ADP1649

Data Sheet

Rev. 0 | Page 2 of 28

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 ............................................................................. 5

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 ...................................................................... 11

White LED Driver ...................................................................... 11

Modes of Operation ................................................................... 11

Assist Light .................................................................................. 12

Flash Mode .................................................................................. 12

Assist to Flash Operation .......................................................... 12

Torch Mode ................................................................................. 12

Torch to Flash Mode .................................................................. 13

TxMASK Operation................................................................... 13

Frequency Foldback ................................................................... 13

Indicator LED Driver................................................................. 13

Low Battery LED Current Foldback........................................ 13

Programmable Battery DC Current Limit.............................. 14

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

5 V Output Operation ............................................................... 15

Safety Features................................................................................. 17

Short-Circuit Fault ..................................................................... 17

Overvoltage Fault ....................................................................... 17

Dynamic Overvoltage Mode (DOVP) .................................... 17

Timeout Fault.............................................................................. 17

Overtemperature Fault .............................................................. 17

Indicator LED Fault ................................................................... 17

Current Limit.............................................................................. 17

Input Undervoltage .................................................................... 17

Soft Start ...................................................................................... 17

Reset Using the Enable (EN) Pin ............................................. 17

Clearing Faults............................................................................ 17

I²C Interface ................................................................................ 18

I²C Register Map............................................................................. 19

Applications Information .............................................................. 25

External Component Selection ................................................ 25

PCB Layout...................................................................................... 27

Packaging and Ordering Information ......................................... 28

Outline Dimensions................................................................... 28

Ordering Guide .......................................................................... 28

REVISION HISTORY

7/12—Revision 0: Initial Version