The A3966SA and A3966SLB are designed to drive both windings of a two-phase bipolar stepper motor. Each device includes two H-bridges capable of continuous output currents of ±650 mA and operating voltages to 30 V. Motor winding current can be controlled by the internal fixed-frequency, pulse-width modulated (PWM), current-control circuitry. The peak load current limit is set by the user’s selection of a reference voltage and current-sensing resistors. Except for package style and pinout, the two devices are identical.

FEATURES
■ ±650 mA Continuous Output Current
■ 30 V Output Voltage Rating
■ Internal Fixed-Frequency PWM Current Control
■ Satlington™ Sink Drivers
■ User-Selectable Blanking Window
■ Internal Ground-Clamp & Flyback Diodes
■ Internal Thermal-Shutdown Circuitry
■ Crossover-Current Protection and UVLO Protection