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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

    jeff77789

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    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?"


    thanks!
     
  2. davenn

    davenn Moderator

    13,836
    1,950
    Sep 5, 2009
    most of them are lower dropout voltage

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

    Dave
     
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,496
    2,837
    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

    jeff77789

    17
    0
    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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