I am using the ADIsimPower ADP238x tool for an ADP2381 buck design. The "Thermal Performance" block on the spreadsheet shows the package thermal resistance is ~183C/W, but the device data sheet shows this is really 39.48C/W. The higher number is used to calculate temp rise at the regulator, which (I believe) is now incorrect.
Can the parameter on the tool be corrected? Have I missed something fundamental?