CATALYST SEMICONDUCTOR 3-Channel Ultra High Efficiency Quad-Mode LED Driver Manual说明书用户手册.PDF

CAT3643 3-Channel Ultra High Efficiency Quad-Mode® LED Driver FEATURES DESCRIPTION ® High efficiency 1.33x charge pump The CAT3643 is a high efficiency Quad-Mode Quad-mode charge pump: 1x, 1.33x, 1.5x, 2x fractional charge pump that can drive up to three LEDs programmable by a one wire digital interface. Drives up to 3 LEDs at 32mA each The inclusion of a 1.33x fractional charge pump mode 1-wire EZDim™ LED current programming increases device efficiency by up to 10% over Power efficiency up to 92% traditional 1.5x charge pumps with no added external capacitors. Low noise input ripple in all modes “Zero” current shutdown mode Low noise input ripple is achieved by operating at a Soft start and current limiting constant switching frequency which allows the use of small external ceramic capacitors. The multi-fractional Short circuit protection charge pump supports a wide range of input voltages Thermal shutdown protection from 2.4V to 5.5V. Tiny 12-pad XQFN, 12-pad TDFN and 16-pad