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Check out the Electro-ramblings blog for a circuit design for Li-ion charging.
Specifically, it is a post from 'Alice' in the 'Engineer in Wonderland' series, covering use of the Linear LM317 variable output voltage regulator to charge a 12V battery.
The post begins:
Read An Engineer in Wonderland - Li-ion charging with an LM317
Specifically, it is a post from 'Alice' in the 'Engineer in Wonderland' series, covering use of the Linear LM317 variable output voltage regulator to charge a 12V battery.
The post begins:
There are an awful lot of Li-ion charging chips out there, and you would have thought there was one for every eventuality.
But it turns out there isn't.
For example, there is a sort of no-designer's-land between 6.5V where linear Li-ion chargers top out - although Linear's LTC1734 works up to 8V - and around 12V where switching chargers start.
And even without an input voltage restriction, what if you don't want to charge the thing at less than 4.2V?At this point, please make sure to read and understand the safety note at the very bottom of the post.
Read An Engineer in Wonderland - Li-ion charging with an LM317
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