RT8549L Datasheet | Richtek

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. Features - Wide Operating Input Voltage : 4.2V to 24V - Max 60V Output Voltage - 3% LED Current Accuracy - 2% LED Current Matching - Low Drop Output 120m A/0.4V Current Sink - SMBus Programs LED Current, Switching Frequency, Dimming Mode - LED Current : 22.58m A to 180m A - Switching Frequency : 200k Hz to 900k Hz - 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 - Ro HS pliant and Halogen Free Applications - UMPC and Notebook puter Backlight Simplified Application Circuit CIN1 R1 Enable Pull Up SMBus Pull Up CIN2 RP1 RP2 PWM Signal RP CP L1 D1 FAULT VOUT RT8549L SMBCLK SMBDAT...