In this case, DC DC switching regulator has 1 outputs configured to it. DC DC switching regulators like this one generate Fixed outputs on their output pins to handle the power management. It has a 6-pin voltage regulator dc to dc.
PXE30-48WS2P5 Features
1 outputs
PXE30-48WS2P5 Applications
There are a lot of TDK-Lambda PXE30-48WS2P5 Voltage Regulators applications.