A3909 Datasheet, PDF (1/10 Pages) Allegro MicroSystems – Dual Full Bridge Motor Driver

A3909
Dual Full Bridge Motor Driver
Features and Benefits
• Low R_DS(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
Packages:
Description
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.
TheA3909 is supplied in a 10-pin MSOPpackage 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.
10-pin MSOP
with exposed thermal pad
(LY package)
Not to scale
10-pin SSOP
(LN package)
IN1
IN2
IN3
IN4
A3909-DS
Functional Block Diagram
VBB
Load Supply
Control
Logic
Disable
TSD
UVLO
OCP
VBB
Control
Logic
Disable
TSD
UVLO
OCP
VBB
OUT1
OUT2
GND
VBB
OUT3
OUT4
PAD
LY package
GND
Configuration
for driving
2 DC motors
VBB
Load Supply
OUT1
OUT2
GND
OUT3
OUT4
Configuration
for parallel operation
at 1.8 A