The NR_SS capacitor acts as a noise reduction capacitor and a soft-start capacitor to slow down the rise time of the output. The output rise time, when using an NR_SS capacitor, is approximated by Equation 1.

In Equation 1, t_SS is the soft-start time in milliseconds and C_{NR_SS} is the capacitance at the NR_SS pin in nanofarads.

Figure 7-2 shows the start-up voltage waveforms versus C_{NR_SS}.