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Thread: Teensy 4.1 External 3.3V Power

  1. #1
    Junior Member
    Join Date
    Sep 2020
    Posts
    5

    Teensy 4.1 External 3.3V Power

    Hi,

    Can I power the Teensy 4.1 through the 3.3 pin from an external VREG?
    I would like to bypass (remove) the onboard 3.3V regulator and directly apply 3.3V to the 3.3V pins and also 5V to the 5V pin to power the USB part of the circuit and Chip.
    This would work in theory, but there is an EN pin on the onboard regulator connected through a resistor to the OUTPUT of the regulator and also connected to a PIN (PMIC_ON_REQ) from the IMXRT Chip and I do not know what that pin does.

    Thank you.

  2. #2
    Junior Member
    Join Date
    Nov 2019
    Posts
    8
    See if this answers your question

    https://forum.pjrc.com/threads/60373...-external-3-3v

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