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Hi every body In STm32f407 discovery board there is LD3985M33R regulator which the output is 3.3v but in schematic that ST has released it is labeled by 3 volt why? I know LD3985M30R output is 3v not LD3985M33R

Yas Yasin
Associate II

‎2018-12-28 09:45 AM

 
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Bob S
Principal

‎2018-12-28 10:11 AM

Because "3V" is "close enough"? :) Actually because there is a series diode between the 3.3V regulator and the "3V" net (a BAT60), and the diode drop is nominally 0.3V.

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