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LMR51606: LMR51606XFDBVR

Part Number: LMR51606

Tool/software:

Hello Support.
I've just routed a new board using the LMR51606XFDBVR, for me first time use. I calculated the resistor divider network to use resistors I have in stock and I'm using Rfbt = 15K / Rfbb = 2K7 to give a calculated Vout of 5.25V but instead of which I'm getting 2,546V. I measure the Vref of the part and it's 0,414V. The datasheet gives that as 0,8V.

What could be the problem?

Regards,
Larry.