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
to I × R
DS(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 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
+V
BAT
OUTB
IN2
IN1
VDD
GND
