SLVSCC0D November 2013 – October 2019 DRV8850
An LDO regulator is integrated into the DRV8850 device. The LDO regulator is typically used to provide the supply voltage for a low-power microcontroller. For proper operation, bypass the LDOOUT pin to GND using a ceramic capacitor. The recommended value for this component is 2.2 μF.
Two external resistors are used to set the LDO voltage (VLDO) by creating a voltage divider between LDOOUT and LDOFB. The LDO output voltage can be given by:
The output voltage is adjustable from 1.6 V to VCC – VLDO using external resistors. The 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.
When the LDO current load exceeds ICL, the LDO regulator behaves like a constant current source. The LDO output voltage drops significantly with currents greater than ICL.