For STM32L552 with external SMPS (variant P). This variant has dedicated pins for VDD12 external power supply, but suppose I did not wish to use this SMPS, instead using the standard linear regulators. How do I connect the two VDD12 pins as unused?

[TDK · Accepted solution]

The datasheet indicates they're not connected when LDO is used, in which case you can leave them floating.

 

https://community.st.com/s/question/0D53W00000qwAkTSAU/external-smps-vdd12-pin-supply-required