LTC3410 POWER EFFICIENCY

HI

I am using LTC3410 to generate a 1 V output voltage from a 3.3V input. load current is about 30mA. according to datasheet I expect to have a efficiency of 90%. however I am only achieving 75% of efficiency under this condition. I amusing a 0805 inductor of 4.7uh as in your application diagram and layout looks like no issue

on figure 3 of datasheet, at 30mA load current, there is about 5mW power loss, what causing this 5mW loss? the switch on resistance is less than 1 ohm, the inductor DCR is about 0.2 ohm and the current is 30mA, how to come out 5 mW and how to reduce this loss?

can you point out what could be wrong and where to check?

thanks

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