The TPSM84209 is designed to operate from an input-voltage-supply range between 4.5 V and 28 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 TPSM84209 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 TPSM84209 additional bulk capacitance may be required in addition to the ceramic bypass capacitors. Typically, a 47-µF or 100-μF electrolytic capacitor is sufficient.