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DMOS Dual Full-Bridge PWM Motor Driver

Designed for Pulse Width Modulated (PWM) current control of low voltage stepper motors, the A3965S is capable of output currents to ± 500 mA and operating voltages to 20 V.

The A3965 is particularly attractive for low power or battery operated motors where minimal power consumption is desired. A SLEEP mode disables all circuitry and typically draws less than 1µA supply current from motor and logic supply. During operation the fixed frequency ON pulses of each H-bridge are 180 degrees out of phase to minimize the peak demand required of the motor supply allowing savings in size and cost of external power supply components.

FEATURES

■ ±500 mA, 20 V Output Rating

■ 2.85 to 5.5V Logic Supply Operation

■ Sleep Mode for Minimum Power Consumption

■ Fixed Frequency PWM

■ Offset On Pulses to Minimize Peak Supply Transient Currents

■ Internal UVLO and Thermal Shutdown Circuitry

■ Crossover-Current Protection