Adafruit Liion/Lipoly Backpack Add-On For Pro Trinket/Itsybitsy; 5V Power Pins - adafruit learning system ItsyBitsy 32u4 Manual

On the 3V Itsy, we have a different regulator, so the voltage can only be from 3.5V to 6VDC
GND - Power/data ground
USB - This is the same pin as the MicroUSB connector's 5V USB power pin. This should be used as an output to
get 5V power from the USB port. Say if you need to power a bunch of NeoPixels or servos.
You can always put any voltage you like into BAT and the circuitry will switch between BAT and USB dynamically for
you. That means you can have a Batter backup that only gets enabled when USB is disconnected.
If you want to add rechargeable power, a LiPoly backpack can be soldered into these three pins that will let you have a
battery that is automatically recharged whenever USB is plugged in, then switches to LiPoly when on the go:

5V Power Pins

In addition to the three standard power pins, the 5V ItsyBitsy has a few more pins available for power sourcing:
5V - this is the regulated output from the onboard regulator or the USB connection (if its powered!) You can draw
500mA when USB is connected, or up to 150mA when on battery.
3V - this power pin is in the bottom right corner. It is a small 3V output from the on-chip regulator. It's very low
current, we don't recommend drawing more than maybe 10 mA from this, but it can run small sensors!
EN - connected to the regulator enable, it will let you shut off power - when running on battery only . But at least
you don't have to cut a trace or wire to your battery. This pin does not affect power when using USB
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