simple question about turning off/on a regulator.

cctech at cctech at
Sat Mar 24 08:56:10 CDT 2007

How much current do you need? The LT3503 buck converter will do 1A and has 
a shutdown pin. There are Maxim parts that use external FETs and also have 
a shutdown pin.

If you have your heart set on a linear regulator, you might be able to use 
an adjustable one and drive the ADJ pin to 5V to shut it off.


On Fri, 23 Mar 2007, jpero at wrote:

> Fixing FE1250 Nec (actually two!), 22" monitor monsters.
> Have the bulletin on fix these problems and problem is that I cannot
> get this part easily here.  Switchable off and on adjustable
> regulator set for 3.3V in 5 pin SMD flat pack with heatsink tab.
> The part number PQ20WZ51, marker: Sharp.
> I can make a 3.3V regulator but best way to switch it off or on (fet
> or transistor with low gate/base current?  Data sheet for this
> regulator is available had to dig inside sharp semiconductor area
> even with google didn't find to find out what I need to rig the power
> control side.
> Cheers, Wizard

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