STM32U585 external LDO

[JaMiro]

Hi,

what would be recommended way to override internal LDO which is used for VDD11/VCAP preparation? Because of thermal management, we prepared external LDO to lower internal MCU temperature. In H5 family, there was an BYPASS bit in PWR management. Maybe shall I change Vos to lower level to let higher level LDO win? Or would you have other way :)

 

Thanks!

JM

[KDJEM.1]

Hello ​@JaMiro and welcome to the Community;

 

Could you please share the full Part Number of the product used?

I recommend you to look at AN5373 precisely Figure 7. Power supply scheme for U535/545/575/585xxxxQ (with SMPS) and Figure 8. Power supply scheme for STM32U535/545/575/585xx (without SMPS).

I hope this help you.

Thank you.

Kaouthar

[JaMiro]

Hi, 

I’m using STM32U585QII3 so without SMPS. I’ve seen this diagram, but I’m looking for recommendations how to cut internal LDO from supplying VCORE line to use external one. 

[KDJEM.1]

Hello ​@JaMiro ,

 

According to the datasheet, there is no way to bypass mode and apply arbitrary voltage to Vcore domain.

 

Thank you.

Kaouthar