> Very few SoCs have internal switch mode controllers. That's why PMUs are used. Just look at bottom side of the PCB - there are three coils, two of them very

> Very few SoCs have internal switch mode controllers. That's why PMUs are used. Just look at bottom side of the PCB - there are three coils, two of them very close to the chip looking pretty much like PMU. > It is going to either be an LDO, or take a fixed operating voltage. No, read specification: 3.6 - 6V.