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LT8606(Buck Converter) efficiency improvement

My Customer are reviewing the LT8606 ( buck Converter )

They use Brust Mode, Because Output Current is 10uA

They hope to improve the efficiency

  - input : 10V ~ 15V

  - Output :3.3V / 10uA

  - Inductor : 6.8uH

in my opinion, at low load the switching frequency is lower than typical output current ( Brust Mode )

so, I think that if Inductor Value is higher than 6.8uH, efficiency is higher

anyway, I want to know another opinion!!

Pleaes Let me know~~ any opinion....  Thanks a lot