The TPSM84A21 is designed to operate from an input voltage supply range between 8 V and 14 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 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 TPSM84A21, additional bulk capacitance may be required at the input pins. A typical recommended amount of bulk input capacitance is 47 μF - 100 μF.