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A4950

Full-Bridge DMOS PWM Motor Driver

Allegro MicroSystems 

A4950

Full-Bridge DMOS PWM Motor Driver

Features and Benefits

• Low RDS(on) outputs

• Overcurrent protection (OCP)

▫ Motor short protection

▫ Motor lead short to ground protection

▫ Motor lead short to battery protection

• Low Power Standby mode

• Adjustable PWM current limit

• Synchronous rectification

• Internal undervoltage lockout (UVLO)

• Crossover-current protection

• Commercial temperature grade (A4950E: –40°C to 85°C )

• Automotive temperature grade (A4950K: –40°C to 125°C)

Package: 8-pin SOICN with exposed

thermal pad (suffix LJ)

Description

Designed for pulse width modulated (PWM) control of DC

motors, the A4950 is capable of peak output currents to ±3.5 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.

For high ambient operating temperature applications, an

automotive grade device is offered (A4950K). The K grade

device is tested across extended temperature and voltage

ranges to ensure compliance in automotive or industrial

applications.

The A4950 is provided in a low-profile 8-pin SOICN package

with exposed thermal pad (suffix LJ) that is lead (Pb) free, with

100% matte tin leadframe plating.

Not to scale

Functional Block Diagram

IN1

IN2

GND

VREF

OSC

Charge

Pump

Control

Logic

Disable

TSD

UVLO

7V

÷ 10

Load Supply

VBB

OUT1

OUT2

LSS

(Optional)

A4950-DS, Rev. 3

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