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5V to 5V precision voltage reference

Discussion in 'General Electronics Discussion' started by prescott2006, Nov 24, 2010.

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  1. prescott2006

    prescott2006

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    Oct 9, 2010
    Is there any IC that can output a precision 5V from a 5V supply?
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,490
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    Jan 21, 2010
    Doubtful.

    The non-precision 5V source could fall to (say) 4.9V -- how do you get 5V from that?

    OK, you could have (say) a switched capacitor voltage doubler followed by a precision regulator, but I don't know of any package that includes both of these.
     
  3. barathbushan

    barathbushan

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    Sep 26, 2009
    what do you mean by 'precision' ???
    if you use standard regulators like 78xx , you probably need 2 volts to drop at the IC
    so you have to supply 7v i/p .

    But there is a another regulator that works with around 0.5 v drop out voltage , and if you draw less current the drop voltage may be even lesser [minimum 100mv]
    just google out "LM2940" and check out its datasheet .
     
  4. prescott2006

    prescott2006

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    Oct 9, 2010
    In my project, I wish to get a precision 5V from a USB supply. Any way to achieve it?
     
  5. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,490
    2,832
    Jan 21, 2010
    Define "precision".

    Then tell us how the 5V over USB is imprecise.

    The easiest option is to get a switched capacitor voltage doubler and then follow that with a precision voltage reference (which is essentially a fancy regulator).

    It might help if you tell us what you need the 5V reference for, and what current you'll require from it.
     
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