SAN FRANCISCO - (AP) - Steve Jobs, the mind behind the iPhone,iPad and other devices that turned Apple Inc. into one of theworld's most powerful companies, resigned as the company's CEOWednesday, saying he can no longer handle the job.

The move appears to be the result of an unspecified medicalcondition for which he took an indefinite leave from his post inJanuary. Apple's chief operating officer, Tim Cook, has been namedCEO.

In a letter addressed to Apple's board and the "Applecommunity," Jobs said he "always said if there ever came a daywhen I could no longer meet my duties and expectations as Apple'sCEO, I would be the first to let you know. Unfortunately, that dayhas come."

Apple said Jobs was elected board chairman and Cook is becominga member of its board.

The company said Jobs gave the board his resignation Wednesdayand suggested Cook be named the company's new leader.

The January leave was Jobs' third medical leave over severalyears. He had previously survived pancreatic cancer and received aliver transplant.