BUY UCN5812A https://www.utsource.net/itm/p/312763.html
BiMOS II 20-BIT SERIAL-INPUT, LATCHED SOURCE DRIVERS WITH ACTIVE-DMOS PULL-DOWNS
Description: The UCN5812A is a unipolar stepper motor driver IC from Allegro MicroSystems. It is designed to drive a unipolar stepper motor with up to 2A of current. Features: - Low voltage operation (3.3V to 7.5V) - Low power consumption - Built-in thermal shutdown protection - Programmable current control - Programmable microstepping - Open collector outputs Applications: - Robotics - Automation - Industrial control - 3D printing - CNC machines (For reference only)