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BQ25750: BQ40Z80

Sumeet Patil
Prodigy 210 points
Part Number: BQ25750
Other Parts Discussed in Thread: BQ25756, TPS25751, BQ40Z80, BQ25758

Tool/software:

Hello TI,

I am looking for battery management system with charger that is to be connected to USB, the battery is LIPO 6S, 22000 mAH, and I will be charging the battery at 1C rate. Please suggest me whether BQ25750 is suitable part or you can suggest me another alternative.

I also need balancing and fuel gauge capability with battery monitoring and protection for my BMS. Fuel gauge and battery monitor will be on system side.

The battery to be used is below one:

lipobattery.in/tattu-22-2v-25c-6s-22000mah-lipo-battery-with-as150-xt150-plug.html

Along with that Battery will be primary source, and I would need low power DC/DC converters that are operating 16V/10A, +15/5A and -15V/5A, 5V/5A and 3.3V/5A, 24V/5A. Please suggest suitable part and EMI/EMC guidelines for it.

You can connect with me through chat as well.

  • 0
    TI__Mastermind 23900 points

    Hello Sumeet,

    I think the BQ25750 or the BQ25756 would be the best match. I would recommend the BQ25756 over the BQ25750. I don't the BQ25750's traditional power path will be helpful to your application. Both the BQ25750 and the BQ25756 have a max charging current of 20A. To get a higher charger current, you can run 2 BQ25756 ICs in parallel.

    We made a reference design for the TPS25751 USB Controller and the BQ25756 that may be helpful. You can find that reference design here: https://www.ti.com/tool/PMP41062

    Let me know if you have any questions about the BQ25756. I'm going to assign this thread to the Battery Gauge team to recommend a battery gauge.

    Best Regards,
    Ethan Galloway

  • 0 in reply to Ethan Galloway
    Prodigy 210 points

    Hi Ethan,

    Can you let me know why traditional power path will not be helpful, I didn't understand it, my application is that battery will be providing power to the system for the most of the time except when the usb is plugged to battery charger then the system gets powered from the USB input. another thing I want to highlight is my system may lie dormant for many years, and then it will get deployed and during the dormant time battery will be powering the main peripherals that monitors the battery and other system parameters. Your valuable inputs are greatly appreciated.

    I look forward to hear from battery gauge team 

  • 0 in reply to Sumeet Patil
    TI__Mastermind 35041 points

    Hello Sumeet,

    The bq40z80 is the best fit for your application. I will assign this back to the charger group for your follow up questions.

    Regards,

    Nick Richards

  • 0 in reply to Sumeet Patil
    TI__Mastermind 23900 points

    Hello Sumeet,

    With the traditional power path, VBUS is connected directly to VSYS when a good power source is detected. However, the BQ25750 can't limit this current. If your system load while plugged in is too high, you risk crashing the USB power adapter.

    For the BQ25756, all the power flows through the converter and into the battery+system load. With this setup, the charger can regulate the input current and make sure that the USB adapter doesn't crash.

    Let me know if that makes sense and let me know if you have any other questions.

    Best Regards,
    Ethan Galloway

  • 0 in reply to Ethan Galloway
    Prodigy 210 points

    Thanks Ethan,

    Along with the above suggestion, can you suggest me good DC/DC converter for my required voltages, or can you transfer this case to DC/DC converter group

  • 0 in reply to Sumeet Patil
    TI__Mastermind 23900 points

    Hello Sumeet,

    I will move to this thread to the DC/DC converter group.

    By the way, if you need I2C control for your DC/DC converters, there is the BQ25758. The BQ25758 is a DC/DC converter that can output 0V to 60V at 20A.

    Best Regards,
    Ethan Galloway

  • 0 in reply to Ethan Galloway
    TI__Mastermind 31160 points

    Hello, 

    can you please narrow down the question to DC/DC group so we can help better?

    what is VIN Nominal and Max? out current and voltage range? Over current protection needed? any digital needs (PMBUS, I2C)? ...etc. 

    Thanks! 

    Tahar