USB LiIon/LiPoly charger - v1.2
PRODUCT ID: 259
Description
This is a Lithium Ion and Lithium Polymer battery charger based on the MCP73833. It uses a USB mini-B
for connection to any computer or 'USB wall adapter'. Charging is performed in three stages: first a
preconditioning charge, then a constant-current fast charge and finally a constant-voltage trickle charge to
keep the battery topped-up. The fast-charge current is 500mA by default, but is easily adjustable from
100mA up to 1000mA by soldering a through-hole resistor on-board.
This board is great for DIY projects because it has 3 indicator LEDs - one for power, one for charging
status and a third that indicates when charging is complete. Keep the battery connected to the charger and
pass power through the additional JST connector using the included cable!
For use with Adafruit Lipoly batteries only! Other batteries may have different voltage, chemistry, polarity
or pinout.
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Comes assembled and tested, includes a JST cable!
5V input via mini-B USB connector
For charging single Lithium Ion/Lithium Polymer 3.7/4.2v batteries (not for older 3.6/4.1v cells)
500mA charge current, adjustable from 100mA to 1000mA by soldering in a resistor
Separate JST connectors for battery and load system so batteries don't have to be removed for
charging
Chip supports a 10K NTC thermistor which we have stuffed as a plain 10K. For people who
require temperature monitors (using high charge rates), remove the 10K and solder in the
thermistor in its place
0.1" (2.54mm) breakouts for the battery, DC, and status LEDs
Free 2-pin JST cable included!
Batteries and USB cable not included.
Technical Details
Details:
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Dimensions: 33mm x 35mm x 7mm (1.3in x 1.4in x 0.3in)
Weight: 5.7g ( 0.2oz)
Engineered in NYC Adafruit ®
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