Data Sheet

DMOS Microstepping Driver with Translator
and Overcurrent Protection
A4988
3
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Functional Block Diagram
SENSE1
SENSE2
VREG
VCP
CP2
Control
Logic
DAC
VDD
PWM Latch
Blanking
Mixed Decay
DAC
STEP
DIR
RESET
MS1
PWM Latch
Blanking
Mixed Decay
Current
Regulator
CP1
Charge
Pump
R
S2
R
S1
VBB1
OUT1A
OUT1B
VBB2
OUT2A
OUT2B
0.1 MF
V
REF
Translator
Gate
Drive
DMOS Full Bridge
DMOS Full Bridge
0.1 MF
0.22 MF
OSC
ROSC
MS2
REF
ENABLE
SLEEP
MS3
OCP
OCP