A4988 Datasheet – Microstepping Motor driver – Allegro

Part Number: A4988, Marking : 4988ET

Function: DMOS Microstepping Driver with Translator and Overcurrent Protection

Package: 28-contact QFN ( 5 mm × 5 mm × 0.90 mm )

Manufacturer: Allegro MicroSystems




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.



A4988 datasheet

Features and Benefits

1. Low Rds(on) outputs
2. Automatic current decay mode detection/selection
3. Mixed and slow current decay modes
4. Synchronous rectification for low power dissipation
5. Internal UVLO
6. Crossover-current protection
7. 3.3 and 5 V compatible logic supply
8. Thermal shutdown circuitry
9. Short-to-ground protection
10. Shorted load protection




Official Homepage: http://www.allegromicro.com/en/Products/Bipolar-Stepper-Motor-Drivers/A4988.aspx

Reference Site



A4988 Datasheet

A4988 pdf


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