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'On/off control for LM7805 regulator'
2003\03\05@074733 by Olin Lathrop

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> I am powering a device using the LM7805 (5V regulator).  I want to be
> able to turn the LM7805 on and off.  The LM7805, as you know, doesn't
> have the on/off pin.  Is there a way to do this?

You could put a switching element in series with its input.  A PNP
transistor or P channel FET would work well.


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2003\03\05@092153 by Micro Eng

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There are alot of LDO's that have a remote on/off capacity. Linear Tech,
Micrel, National Semi, Vishay, ADI among others.  Just check the websites
for them.  If this is a one time deal, National has a pretty good sample
program.






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2003\03\05@105114 by Banjo Spam

picon face
Wouldn't you also need an NPN or N channel FET with
pull up resistor tied to N drain/emitter with same
tied to P gate/base with PIC output to N gate/base to
fully turn off the PNP/P Fet?

--- Olin Lathrop <.....olin_piclistKILLspamspam.....EMBEDINC.COM> wrote:
{Quote hidden}

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> (978) 742-9014, http://www.embedinc.com
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2003\03\05@120434 by Andrew Kieran

picon face
About a year ago, I also needed to be able to use a PIC to turn off it's own power.  I received an
outstanding response to my question from Roman Black.  (Thank you, Roman). Check out his
page at:

http://centauri.ezy.net.au/~fastvid/self_swi.htm

Andrew

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