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Component to cut off current to parts of low power circuit

Discussion in 'General Electronics Discussion' started by phoenixyx, Jul 24, 2017.

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  1. phoenixyx


    Feb 8, 2017

    I am working on a low power design, and are looking for a component which may cut off current. I need to control this component from an I/O 3V3. And it should switch on/off parts of the circuit (one input and one output.)

    Is a normal mosfet the best way to do this?(current peaks up to maybe 1 A, normal current consumption around 80mA)

    I have been looking around and but are not sure what to search for.(keywords):

    Any ideas?
  2. Alec_t


    Jul 7, 2015
    Welcome to EP!
    A MOSFET will do nicely. Look for a 'logic level' type with a Vgs(th) as low as possible (say ~1V).
  3. phoenixyx


    Feb 8, 2017

    Great, thank you, I will go looking for that.
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    Another option, if you are using voltage regulator to generate the 3v3 rail, is to find regulators with an enable pin and have a separate regulator for each section of circuitry you want to power up and down.

    Be aware that even without power the devices may continue to draw power and operate! Many devices will have input protection that will route power from the inputs to the power rail if unpowered. You may need to also ensure that signals to the circuit that is peered down are disabled to prevent this.
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