SLVA888C April 2017 – January 2021 TPS65987D , TPS65988
LDO_3V3 is the supply for the core chip. It can be powered from VIN_3V3 output of LDO driven from VBUS. LDO_3V3 is available whenever the chip is powered. Therefore, this rail can be used to power up the external SPI flash and I2C (or other) pull-ups in the system. This line can supply only 25 mA of current to external devices. Do not overload it by connecting un-necessary devices on this rail.