Can your PMICs support power sequencing? Can they manage both power up sequence and power down sequence?
Most MPS PMICs include power up and power down sequencing. The sequence is programmed at the factory. Each power rail can be assigned any power up sequence (order) and the power down sequence is typically the reverse order as the power up. Please refer to a typical example shown in the test report: https://media.monolithicpower.com/mps_cms_document/v/e/versal-evb-evref0105a-test-report_190910.pdf?_ga=2.252101321.1368130010.1593447439-780566556.1463092530.