Lithium Charging Help!

Thread Starter

Gordon1

Joined Jul 1, 2008
1
Hello.

I am having some problems with a project of mine. I have a space that is 16mm by 50mm by 4mm (LxWxH) that I need to fit a charging circuit in. I am having problems finding a charging circuit for 2 3.7v 400mah li-ion cells in series. they by no means need to be high current, just enough to charge. This Charger has to fit in the above space. My maximum input voltage would be about 5.5v and my maximum current would be about 300ma. But that power is coming from a solar cell 2" by 4" (and I am not expert on solar cells and current ratings of them).
I have been looking at this onehttp://focus.ti.com/lit/ds/symlink/bq24901.pdf but I can't tell if I need any other components for the actual circuit.
Basically I am trying to build one of these http://cgi.ebay.ca/Solar-Power-Charger-for-Cell-Phone-PDA-MP3-MP4-Camera_W0QQitemZ150264817562QQihZ005QQcategoryZ41981QQssPageNameZWDVWQQrdZ1QQcmdZViewItem#ebayphotohosting
but I am struggling with the low current charger.

Oh, and everything is in DC by the way.

Please help me!

 
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