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WEBENCH® Tools/LM2731: LM2731 efficiency calculation in WEBENCH

Part Number: LM2731

Tool/software: WEBENCH® Design Tools

Hi Team,

When simulating the LM2731 in WEBENCH, the working condition is: Vin= 4-8V, Vout=11V, Iout=30mA, the simulation result shows the efficiency is 91.9%.

However, if using LM27313, the simulation result shows efficiency is less than LM2731. It is only 75%. Why there is so big difference?