SLVS181J December 1998 – September 2019 TPS763
Specified regulator operation is assured to a junction temperature of 125°C; the maximum junction temperature allowable to avoid damaging the device is 150°C. This restriction limits the power dissipation the regulator can handle in any given application. To ensure the junction temperature is within acceptable limits, calculate the maximum allowable dissipation, PD(max), and the actual dissipation, PD, which must be less than or equal to PD(max).
The maximum-power-dissipation limit is determined using Equation 3.
The regulator dissipation is calculating using Equation 4.
Power dissipation resulting from quiescent current is negligible.