3.7V Li-Ion battery charger circuit


From the comments on our earlier standalone Linear Li-Ion battery charger with thermal regulation in ThinSOT app note post, Jan writes:

Nice chip, indeed. Unfortunately not easy to find stocked – here I can get it only from Farnell (5 euro + VAT a pop) or Digikey ($3/pc + VAT + import duties).
I would rather use something like MCP73831 – costs about 50 cents, same sort of package, but only 500mA max charging current. Which isn’t too big deal in most cases – USB can only deliver 500mA max by default …

More details on ElectroSchematics.

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  1. A no-brainer to me, I agree completely with this. Search Farnell (which minimizes shipping costs for me versus say Digikey) for Li-ion charger ICs and Microchip parts looks great for the cost conscious and non-solder paste user.

    1. That’s a really weird thing to say, because the data sheet should have more than enough for you to work on. For these kinds of parts (linear Li-ion chargers, 6-8 pins) their functionality is really quite simple, and as such, the circuit examples in the data sheet more than suffices.

    1. well…..its good …….

      i want to know that, how can we charge three 3.7v lithium ion batterys by using mpc73831 charge controller… anyone having circuit?

      1. It’s a simple matter using MCP73831 if you are charging them separately, _however_, if you are trying to charge a 3-series pack (11V) then there is a need to handle charge balancing. IIRC Linear Technology has plenty of parts that charge multiple cells in series, their data sheets are often *very* useful and is good reading. The 3-parallel case is uncommon.

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