A3901
Dual Full Bridge Low Voltage Motor Driver
Features and Benefits
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Low R
DS(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)
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.
Package: 10 Contact DFN/MLP (suffix EJ)
Approximate Scale 1:1
Typical Application
+VBAT
10 µF
10 V
IN1
IN2
CPU
IN3
IN4
OUT4
GND
VBB
OUT1
M
OUT2
A3901
OUT3
Figure 1. Typical stepper motor control
+VBAT
10 µF
10 V
IN1
IN2
CPU
IN3
IN4
OUT4
GND
GND
+VBAT
VBB
OUT1
10 µF
10 V
IN1
IN2
CPU
VBB
OUT1
M
OUT2
M
OUT2
A3901
OUT3
A3901
IN3
OUT3
IN4
OUT4
M
Figure 2. Typical dual dc motor control
3901-DS
Figure 3. Typical single dc motor control (paralleled outputs)
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