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ADD5207

Four-String, White LED Driver for LCD Backlight Applications

Analog Devices 

ADD5207

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications....................................................................................... 1

General Description ......................................................................... 1

Typical Application Circuit ............................................................. 1

Revision History ............................................................................... 2

Functional Block Diagram .............................................................. 3

Specifications..................................................................................... 4

Step-Up Switching Regulator Specifications............................. 4

LED Current Regulation Specifications .................................... 5

General Specifications ................................................................. 6

Absolute Maximum Ratings............................................................ 7

Thermal Resistance ...................................................................... 7

ESD Caution.................................................................................. 7

Pin Configuration and Function Descriptions............................. 8

REVISION HISTORY

2/12—Rev. Sp0 to Rev. A

Replaced Block Diagram with Typical Application Circuit........ 1

Changes to Features Section and General Description Section . 1

Changes to Current Mode, Step-Up Switching Regulator

Operation Section, Boost Converter Switching Frequency

Section, PWM Dimming Mode Section, Phase Shift PWM

Dimming Section, and Safety Features Section.......................... 11

Data Sheet

Typical Performance Characteristics ..............................................9

Theory of Operation ...................................................................... 11

Current Mode, Step-Up Switching Regulator Operation ..... 11

Internal 3.3 V Regulator ............................................................ 11

Boost Converter Switching Frequency.................................... 11

Dimming Frequency (fPWM) ...................................................... 11

Current Source............................................................................ 11

PWM Dimming Mode .............................................................. 11

Safety Features ............................................................................ 11

External Component Selection Guide..................................... 12

Layout Guidelines....................................................................... 13

Typical Application Circuits ......................................................... 15

Outline Dimensions ....................................................................... 16

Ordering Guide .......................................................................... 16

Changes to Overvoltage Protection (OVP) Section .................. 11

Changes to Open-Loop Protection (OLP) Section,

Undervoltage Lockout (UVLO) Section, and Thermal

Protection Section .......................................................................... 12

Changes to Layout Guidelines Section ........................................ 13

7/09—Revision Sp0: Initial Version

Rev. A | Page 2 of 16

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