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STM32H745 - unused SMPS pins

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.

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TDKBest answer

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

"If you feel a post has answered your question, please click ""Accept as Solution""."

TDKBest answer

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

"If you feel a post has answered your question, please click ""Accept as Solution""."

Associate

Hi,

is the same solution possible for the STM32H747XIH6?

I want to fully bypass the internal LDO and SMPS.

Thank you-

ST Technical Moderator

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

To give better visibility on the answered topics, please click "Best answer" on the reply which solved your issue or answered your question.

Joe.HAuthor

Associate III

Thanks

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