Absolute Maximum Ratings in the datasheet @ ADP5054 is following,
SWx to PGND : −0.3 V to +18 V
Is it input or output spec. ?
The output voltage ripple our customer observed is about -3V.
Like the Figure 6 @ UG-816 ADP5054-EVALZ User Guide .
Is it over voltage or not, −0.3 V > -3V ?