What is the AD590 Theta JC?
The AD590 Theta jc for the 2-ld CQFP is approx 6degC/Watt (4layer board, 0 LFM/Natural convection) however this value is where the case is measured at the base of the package (i.e. the other side of where the die is attached within the cavity to minimise the thermal path, in the centre of the the 5.84mm NOM edge. The Theta jc for the 3-pin T0-52 is 26degC/Watt.
1. Linear Feet per Minute = Unit of Airflow Speed
2. Natural Convection (0 airflow)