A3906 Datasheet, PDF (1/10 Pages) Allegro MicroSystems – Low Voltage Stepper and Single/Dual DC Motor Driver

A3906
Low Voltage Stepper and Single/Dual DC Motor Driver
Features and Benefits
▪ 2.5 to 9 V operation
▪ Internal PWM current limit control
▪ Synchronous rectification for reduced power dissipation
▪ Peak current output flag
▪ Undervoltage lockout
▪ Low R_DS(on) outputs
▪ Small package
▪ Brake mode for DC motors
▪ Sleep function
▪ Crossover-current protection
▪ Thermal shutdown
Package: 20-contact QFN (suffix ES)
Approximate size
Description
Designed for pulse width modulated (PWM) control of low
voltage stepper motors, and single and dual DC motors, the
A3906 is capable of output currents up to 1 A per channel and
operating voltages from 2.5 to 9 V.
The A3906 has an internal fixed off-time PWM timer that
sets a peak current based on the selection of a current sense
resistor. An overcurrent output flag is provided that notifies
the user when the current in the motor winding reaches the
peak current determined by the sense resistor. The fault output
does not affect driver operation.
TheA3906 is provided in a 20-contact, 4 mm × 4 mm, 0.75 mm
nominal overall height QFN, with exposed pad for enhanced
thermal dissipation. It is lead (Pb) free, with 100% matte tin
leadframe plating.
Applications include the following:
▪ Digital still cameras (DSC)
▪ Cell phone cameras
▪ USB powered devices
▪ Battery powered devices
Typical Applications
+5 V
0.1 μF
0.1 μF
CP1 CP2 CP3 CP4
VCP
SLEEP
IN1
IN2
IN3
IN4
VBB
A3906
OUT1A
OUT1B
SENSE1
OUT2A
FL1
FL2
OUT2B
GND
SENSE2
0.1 μF
10 μF
10 V
M
M
+5 V
Dual DC motor application
3906-DS, Rev. 1
0.1 μF
0.1 μF
CP1 CP2 CP3 CP4
VCP
SLEEP
IN1
IN2
IN3
IN4
VBB
A3906
OUT1A
OUT1B
SENSE1
OUT2A
FL1
OUT2B
FL2
SENSE2
GND
0.1 μF
10 μF
10 V
M
Stepper motor application