5V - 12V step-up and simple 5V "smart" battery charger circuit

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jamikKim

Joined Mar 7, 2010
1
Hello all,

I have a few cheap circuits I would like to make:

The first is a 5V to 12V step-up converter; I found one here... This one should be easy enough, and I only need about 2W max. power from it. The power input is 5V 890mA from a phone wall ps.

Using the same "charger", I would like to make a cheap, simple circuit that can detect when a 3.7V Li-ion battery is charged and hence stop charging at that point. These seem very interesting. Which one would you recommend? :)
 

retched

Joined Dec 5, 2009
5,207
The LTC4054 is a great little charger.

It is true to the post. SIMPLE. It has a maximum charge current of ~750ma

So 1-hour or (fast-charging) certain cells will not happen. But it is better that you not concern yourself with such fire-worthy circuits yet.

I would build the first one in the post. Easy. Gets you experience points and soldering 'iron time'.
 
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