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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@DrAzzy
Yes, that is extremely low current :-P
5LN01SP is rated up to 150mA - though it's N-channel, not P-channel, so you're switching the low side. The creatively named 5LP01SP is the complementary P-channel one if you want to switch high side. (only 70mA and digikey doesn't stock them, though - mouser does, though). Note that you may be better off switching the low side, since the idle state of a UART pin is high.
At that point, you could probably just power it off an Espruino IO pin? You can get 20mA out of them as Gordon noted above.