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STM32H725RGV6 - How to connect SMPS when no available VDDLDO

NirAlon
Associate II

Hello all,

In my design, I wish to use the STM32H725RGV6 (VFQFPN 68pin)

In this package, there is no embedded LDO.

There is no explanation or design example for the use the embedded SMPS in this package...

should I connect the SMPS output directly to VCORE?

Thanks

Nir

 

1 ACCEPTED SOLUTION

Accepted Solutions
KDJEM.1
ST Employee

Hi @NirAlon ,

 

Thank you for updating post and for your comment.

Yes , you are right, the VCAP pin is available in VQFPN68 package.

KDJEM1_1-1728568562963.png

 

It is correct, when LDO is disabled 100 nF close to each VCAPx pin.

KDJEM1_0-1728568363085.png

Is your request being answered?

Thank you for your contribution in STCommunity.

Kaouthar

 

To give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.

View solution in original post

3 REPLIES 3
KDJEM.1
ST Employee

Hello @NirAlon ,

 

When VCAP and VDDLDO is not available on a package you do not have to take care of it.

On VQFPN68 package all needed connection for VDDLDO is made internally, there is no choice has only SMPS configuration is allowed.

Please take a look at AN5419 figure 2, table 2. and table 30 in RM0468 may help you for power supply connection.

By configuring the SMPS step-down converter and LDO voltage regulator, the supply configurations shown in the below figure are supported for the VCORE core domain and an external supply.

KDJEM1_0-1728565397483.png

KDJEM1_1-1728565484078.png

 

Thank you.

Kaouthar

To give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.

Hi Kaouthar,

Thanks for the quick response!

A small correction, the VQFPN68 package does have a VCAP pin, the VDDLDO is not available.

Just to make sure I understood you, the configuration for VQFPN68 should look something like this?

NirAlon_1-1728567477197.png

Thanks again,

Nir

 

 

KDJEM.1
ST Employee

Hi @NirAlon ,

 

Thank you for updating post and for your comment.

Yes , you are right, the VCAP pin is available in VQFPN68 package.

KDJEM1_1-1728568562963.png

 

It is correct, when LDO is disabled 100 nF close to each VCAPx pin.

KDJEM1_0-1728568363085.png

Is your request being answered?

Thank you for your contribution in STCommunity.

Kaouthar

 

To give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.