This is a charger for lithium ion batteries which takes its power from the USB port of a computer. It uses the MCP73861 or MCP73863 Li-ion battery charger chip manufactured by Microchip. The circuit board is a piece of single sided copper clad board. A hole is cut inside it so that it will accommodate the integrated circuit.
The MCP73861 or MCP73863 (they are similiar, with only slight differences which do not affect the circuit connections) is available in a small leadless package.
The difficulty? There are no leads to solder to. The advantage? There are no leads to break!
Source:http://www.instructables.com/id/USB-Li-ion-battery-charger/
Related Links
More Circuit about Li-Ion Battery Charger
More Circuit about USB Battery Charger
More Circuit about lithium battery
More about USB port
USB-Powered Lithium-Ion Battery Charger by LM3622
USB Powered AA NiMH – NiCd Battery Charger by LM393
iPOD – MP3 Player Charger by MC34063
USB Battery Replacement by LM317
Power Supply for USB Devices
Portable USB Charger (Version 2.0)
This entry was posted on Friday, November 2nd, 2007 at 8:16 pm and is filed under battery charger.
