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