Can I power MP2338 device with a solar panel?
If yes how to connect it?
Yes, the MP2338 can be powered by a solar panel, but you’ll need a proper DC output from the panel along with a stable power path—usually done by adding a solar charge controller or a regulated DC source between the panel and the MP2338 to ensure voltage stays within its safe limits.
If you mean the stepdown converter, then not directly.
Solar panels are best regarded as current sources, not voltage sources, and a single cloud can cause the current to drop to a level where the converter will malfunction.
Use solar panels to charge batteries, and use the batteries as the power source for the MP2338.
In general, you don't use a solar panel to power anything directly, you use the solar panel with appropriate hardware to charge a battery and the battery with appropriate hardware powers your MP2338
What do you want to power with that buck converter.
Can't you use a panel with the correct voltage'so you won't need to convert.
Leo..