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How can I calculate the junction temperature of an LDO?
The maximum junction temperature of an LDO can be calculated from its power consumption and thermal resistance using Equations 1 and 2.
For example, suppose that VIN=1.5 V, VOUT=1 V, IOUT=200 mA, IB=20 μA, PD=0.6 W, and Ta=60°C. Then, the maximum junction temperature of the LDO can be calculated as follows.
Allow a sufficient temperature margin for the thermal design of an LDO application.
Also see the following documents and web page for a description of junction temperature: