ADM8845(RevD) Ver la hoja de datos (PDF) - Analog Devices

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ADM8845
(Rev.:RevD)

Charge Pump Driver for LCD White LED Backlights

Analog Devices 

ADM8845

TABLE OF CONTENTS

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

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

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

Functional Block Diagram .............................................................. 1

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

Specifications..................................................................................... 3

Absolute Maximum Ratings............................................................ 4

Thermal Resistance ...................................................................... 4

ESD Caution.................................................................................. 4

Pin Configuration and Function Descriptions............................. 5

Typical Performance Characteristics ............................................. 6

Theory of Operation ...................................................................... 10

Output Current Capability ........................................................ 11

Automatic Gain Control............................................................ 11

Current Matching ....................................................................... 11

Brightness Control with a Digital PWM Signal ..................... 11

REVISION HISTORY

5/2018—Rev. C to Rev. D

Changes to Features Section............................................................ 1

Add Thermal Resistance Section.................................................... 4

Changes to Figure 2 .......................................................................... 5

Updated Outline Dimensions ....................................................... 18

Changes to Ordering Guide .......................................................... 18

1/2011—Rev. B to Rev. C

Changes to Figure 18 and Figure 19............................................... 8

Changes to Ordering Guide .......................................................... 18

4/2010—Rev. A to Rev. B

Changes to Figure 2 .......................................................................... 5

Changes to Figure 4 .......................................................................... 6

Data Sheet

LED Brightness Control Using a PWM Signal Applied to

VPWM ............................................................................................. 13

LED Brightness Control Using a DC Voltage Applied to

VBRIGHT .......................................................................................... 13

Applications Information .............................................................. 14

Layout Considerations and Noise ............................................ 14

White LED Shorting .................................................................. 14

Driving Fewer than Six LEDs ................................................... 14

Driving Flash LEDs.................................................................... 15

Driving Camera Light, Main, and Sub LEDs.......................... 15

Driving Four Backlight White LEDs and Flash LEDs........... 16

Power Efficiency ......................................................................... 17

Outline Dimensions ....................................................................... 18

Ordering Guide .......................................................................... 18

Changes to Figure 16 to Figure 19...................................................8

Changes to Brightness Control with a Digital PWM Signal

Section.............................................................................................. 11

Added Exposed Pad Notation to Outline Dimensions ............. 18

Changes to Ordering Guide .......................................................... 18

7/2005—Rev. 0 to Rev. A

Changes to Table 3.............................................................................5

Changes to Table 7.......................................................................... 12

Updated Outline Dimensions ....................................................... 18

Changes to Ordering Guide .......................................................... 18

10/2004—Revision 0: Initial Version

Rev. D | Page 2 of 18

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