Lithium Ion Help!


  #1  
Old 07-01-08, 12:32 AM
G
Member
Thread Starter
Join Date: Jul 2008
Posts: 1
Likes: 0
Received 0 Likes on 0 Posts
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!
 
  #2  
Old 07-01-08, 06:24 AM
waterwelldude's Avatar
Member
Join Date: Jun 2008
Location: S.E. Texas
Posts: 1,038
Likes: 0
Received 0 Likes on 0 Posts
These pepole should be able to help you with your project.

http://forum.allaboutcircuits.com/index.php
 
  #3  
Old 07-01-08, 07:42 AM
W
Member
Join Date: Jun 2008
Location: Maryland
Posts: 295
Likes: 0
Received 0 Likes on 0 Posts
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.
 
 

Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: