MCP1825/MCP1825S
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:
TJ = TJRISE + TA(MAX)
TJ = 15.06°C + 60.0°C
TJ = 75.06°C
5.3.1.3
Maximum Package Power
Dissipation at 60°C Ambient
Temperature
TO-220-5 (29.3°C/W RθJA):
P
D(MAX) = (125°C – 60°C) / 29.3°C/W
D(MAX) = 2.218W
P
DDPAK-5 (31.2°C/Watt RθJA):
P
D(MAX) = (125°C – 60°C)/ 31.2°C/W
D(MAX) = 2.083W
P
From this table, you can see the difference in maximum
allowable power dissipation between the TO-220-5
package and the DDPAK-5 package.
DS22056B-page 22
© 2008 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
