STM32H745 - unused SMPS pins

[Joe.H]

I don't use the internal Step Down regulator. How should the pins be tied?

Should VDDSMPS be tied to VDD and VSSSMPS to GND with VLXSMPS and VFBSMPS left open?

OR - should they ALL be left open?

Documentation only speaks as if they are to be used - no comments on what to do if not used.

[TDK · Accepted solution]

This app note for STM32H7A/B shows them as grounded/floating. Can't imagine it's different for the H745.

 

 

https://www.st.com/resource/en/application_note/an5307-getting-started-with-stm32h7a37b3-line-and-stm32h7b0-value-line-microcontroller-hardware-development-stmicroelectronics.pdf

[Joe.H]

Thanks

[Moritz_]

Hi,

is the same solution possible for the STM32H747XIH6?

I want to fully bypass the internal LDO and SMPS.

Thank you-

[SofLit]

 STM32H747 and STM32H745 have the same config from power settings point of view.

[Moritz_]

Thank you very much for the fast help.

[Moritz_]

Just to be sure, (since the datasheet of the STM32H747 does not mention it) VDDLDO and VCAP are connected in the LDO bypass scenario ?