ADP1650

Rev. 0 | Page 2 of 32

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 Configurations and Function Descriptions ........................... 7

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

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

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

Modes of Operation ................................................................... 12

Assist Light .................................................................................. 13

Flash Mode .................................................................................. 13

Assist to Flash Operation .......................................................... 13

Torch Mode ................................................................................. 13

Torch-to-Flash Mode ................................................................. 14

TxMASK Operation................................................................... 14

Frequency Foldback ................................................................... 14

Indicator LED Driver................................................................. 14

Low Battery LED Current Foldback ........................................ 14

Programmable Battery DC Current Limit.............................. 15

Analog-to-Digital Converter Operation................................. 15

5 V Output Operation ............................................................... 17

Safety Features................................................................................. 18

Short-Circuit Fault ..................................................................... 18

Overvoltage Fault ....................................................................... 18

Dynamic Overvoltage Mode (DOVP)..................................... 18

Timeout Fault.............................................................................. 18

Overtemperature Fault .............................................................. 18

Indicator LED Fault ................................................................... 18

Current Limit.............................................................................. 18

Input Undervoltage .................................................................... 18

Soft Start ...................................................................................... 18

Reset Using the Enable (EN) Pin ............................................. 18

Clearing Faults............................................................................ 18

I2C Interface ................................................................................ 19

I2C Register Map............................................................................. 20

Applications Information .............................................................. 26

External Component Selection ................................................ 26

PCB Layout...................................................................................... 28

Outline Dimensions....................................................................... 29

Ordering Guide .......................................................................... 29

REVISION HISTORY

4/10—Revision 0: Initial Version