POWER SUPPLY QUERY

[seezar]

I am trying to design my own microcontroller and I am following this video  here the guy is using the ams1117 as his linear regulator which has a current output of 1 A, wouldn't this fry the MCU? I read the datasheet for the stm32f405 and in the min/max section it is said that Total current into VDD power lines should be 240mA. I am also looking into using the stm32u5 series the data sheet in that case also says Total current into VDD power lines should be 200mA.

[Tesla DeLorean]

>>wouldn't this fry the MCU?

That's not how Current works..

 

You have a supply CAPABLE of sourcing 1A, your MCU takes 200 mA in it's usual operations, that means 800 mA is AVAILABLE for other LOAD that presents.

[Melc_dB]

Hello @seezar,

 

To complete @Tesla DeLorean's response, you can take a look at this wiki page: https://wiki.st.com/stm32mcu/wiki/Basics_of_power_supply_design_for_MCU

It may gives you more informations about designing power supplies.

 

Best regards,

Melchior