描述 Description

The SC643 is a high efficiency charge pump LED driver using Semtech’s proprietary charge pump technology. Performance is optimized for use in single cell Li-ion battery applications.

特性 Features

·Input supply voltage range — 2.9V to 5.5V
·Very high efficiency charge pump driver system with three modes — 1x, 1.5x, and 2x
·Five programmable current sinks with 29 increments from 0mA to 25mA
·One programmable 100mA low-noise LDO regulator
·Three programmable 150mA low-noise LDO regulators
·Programmable driver configurations for main and sub-display backlight
·Fade-in/fade-out feature for main and sub display backlight
·SemPulse single wire interface
·Backlight current accuracy — ±1.5% typical
·Backlight current matching — ±0.5% typical
·External enable pin for optional control of LDO4
·Automatic sleep mode with LEDs off
·Shutdown current — 0.1μA typical
·Ultra-thin package — 3 x 3 x 0.6 (mm)
·Fully WEEE and RoHS compliant

應用 Application

·Cellular phones, smart phones, and PDAs
·LCD display modules
·Portable media players
·Digital cameras and GPS units
·Display backlighting and LED indicators

簡介

SC643屬于集成電路（IC）的LED驅動器。由制造生產的SC643LED 驅動器器件屬于 LED 驅動器電源管理集成電路 (PMIC) 系列，可通過標稱固定電壓的電源為負載（通常為發(fā)光二極管）提供電流，并且電流可控。它與用于電壓調節(jié)的類似產品的主要區(qū)別在于，這類器件提供較低的反饋電壓（以提高系統(tǒng)能效），而且通常可對器件工作點進行外部控制，可在照明應用中用于實現(xiàn)調光功能。