Good Buck Converter driver IC for Arduino

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.

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Why? Its my final degree project. Im just looking for a recommendation for a driver IC guys :blush:

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 :blush: 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

For example

And …

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.