Power Supply requirments

[cmccoll2023]

Hi, 

I am looking to understand how best to size the power supply for STM32F413ZHT6

What is the maximum current that this processor could draw on the 3V3 rail? 

Cheers, 

[STM_Thirty2]

I recommend reading section 3.16 of the datasheet about power supply scheme, as well as application note AN4488 which has a lot of useful design information.

[Muhammed Güler]

On page 81 of the datasheet, it says that you can draw a maximum of 180 mA from the VDD and VSS pins.

After page 87, there are tables showing how much current each component will draw at which frequency and temperature. You can calculate the required power by adding the IO currents and the currents of the components you use. Add the current that other ICs will consume, if any. Don't forget to add a safety factor to the result you find.

Since even the cheapest LDOs provide a few hundred mA of current, your processor will work well even if you don't do a detailed current calculation.