Current Limited Load Switch
With typical specification of 125°C, 115°C is a safe
minimum value to use.
For example, if an application is specified to oper-
ate in 50°C environments, the PCB operates at
temperatures as high as 85°C. The application is
sealed and its PCB is small, causing R
θJA
to be
approximately 150°C/W. Using Equation 2,
AAT4612
Eq. 3:
I
MAX
=
T
SD(MIN)
- T
A(MAX)
R
DS(ON)(MAX)
· R
ΘJA
The AAT4612 is safe to operate at the maximum
current level of 0.93A at 85°C.
4612.2006.09.1.3
9