A3906SESTRT Allegro Micro Systems, Inc., A3906SESTRT Datasheet
A3906SESTRT
Manufacturer Part Number
A3906SESTRT
Description
QFN20
Manufacturer
Allegro Micro Systems, Inc.
Datasheet
1.A3906SESTRT.pdf
(10 pages)
Specifications of A3906SESTRT
Date_code
11+
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
▪ Small package
▪ Brake mode for DC motors
▪ Sleep function
▪ Crossover-current protection
▪ Thermal shutdown
Package: 20-contact QFN (suffix ES)
3906-DS, Rev. 2
+5 V
DS(on)
Low Voltage Stepper and Single/Dual DC Motor Driver
outputs
SLEEP
IN1
IN2
IN3
IN4
FL1
FL2
Dual DC motor application
CP1
0.1 μF
CP2
A3906
GND
CP3
0.1 μF
CP4
SENSE1
SENSE2
OUT1A
OUT1B
OUT2A
OUT2B
Approximate size
VCP
VBB
M
M
Typical Applications
0.1 μF
10 μF
10 V
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.
The A3906 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
+5 V
SLEEP
IN1
IN2
IN3
IN4
FL1
FL2
Stepper motor application
CP1
CP2
0.1 μF
A3906
GND
CP3
CP4
0.1 μF
SENSE1
SENSE2
OUT1A
OUT1B
OUT2A
OUT2B
VCP
VBB
A3906
0.1 μF
10 μF
10 V
M
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