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.

应用

UMPC and Notebook Computer Backlight

关键特性

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