Approximate Scale 1:1

A3908

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 source-

side linear operation to allow a constant voltage across the motor

coil. This regulated output minimizes motor voltage change due

Logic input pins are provided to control the motor direction of

rotation,brake,andstandby(<500nAsupplycurrent)modesand

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 x 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.

Applications include:

▪ Robotic actuators and pumps

▪ Portable printers/scanners

▪ Camera lens/shutter control

▪ Battery powered toys and games

▪ Low noise test instrumentation systems

3908-DS

Features and Benefits

▪ 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 to 85 operating temperature range

Package: 8 Contact DFN (suffix EE)

Typical Application

Low Voltage DC Motor Driver

CPU

R1

18 kΩ

R2

10 kΩ

M

OUTA

VSET

VREF

A3908

OUTB

IN2

IN1

VDD

GND