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bq24610EVM (HPA422 REV. B) Multi-cell connection ?

Robert Rinella
Prodigy 90 points
Other Parts Discussed in Thread: BQ24610, BQ76930

I purchase the bq24610EVM (HPA422 REV. B) . The documentation however implies that it is for multi-cell applications, the question I have pertains to the connection of the cells to the EVM board. I will be using LiPo's @ 3500 mAh in a 6s1p configuration. The schematic & documentation for the EVM provides no information as to connection of cell balancing / cells in series, single, or parallel configuration . Is balancing not required, and am I to series the batteries and connect the series output of the batteries (22.2VDC~) to VBAT and GND? Some guidance needed.

  • 0
    TI__Expert 5565 points
    Robert,

    You can connect the batteries in series or in parallel however you wish as long as the series voltage does not exceed the voltage rating of 21V on VBAT of the EVM. You can configure the EVM to accept higher voltage (up to 26V, by changing R28).

    The bq24610 is ONLY a charger and does not do cell balancing/protection. If you are planning on using unprotected cells in conjunction with this charger, I suggest looking into some battery monitoring/protection chips that we offer (like the bq76930). The bq76930 has cell balancing and protection features that might be of interest to you.
  • 0 in reply to Smriti B
    Prodigy 90 points
    Thank for the answer ! and sorry for the smart a$$ comment in my other post ;) I realize you guys are busy, but it's frustrating to us customers who need answers fast to keep clients happy. Okay enough of that... What should I change the R28 value to ? And by changing R28 , does this limit ( or raise ) the minimum input supply voltage- thereby committing me to a higher voltage input window?
  • 0 in reply to Robert Rinella
    TI__Expert 5565 points
    You can use equation 1 from the bq24610 datasheet (page 16) to determine the value of R28. As mentioned in section 11 (page 32) of the bq24610 datasheet, I recommend that your input power supply be ~1.5-2V higher than your max battery voltage so that you have enough headroom with all the voltage losses.