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