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Thread: Teensy 4.0 3.3v maximum current?

  1. #1
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    Teensy 4.0 3.3v maximum current?

    I can't seem to find a reference to the maximum capacity of the 3.3v regulator in Teensy 4.0.

    What's the maximum current that should be drawn by external circuitry on the 3.3v pins on Teensy 4.0?

    I see that the TLV75733P is rated up to 1 amp, but there may be thermal limitations with the Teensy board, not to mention its own current draw.

    Thanks in advance.

  2. #2
    Senior Member+ defragster's Avatar
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    The T4 card shows a 250 mA max indication on 3.3V pin : https://www.pjrc.com/teensy/pinout.html

    Paul noted somewhere that more only works up to the point the heat can be dissipated - and when the fuse triggers. Can you see parts specs on the fuse is this showing 500 mA: https://www.pjrc.com/teensy/schematic.html

  3. #3
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    Awesome, thanks!

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