A3909
Dual Full Bridge Motor Driver
Description
Features and Benefits
• Low RDS(on) outputs
• Drives two DC motors or single stepper motor
• Low power standby (Sleep) mode with zero current drain
• Thermal shutdown protection
• Parallel operation option for 1.8 A, single DC motor
• Overcurrent protection:
▫ Output to supply short
▫ Output to GND short
▫ Output load short
The A3909 is a dual full bridge motor driver, designed for
12 V medium power applications. The outputs are rated for
operation through a power supply range of 4 to 18 V, and
capable of up to 1 A per phase.
Paralleling the outputs is possible for higher amperage single
DC motor applications.
The four inputs (IN1 to IN4) can control DC motors in forward,
reverse, brake, and coast modes, or a bipolar stepper motor in
full- and half-step modes.
The A3909 is supplied in a 10-pin MSOP package with exposed
thermal pad (suffix LY) and a 10-pin SSOP (suffix LN) for
wave solder applications. Both packages are lead (Pb) free
with 100% matte-tin leadframe plating.
Packages:
10-pin MSOP
with exposed thermal pad
(LY package)
10-pin SSOP
(LN package)
Not to scale
Functional Block Diagram
VBB
IN1
Control
Logic
Load Supply
VBB
OUT1
Disable
OUT1
OUT2
OUT2
GND
TSD
UVLO
OCP
Load Supply
GND
VBB
IN2
VBB
IN3
Control
Logic
OUT3
TSD
UVLO
OCP
Disable
OUT3
OUT4
OUT4
VBB
IN4
GND
PAD
LY package
A3909-DS
Configuration
for driving
2 DC motors
Configuration
for parallel operation
at 1.8 A
