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RT8549L

24V/60V Boost Converter with SMBus Controlled 4-CHLED Driver

RT8549L
New

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.

應用

  • UMPC and Notebook Computer Backlight

主要規格

RT8549L
Status Active
Vin (min) (V) 4.2
Vin (max) (V) 24
SW Freq (typ) (kHz) 400
Number of LEDs (max) (pcs) 15
Iout (max)/channel (mA) 180
Iq (typ) (mA) 3.3
Dimming Control Analog;PWM
Topology Boost + Current Source
Features Adjustable Frequency;Current Mode Control;Cycle-by-Cycle Current Limit;Enable Input;OVP;SCP
Package Type WDFN5x5-16

關鍵特性

  • 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

Datasheet

DS8549L-00.pdf

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