Lithium Ion Help!

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Old 07-01-08, 12:32 AM
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Lithium Ion Help!

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 woulf be about 5.5v.
I have been looking at this one http://focus.ti.com/lit/ds/symlink/bq24901.pdf but I can't tell if I need any other components for the actual circuit.

Oh, and everything is in DC by the way.

Please help me!
 
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Old 07-01-08, 06:24 AM
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These pepole should be able to help you with your project.

http://forum.allaboutcircuits.com/index.php
 
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Old 07-01-08, 07:42 AM
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Also the online version of "Electronic Design" has a circuit archive.
At charge rates of C/20 or C/100 it shouldn't be difficult, but I only worked with Nicads.
You need to find charging protocols for this type of chemistry.
 
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