Datasheet

 2007-2013 Microchip Technology Inc. DS22057B-page 21
MCP1826/MCP1826S
5.3.1.2 Junction Temperature Estimate
To estimate the internal junction temperature, the
calculated temperature rise is added to the ambient or
offset temperature. For this example, the worst-case
junction temperature is estimated below:
5.3.1.3 Maximum Package Power
Dissipation at 60°C Ambient
Temperature
From this table, you can see the difference in maximum
allowable power dissipation between the TO-220-5
package and the DDPAK-5 package.
T
J
=T
J(RISE)
+ T
A(MAX)
T
J
= 30.12°C + 60.0°C
T
J
= 90.12°C
TO-220-5 (29.3° C/W R
JA
):
P
D(MAX)
= (125°C – 60°C) / 29.3°C/W
P
D(MAX)
= 2.218W
DDPAK-5 (31.2°C/Watt R
JA
):
P
D(MAX)
= (125°C – 60°C)/ 31.2°C/W
P
D(MAX)
= 2.083W