A3908: Low Voltage DC Motor Driver

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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 sourceside 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 × 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.

  • 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

The A3908 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.

EE-DFN 8 lead with exposed pad

Part Number Specifications and Availability