A4988 Datasheet – Microstepping Motor Driver

Part number : A4988, A4988SETTR-T

Functions : Microstepping Motor Driver

Package information : QFN 28 Pin type ( 5mm x 5mm x 0.9 mm )

Manufacturer :  Allegro MicroSystems ( https://www.allegromicro.com/ )

Image :

4988 Motor driver


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 pinout


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

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A4988 Datasheet PDF File