A3908: Low Voltage DC Motor Driver

Description

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.

Top 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

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check Stock
A3908EEETR-T 8-lead DFN -40°C to 85°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
APEK3908EEE-01-T DEMO BOARD -40°C to 85°C No -- Contact your
local sales rep
Check
Distributor Stock

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.

Packaging

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