SNAS636C December 2013 – July 2021 LMK00338
This example shows how to calculate IC power dissipation for a configuration to estimate worst-case power dissipation. In this case, the maximum supply voltage and supply current values specified in Section 6.5 are used.
Using the power calculations from the previous section and maximum supply current specifications, we can compute PTOTAL and PDEVICE.
In this worst-case example, the IC device will dissipate about 803.8 mW or 85.6 of the total power (939 mW), while the remaining 14.4% will be dissipated in the termination resistors (135.2 mW for 8 pairs). Based on θJA of 31.4°C/W, the estimated die junction temperature would be about 25.2°C above ambient, or 110.2°C when TA = 85°C.