The DRV8870 device is a brushed-DC motor driver for
printers, appliances, industrial equipment, and other small machines. Two logic inputs control the
H-bridge driver, which consists of four N-channel MOSFETs that can control motors bidirectionally
with up to 3.6-A peak current. The inputs can be pulse-width modulated (PWM) to control motor
speed, using a choice of current-decay modes. Setting both inputs low enters a low-power sleep
The DRV8870 device features integrated current
regulation, based on the analog input VREF and the voltage on the ISEN pin, which is proportional
to motor current through an external sense resistor. The ability to limit current to a known level
can significantly reduce the system power requirements and bulk capacitance needed to maintain
stable voltage, especially for motor startup and stall conditions.
The device is fully protected from faults and short circuits, including undervoltage
(UVLO), overcurrent (OCP), and overtemperature (TSD). When the fault condition is removed, the
device automatically resumes normal operation.
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