Hi, msamera! Thank You for Your reply! It not exactly the inductor, just a small ferrite bead like BLM21 type. I think that this way I`ll get a better filtration than just using a simple RC filter.
About my problem - I find out the solution and it was very simple. A REFIN chip contact has a bad connection with PCB and DCDC wasn`t start up . Maybe it will be helpful for somebody.