DMOS Stepper Motor Driver with Translator
A3982
2
Allegro MicroSystems, LLC
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 V
BB
35 V
Logic Input Voltage V
IN
–0.3 to 7 V
Sense Voltage V
SENSE
0.5 V
Reference Voltage V
REF
4V
Output Current I
OUT
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 T
A
Range S –20 to 85 ºC
Maximum Junction Temperature T
J
(max) 150 ºC
Storage Temperature T
stg
–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
