Description

Designed for pulse-width modulated (PWM) current control of bipolar microstepping stepper motors, the A3973 is capable of continuous output currents to ±1 A and operating voltages to 35 V. Internal fixed off-time PWM current-control timing circuitry can be programmed via a serial interface to operate in slow, fast, and mixed current-decay modes.

Features and Benefits

▪ ±1 A, 35 V Continuous Output Rating

▪ Low RDS(on) DMOS Output Drivers

▪ Optimized Microstepping via 6-Bit Linear DACs

▪ Programmable Mixed, Fast, and Slow Current Decay Modes

▪ 4 MHz Internal Oscillator for Digital Timing

▪ Serial-Interface Controls Chip Functions

▪ Synchronous Rectification for Low Power Dissipation

▪ Internal UVLO and Thermal Shutdown Circuitry

▪ Crossover-Current Protection

▪ Precision 2 V Reference

▪ Inputs Compatible with 3.3 or 5 V Control Signals

▪ Sleep and Idle Modes