Approximate Scale 1:1

CPU

M

M

OUT1

IN4

IN3

A3901

+VBAT

OUT2

OUT3

OUT4

IN2

IN1

VBB

GND

10 µF

10 V

CPU

M

OUT1

IN4

IN3

A3901

+VBAT

OUT2

OUT3

OUT4

IN2

IN1

VBB

GND

10 µF

10 V

Figure 2. Typical dual dc motor control

Figure 3. Typical single dc motor control (paralleled outputs)

CPU

M

OUT1

IN4

IN3

A3901

+VBAT

OUT2

OUT3

OUT4

IN2

IN1

VBB

GND

10 µF

10 V

Figure 1. Typical stepper motor control

A3901

Description

The A3901 is a dual full-bridge motor driver, designed for low

voltage portable applications involving bipolar stepper or brush

dc motors. The outputs have been optimized for low voltage

drop, with currents up to ±400 mA (±800 mA with outputs

paralleled) and an operating voltage range of 2.5 to 5.5 V.

The four inputs (IN1 to IN4) can control a bipolar stepper motor

in full- or half-step mode, or dc motors in forward, reverse, or

brake mode. The inputs can be PWMed for current or speed

control at frequencies up to 250 kHz.

Internal protection circuitry includes thermal shut down (TSD)

and crossover (shoot-through) protection.

The A3901 is supplied in a 3 x 3 x 0.75 mm nominal, 10-lead

DFN/MLP package, with exposed thermal pad (package “EJ”).

This small footprint package is lead (Pb) free, with 100% matte

tin leadframe plating.

3901-DS

Features and Benefits

▪ 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)

Package: 10 Contact DFN/MLP (suffix EJ)

Typical Application

Dual Full Bridge Low Voltage Motor Driver