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LM7805, Switching regulator?

pyrohaz

Oct 28, 2012
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Oct 28, 2012
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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,
 

Harald Kapp

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Nov 17, 2011
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Nov 17, 2011
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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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