DETAILED DESCRIPTION
The DRV8870 device is a brushed-DC motor driver
for printers, appliances, industrial equipment, and
other small machines. Two logic inputs control the Hbridge
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 pulsewidth
modulated (PWM) to control motor speed, using
a choice of current-decay modes. Setting both inputs
low enters a low-power sleep mode.
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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