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LP8867Q1EVM: Lowest Vin when SW = 2.1MHz

Part Number: LP8867Q1EVM


I tried to use LP8867Q1EVM in 2.1MHz Fsw. But when Vin = 7V,(Vout=24V,Iout=0.4A) the IC will shut down. Is this make sense? How could we fix this issue?

We think the efficiency is bad so that cause Iin is large to detect the current limit.