li-ion battery charging

[electrophile]

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,

1. Should be able to stop charging after they are fully charged
2. Should be capable of a trickle charge
3. Low cost and low part count
4. High charge efficiency

 

[amayilsamy]

Once you confirm it. You are using Li-ion or Li-Po Batteries.

https://www.ti.com/product/bq24100

The above link is Li-Po charger ICs from Texas Instruments .

But it is need more components

 

[electrophile]

Thanks! The batteries I'm using are Li-Ion.

 

[amayilsamy]

http://www.analog.com/library/analogdialogue/archives/31-2/liion.html

http://www.ti.com/lit/ds/symlink/lm3420.pdf

The above links Linear Chargers.

http://isa.umh.es/temas/micros/doc/datasheets/MAX745.pdf

The above link switch mode charger controller from Maxim Integrated.

Switch mode controllers more efficiency then Linear controllers.