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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.

Absolute maximum rated junction temperature specified

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.

From Equation 1, power consumption (P) is calculated as follows:

Power consumption

From Equation 2, the maximum junction temperature is calculated as follows:

Absolute maximum rated junction temperature specified

Circuit diagram

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:
For other LDO regulators, visit the main web page of LDO regulators at:
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