In poorly regulated supply rails, it is very common to see high voltage surges. In these rugged environments, the supply rail can experience voltage transients that can be clamped with an external transient voltage suppressor (TVS) to prevent damage to the regulators downstream. An alternative is to use a high input voltage regulator such as the MIC28304 (up to 76V max) that can handle these transients, which eliminates the need for the TVS, saving board space and cost. In this example shown here, a 12V input voltage, with the output voltage set to 5V. A 12V surge up to 60V for under 30ms is applied to the input voltage. Channel one is AC coupled to see if there are any effects to the output voltage. The MIC28304 can operate with very little change to the output voltage. As can be seen, there is less than 20mV ripple seen in the output voltage.