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Original question:

Recommended currently active standalone Battery Charger IC for 4S Lithium Ion/LiPo batteries

BQ40Z80: 6s1p battery

Ryan Smith
Prodigy 10 points
Other Parts Discussed in Thread: BQ40Z80, BQ76942, BQ34Z100, BQ25756

Tool/software:

Hi experts!

I'm looking for a standalone LiPo solution for a 6s1p battery pack. This should mean charger, BMS, and fuel gauge.

As of now, I'm planning on using BQ40Z80 with BQ76942 to cover charging, monitoring, balancing, disconnect, and gauging. However, this doesn't seem to be standalone at all.

I have a 12V input and need a 24V supply for the load. That being said, an integrated Boost+Charger would be ideal, but I also need the BMS and Fuel Gauge to display remaining charge on an LED array. Any recommendations?

Thanks!

  • 0
    TI__Guru 60916 points

    TI does not have a combined gauge + charge BMS for 6s packs.

    You'd have to combine parts, like the bq40z80 with the bq76942 for a total solution.

  • 0 in reply to Dominik Hartl11
    Prodigy 10 points

    I decided to go with BQ7694202PFBR for the BMS, BQ34Z100PWR-R2 for the guage, and BQ25756ERRVR for the charger IC.

    These seem to be capable of running without an MCU, which is the goal of having "standalone" parts. Am I correct that I can use these without the MCU and I2C capability?

  • 0 in reply to Ryan Smith
    TI__Guru 60916 points

    You will need to program the bq34z100 at one point (so this will require an I2C host controller that can talk to the bq34z100). If you just want to use the LEDs to indicate SOC or SOH then you don't need a uC.

    I cannot say if the bq7694202 or the bq25756 can work without a uC (I'm not familiar with these products - please submit this question without the bq34z100 tagged so that it gets seen by the TI experts for these parts).