A4988 Stepper Motor Driver with Heat Sink for 3D Printers

The A4988 is a complete microstepping driver designed for bipolar stepper motors. It supports multiple step resolutions: full, half, 1/4, 1/8, and 1/16 steps, allowing smooth and precise motor movement. The built-in translator simplifies control by enabling one microstep per pulse input, eliminating complex programming steps.

This driver features a fixed off-time current regulator with automatic decay mode selection between slow and mixed decay. The mixed decay mode reduces audible motor noise and power consumption while enhancing step accuracy. Internal circuits provide thermal shutdown, undervoltage lockout, crossover-current, ground fault, and load short-circuit protections, ensuring reliable operation.

The A4988 comes in a compact 5 mm x 5 mm surface mount QFN package, including an exposed pad for enhanced heat dissipation. This packaging along with synchronous rectification control helps minimize power loss and maintain stable temperature during operation.

Designed to be easily integrated into 3D printer controllers and CNC boards, it is compatible with 3.3 V and 5 V logic supplies. Its straightforward step input interface reduces microprocessor workload, making it suitable in applications with limited processing capability.

• Microstepping modes: Full, 1/2, 1/4, 1/8, 1/16
• Voltage Output: Up to 35 V
• Current Output: ± 2 A
• Logic Voltage: 3.3 V / 5 V compatible
• Protection Features: Thermal shutdown, UVLO, crossover-current, ground fault, short-circuit
• Package: 5 mm × 5 mm QFN with exposed pad
• Current decay modes: Slow and mixed automatic selection
• Power Dissipation: Synchronous rectification to reduce losses

• A4988 stepper motor driver module with integrated heat sink and carrier board