BST31PGND32SW33PVIN34EN55FB56VOUT57PVIN58PVIN49SW410PGND411BST412GND13EN414COMP415FB416GND17GND18GND19PWRGD20FB221COMP222EN223PVIN224PVIN225SW226SW227BST228DL229PGND30DL131BST132SW133SW134PVIN135PVIN136EN137SS1238COMP139FB140RT41VDD42SYNC/MODE43VREG44FB345COMP346SS3447EN348EP49