3

SCD8667 Rev C 3/17/14

Aeroflex Plainview

The maximum Power dissipation is limited by the thermal shutdown function of each regulator chip in the

VRG8667/8668. The graph above represents the achievable power before the chip shuts down. The first line in the

graph represents the maximum power dissipation of the VRG8667/8668 with one regulator on (the other off) and

the other line represents both regulators on, dissipating equal power. If both regulators are on and one regulator is

dissipating more power than the other, the maximum power dissipating of the VRG8667/8668 will fall between the

two lines. This graph is based on the maximum junction temperature of 150°C and a thermal resistance (

7°C/W.

FIGURE 2 – MAXIMUM POWER vs CASE TEMPERATURE