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Seemless battery / external power

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mat72

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I have a 5V device that can be powered externally or by a li ion battery. When external power is applied, I want to charge the battery.

Is there an off the shelf solution for this?

Thanks,

Matt
 
Are you sure it already doesnt charge it with the external supply?
 
Many of the companies which specialize in analog components like Linear Tech, Micrel, Maxim, and National Semiconductor have Li-Ion charging chips.
 
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