Data Sheet

DMOS Microstepping Driver with Translator
and Overcurrent Protection
A4988
2
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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 A4988 is supplied in a surface mount QFN package (ES), 5 mm
× 5 mm, with a nominal overall package height of 0.90 mm and an
exposed pad for enhanced thermal dissipation. It is lead (Pb) free
(suffix –T), with 100% matte tin plated leadframes.
Description (continued)
Absolute Maximum Ratings
Characteristic Symbol Notes Rating Units
Load Supply Voltage V
BB
35 V
Output Current I
OUT
±2 A
Logic Input Voltage V
IN
–0.3 to 5.5 V
Logic Supply Voltage V
DD
–0.3 to 5.5 V
VBBx to OUTx 35 V
Sense Voltage V
SENSE
0.5 V
Reference Voltage V
REF
5.5 V
Operating Ambient Temperature T
A
Range S –20 to 85 ºC
Maximum Junction T
J
(max) 150 ºC
Storage Temperature T
stg
–55 to 150 ºC
Selection Guide
Part Number Package Packing
A4988SETTR-T 28-contact QFN with exposed thermal pad 1500 pieces per 7-in. reel