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Author Topic: Simple battery management  (Read 3535 times)

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Offline scratTopic starter

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Simple battery management
« on: March 04, 2011, 03:08:21 am »
Hi all,
I'm after a small accelerometer acquisition board which needs to be powered at 3.6V in turn from USB or a battery.
Since I'd like to use a rechargeable battery and the tiny cell phone ones are quite cheap, I was planning to use a Li-ion battery, and to manage on the board the charging from USB power.

I see many management ICs, but they seem too complex for what I need: when USB power is present and battery discharged/not connected, then charge the battery and/or power the rest of the board, if there is only the battery, use its power for the system.

Is it really too much to ask for having all of this in a single (and simple!) IC, making voltage regulation at the same time?
I think this is a really common issue.
« Last Edit: March 04, 2011, 03:09:58 am by scrat »
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Offline Zyvek

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Re: Simple battery management
« Reply #1 on: March 04, 2011, 03:18:06 am »
Check this out, I just found it inside a cheap 18650 li-ion battery charger. 
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-Z
 

Offline Strube09

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Re: Simple battery management
« Reply #2 on: March 04, 2011, 01:05:48 pm »
Scrat,

Lets just say I know quite a bit about battery electronics... and there are quite a few option for you. Not sure how excited you are about a DFN package but check out LTC4067 from linear tech.... I think it is exactly what you need.

Strube
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Offline scratTopic starter

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Re: Simple battery management
« Reply #3 on: March 07, 2011, 11:22:41 am »
Thanks Strube fo the reply!
The only thing that I would have asked more was a less small package (the powerpad is always a trouble, but I see almost all of the linear battery chargers have one) and a regulator (but I see none of this devices having an output regulator).
I'll evaluate a little bit more some of the similar options from Linear and TI, but yours is a good candidate.
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One machine can do the work of fifty ordinary men. No machine can do the work of one extraordinary man. - Elbert Hubbard
 

Offline scratTopic starter

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Re: Simple battery management
« Reply #4 on: March 28, 2011, 11:35:32 pm »
Quote from: Zyvek on March 04, 2011, 03:18:06 am
Check this out, I just found it inside a cheap 18650 li-ion battery charger. 

Excume if I didn't add any comment. As from the datasheet, it is an isolated switching converter driver. It doesn't fit the need, although it can be used (as you say) as part of a battery charger.
What I was looking for was a tiny IC regulating a small amount of power, to be embedded into a small board ad a charge controller.

I ended choosing MAX1551 from Maxim, which is one of the few (to be honest, the only) coming in a usable package and being imple. Unfortunately, it lacks of a shut down/charge current control pin, but I think that it will be enough for my board.
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One machine can do the work of fifty ordinary men. No machine can do the work of one extraordinary man. - Elbert Hubbard
 
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