ADP2140

Data Sheet

Rev. B | Page 2 of 32

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications....................................................................................... 1

Typical Application Circuits............................................................ 1

General Description ......................................................................... 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

10/2019—Rev. A to Rev. B

Changes to Output Capacitor Section ......................................... 24

Updated Outline Dimensions ....................................................... 30

Changes to Ordering Guide .......................................................... 30

9/2012—Rev. 0 to Rev. A

Updated Outline Dimensions ....................................................... 30

Changes to Ordering Guide .......................................................... 30

6/2010—Revision 0: Initial Version