SW4 of MC33PF8100EAES seems to be programmed to 0.4V, is it possible to change the output voltage of SW4? Looking at the datasheet, I think ....changing the output voltage, but I'm not sure.
Yes, SW4 is programmed to 0.4V as shown in the PF8100EA OTP config report. This voltage can be changed later by writing the VSW4_RUN[7:0] bits in the SW4 RUN VOLT register through I2C.
