A3973KB Datasheet PDF - Allegro MicroSystems

The A3976 is designed to drive both windings of a bipolar stepper motor or bidirectionally control two DC Motors. Both H-Bridges are capable of continuous output currents of up to +/- 500 mA and operating voltages to 30V. Free wheeling, substrate isolated diodes are included for output transient suppression when switching motors or other inductive loads. For each bridge the PHASE input controls load current polarity by selecting the appropriate source and sink driver pair. The ENABLE input, when held high, enables the respective output H-bridge. When both ENABLE pins are held low the device will enter SLEEP mode and consume less than 100mA.

FEATURES
■ 30 V , ±500 mA Continuous Output Rating
■ 35V Load Dump Survival
■ Output Short Circuit Protection
■ Coded Fault Diagnostic Outputs
■ Low Current Standby Mode
■ Open Load Monitor
■ Low Current Standby Mode
■ VBB Over Voltage Shutdown
■ Internal Thermal Shutdown Circuitry
■ Internal Low Parasitic Free Wheeling Diodes
■ Crossover Current Protection