NC1PGND2NC3SW4PGND5PGND6PGND7PGND8SW9SW10SW11SW12PVIN13PVIN14PVIN15PVIN16PVIN17PVIN18PVIN19BST20PGND21CS22FS23EN24FB25SGND26VDD27PVDD28PGND29PVIN31SW30