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Power consumption of LTC7810

I am using LTC7810 to design a synchronous buck converter to step down voltage from  72V battery to (channel 1 at 4.2V, 2A) and (channel 2 at 12V, 1.233A). I am using LTSpice for simulation. I have designed the buck converter to operate in pulse skipping mode due to load requirements of a GPS module. From the simulation, the LTC7810 is consuming around 6.5W. Is this normal? 12V step down buck regulator.ascI have tied the EXTVcc pin to the output of channel 2 so as to power the DRVcc pin. Might this be the problem? Pls help me out