Omit C29 and L1 in STM32WB55RGV6 SMPS design ?

[EndyQSM]

Hello everyone,

I’m working on an electronic design using the STM32WB55RGV6, and the final product cost is very constrained.
I have a question regarding the SMPS components, specifically the capacitor C29 and the inductor L1 shown in the reference designs.

Are these components strictly required for proper operation, or is it possible to omit them when trying to reduce the BOM cost?
If they can be omitted, what is the recommended way to handle the corresponding SMPS pins on the MCU? Should they be left NC, tied to a specific level, or handled in another way?

Any guidance or official recommendation would be greatly appreciated.
Thank you very much!

 

[TDK]

If you're using SMPS, they are required.

If not using SMPS, they are not. See "Figure 10. Solution without SMPS (STM32WBx5xx products)"

Getting started with STM32WB MCU hardware development - Application note