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They wrote this formula in the datasheet for a good reason.
What makes you think it is not correct?
And from the formula (wihtout reading the datasheet) it´s clear what the calculate:
* quiescent power dissipation: (V_in x I_q)
* DC power dissipation of the MOSFET: (I_load x V_sat)
* duty cycle of MOSFET: (V_o / V_i)
For sure one could dive deeper into power dissipation, but for a raw estimation it is a good start.
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