A4989SLDTR-T – ALLEGRO

The A4989SLDTR-T, manufactured by Allegro MicroSystems, is a bipolar stepper motor driver IC designed for operating voltages ranging from 3.0V to 5.5V. This device integrates control logic and power output stages to facilitate precise microstepping motor control. The A4989 incorporates fixed off-time current regulators, enabling operation in mixed, fast, and slow decay modes. Internal PWM current control, combined with a DMOS output stage, allows for efficient and quiet motor operation. Protection features include overcurrent protection, thermal shutdown, and undervoltage lockout. The IC is housed in a 38-lead TSSOP (Thin Shrink Small Outline Package) suitable for surface mount assembly, offering a compact footprint for space-constrained applications. The A4989SLDTR-T is typically employed in applications requiring precise positioning and speed control of bipolar stepper motors, such as robotics, industrial automation, and medical equipment.