Dual DMOS Full-Bridge

Microstepping PWM Motor Driver

A3973

2

Allegro MicroSystems, Inc.

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

Selection Guide

Part Number

Package

Packing

A3973SB-T

24 pin DIP with two power tabs

15 pieces per tube

A3973SLB-T

24 pin SOICW with four internally fused pins

31 pieces per tube

A3973SLBTR-T

24 pin SOICW with four internally fused pins

1000 pieces per reel

Absolute Maximum Ratings

Characteristic

Symbol

Notes

Rating

Units

Load Supply Voltage

35

V

Output Current*

±1.0

A

Logic Supply Voltage

7.0

V

Logic Input Voltage Range

V

Reference Voltage

3V

Sense Voltage (DC)

500

mV

Package Power Dissipation

Package B

3.1

W

Package LB

2.2

W

Operating Ambient Temperature

Range S

–20 to 85

ºC

Junction Temperature

150

ºC

Storage Temperature

–55 to 150

ºC

*Output current rating may be limited by duty cycle, ambient temperature, and heat sinking. Under any set of conditions, do not exceed

the specified current rating or a junction temperature of 150°C.