The use case is a L4xx MCU that needs to write to an SD card, most of the time the MCU sleeps and checks sensors. The ST1PS01EJR can be configured to start up at 1.8V and then the MCU could change the output to 3.3V write the data then change back to 1.8V. At 400ma the ST1PS01EJR has plenty of headroom for the MCU but will the ST1PS01EJR change voltage without causing the MCU issues? From what I read in the data sheet it appears it will work.
