Hello,
Section 8.6 in the REF35 datasheet explains how to find the maximum power dissipation:
Using equation 3, the power dissipation is dependent on the junction temperature:
PD = (TJ - TA)/RθJA
The maximum junction temperature should not exceed 170°C, which is the absolute maximum storage temperature rating.
Therefore, pulling from the REF35 datasheet sections 7.1 and 7.4 to find the values for the other variables in equation 3, we can find that the max power dissipation should be calculated at the maximum junction temperature, which gives approximately:
PD(max) = (170°C - 25°C)/(164.4°C/W) = 0.882 W
Assuming TA is 25°C. Make sure to adjust this equation for the ambient temperature that applies to your circuit.
Please let me know if you have any other questions.
Thanks,
Jackson
