The TPS6521855 has a predefined power-up and power-down sequence, which does not change in a typical application. The user can define custom sequences with I²C. The power-up sequence is defined by a series of ten strobes and nine delay times. Each output rail is assigned to a strobe to determine the order of enabling rails. A single rail is assigned to only one strobe, but multiple rails can be assigned to the same strobe. The delay times between strobes are between 2 ms and 5 ms.