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Battery Charger Solution/Recommendation

Genius 16129 points
Other Parts Discussed in Thread: BQ25798, BQ25720, BQ25723, BQ25792, BQ25713, BQ24610, LM317, LM3420

Hi Experts,

Customer is looking for a battery charger solution. Can you help? Below are their requirements:

Looking for a Lithium Polymer battery charger IC with a CC/CV profile for a 3s / 4s configuration. Important element : Vin is lower than the max battery voltage, and vary (10-14V for a 3s profile, 12-16V for 4s profile)

Additional Requirements:
- Maximum Charge Current : 400mA
- Charging Voltage Range (Min & Max) : 10-14V for a 3s .  12-16V for 4s. 
- Maximum Operating/Supply Voltage : 20v
- Control Interface (I2C, SMBus, Standalone/Hardware) : weight is critical (it's a drone back battery supply, so standalone would be the best)

Any suggestions you would like to offer is highly appreciated.

Thank you.

Regards,
Archie A.