SC4539(2007) 数据手册 ( 数据表 ) - Semtech Corporation

Description
The SC4539 is designed to regulate current for a series chain of white LEDs in LCD backlighting applications where small size and high efficiency are priorities. This device integrates an 800kHz current-mode PWM boost converter and a 30mA programmable low dropout current sink regulator.

FEATUREs
■ Input voltage range — 2.8V to 5.5V
■ Current-mode PWM control — 800kHz
■ Programmable LED current up to 30mA
■ Soft-start to reduce in-rush current
■ PWM dimming — 100Hz to 50kHz
■ PWM dimming at ISET — Analog and filtered
■ Over-voltage protection — 25V (max.)
■ Under-voltage lockout (UVLO)
■ Thermal shutdown
■ Shutdown current — <1μA
■ Ultra-thin package — 2mm x 2mm x 0.6mm
■ Lead-free package, WEEE and RoHS compliant

APPLICATIONs
■ White LED Display Backlight Driver
■ Smartphones and PDAs
■ Cellular Handsets
■ MP3 and Portable Media Players
■ DSC, GPS, Satellite Radio, Game Players