NEW YORK - Donor countries have pledged US$11.7 billion (S$15.4 billion) over three years to a global fund meant to combat AIDS and other deadly diseases, UN chief Ban Ki-moon said Tuesday.

Earlier, Washington said it was contributing what it said was a record US$4 billion dollars to the fund.

The announcement was made in New York as more than 40 donor countries, private foundations, and corporations met to replenish the resources of the Global Fund to Fight AIDS, Tuberculosis and Malaria for 2011 through 2013.

"At a time when so many governments are tightening their belts at home, these commitments send a powerful message. It shows how seriously world leaders want to do the right thing beyond their borders," Ban said.

"However, the demand for funding is likely to outstrip even the impressive commitments today. That means we must continue to mobilize more resources."