A3901 Dual, Full-Bridge Low Voltage Motor Driver for Stepper, DC Motors
Description
The A3901 is a dual H-bridge low-voltage motor driver capable of operating one stepper motor or two DC motors. MOSFET output stages substantially reduce the voltage drop and the power dissipation of the outputs of the A3901 compared to typical drivers with bipolar transistors.
The A3901 is designed for portable applications with a power-off (sleep mode) current of 50 nA (typical) and an operating voltage range of 2.5 V to 5.5 V. Output current can be regulated by pulse width modulating (PWM) the inputs. Both H-bridges can be paralleled for higher current operation. Allegro’s A3901 offers a very small package size, low operating voltage, and low voltage drop MOSFET outputs. Internal circuit protection includes thermal shutdown with hysteresis, transient-suppression diodes, and crossover current protection.
The A3901 is supplied in a lead-free (100% matte tin leadframe) ten-lead MLP power package (3 x 3 x 0.75 mm) with an exposed thermal pad (suffix EJ).
Specs
- Low RDS(on) outputs
- Full- and half-stepping capability
- Small package
- Forward, reverse, and brake modes for dc motors
- Sleep mode with zero current drain
- PWM control up to 250 kHz
- Crossover-current protection
- Thermal shutdown (TSD)