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Return to BlogLi-On Battery Charger via USB
Posted Jan 12, 2012 at 10:10 am
Figure 1
A USB port is a great power source for charging a single cell li-on battery. It is capable of supplying maximum 5.25V and 500 mA. The circuit above is a USB powered single cell li-on 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.
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2 years ago: I want to try this circuit coz it is in demand nowadays especially in mobile phones. Does any one has a rough idea how much does the main IC cost?
2 years ago: I am using this on my batteries since I am always in front of my computer. It is more convenient than looking for an electric socket to plug in to...
2 years ago: I want to build this circuit! This is now very popular because of the booming use of laptops and as long as I have my USB cable, I can charge my blackberry!!!