ADP1655

Rev. 0 | Page 2 of 24

TABLE OF CONTENTS

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

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

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

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

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

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

Recommended Specifications: Input and Output Capacitance

and Inductance ............................................................................. 4

I2C-Compatible Interface Timing Specifications ..................... 5

Absolute Maximum Ratings............................................................ 6

Thermal Data ................................................................................ 6

Thermal Resistance ...................................................................... 6

ESD Caution.................................................................................. 6

Pin Configuration and Function Descriptions............................. 7

Typical Performance Characteristics ............................................. 8

Theory of Operation ...................................................................... 12

White LED Driver ...................................................................... 12

Assist Light and Torch Modes .................................................. 12

2-Bit Logic Interface Mode (I2C/EN = 0)............................... 13

I2C Interface Mode (I2C/EN = 1)............................................. 13

State Transitions ......................................................................... 15

I2C Register Map............................................................................. 16

Safety Features................................................................................. 19

Overvoltage Fault ....................................................................... 19

Output Capacitor Fault.............................................................. 19

Timeout Fault.............................................................................. 19

Overtemperature Fault .............................................................. 19

Short-Circuit Fault ..................................................................... 19

Current Limit .............................................................................. 19

Amount of LED Detection........................................................ 19

Input Undervoltage .................................................................... 19

Applications Information .............................................................. 20

External Component Selection ................................................ 20

PCB Layout...................................................................................... 22

Outline Dimensions ....................................................................... 23

Ordering Guide .......................................................................... 23

REVISION HISTORY

5/09—Revison 0: Initial Version