PMIC for multi-rail systems — what the TPS658621AZGUT-1 is
The Texas Instruments TPS658621AZGUT-1 is a power management IC (PMIC) from the TPS658 base product family, designed to integrate multiple voltage rails and sequencing for a system-on-chip or application processor in a single device.
Procurement is through the independent distribution channel via a broker or surplus supplier, with date-code and authenticity verification recommended.
Replacement and second-source options
A replacement would require evaluating a current-production PMIC from the TPS658 family or a functionally similar multi-rail power manager from another TI series, with a board respin likely.