AAT4670
Dual-Input, Dual-Output Load Switch
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 RθJA to be
approximately 120°C/W. Using Equation 2:
To prevent thermal limiting, the operating load cur-
rent in the application must be less than 1.25A
which lies in the current limiting range. So, in this
application, any operating current below the cur-
rent limit threshold is allowed.
115 - 85
160m · 120
=
= 1.25A
IMAX
Eq. 3:
Timing Diagram
EN
OUT
t1
t2
t3
t4
4670.2006.09.1.4
9
AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
