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LM7805, Switching regulator?

Discussion in 'Datasheets, Manuals and Component Identification' started by pyrohaz, Jan 30, 2013.

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  1. pyrohaz


    Oct 28, 2012
    I was recently reading the LM7805 regulator datasheet (yes, I know its a linear regulator), but the datasheet at the bottom showed a figure of using it as a switching regulator with a pass transistor?

    Where could I possibly find more information on using the LM7805 as a switching regulator and can the LM317 do this?

  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    Do you refer to this datasheet, figure 19?
    This may work, but I would not recommmend the circuit. Neither would I recommend abusing an LM317.
    Today there are dedicated switch mode ICs that I recommend using.
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