RT8549L集成電路（IC）的LED驅(qū)動器規(guī)格書PDF中文資料

General Description

The RT8549L is a high efficiency Boost converter with

4-CH LED driver supporting 60V maximum output voltage.

It is designed for LCD panel applications that employs

LED as lighting sources. The Boost converter generates

a suitable output voltage to drive four LED strings in parallel

and supports up to 18 LEDs per string.

The RT8549L supports a wide input voltage range from

4.2V to 24V and provides a SMBus interface to control

the LED brightness dimming mode, operating frequency

and LED currents. The internal 150mΩ, 60V power switch

with current-mode control provides high efficiency

operation.

The RT8549L is available in the WDFN-16L 5x5 package

to achieve optimized solution for PCB space.

Applications

? UMPC and Notebook Computer Backlight

Features

? Wide Operating Input Voltage : 4.2V to 24V

? Max 60V Output Voltage

? 3 LED Current Accuracy

? 2 LED Current Matching

? Low Drop Output 120mA/0.4V Current Sink

? SMBus Programs LED Current, Switching

Frequency, Dimming Mode

? LED Current : 22.58mA to 180mA

? Switching Frequency : 200kHz to 900kHz

? Dimming Mode : PWM, DC, Mixed-Mode

? Built-in Input UVP, Output OVP, OCP, and Soft-Start

? Support LED Hot-plug, Open/Short Detection

? Low EMI, Low Acoustic Noise

? 16-Load WDFN Package

? RoHS Compliant and Halogen Free