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9 Sep 2014

 

USB_charger_LiIon

A USB port is a great power source for charging a single cell Lithium-Ion battery. It is capable of supplying a maximum of 5.25V and 500 mA. The circuit above is a USB powered single cell Li-Ion battery charger. LM3622 is used as the controller. This special purpose IC has a precise end-of-charge control and low battery leakage current about 200nA.  S1 and S2 select the low voltage detect enable/disable.  The low voltage detection is handy for conditioning a deeply discharged battery with a low current stage, to prepare it for the full charge cycle.

LM3622 Li-Ion USB Battery Charger – [Link]

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