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TPS82084: TPS82084 operating junction temperature and thermal shutdown

Part Number: TPS82084

Hello,

Our application is as follows -

Input - 5V

Output - 1.8V 

Max load current - 1.2A

Based on the datasheet, RθJA Junction-to-ambient thermal resistance is 64.6 degree C/W. 

Based on the datasheet, thermal shutdown is at 150 degree C.

Power dissipation at full load P = (Vin - Vout) * Iout = (5 - 1.8) * 1.2 = 3.84 W,

and the junction temperature would be about

RθJA * P = 64.6 * 3.84 = 248.064 degree C.


Based on the above calculation, it seems the part TPS82084 would go into thermal shutdown for our application. Is this understanding correct ? If yes, could you please suggest an alternate part for our application requirement. Thank you