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WEBENCH® Tools/LM26420-Q1: LM26420-Q1 Efficiency problem

Part Number: LM26420-Q1

Tool/software: WEBENCH® Design Tools


I used LM26420-Q1 as dual step-down DC/DC converter with 1.8V & 3.3V output voltage. I have problem of efficiency (60%) with the outpout voltage 2 (1.8V) !!