描述 Description

The SC657 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 — 0mA to 25mA
·Up to three LED grouping options
·Fade-in/fade-out feature for main LED bank
·Charge pump frequency — 250kHz
·SemPulse single wire interface
·Backlight current accuracy — ±1.5% typical
·Backlight current matching — ±0.5% typical
·LED float detection
·Automatic sleep mode (LEDs off) — IQ = 60μA (typ.)
·Shutdown current — 0.1μA (typical)
·Ultra-thin package — 2 x 2 x 0.6 (mm)
·Fully WEEE and RoHS compliant

應(yīng)用 Application

·Cellular phones, smart phones, and PDAs
·LCD modules
·Portable media players
·Digital cameras
·Personal navigation devices
·Display/keypad backlighting and LED indicators

簡介

SC657屬于集成電路（IC）的LED驅(qū)動器。由制造生產(chǎn)的SC657LED 驅(qū)動器器件屬于 LED 驅(qū)動器電源管理集成電路 (PMIC) 系列，可通過標(biāo)稱固定電壓的電源為負(fù)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(diào)節(jié)的類似產(chǎn)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?？蓪ζ骷ぷ鼽c(diǎn)進(jìn)行外部控制，可在照明應(yīng)用中用于實(shí)現(xiàn)調(diào)光功能。