Voltage controlled switch for my project

[Guest]

Hi all,

I have a PIC with a GPS powered from same power reg. I want to switch the GPS off using a PIC pin, I was thinking this probably can be done using a transistor but being a newbie not sure which one

So I'm looking a little help finding the right part to do the following.

Voltage (PIC Pin) controlled switch switching 3.3v 80ma Max
AS Low as we can get current consumption when base held low
Small SOT23 pakage

Thx in advance.

Pete T

[kender]

A P-channel MOSFET might solve your problem. Connect the 3.3V through a P-channel MOSFET. Drain to GPS receiver, source to 3.3V supply, gate to the PIC. Drive the gate high to power down the GPS receiver. This MOSFET might work for you Fairchid FDV302P (available at DigiKey, and there are many other suitable P-channel MOSFETS).

If your PIC is using +5V and GPS is using +3.3V, your could use a 3.3V regulator with enable pin hooked up to your PIC.

[sjbaxter]

You would be better using a MOSFET or a smart power switching device.

have a look at :

[url="http://www.analogictech.com/products/advtree_results.aspx?departmentid=97"]This link[/url]

There is a section of 'smart switches', with may give you a few ideas. If these devices aren't what you were thinking of, the schematics may give some guidance.

Edit : Kender .... you beat me to it
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Regards,
Simon.