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BQ24133 - the width of output-voltage

Dice-K
Mastermind 6330 points
Other Parts Discussed in Thread: BQ24133

Hello,
I use 3-cell-battery. I connect VREF-terminal and CELL-terminal.
CELL-terminal is 3.3V.
The output-voltage becomes like this then.
 board-1   12.6V
 board-2   13.7V
 board-3   13.3V
Is this width correct?
Only TYP is written as 12.6V on page-7 of the data-sheet.
MAX is written as 13.5V on page-6 of the data-sheet.

Regards,
Daisuke

  • 0
    TI__Genius 13700 points

    Hello Daisuke-san,

    With the cell pin pulled to Vref it shoudl regulate to a target voltage of 12.6V with an accuracy of +-0.5%. This would make the max expected variation at the SRN pin to be approximately 12.66V

    Where are you measuring the voltage on the board? Is it right at the SRN pin of the BQ24133?

    In fact for the case of Board 2 and Board 3 the Bat OVP should be triggering at 13.1V.

    What else do you have attached the battery rail?

  • 0
    TI__Expert 3160 points

    Hi Daisuke,

     

    I wanted to follow-up on this inquiry and see if you were able to resolve the issue.  If you still have concerns, please let me know and we can find the solution.

     

    Thanks!

    Rachel