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Battery management IC selection for Licap/Supercap/Liion

Francisco González
Prodigy 150 points
Other Parts Discussed in Thread: BQ40Z80, BQ33100, BQ40Z50-R2, BQ33100EVM-001, BQ40Z50

Hi.

I'm working on a UPS and I need to prototype different battery chemistries solutions for backup. Backup is 12V 10W, 10Wh.

I have already a wide input/output buck-boost CC/CV for charging/discharging, but I need recomendation abot ICs for balancing, I2C/SMBUS gauging and protection.

Which ICs for a 2 to 5 Liion or LifePo4 would you suggest for pack protection, balancing and gauging? Is there any system compatible with these chemistries and Lithium Ion Caps?

Is it possible to configure BQ40Z80 for Lithium  Ion Capacitors?

Which ICs provides the simplest configuration for balancing and gauging Liion

Can I use bq33100 with a supercap pack directly charging and discharging via a buck/boost?

  • 0
    TI__Mastermind 42535 points

    Hi Francisco,

    The bq40z80 is not supercap compatible, you can use it for a 2-5s pack though. For a 2-4 pack our flagship is the bq40z50-r2/r3 and it offers easy configuration.

    You may be able to use the bq33100 with a buck boost, the gauge only concerns itself with the cap measurements.

  • 0 in reply to Batt
    Prodigy 150 points

    Thanks Batt, I will probably use a bq40zXX for LifePo and LiIon battery packs.

    About the bq33100: In BQ33100EVM-001 (the only reference design for bq33100 I found) charge from System PWR is controlled by CHG FET and discharge follows a different path to a load on CAPOUT. Can I use the same path for charging and discharging (with back to back MOSFETS or a similar solution)?

    I see that bq40zXX and more battery controllers provide high or low side charge/discharge drivers via  CHG and DSG pins, and I want to emulate that with supercaps with bq33100.

     

  • 0 in reply to Francisco González
    TI__Mastermind 42535 points

    Hi Francisco,

    I believe the different paths were done because of back drive issues.

    This gauge is very different from the bq40z50. I would suggest following the reference design if possible.