Datasheet

ADP2441 Data Sheet
Rev. A | Page 2 of 32
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Typical Circuit Configuration ......................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Absolute Maximum Ratings ............................................................ 5
Thermal Resistance ...................................................................... 5
ESD Caution .................................................................................. 5
Pin Configuration and Function Descriptions ............................. 6
Typical Performance Characteristics ............................................. 7
Internal Block Diagram ................................................................. 14
Theory of Operation ...................................................................... 15
Control Architecure ................................................................... 15
Adjustable Frequency ................................................................. 16
Power Good ................................................................................. 16
Soft Start ...................................................................................... 16
Tracking ....................................................................................... 16
Undervoltage Lockout (UVLO) ............................................... 17
Precision Enable/Shutdown ...................................................... 17
Current-Limit and Short-Circuit Protection .......................... 17
Thermal Shutdown ..................................................................... 17
Applications Information .............................................................. 18
Selecting the Output Voltage .................................................... 18
Setting the Switching Frequency .............................................. 18
Soft Start ...................................................................................... 19
External Components Selection ............................................... 19
Boost Capacitor .......................................................................... 21
VCC Capacitor............................................................................ 21
Loop Compensation .................................................................. 21
Large Signal Analysis of the Loop Compensation ................. 21
Design Example .............................................................................. 23
Configuration and Components Selection ............................. 23
System Configuration ................................................................ 24
Typical Application Circuits ......................................................... 25
Design Example .......................................................................... 25
Other Typical Circuit Configurations ..................................... 26
Power Dissipation and Thermal Considerations ....................... 29
Power Dissipation....................................................................... 29
Thermal Considerations ............................................................ 29
Evaluation Board Thermal Performance .................................... 30
Circuit Board Layout Recommendations ................................... 31
Outline Dimensions ....................................................................... 32
Ordering Guide .......................................................................... 32
REVISION HISTORY
11/12—Rev. 0 to Rev. A
Changes to Figure 1 .......................................................................... 1
Changed I
VIN
Maximum Parameter from 2.2 mA to2 mA .......... 3
Changes to Pin 3 and Pin 5 Descriptions ...................................... 6
Changes to Boost Capacitor Section ............................................ 21
Changes to Figure 66 ...................................................................... 31
Changes to Ordering Guide .......................................................... 32
6/12—Revision 0: Initial Version