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Analog Devices Semiconductor Electronic Components Datasheet

ADD5205 Datasheet

Four-String White LED Driver

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Data Sheet
FEATURES
White LED driver based on inductive boost converter
Input voltage range: 2.8 V to 18 V
Internal compensation
1 MHz fixed operating frequency
28 V fixed overvoltage protection
Built-in soft start for boost converter
Drives up to 4 LED current sources
LED current adjustable up to 25 mA for each channel
DC current level brightness control with PWM input
LED open fault protection
General
Thermal shutdown
Undervoltage lockout
12-lead, 3 mm × 3 mm × 0.75 mm LFCSP package
APPLICATIONS
Smart PCs, PMPs, tablet PCs, UMPCs, and notebooks
GENERAL DESCRIPTION
The ADD5205 is a white LED driver for backlight applications
based on high efficiency, current mode, step-up converter
technology. It is designed with a 0.3 Ω internal switch and 1 MHz
fixed operating frequency. The ADD5205 contains four regulated
constant current sources for uniform brightness intensity. Each
current source is capable of driving up to 25 mA.
The ADD5205 has four parallel strings of multiple series connected
LEDs with ±2% current matching. The device provides adjustable
current sources that drive up to 25 mA using an external resistor.
The LED current can be controlled by a PWM signal input on
the PWM pin. An internal circuit translates the PWM signal to
an analog signal with an external capacitor and linearly controls
the LED current.
Four-String White LED Driver
ADD5205
FUNCTIONAL BLOCK DIAGRAM
STEP-UP SWITCHING REGULATOR
4-CHANNEL CURRENT SOURCES
BRIGHTNESS CONTROL LOGIC
UNDERVOLTAGE LOCKOUT
SOFT START
THERMAL PROTECTION
OVERVOLTAGE PROTECTION
AUTODISABLE FOR LED OPEN
Figure 1.
The ADD5205 has multiple safety protection features to prevent
any damage during fault conditions. If one or more LEDs are open,
the device disables the faulty current regulator automatically.
The internal soft start prevents inrush current during startup. A
thermal shutdown protection feature prevents thermal damage.
The ADD5205 is available in a low profile, thermally enhanced
3 mm × 3 mm × 0.75 mm, 12-lead lead frame chip scale package
(LFCSP) and is specified over the temperature range of −25°C
to +85°C.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2011 Analog Devices, Inc. All rights reserved.
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Analog Devices Semiconductor Electronic Components Datasheet

ADD5205 Datasheet

Four-String White LED Driver

No Preview Available !

www.DataSheet.co.kr
ADD5205
TABLE OF CONTENTS
Features .............................................................................................. 1 
Applications....................................................................................... 1 
Functional Block Diagram .............................................................. 1 
General Description ......................................................................... 1 
Revision History ............................................................................... 2 
Functional Block Diagram .............................................................. 3 
Specifications..................................................................................... 4 
Absolute Maximum Ratings............................................................ 6 
Thermal Resistance ...................................................................... 6 
ESD Caution.................................................................................. 6 
Pin Configuration and Function Descriptions............................. 7 
REVISION HISTORY
8/11—Revision 0: Initial Version
Data Sheet
Typical Performance Characteristics ..............................................8 
Theory of Operation ...................................................................... 10 
Current Mode, Stepup Switching Regulator Operation........ 10 
Current Source............................................................................ 10 
PWM Dimming Mode .............................................................. 10 
Safety Features ............................................................................ 10 
External Component Selection Guide..................................... 11 
Layout Guidelines....................................................................... 12 
Typical Application Circuit ........................................................... 13 
Outline Dimensions ....................................................................... 14 
Ordering Guide .......................................................................... 14 
Rev. 0 | Page 2 of 16
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Part Number ADD5205
Description Four-String White LED Driver
Maker Analog Devices
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ADD5205 Datasheet PDF






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