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RT8549L Datasheet(PDF) 1 Page - Richtek Technology Corporation |
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RT8549L Datasheet(HTML) 1 Page - Richtek Technology Corporation |
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1 / 24 page  RT8549L ® DS8549L-00 May 2019 www.richtek.com 1 © Copyright 2019 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. 24V/60V Boost Converter with SMBus Controlled 4-CH LED Driver 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 150m Ω, 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 Simplified Application Circuit Pull Up Pull Up RP1 RP2 CS1 CS2 CS3 VDC VOUT VIN VOUT(MAX) VIN CS4 COMP CIN1 L1 D1 RT8549L : : : : : : : : : : : : COUT LX RCOMP CCOMP GND SMBCLK EN PGND CIN2 R1 CDC PWM SMBDAT PWM Signal SMBus ILED FAULT Enable |
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