RT8511B Datasheet, PDF (1/11 Pages) Richtek Technology Corporation – 43V Asynchronous Boost WLED Driver

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RT8511B
43V Asynchronous Boost WLED Driver
General Description
The RT8511B is an LED driver IC that can support up to
10 WLED in series. It is composed of a current mode
boost converter integrated with a 43V/2.2A power switch
running at a fixed 500kHz frequency and covering a wide
VIN range from 2.7V to 24V.
The white LED current is set with an external resistor, and
the feedback voltage is regulated to 200mV (typ.). During
operation, the LED current can be controlled by the PWM
input signal in which the duty cycle determines the
feedback reference voltage.
For brightness dimming, the RT8511B is able to maintain
steady control of the LED current. Therefore, no audible
noises are generated on the output capacitor. The RT8511B
also has programmable over voltage pin to prevent the
output from exceeding absolute maximum ratings during
open LED conditions. The RT8511B is available in
WDFN-8L 2x2 package.
Ordering Information
RT8511B
Package Type
QW : WDFN-8L 2x2 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
Richtek products are :
 RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
 Suitable for use in SnPb or Pb-free soldering processes.
Features
 Wide Input Voltage Range : 2.7V to 24V
 High Output Voltage : up to 43V
 Direct PWM Dimming Control and Frequency from
100Hz to 8kHz
 Internal Soft-Start and Compensation
 200mV Reference Voltage
 PWM Dimming with Internal Filter
 Programmable Over Voltage Protection
 Over Temperature Protection
 Current Limit Protection
 Thin 8-Lead WDFN Package
 RoHS Compliant and Halogen Free
Applications
 UMPC and Notebook Computer Backlight
 GPS, Portable DVD Backlight
Pin Configurations
(TOP VIEW)
OVP 1
FB 2
DIMC 3
GND ⁴
8 _EN
7 PWM
6 VIN
9 5 LX
WDFN-8L 2x2
Marking Information
0F : Product Code
0FW
W : Date Code
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS8511B-05 February 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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