Author Topic: Looking for single chip solar MPPT + LiPo charging  (Read 1319 times)

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Offline sensoTopic starter

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Looking for single chip solar MPPT + LiPo charging
« on: March 30, 2017, 12:04:14 am »
Good evening, is there any single chip solution that will take the raw input from a solar panel in the 1-5Watts range(the ones I have preselected have typical voltages in the 4-5v range with maximum Vopen of 8-9v), for now I have found bq24650, but I have idea that Linear Tech had a couple chips that where designed for this.

The battery size is not super critical, it will be tested in a board(a wireless datalogger) that uses 20mA at 3.3v during 200ms for each transmitted data packet and around 8mA during 100ms for the data acquisition.

Thanks for your time, best regards.
 

Offline Seekonk

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Re: Looking for single chip solar MPPT + LiPo charging
« Reply #1 on: March 30, 2017, 05:24:35 pm »
If that is the chip I am thinking of, it really isn't MPPT.  They do temperature sensing to control the panel voltage.  If you already have a micro in your system, you might as well roll your own.  Sense the OC panel voltage and take 80% of that.  Lipo charging is pretty simple.
 

Offline sensoTopic starter

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Re: Looking for single chip solar MPPT + LiPo charging
« Reply #2 on: March 30, 2017, 08:54:45 pm »
There is a micro in there, maybe, I want to have a standalone pcb that I can add to the rest of the project(at least for now), so I can test it, and even if I end up with a micro in there it will be sleeping for hours, so it wont be able to nurse the MPPT, lipo charging IC's are cheap and TI as a lot of them, having a one chip solution would be neat, but its not the end of the world if I really need to use a couple IC's, but I would prefer to not end doing it with a micro, I dont trust my code lol.
 

Offline DavidMenting

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Re: Looking for single chip solar MPPT + LiPo charging
« Reply #3 on: March 31, 2017, 09:06:22 am »
Is the LT3652 the chip you were looking for?

Hooking up a 5/6V panel directly to a LiFePo4 and shutting it off once the voltage reaches 3.6V or so also works nicely.
 


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