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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

    pyrohaz

    33
    0
    Oct 28, 2012
    Hey,
    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?

    Thanks,
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    11,517
    2,652
    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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