Datasheet

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
I
2
C-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