DMOS Stepper Motor Driver with Translator

A3982

2

Allegro MicroSystems, Inc.

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

fixed off-time, then to a slow decay for the remainder of the

off-time). This current decay control scheme results in reduced

audible motor noise, increased step accuracy, and reduced power

dissipation.

Internal synchronous rectification control circuitry is provided to

improve power dissipation during PWM operation.

Internal circuit protection includes: thermal shutdown with

hysteresis, undervoltage lockout (UVLO), and crossover-current

protection. Special power-on sequencing is not required.

The A3982 is supplied in a 24-pin wide-body SOIC

(package LB) with internally-fused power ground leads for

enhanced thermal dissipation. It is lead (Pb) free, with 100%

matte tin plated leadframe.

Description (continued)

Absolute Maximum Ratings

Characteristic

Symbol

Notes

Rating

Units

Load Supply Voltage

35

V

Logic Input Voltage

–0.3 to 7

V

Sense Voltage

0.5

V

Reference Voltage

4V

Output Current

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.

±2

A

Operating Ambient Temperature

Range S

–20 to 85

ºC

Maximum Junction Temperature

150

ºC

Storage Temperature

–55 to 150

ºC

Selection Guide

Part Number

Packing*

Package

A3982SLB-T

31 pieces per tube

24-pin Wide SOIC with pins 6 and 7, and 18

and 19, fused internally

A3982SLBTR-T

1000 pieces per reel

*Contact Allegro for additional packing options