How Much Power Can The Gen3 TPU Supply?

So I’ve upgraded from my autopi Gen3 from the pi3 to the pi-4, and am wondering how much power the pi4 can pull from the regulator on the gen 3 board.

IIRC the pi4 by itself already pulls ~5v @ 3A. What if I wanted to also run a couple of 500ma webcams, a 100ma cooling fan, and a 300ma relay driver off it’s USB?

If the above is beyond the Gen3’s capabilities, I can always power the extra peripherals via an external supply, but I’ve no idea how much power I’ve got to work with from the Gen3 regulator.

Is there a schematic out there I missed?


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