Datasheet

battery, NOT the output power! You can use this if you want to grab power from the

microUSB port when it is plugged in

BAT - this is the battery input, connected directly to the JST connector. For most

Lithium batteries, this will range from 3.0V when near-dead to 4.2V when fully-

charged. Higher voltages will let you draw more current and in general, are more

efficient. Try to keep the wires going to this pin nice and short - 3" or less is best!

VS - this is the load shared output from the battery charger. When there is 5V coming

in from the micro-B USB power plug, this pin will have approx 5V on it (less a little due

to the internal resistance of the charger chip's MOSFET). When there's no USB

charging, the Vs pin will be the same voltage as the Bat pin.

GND - this is the power ground. This boost converter is not 'isolated' - the ground

input is the same as the ground output

5V - this is the boosted output. When the board is running, the voltage will be 5.2V

approximately. It may dip down to 5V as the current draw starts to go up (over

500mA). When the board is disabled, this output is 'floating' but you should still try not

to apply a voltage to it while the board is disabled. There's a blue LED connected to

this pin which will let you know when there's power output

Control Pins

There's two 'control' pins.

EN - this is the 'enable' pin. By default it is pulled 'high' to VS. To turn off the booster,

connect this pin to ground. The switch can be as small as you like, it is just a signal.

Contrast this to an inline power switch which would have to be able to handle up to 2A

of current! When the chip is disabled the output is completely disconnected from the

input.

LBO - not a leveraged buy out! this is the Low Battery Output. By default it is pulled

high to BAT but when the charger detects a low voltage (under 3.2V) the pin will drop

down to 0V. You can use this to signal when its time to shut down or alert the user

that the battery is low. There is also a red LED connected to this pin.

LEDs

There are four onboard LEDs.

The Blue LED sits next to the USB connector socket, and indicates the 5V output

power state.

The Red LED is next to the battery JST port and indicates when the battery voltage is

below 3.2VDC (Low Battery Output)

https://learn.adafruit.com/adafruit-powerboost-1000c-load-share-usb-

charge-boost

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