schematic with USB and cart power supplies going into one chip, and then going through a voltage regulator

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1. allison (aparrish@friend.camp)'s status on Tuesday, 30-Apr-2024 08:53:06 JST allison

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   if anyone has ideas about the inconsistent power, i'd love advice! the schematic for the voltage regulator section is attached. the lm66200 is there so i'm never accidentally powering from both gameboy and USB; the regulator is a regular old 3.3v linear regulator. 3.3v goes to the rp2040, which has the normal decoupling cap setup. after power up, voltages on inputs/output are normal, but the rp2040 doesn't initialize. i suspect startup current draw is an issue?