<Moved from this thread.>
Just to confirm, did anyone else got success by using:
for STM32H745, to safely power the uC with just LDO no SMPS ?
All of the power schemes given in the reference manual are functional and can be used to power the chip, including the one you show.
The picture you showed is Bypass mode, not powered from the LDO. This means you have to generate the correct VCAP voltage externally. This works but is not common.
If you want the standard LDO configuration, it can be seen on the top left.
