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Need suggestion whether it is okay to use this IC for my requirements

Category: Hardware
Product Number: MAX8655

In my power supply design i am using MAX8655 for converting 12V to 5V

this 5V input is given to all other supplies in my design ,So i am getting nearly 6A load on MAX8655 output i.e 5V.

Now i would like to do thermal analysis for MAX8655 but in datasheet i have not found thermal resistance from Junction to Ambient so how can i do thermal analysis...help me out ..