ALLEGRO MICROSYSTEMS A4988 Microstepping Motor Driver IC, QFN-28 Package

The ALLEGRO MICROSYSTEMS A4988 Microstepping Driver is a complete, integrated solution for controlling bipolar stepper motors with precision and ease. It features a built-in translator that simplifies operation by eliminating the need for complex control sequencing, making it ideal for both prototyping and production applications.

This versatile driver is designed to operate stepper motors in full-, half-, quarter-, eighth-, and sixteenth-step modes, providing smooth and quiet motion control. With an output drive capacity of up to 35 V and ±2 A, it can handle a wide range of motor types and sizes, ensuring reliable performance in demanding environments.

A key feature is its fixed off-time current regulator, which supports operation in either Slow or Mixed decay modes. The driver includes automatic current decay mode detection and selection, optimising performance and efficiency for your specific motor and application. Synchronous rectification is incorporated to minimise power dissipation and improve thermal management.

Robust Protection Features

For enhanced system reliability, the A4988 integrates comprehensive protection circuitry. This includes internal under-voltage lockout (UVLO), crossover-current protection, and thermal shutdown to prevent damage from overheating. It also features short-to-ground and shorted load protection, safeguarding both the driver and the connected motor.

The logic supply is compatible with both 3.3 V and 5 V systems, offering flexibility for integration with various microcontrollers and digital logic families. Housed in a compact QFN-28 package, it is suitable for space-constrained designs.

Specifications at a Glance

• IC Type: Microstepping Motor Driver with Translator
• Motor Type: Bipolar Stepper
• Step Modes: Full, Half, Quarter, Eighth, Sixteenth
• Output Current: 2 A
• Output Voltage: 35 V<br