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Dual Cell Lipo Charging IC

Hey guys,

Can anyone suggest an IC that could be used to charge dual cell Lipo batteries (7.4V) with cell balancing? Ideally the IC would be powerful enough that it could charge even if the system is under a light load. I am looking for something similar to
the MAX 1555 IC (http://www.sparkfun.com/products/674) but for multiple cells. My google search has been fruitless - I must be using the wrong keywords. Thanks for any help!

PS I am not looking for a full charging system! I already have one. Instead I am trying to build one and was wondering if any IC other than a micro-controller exists to charge Lipos safely. Also don't suggesting trickle charging as it doesn't work with Lipos.

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I had the same idea earlier today (technically yesterday I suppose). I have not found an IC for it and would find it odd that no one like Sparkfun, Seeedstudio, or Adafruit sells a dual charger if it does exist like the common single cell ones. 

Wow, its a three-fer today! Hooray!

I have nothing to add but I want one too. I suppose the logical thing here would be to try to expand this conversation. I will shoot Red Box an email and you're down with Adafruit, Pat. Oh, I guess we will see them soon.


"...if any IC exists that is not a microcontroller..."

Hmmm... Why could it not be a micro controller? This is screaming picaxe 08m2 to me.

We gotta figure out how the charge cycle works and what this whole balancing thing is. I would think at it's core, we are talking some ADC's for volt and/or current monitoring, and an output or two going to some kinda power-transisor. Man, there has to be a nerd somewhere who has been waiting his whole life to explain this to us.

Yeah but there are already little tiny IC's that already have this all figured out that cost only a dollar or two, such as the MAX1555 for single cell batteries. I mean, you can take alot of effort trying to figure it out, but why not just spend a dollar?

Found the IC, a MAX1640, capable of charging LI-Ion, Li Poly, NIMH and NICAD batteries, anywhere from 2-16 cells, and 1-6 lipo cells


And i have some floating around! BREAKOUT BOARDS!

I think the MCP73213 is the chip to use, its dead simple to use:

Cheap, 10 pins too.

Beautiful. I am waiting for a board to buy from you...

Expect it as soon as I can find a 10 lead QFN package!

Krumlink once again you have proven yourself to be the IC guru! This is exactly the type of chip I was looking for. It's even simpler than I expected it to be! Thank you very much!

I just prowl through stacks of datasheets via the internets... Its what I do hehe :)