A3901 Datasheet, PDF (1/11 Pages) Allegro MicroSystems – Dual Full Bridge Low Voltage Motor Driver

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