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bq25505 VBAT_OV threshold accuracy

K. Sasaki14
Guru 10200 points
Other Parts Discussed in Thread: BQ25505

On the bq25505 datasheet, VBAT_ACCURACY is +/- 2% with 0.1% resistors.
When 1% resistors are used, how is the accuracy?

According to my calculation, I think it becomes about +/-3%. Is this right?

Best Regards,
Kohei Sasaki

  • 0
    TI__Genius 12485 points
    Sasaki-san,

    Please use this app note to look at impact of resistor tolerances. www.ti.com.cn/.../slva423.pdf

    You can also calculate the VBAT range with the lowest and the highest of the two resistors.

    Regards,
    Gautham
  • 0 in reply to Gautham
    Guru 10200 points
    Gautham-san,

    Thank you for your answer.
    According to my calculation, the accuracy becomes -0.5% and +0.7% from VBIAS and resistor tolerance. However Electrical Characteristics is +/-2%. Thus I think we should add -1.5% ans +1.3% value to calculation result.
    So the threshold accuracy becomes +/-3.3% with 0.1% tolerance resistor.
    Is my understand correct?

    Best Regards,
    Kohei Sasaki