RT9166B Datasheet, PDF (8/9 Pages) Richtek Technology Corporation – 600mA, Ultra-Fast Transient Response Linear Regulator

RT9166B
P_D(MAX) = (125°C − 25°C) / (60°C/W) = 0.847W for
SOT-89 package
The maximum power dissipation depends on operating
ambient temperature for fixed T_J(MAX) and thermal
resistance, θ_JA. For RT9166B packages, the derating curve
in Figure 1 allows the designer to see the effect of rising
ambient temperature on the maximum power dissipation.
1.00
Four-Layer PCB
0.90
0.80
0.70
0.60
0.50
0.40
0.30
0.20
0.10
0.00
0
25
50
75
100
125
Ambient Temperature (°C)
Figure 1. Derating Curve for RT9166B Package
www.richtek.com
8
DS9166B-01 April 2011