The LMZ12001EXT device is designed to operate from an input voltage supply range between 4.5 V and 20 V. This input supply must be well regulated and able to 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 LMZ12001EXT 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 LMZ12001EXT, 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.