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BQ76PL536A: BQ76PL536A-Q1 and BQ77905

JINHO BAE
Prodigy 30 points
Part Number: BQ76PL536A
Other Parts Discussed in Thread: BQ77905,

Dear Texas instrument

I want to question about
BQ76PL536A-Q1 and BQ77905.
We are designing BMS board using these two IC.

1. BQ76PL536A-Q1 supports up to6 cells. We are designing a system which has 20s. Is it possible to set each IC for 5 cells to stack?

2. After setting 5 cells for each IC like I mentioned above, is there no problem using using BQ76PL536A-Q1 and BQ77905 together?

I want to get answers for those 2 questions from you please.

Thank you.

  • 0
    TI__Genius 9401 points
    Hi Jinho,

    Yes. You can use bq76PL536A-Q1 for anywhere between 3 to 6 cells per device. Please see datasheet page 17 (7.3.1.2: 3-to-6 Series Cell Configuration) for explanation on how to connect the circuit when less than 6 cells are used.

    Regarding using bq76PL536A-Q1 and bq77905, it might be overkill to have both so just want to make you are aware that bq76PL536A-Q1 also has protection features like overvoltage, undervoltage and overtemperature and the thresholds are programmable. The difference is that bq76PL536A-Q1 will report the fault to the host microcontroller and then the microcontroller is in charge or taking any action needed, whereas the bq77905 will detect the fault and take an action itself.
  • 0 in reply to Leslie Marquez
    Prodigy 30 points
    Thank you for your answer.
    This design concept is compensating dual system when the MCU fails to control.
    And I need CHG/DSG FET Drive function, too.
    Is there a problem with this concept? I am looking forward to your advice.
  • 0 in reply to JINHO BAE
    TI__Genius 9401 points
    Hi Jinho,

    Thanks for the explanation. No, there's no problem, you can use both devices in your system.
  • 0 in reply to Leslie Marquez
    Prodigy 30 points
    Thank you for your kindness.