Hi guys, Im looking for a driver IC for a buck Converter topology. I want to reduce 20-21V to 7.4V in order to charge a 2S battery 910mAh.
Can you recommend me a good driver IC to use with Arduino? The frequency of the Arduino's PWM will be 31.5 Khz.
Thanks in advance!
What is Your experience of building chargers? So far I fear it will be a battery destructor.
Its my first time. I will control the current with Arduino via INA219, and also I will set a maximum limit current via hardware also to not damage the battery.
This project is not for a newbie, use a commercial charger.
Why? Its my final degree project. Im just looking for a recommendation for a driver IC guys 
Commercial chargers are a dime a dozen and have been engineered to be safely operated to prevent fires etc.
Edit
Look into the LT3650.
Your charger also needs to consider balance between the cells , constant current then constant voltage phases , then knowing when to stop charging .
Measuring battery temperature and also separate protection for under and over voltage .
Not too easy , study the battery chemistry and how to charge and maintain the batteries first !!
I have a TMP36 in my system, also a heater (if needed), and also I have studied UVP and OVP But Im available to hear recommendations!
Also, my battery is a LiPo 7.4V 2S
I think the recommendations are buy a charger as it’s not a simple project as you need to enact the items I mentioned
Making recommendations that can lead to destruction are never a good idea.
Mouser.com has a chat for finding the correct IC for an application.
For a Li-ion charger, you want a sort of constant-current, constant-voltage supply (plus temperature measurement, timers, and maybe balancing circuitry. Although perhaps some of that is in other parts of your battery system.)
I think most Buck Converter chips are designed for one or the other (CV for most of them, CC for LED drivers.) Or, there are dedicated battery-charging ICs. (heh - Deja Vu - for my Senior design project I had planned on using an R/2R ladder and a comparator to implement an ADC, and my advisor advised "just buy an ADC chip.")
You might want to do a bit of searching for the base circuit for those cheap "lab" power supplies that have show up relatively recently, like https://www.amazon.com/Converter-Regulator-Adjustable-Regulated-Laboratory/dp/B0978T3JKH
They seem to feature microcontroller control, and have had some favorable reviews.
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