When selecting the current limit resistor we most account for the accuracy of the limit. The accuracy on the range of the desired current limit is ± 20 %.

As the current limit can be shifted up to -20%, is desired to boost the load current by this factor. In which case the load current for the calculation of the current limit is: 1.375 A.

To keep the 1.1 A nominal current in the 0 to 4 V current-sense range, calculate the R_CS resistor using Equation 17. To achieve better current-sense accuracy, a 1% tolerance or better resistor is preferred.

To set the adjustable current limit value at 2.5 A, calculate R_CL using Equation 18.

TI recommends R_S = 10 kΩ for 5-V MCU, and R_PU = 10 kΩ as the pullup resistor.