TSMC 7nm has all the required stuff to build a DC-DC converter from 3V or 1.8V. Nobody would use on-chip inductors for high power DC-DC. As for skillset, there

TSMC 7nm has all the required stuff to build a DC-DC converter from 3V or 1.8V. Nobody would use on-chip inductors for high power DC-DC. As for skillset, there are a bunch of IP companies with silicon proven designs available. I'm sure they didn't design their SERDES or PLL(s) in-house either.