I'm trying to build a battery backup system for a door lock. I'm using the LTC4353 voltage monitor and switch that switches between the battery and a regulated DC supply depending on the AC mains availability.
Now I also need to charge the Li-Po pack and I was hoping someone could suggest me a suitable IC for this? The battery backup is 4, 18650 batteries in series (with a total voltage of 14.8 volts and current of about 2200mAh). I did a bit of research and found so many that I'm totally confused. The main criteria for the charger are,
- Should be able to stop charging after they are fully charged
- Should be capable of a trickle charge
- Low cost and low part count
- High charge efficiency