STM32L552 SMPS hardware design

[Dmytro Medvid]

I have a question about connecting of the SMPS V15SMPS pins. From the datasheet we see, that the V15SMPS_1 and V15SMPS_2 pins are connected internaly. But, on the "Figure 6. SMPS step down converter power supply scheme" they are alco connected externally.

So, the question is: should I externally connect V15SMPS_1 and V15SMPS_2 pins on my PCB or not.

[Vangelis Fortounas]

Hello

One of the reasons that power pins are multiple is to well distribute flowing currents on silicon chip.

IMO both pins must be connected.

[Ons KOOLI]

Hi Dmytro Medvid,

V15SMPS_1 and V15SMPS_2 pins are already connected internally in the chip.

For the PCB, you should connect these pins externally.

Please refer to the AN5211 for more details (p33/40).

Best Regards,

Ons.