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LT8641 FB voltage higher than 0.81V

Category: Hardware
Product Number: LT8641IUDC#PBF


I'm using the LT8641 to step down from 5V to 1.2V. 

My top feedback resistor is 392K, 0.1% and bottom feedback resistor is 806K, 0.1%. I am seeing 1.29V at the input and Vfb is 0.871V, as opposed to 0.81V. This is at no load. 

What could cause this to happen? 

Thank you

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  • FormerMember
    0 FormerMember
in reply to AnthonyT0417

Bypass caps are used to minimize the loop to reduce the noise. If the noise is severe enough, it might damage the part or make it not work properly or both. I highly suggest following the datasheet recommendations and guidelines.