Low Voltage Stepper and Single/Dual DC Motor Driver
A3906
2
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Absolute Maximum Ratings
Characteristic Symbol Notes Rating Units
Load Supply Voltage V
BB
9.6 V
Logic Input Voltage Range V
IN
–0.3 to 7 V
Sense Voltage V
SENSEx
Continuous 0.5 V
Pulsed, t
w
< 1 μs1V
Output Current I
OUT
May be limited by duty cycle, ambient
temperature, and heat sinking. Under
any set of conditions, do not exceed
the specified current rating or a junction
temperature of 150°C.
Continuous 1 A
Peak, DC < 30% 1.5 A
Output Current in Paralleled
Operation
I
OUT(par)
Continuous 2 A
Peak, DC < 30% 2.5 A
Operating Temperature Range T
A
Range S –20 to 85 °C
Junction Temperature T
J(max)
150 °C
Storage Temperature Range T
stg
–40 to 150 °C
Selection Guide
Part Number Packing Package
A3906SESTR-T 1500 pieces per 7-in. reel 20-pin QFN with exposed thermal pad
Thermal Characteristics may require derating at maximum conditions, see application information
Characteristic Symbol Test Conditions* Value Units
Package Thermal Resistance
R
θJA
4-layer PCB based on JEDEC standard 37 ºC/W
*Additional thermal information available on the Allegro website.
Terminal List Table
Number Name Function
1 CP2 Charge pump capacitor terminal 2
2 GND Ground
3 SLEEP Sleep logic input, active low
4 IN1 Control input
5 IN2 Control input
6 IN3 Control input
7 IN4 Control input
8 FL1 Current limit flag, bridge 1
9 FL2 Current limit flag bridge 2
10 OUT2A DMOS full-bridge 2, output A
11 SENSE2 Current sense resistor terminal, bridge 2
12 OUT2B DMOS full-bridge 2, output B
13 VBB Supply Voltage
14 OUT1B DMOS full-bridge 1, output B
15 SENSE1 Current sense resistor terminal, bridge 1
16 OUT1A DMOS full-bridge 1, output A
17 VCP Reservoir capacitor terminal
18 CP3 Charge pump capacitor terminal 3
19 CP1 Charge pump capacitor terminal 1
20 CP4 Charge pump capacitor terminal 4
– PAD Exposed pad for enhanced thermal performance
PAD
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
CP4
CP1
CP3
VCP
OUT1A
IN3
IN4
FL1
FL2
OUT2A
SENSE1
OUT1B
VBB
OUT2B
SENSE2
CP2
GND
SLEEP
IN1
IN2
Pin-out Diagram
