DRV8850_16 Datasheet, PDF (11/30 Pages) Texas Instruments – Low-Voltage H-Bridge IC with LDO Voltage Regulator

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7 Detailed Description
DRV8850
SLVSCC0B – NOVEMBER 2013 – REVISED DECEMBER 2015
7.1 Overview
The DRV8850 is an integrated motor driver solution for one DC motor. The device integrates one NMOS H-
bridge, current regulation circuitry, and various protection circuitry. The DR8850 can be powered with a supply
voltage range from 2 V to 5.5 V, and is capable of providing an output current up to 5-A peak current. Actual
operable peak current will depend on the temperature, supply voltage, and PCB ground plane size. Between
VM = 1.95 V and VM = 2 V the H-bridge outputs are shut down.
A simple 4 pin interface allows for individual control of each internal H-bridge FET. The condition where both HS
and LS FETs are turned on at the same time is not allowed. During this input condition both the HS and LS FETs
turn off.
The current monitoring is configurable from a range of 500 mA to 5 A. The VPROPI pin outputs an analog
current that is proportional to the current flowing through the H-bridge. VPROPI is derived from the current
through either of the high side FETs. Because of this, VPROPI does not represent H-bridge current when
operating in a fast-decay mode or low-side slow-decay mode.
The LDO regulator integrated in the DRV8850 is typically used to provide the supply voltage for a low-power
microcontroller. The output voltage is adjustable from 1.6 V to VCC – VLDO using external resistors. LDOEN pin
is used to enable or disable the LDO regulator; when disabled the output is turned off and the LDO regulator
enters a very-low-power state.
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