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Figure 10. Thermal Impedance

Considering a pulse duration of 1sec, the thermal impedance is close to 20°C/W, allowing much bigger power

dissipated.

Example:

Vin = 3.3V

Vout = 1.8V

Iout = 2A

Pulse Duration = 1sec

The power dissipated by the device is:

Considering a thermal impedance of 20°C/W, the maximum junction temperature will be:

Obviously, with pulse durations longer than approximately 10sec the thermal impedance is very close to the

thermal resistance (60°C/W to 70°C/W).