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| A4954 Datasheet, PDF (1/9 Pages) Allegro MicroSystems – Dual Full-Bridge DMOS PWM Motor Driver | |||
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Features and Benefits
⢠Low RDS(on) outputs
⢠Overcurrent protection (OCP)
â« Motor short protection
â« Motor lead short to ground protection
â« Motor lead short to battery protection
⢠Low Power Standby mode
⢠Adjustable PWM current limit
⢠Synchronous rectification
⢠Internal undervoltage lockout (UVLO)
⢠Crossover-current protection
Package: 16-pin TSSOP with exposed
thermal pad (suffix LP)
A4954
Dual Full-Bridge
DMOS PWM Motor Driver
Description
Designed for pulse width modulated (PWM) control of two
DC motors, the A4954 is capable of peak output currents to
±2 A and operating voltages to 40 V.
Input terminals are provided for use in controlling the speed and
direction of a DC motor with externally applied PWM control
signals. Internal synchronous rectification control circuitry is
provided to lower power dissipation during PWM operation.
Internal circuit protection includes overcurrent protection,
motor lead short to ground or supply, thermal shutdown with
hysteresis, undervoltage monitoring of VBB, and crossover-
current protection.
The A4954 is provided in a low-profile 16-pin TSSOP package
with exposed thermal pad (suffix LP) that is lead (Pb) free,
with 100% matte tin leadframe plating.
Not to scale
Functional Block Diagram
IN1
IN2
GND
VREF12
IN3
IN4
GND
VREF 34
OSC
Charge
Pump
Control
Logic
Disable
TSD
UVLO
7V
÷ 10
OSC
Charge
Pump
Control
Logic
Disable
TSD
UVLO
7V
÷ 10
Load Supply
VBB
OUT1
OUT2
LSS12
(Optional)
VBB
OUT3
OUT4
LSS34
(Optional)
A4954-DS, Rev. 4
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