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LT8357 Sepic


I want to develop a power supply circuit using the LT8357.
The output voltage is 5Vdc with a maximum output current of 2.5A.
The input voltage is always above 8V but during start-up it could drop to 3V for about 20msec. 

So I was thinking of using the LT8357 in sepic configuration even if 99% of the time it will always work in buck mode.
Is there an excel to perform all the necessary calculations?



  • FormerMember
    0 FormerMember
on Mar 29, 2022 8:17 PM

Hi Robert,

There is no excel file for the necessary calculations as of yet. You can refer to the datasheet for the design application starting on page 23.



  • Hi Jhun

    I saw that I could use the LTpowercad tool to calculate the circuit.
    Unfortunately, it only allows me to use it for "SEPIC not L-Couperd".
    If I select "SEPIC Couped L" I get this error.

    is there a solution?

    I have already tried to update with SYNC/RELEASE.


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