ADP1650

Rev. C | 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 ............................................................................. 5

 

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 ............................................................... 16

 

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

4/11—Rev. B to Rev. C

Added 10-Lead LFCSP Package........................................Universal

Changes to Features Section, General Description Section, and

Figure 2 Caption ............................................................................... 1

Changes to Table 1............................................................................ 3

Changes to Table 5............................................................................ 6

Added Figure 5; Renumbered Sequentially .................................. 7

Changes to Table 6............................................................................ 7

Changes to PCB Layout Section and Figure 45 Caption........... 28

Added Figure 46.............................................................................. 28

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

Changes to Ordering Guide .......................................................... 29

2/11—Rev. A to Rev. B

Changes to Features Section and General Description Section . 1

Changes to Switching Regulator, Voltage Output Mode, VOUT

Voltage Parameter and Digital Inputs/GPIO, Torch Glitch

Filtering Delay Parameter, Table 1.................................................. 3

Changed GND to Power Ground Throughout .............................6

Change to Figure 10 Caption ...........................................................8

Change to Figure 11 Caption ...........................................................9

Changed LED_MOD = 10 to LED_MOD = 11 in Figure 32 ... 14

Changes to Analog-to-Digital Converter Operation Section and

Figure 37 .......................................................................................... 15

Changes to Selecting the Output Capacitor Section.................. 26

6/10—Rev. 0 to Rev. A

Changes to Contact Information.....................................................1

5/10—Revision 0: Initial Version