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RT8511B Datasheet(PDF) 1 Page - Richtek Technology Corporation

Part # RT8511B
Description  43V Asynchronous Boost WLED Driver
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT8511B Datasheet(HTML) 1 Page - Richtek Technology Corporation

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RT8511B
®
DS8511B-05
February 2015
www.richtek.com
1
©
Copyright
2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
Ordering Information
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.
Marking Information
Pin Configurations
(TOP VIEW)
WDFN-8L 2x2
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.
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
OVP
FB
GND
EN
PWM
VIN
LX
DIMC
7
6
5
1
2
3
4
8
9
0F : Product Code
W : Date Code
0FW
Package Type
QW : WDFN-8L 2x2 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
RT8511B


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