I'm a DFAE in Japan. I try to recommend LTC3376 to the customer. I'd like to know the difference between Tj and Die temperature. If the power dissipation each channel would be 1W in other words total power dissipation as 4W, could Tj at Ta=60degC be calculated 4W*35degC/W+60degC=200degC>125degC ? The customer's spec is as follows. Is it impossible to implement ?
use CFG(3:0)=0000. Vin=12V. Ta=60degC. Buck1 & 2 for Vo=6V, Io=2.4A. Buck3 for Vo=5.8V, Io=1.7A. Buck4 for Vo=6.5V, Io=1.6A.
I estimate the total dissipation is 3.43W. Then Tj at Ta=60degC could be calculated about 180degC. Therefore is it impossible for us to recommend LTC3376 to the customer ?