ADP2140
Data Sheet
 
Rev. A | Page 2 of 32
TABLE OF CONTENTS
Features .............................................................................................. 1 
Applications ....................................................................................... 1 
General Description ......................................................................... 1 
Typical Application Circuits ............................................................ 1 
Revision History ............................................................................... 2 
Specifications ..................................................................................... 3 
Recommended Specifications: Capacitors and Inductor ........ 4 
Absolute Maximum Ratings ............................................................ 5 
Thermal Data ................................................................................ 5 
Thermal Resistance ...................................................................... 5 
ESD Caution .................................................................................. 5 
Pin Configuration and Function Descriptions ............................. 6 
Typical Performance Characteristics ............................................. 7 
Buck Output .................................................................................. 7 
LDO Output ................................................................................ 14 
Theory of Operation ...................................................................... 19 
Buck Section ................................................................................ 19 
Control Scheme .......................................................................... 19 
PWM Operation ......................................................................... 19 
PSM Operation ........................................................................... 19 
Pulse Skipping Threshold .......................................................... 19 
Selected Features ............................................................................. 20 
Short-Circuit Protection............................................................ 20 
Undervoltage Lockout ............................................................... 20 
Thermal Protection .................................................................... 20 
Soft Start ...................................................................................... 20 
Current Limit .............................................................................. 20 
Power-Good Pin ......................................................................... 20 
LDO Section................................................................................ 20 
Applications Information .............................................................. 21 
Power Sequencing ...................................................................... 21 
Power-Good Function ............................................................... 24 
External Component Selection ................................................ 24 
Selecting the Inductor ................................................................ 24 
Output Capacitor ........................................................................ 24 
Input Capacitor ........................................................................... 24 
Efficiency ..................................................................................... 25 
Recommended Buck External Components .......................... 25 
LDO Capacitor Selection .......................................................... 26 
LDO as a Postregulator to Reduce Buck Output Noise ........ 26 
Thermal Considerations ................................................................ 28 
PCB Layout Considerations ...................................................... 29 
Outline Dimensions ....................................................................... 30 
Ordering Guide .......................................................................... 30 
 
REVISION HISTORY
9/12Rev. 0 to Rev. A
Updated Outline Dimensions ....................................................... 30
Changes to Ordering Guide .......................................................... 30
6/10Revision 0: Initial Version
 
 
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