Regarding LTM8055 data sheet, I can see the output ripple noise is very low as follows.
However our customer measured the noise on the demo board DC2017A as follows. The ripple noise is 588mVp-p at Vout=12V, Iout=1.2A.
Off course the probe setting is as follows.
I think that the measurement setting might be different between ADI and the customer.
Could you please let me know the detail of the measurement setting on ADI side ?
Voltage ripple is usually measured with 20MHz bandwidth setting on oscilloscope channel. Kindly refer to application note for further reading.