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Simple Buck Converter Question

Discussion in 'General Electronics Discussion' started by jeff77789, Apr 2, 2013.

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  1. jeff77789


    Feb 23, 2013
    What is the dropout voltage for a LM2596 DC to DC buck converter?

    for 5v 7805 voltage regulators i know that the output voltage drops around 6-7v depending on the regulator

    but what about buck converters? does it work in the same way? does it even have a "dropout voltage?"

  2. davenn

    davenn Moderator

    Sep 5, 2009
    most of them are lower dropout voltage

    google LM2596 and get the datasheet, it will telly you everything :)

  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    If one looked at the datasheet, one might notice a graph showing the dropout voltage (page six, bottom right corner from memory).

    Note that dropout voltage is input - output, so in the case of the 7805, you are quoting 1 to 2V (I have no idea if that's correct, but I'd be dubious about the lower limit without checking the datasheet)
  4. jeff77789


    Feb 23, 2013
    thanks guys, wasnt quite sure how to read the graph at first lol but for me i think my voltage dropout would be around 1v if not 0.5v-0.8v
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