DESCRIPTION
   The CAT3644 is a high efficiency Quad-ModeTM fractional charge pump that can drive up to four LEDs programmable by a one wire digital interface. The inclusion of a 1.33x fractional charge pump mode increases device efficiency by up to 10% over traditional 1.5x charge pumps with no added external capacitors.

FEATURES
◾ High efficiency 1.33x charge pump
◾ Quad-mode charge pump: 1x, 1.33x, 1.5x, 2x
◾ Drives up to 4 LEDs at 25mA each
◾ 1-wire EZDim™ LED current programming
◾ Power efficiency up to 92%
◾ Low noise input ripple in all modes
◾ “Zero” current shutdown mode
◾ Soft start and current limiting
◾ Short circuit protection
◾ Thermal shutdown protection
◾ 3mm x 3mm, 16-pad TQFN package

APPLICATION
◾ LCD Display Backlight
◾ Cellular Phones
◾ Digital Still Cameras
◾ Handheld Devices