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Voltage source with Low Quiescent and No Minimum Load

Discussion in 'Electronic Design' started by rich, Sep 10, 2012.

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  1. rich

    rich Guest

    I need to provide a backup voltage to a device, the current requirement is 20uA. The device is battery powered. It is my understanding that zener regulator requires enough current to put the zener into regulation which would be too much for our battery life.

    I know there are voltage references out there for this but they all seem tobe in the $2 range, a bit pricey.

    Any elegant solutions?

    Thanks

    Rich
     
  2. mike

    mike Guest

    Since you have no requirements for nominal voltage,
    accuracy, stability, size, weight...and no notion
    of where the power comes from,
    I'd just use an old car battery. Even a dead one
    should do 20uA for a long time.

    The hardest part of a solution is defining the problem.
     
  3. TTman

    TTman Guest

    I need to provide a backup voltage to a device, the current requirement is
    20uA. The device is battery powered. It is my understanding that zener
    regulator requires enough current to put the zener into regulation which
    would be too much for our battery life.

    I know there are voltage references out there for this but they all seem to
    be in the $2 range, a bit pricey.

    Any elegant solutions?

    Thanks

    Rich

    CR2032 coin cell ?

    MCP1700 regulator ? has 1ua quiescent current...
     
  4. Guest

    Depends on voltage needed.
    Use a diode OR gate, where master supply voltage being slightly
    higher than the backup battery which is lithium.
     
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