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BQ24610: Charge Current Accuracy

Peter James Miller
Guru 56795 points
Other Parts Discussed in Thread: BQ24610

A customer has sent me a question about the charge current accuracy of the BQ24610:

 

Hello Peter,


I am working with a Battery Charging System, and have a couple of questions I hope you can answer.   The data sheet lists +/- 3% for charge current, but I would like to significantly improve this accuracy.  I assume the  +/- 3%  value takes into account the variation of the reference voltage as well as resistor tolerances on the ISET and sense resistors, and probably other areas of the circuit I am not aware of.

1.) Taking the error contribution of the current sense resistor and ISET Value out of the equation,  what would your estimate of the accuracy of the charge current be using the 24610?

2.) What are the error contributions internal to the IC?  How tight is the Viset/(20*Rsr) current to Voltage formula, or the typical Error from the loop?

I am based in Massachusetts, if you are available, I would be interested in getting your thoughts on how accurate the charge current can be implemented using the BQ24610.

Thank you,

John
  • 0
    TI__Intellectual 2295 points

    The accuracy listed in the d/s is the error of the IC, not including the error of sensing resistor and V-ISET. It's over-temperature range 0-125C. The accuracy is better at room temperature. I'm curious why your charge system need a very high charge accuracy. Normally, battery is need a high accuracy charger voltage only.