A4950_16 Datasheet, PDF (1/9 Pages) Allegro MicroSystems – Full-Bridge DMOS PWM Motor Driver

A4950
Full-Bridge DMOS PWM Motor Driver
Features and Benefits
• Low R_DS(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
• A4950K is AEC-Q100 Grade 1 qualified
• 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 V_BB, 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. 4