Datasheet

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

I
2
C-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
I
2
C Interface ................................................................................ 19
I
2
C 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
Changed IL to I
L
, ILED to I
LED
, LED OUT to LED_OUT, and
IBAT to I
BAT
Throughout ..................................................................8
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