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LiFePO4 battery protection IC

Martin Palenkic1
Prodigy 40 points
Other Parts Discussed in Thread: BQ2980

Hello all,

I'm designing a board that will use only one LiFePO4 cell, so 3.2 V. It is ideal because it will be charged up to 3.5 V so I do not need any dc-dc converter to power up my uC.
I have looked at BQ2970 but it has too high over voltage protection. My battery supplier specified it's cells at 3.65 V max for charging. So I'm affraid 3.8 V is a bit too much, as I do not want to degerade the cells or risk a fire hazzard in case batteryes get overcharged. 
Another thing is that they will be charged with low current of about 100 mA - 300 mA for 10 Ah battery pack. So in the case my solar charger starts overcharging the batteryes, it would take a lot of time before battery voltage rise up to 3.8 V for BQ2970 to detect it.
Is there any way to manually set OV protection for a single cell sistem or does anyone know some other IC that can do that?

Big thanks

Martin

  • 0
    TI__Expert 7285 points

    Hi Martin,

    All of our protection ICs are preprogrammed by the TI factory and cannot be configured by the customer. You can also take a look at our other 1S protector, the BQ2980 and see if there is a version that meets your requirements. We can create new configurations of the BQ2980 if there is a business need. If you wish to pursue that option, please reach out to your local sales representative. 

  • 0 in reply to Shawn Hinkle
    Prodigy 40 points

    Hi Shawn,

    Thank you. Unfortinetly BQ2980 will not work for my application.
    It would be great if you could make a version of BQ2970 or BQ2980 that can be used with LiFePO4 batteryes. BQ2970 with 3.85 V OVP could almost do it, but there is still a 200mV gap because LiFePO4 batteries require 3.65 V max for charging.

    Thank you for your time and assistance.

    Martin