
DS3105
121
13. Thermal Information
Table 13-1. LQFP Package Thermal Properties, Natural Convection
PARAMETER
MIN
TYP
MAX
Ambient Temperature (Note 1)
-40
°C
+85
°C
Junction Temperature
-40
°C
+125
°C
Theta-JA (
θ
JA) (Note 2)
45.4
°C/W
Psi-JB
23.8
°C/W
Psi-JT
0.3
°C/W
Note 1:
The package is mounted on a four-layer JEDEC standard test board with no airflow and dissipating maximum power.
Note 2:
Theta-JA (
θ
JA) is the junction to ambient thermal resistance, when the package is mounted on a four-layer JEDEC standard
test board with no airflow and dissipating maximum power.
Table 13-2. LQFP Theta-JA (
θ
JA) vs. Airflow
FORCED AIR (METERS PER SECOND)
THETA-JA (
θ
JA)
0
45.4
°C/W
1
37.3
°C/W
2.5
34.5
°C/W