Graham Sutherland / Polynomial@m @simonlbn @delroth running the numbers, it's ~1Wpk of additional dissipation on a decent buck reg tuned for peak efficiency at peak load, so an additional 6.5% over the existing thermal output at peak load. by the time you subtract the losses of the existing VBUS 5V -> regulated 3.3V conversion, which would be replaced, it'll be even less.
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