What the TPS2358RGZR does on the backplane
The TPS2358RGZR is a dual-slot AdvancedTCA (ATCA) hot-swap controller from Texas Instruments, designed to manage the inrush current and power sequencing for two ATCA card slots on a backplane. In an ATCA shelf, each blade draws from a -48 V backplane; this controller ramps the output voltage on insertion, preventing the bus from glitching and the upstream breaker from tripping.