The LMZ14202 device is designed to operate from an input voltage supply range between 4.5 V and 42 V. Use a well-regulated input supply that can withstand maximum input current and maintain a stable voltage. The resistance of the input supply rail must be low enough that an input current transient does not cause a high enough drop at the LMZ14202 supply voltage that can cause a false UVLO fault triggering and system reset. If the input supply is more than a few inches from the LMZ14202, additional bulk capacitance may be required in addition to the ceramic bypass capacitors. The amount of bulk capacitance is not critical, but a 47-μF or 100-μF electrolytic capacitor is a typical choice.