White LED Step-Up Converter ? High efficiency: 85% ? Drives up to four LEDs from a 3.3V supply ? Drives up to ten LEDs from a 5V supply ? Fast 1.2MHz switching frequency ? Uses tiny 22μH inductors ? Requires only 0.22μF output capacitor ? Low profile SOT package ? Cellular phones ? PDAs, Handheld computers ? Digital cameras ? MP3 players ? GPS receivers