Datasheet

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 4A 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.

(http://adafru.it/dLZ)LEDs

There are two onboard LEDs. The Green 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

Battery and USB connection

You can connect a battery to the breakout strip or to the input end. We do not solder o n

a JST connector because JST 2-PH are rated for 2A and the boost converter can

suck up to 4A thru the contacts! If you're pretty sure that you won't be sourcing more than

2A, say if you're going to have 1A output and 3.7V LiPoly/LiIon input, you can go ahead and

use a JST connector. All of Adafruit batteries come with JST cables that will plug in nicely.

Watch the polarity of the cable! the + and - markings next to the JST will let you know

which way is which.

If you aren't using a LiIon or if you are going to be drawing more than 2A from the input, then

we suggest going with the 3.5mm terminal block, solder that where the JST would go.

On the output side, the USB connector can be soldered on to create a portable 'USB power

pack'. The two data lines on USB have resistor dividers that match Apple charger values so

that you can plug any iOS device in to charge. 99% of other phones, devices and tables are

totally cool with these resistors as well. You can always short the D+ and D- lines if you

happen to have a phone that wants shorted data lines.

If you don't want a USB connector attached, there are two holes that are designed for a

3.5mm spaced terminal block