CH552E V33

[Rinat84]

If we look at the schematics, we will see that only the VCC line is switching there, and the +3V power supply is constantly connected to the V33, is it advisable to disconnect the built-in LDO?

[wagiminator]

Yes, that's intentional to keep the circuit as simple as possible. Overriding the LDO is not a problem.