Use a P-channel MOSFET (like *IRLML6401* 
<http://www.irf.com/product-info/datasheets/data/irlml6401.pdf>)

On Wednesday, December 31, 2014 8:36:19 PM UTC+11, Kevin D'Souza wrote:
>
> I have an application that needs a XBee and another module to be turned on 
> and off digitally via a BealgeboneBlack.
>
> The Setup is 2 XBee's and an application board is connected to the 
> BealgeboneBlack's 
> UART and a GPIO for the power state . When the System is Powered ON I 
> need 1 Xbee and the BealgeboneBlack to come on and do its routines. After 
> the system gets a specific signal from the Xbee (wirelessly from a 
> baseStation) the board has to turn on the other XBee and application board. 
> And when the operation is over, the XBee and Board is to be powered back 
> down. 
>
> I dont want to put them in sleep or low power state, just power both those 
> devices off.
>
> Was thinking of using a relay. But i cannot find a 3.3v 1A SMD Equivalent 
> system. I am looking for a SMD type of footprint to go on a very compact 
> board.
>
> What options do i have?
>
> The XBee needs around 1A Power and the Application board 500mA.
>

-- 
For more options, visit http://beagleboard.org/discuss
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