Thank you for your advice. You're right but I need current limit at discovery board . I would like to use this buck converter other sensor interfaces.

You're right also any component don't have AEC qualified. But this design is demo for my thessis. If it is not stabil applcation I will design new control card instead of discovery board. Also I didn't get any component abroad for Covid 19. Thank you...

You're right so I'm confused about component selection. Also I would like to use buck converter. Do you suggest LDO or switching buck converter ?Thank you for information

Thank you so much :)If usb 2.0's current enough this card I will calculate the this card need 500ma if extra situation happened.

Thank you ,Please read carefully. I didn't see anywhere input current specifications.  Board power supply: through USB bus or from an external 5 V supply voltage  External application power supply: 3 V and 5 VPower supply and power selection The po...