Not exactly sure what you want but I think this part will work for you.
http://www.chipdocs.com/pndecoder/datasheets/SMNS/BTS409L1.html?ReR=GG
btw, this site, chipsdoc.com is the best site for locating any hard to find
docs on devices.
Rick




Graham North wrote:

> Hi all,
>
> Would just like a quick bit of advise.
>
> I am working on a fairly complicated instrument which includes SBC, DSP,
> PLD, various digital circuits, 24 bit ADC, various analogue circuits. My
> problem is that I would like to be able to turn "off" all the circuitry
> but the SBC, using a 3.3V GPIO on the device.
>
> My first thought was this is simple, logic lever N type FETS used as low
> side switches to completely cut the power to the various circuits. Then
> I thought that this could be a problem with the analogue circuitry and
> ADC as these need a good connection to the analogue ground plane.
>
> Would it be better to use a high side switch? If so how? I know that you
> use P type FETS, but have never done it.
>
> My other problems/thoughts were that P types are generally more
> expensive, and this thing costs enough already! And that I can only
> afford to use a single GPIO (not many left).
>
> Hope someone can comment/help,
>
> Kind regards
>
> Graham North
>
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