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LMR36503-Q1: LMR36503MSC3RPERQ1 - MODE/SYNC

Part Number: LMR36503-Q1

Tool/software:

Hello,

I have installed the LMR36503MSC3RPERQ1 in my assembly, this reference having a fixed output (+3.3V) and a fixed frequency (2.2MHz).

I'm now having problems with it, particularly using the MODE/SYNC pin.

I initially followed the ‘simplified diagram’ on page 1 by connecting the MODE/SYNC pin to the VCC pin, but it seems that this is affecting my output voltage value (measured at +2.1V).

I don't have this problem when I connect the MODE/SYNC pin to GND.

I would like to understand why?

I have other problems that I don't understand, but to discuss the project in more detail, I don't want to do it on the forum if that's possible?