Rating
  Low RDSon allows for power dense design.
• 2 mm x 2 mm x 0.575 mm DFN package
  Smaller package offers unique flexibility for designs with small form factors.
• -40 to +85°C operating temperature range