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Atilla 31st August 2009 08:42 PM

LiPO battery charging
 
I've seen different articles about using and charging LiPO batteries. I know exactly how to handle them in a normal design, but what I want to do this time is a little more demanding. In terms of space.

I want to simultaneously charge two iPod shuffle LiPO batteries from a 5V USB source, taking as little component space as possible. That means using as little parts as possible, going SMD and spending ages with a magnifying glass to do a p2p design, if needed.

I'm just not sure what thebest approach is, I've seen different discrete designs and various ICs that should take care of the whole process, but I don't really have any experience with Lithium batteries. Since the bloody things can catch fire, I'd rather get an opinion from someone that has played with those.

Any sources, ideas, anyone ?

By the way, I'm currently thinking that the MAX1555 is probably the best device for single-cell charging, but I've no experience with it yet, nor any ideas how to charge two cells at the same time over USB.

Atilla 2nd September 2009 12:38 PM

Actually, the MAX1555 is great for exactly what I want to do. I'll source a few of those, but I've got another dilemma on hand.

I want to use two cells in series, to get a higher voltage for an opamp. That shouldn't be a problem, but I need to charge the cells individually with 2 seperate ICs. I wonder how to wire that whole setup so I can accomplish that.

heinrichs 4th September 2009 06:37 AM

i would use some fets as switches so when i have to charge, they disconnect the load, and switch's the each cell to its own max1555..

maybe using a small C to do the switching.. or some simple logic.


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