You would require a P channel MOSFET of some kind.

A ' HEXFET' switch specially designed for this purpose is preferable such
as the IRF7205PBF, which features an Rds ON of only 70 milliohms with a
drain of up to 4.5A in a nice small package (SO8) and a low price, +/-
R3.50 ea.

http://za.rs-online.com/web/p/mosfet-transistors/5429327/

On Fri, Oct 26, 2012 at 9:33 PM, <tim@nevyn.co.za> wrote:

> Hi,
>
> I have a small project that requires that I switch current on an off via =
a
>  PIC. What I need advice on is which transistor I should use to switch
> power on and off to a device which is powered by a 3.7V 1200mAh battery.
> To add context the PIC will need to remove and apply power to a cell phon=
e
> and hence the transistor needs to sit between the phone and battery.
>
> Any advice / experience would be much appreciated.
>
> Regards
>
> Tim
>
>
> --
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--=20
Perry Curling-Hope

Research and Development
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