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TPS7B69-Q1: Junction temperature calculation

Part Number: TPS7B69-Q1

Hi Experts,

My cusotmer want to evaluate the junction temperature of TPS7B69-Q1 on their PCB, so they glue a thermalcouple wire on the top of the package(without heat sink) and get the temperature Tc. In this application, which fomula should be used to calculate the junction temperature Tj? My understanding is the first one is more suitable here, right?

1. Tj = Tc+ψJT*Power

2. Tj = Tc+RθJC*Power