I confirmed that there was a short between INTVCC and BST of LT8620. Therefore, I think the internal diode may be broken.
If you have any experience with this cause, please let me know.
Thanks for the information. One possible cause may be the overvoltage on the BST pin. Another thing to check is the BST cap on the pin. A local 0.1uF cap is recommended to be close to the IC.
My pleasure to help. It depends on the application. LT8620 and LT8645S have very similar voltage range. LT8645S has higher current rating. The LT8645S belongs to the silent switcher product family with extremely…