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 4-pin voltage regulator dc to dc.
REC15-2424SRW/H Features
1 outputs
REC15-2424SRW/H Applications
There are a lot of RECOM Power REC15-2424SRW/H Voltage Regulators applications.