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Lithium-ion charging schemes, or modules?

Eavesdropper
For an ongoing project of mine, I want to add energy storage to the system. I would like to use lithium-ion batteries for now, due to the joule density and price. However, I have never designed a charger for lithium-ion, or any battery for that matter, and need some guidance.
 
 
What are some schemes for charging?
Off the shelf products that I could just drop into a system?
Or links to some resources on the subject?
 
 
Some background on the project. I have an intermittent supply. I want to be able to charge the battery and run a load off the supply or battery at the same time.
 
 
Any help would be appreciated.
 
 
E
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  • Hi E,

     

    You might want to try a part like the LTC3101EUF#PBFLTC3101EUF#PBF.  This is designed to regulate several supplies, but has two inputs to the converter.  A charger/USB input and a battery input.  This is great because now the supplies powering your board will have minimal transients and the charger circuit does not have to talk to the regualtor at all and the hysteresis is handled for you.  Let me know what you think.

     

    If you are thinking of using supercapacitors, a part like the LTC3127 was made to regulate the input current to program the caps, and it is programmable.

     

    Let me know what you think.

     

    -Mike

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  • Hi E,

     

    You might want to try a part like the LTC3101EUF#PBFLTC3101EUF#PBF.  This is designed to regulate several supplies, but has two inputs to the converter.  A charger/USB input and a battery input.  This is great because now the supplies powering your board will have minimal transients and the charger circuit does not have to talk to the regualtor at all and the hysteresis is handled for you.  Let me know what you think.

     

    If you are thinking of using supercapacitors, a part like the LTC3127 was made to regulate the input current to program the caps, and it is programmable.

     

    Let me know what you think.

     

    -Mike

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