I have a problem with the LT8390, I use it as a solar charger with a lead acid battery 12V.
I use your application circuit showing a solar panel charger in datasheet page 32.
The layout is made as specified in datasheet.
The FB circuit is a little different with temperature compensating components. Vout 14.2V at 20⁰C.
I use 1V as control voltage for max 5A in., when the Vin voltage exceed 30V the output voltage and current drops to a lower value. Voltage 12.8V.
If I turn the control voltage to 0.4V @ Vin > 30V, the output voltage and current goes back to “normal”.
If the charge current is below 2.5A when the input voltage exceeds 30V, output voltage remains 14.2V.
Sorry, found the problem!
An additional 1µF capacitor placed immediately next to the INTVcc pin and power ground, as mention in the datasheet, did it.