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The Pi Pico datasheet recommends a maximum power draw on the 3V3 pin (pin 36) of 300mA. However, the RT6154B datasheet indicates that up to 3A can be drawn when Vin > 3.6V, which is the case when powering the Pico from the USB connector with a 5V/3A power supply. I am considering a design where I would draw around 1A on the 3V3 rail. Should I use yet another power converter or can I safely draw the 1A from pin 36 ?

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  • I've noticed this too. The datasheet also lists some constraints for the board design for high currents. Did you look into this further? How did your design end up?
    – KevinJWalters
    Commented Jul 9 at 20:00
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    @KevinJWalters: I powered it using an external 3.3V power source. For example, the AMS1117-3.3 for less than 1A circuits and the MPM3610A for higher currents.
    – ma3oun
    Commented Jul 12 at 12:52

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You can safely draw the suggested 300 mA.

I don't know what damage you will cause to the traces if you draw more. To find out you will have to ask the board designers.

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