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Original question:

BQ25170: does output voltage accuracy depend on resistor tolerance?

BQ25170: Output V accuracy and VSET resistor tolerance

Shuhei Goto
Expert 5030 points
Part Number: BQ25170

Hi team,

The accuracy of output V is +/- 0.8% with +/- 1% tolerance VSET resistor.
If this resistor is changed to tolerance +/- 0.1% one, will accuracy of output V improve?

Best regards,
Goto

  • +1
    TI__Guru* 75956 points

    Hi Goto

    The VSET resistor vs output V tolerance, they are independent.  Tighter tolerance VSET R will not increase output V tolerance.  

    VSET resistor is read at start up, current pulse that generates a voltage that is measured. The voltage will correspond to 1 of 8 preset voltages.

    More of a digital or Bin system, not so much analog.