The LMK60EX is a high-performance device. Therefore, pay careful attention to device configuration and the printed-circuit board (PCB) layout with respect to power consumption. The ground pin must be connected to the ground plane of the PCB through three vias or more, as shown in Figure 9, to maximize thermal dissipation out of the package.
Equation 1 describes the relationship between the PCB temperature around the LMK60EX and its junction temperature.
To ensure that the maximum junction temperature of LMK60EX is below 105°C, it can be calculated that the maximum PCB temperature without airflow should be at 87°C or below when the device is optimized for best performance resulting in maximum on-chip power dissipation of 0.36 W.