This application runs a Boost converter to output a regulated voltage at 5VDC through two selectable embedded loads.
A Voltage Mode control loop is applied to this Boost plant presuming a 2.5VDC input voltage.
Such input is obtained by halving the 5V provided by USBPD (or alternative user DC supply), through a Buck converter.
Please, note that this Buck converter is used with constant duty cycle (no control loop).
https://github.com/STMicroelectronics/STM32CubeG4/blob/c4132af65fe74ddd7f54aced85a0f4acce736405/Projects/B-G474E-DPOW1/Applications/Digital_Power/Boost_VoltageMode_HW/readme.txt#L2
It's running both a buck and a boost converter. The example is for the boost portion of this. There are other examples for the buck converter.
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