The LMZ34202 is designed to operate from an input voltage supply range between 4.5 V and 42 V. This input supply should be well regulated and able to withstand maximum input current and maintain a stable voltage. The resistance of the input supply rail should be low enough that an input current transient does not cause a high enough drop at the LMZ34202 supply voltage that can cause a false UVLO fault triggering and system reset.

If the input supply is located more than a few inches from the LMZ34202 additional bulk capacitance may be required in addition to the ceramic bypass capacitors. The typical amount of bulk capacitance is 47 µF or the typical amount of electrolytic capacitance is 100 μF.