ADM8845 データシートの表示（PDF） - Analog Devices

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ADM8845

Charge Pump Driver for LCD White LED Backlights

Analog Devices 

ADM8845

TABLE OF CONTENTS

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

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

Thermal Characteristics .............................................................. 4

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

Pin Configuration and Function Description ...............................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

LED Brightness Control Using a PWM Signal Applied to

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

REVISION HISTORY

10/04—Revision 0: Initial Version

LED Brightness Control Using a DC Voltage Applied to

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

Applications......................................................................................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

Rev. 0 | Page 2 of 20

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