Datasheet Allegro A4988 — Datenblatt

A4988
DMOS Microstepping Driver
with Translator and Overcurrent Protection
FEATURES AND BENEFITS ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ Low Rds(on) outputs
Automatic current decay mode detection/selection
Mixed and slow current decay modes
Synchronous rectification for low power dissipation
Internal UVLO
Crossover-current protection
3.3 and 5 V compatible logic supply
Thermal shutdown circuitry
Short-to-ground protection
Shorted load protection
Five selectable step modes: full, 1/2, 1/4, 1/8, and 1/16 PACKAGE:
28-contact QFN DESCRIPTION
The A4988 is a complete microstepping motor driver with
built-in translator for easy operation. It is designed to operate
bipolar stepper motors in full-, half-, quarter-, eighth-, and
sixteenth-step modes, with an output drive capacity of up to 35 V and ±2 A. The A4988 includes a fixed off-time current
regulator which has the ability to operate in slow or mixed
decay modes.
The translator is the key to the easy implementation of the
A4988. Simply inputting one pulse on the STEP input drives …