I'm at the beginning of a project that needs a battery charger chip for a 2-cell (18650 Li-ion cells) application. The batteries won't be replaceable. I found the LTC4162 chip but will I also need a cell balancing function? So my question is: will the LTC4162 work best? I have a micro-controller in the system so the i2c connection shouldn't be a problem.
Bonus points - any suggestions for a coulomb counter chip that might work with the charger chip?
Thanks in advance,
LTC4162 sounds like a good choice for the battery app except that it does not have a balancing function. However, the balancing could be handled externally using an additional IC or possibly discrete circuitry.
As for your need for a coulomb counter, you may want to also consider LTC4015 which is very similar to LTC4162 but has an integrated coulomb counter.
That said, taking price, board space, and complexity into consideration, you may still want to consider using LTC4162 with an external coulomb counter (LTC2943 is a good fit for your app). This could make sense since LTC4162 + LTC2943 are comparable (slightly cheaper) in price compared to LTC4015, and the LTC4162 has a much simpler/smaller solution size.