M62281P/FP
Attention for heat generation
Although the absolute maximum rating of ambient temperature is spelled out as 85°C, it is always annoying to specify
the location this temperature refers to because the power dissipation generated locally in switching regulator is fairly
large and the temperature in the vicinity of the IC varies from place to place.
One of the recommendable ways to solve this problem is to check the temperature on the surface of the IC.
The difference in temperature between IC junction and the surface of IC package is 30°C or less when IC junction
temperature is measured by utilizing the temperature characteristics of p-n junction forward voltage, and the surface
temperature by "thermo-viewer" on the condition that the IC is mounted on the "phenol-base" PC board in normal
atmosphere.
This concludes that maximum case temperature (surface temperature of IC package) rating is 100°C with adequate
margin considering the absolute maximum rating of junction temperature is 150°C.
REJ03D0840-0201 Rev.2.01 Nov 14, 2007
Page 10 of 12
RENESAS [ RENESAS TECHNOLOGY CORP ]
