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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?