DRV8871_16 Datasheet, PDF (7/25 Pages) Texas Instruments – Brushed DC Motor Driver With Internal Current Sense (PWM Control)

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7 Detailed Description
DRV8871
SLVSCY9A – AUGUST 2015 – REVISED JANUARY 2016
7.1 Overview
The DRV8871 is an optimized 8-pin device for driving brushed DC motors with 6.5 to 45 V and up to 3.6-A peak
current. The integrated current regulation restricts motor current to a predefined maximum. Two logic inputs
control the H-bridge driver, which consists of four N-channel MOSFETs that have a typical R_ds(on) of 565 mΩ
(including one high-side and one low-side FET). A single power input, VM, serves as both device power and the
motor winding bias voltage. The integrated charge pump of the device boosts VM internally and fully enhances
the high-side FETs. Motor speed can be controlled with pulse-width modulation, at frequencies between 0 to 100
kHz. The device has an integrated sleep mode that is entered by bringing both inputs low. An assortment of
protection features prevent the device from being damaged if a system fault occurs.
7.2 Functional Block Diagram
bulk
VM
0.1 µF
GND
PPAD
IN1
IN2
Power
VM
VCP
Charge
Pump
VCP
VM
Gate
Driver
OUT1
OCP
VCP
VM
BDC
Core
Logic
Gate
Driver
Internal
Current Sense
Protection Features
Overcurrent Temperature
Monitoring
Sensor
Voltage
Monitoring
OUT2
OCP
PGND
ILIM
R_ILIM
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