ADP2381

Data Sheet

Rev. 0 | Page 2 of 28

TABLE OF CONTENTS

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

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

Typical Applications Circuit............................................................ 1

General Description ......................................................................... 1

Revision History ............................................................................... 2

Specifications..................................................................................... 3

Absolute Maximum Ratings............................................................ 5

Thermal Information................................................................... 5

ESD Caution.................................................................................. 5

Pin Configuration and Function Description .............................. 6

Typical Performance Characteristics ............................................. 7

Functional Block Diagram ............................................................ 12

Theory of Operation ...................................................................... 13

Control Scheme .......................................................................... 13

Internal Regulator (VREG)....................................................... 13

Bootstrap Circuitry .................................................................... 13

Low-Side Driver.......................................................................... 13

Oscillator ..................................................................................... 13

Synchronization.......................................................................... 13

Enable and Soft Start.................................................................. 13

Power Good................................................................................. 14

Peak Current Limit and Short-Circuit Protection ................. 14

Overvoltage Protection (OVP) ................................................. 14

Undervoltage Lockout (UVLO)................................................ 14

Thermal Shutdown..................................................................... 14

Applications Information .............................................................. 15

Input Capacitor Selection.......................................................... 15

Output Voltage Setting .............................................................. 15

Voltage Conversion Limitations............................................... 15

Inductor Selection ...................................................................... 15

Output Capacitor Selection....................................................... 17

Low-Side Power Device Selection............................................ 17

Programming Input Voltage UVLO ........................................ 18

Compensation Design ............................................................... 18

ADIsimPower Design Tool ....................................................... 19

Design Example .............................................................................. 20

Output Voltage Setting .............................................................. 20

Frequency Setting....................................................................... 20

Inductor Selection ...................................................................... 20

Output Capacitor Selection....................................................... 20

Low-Side MOSFET Selection ................................................... 21

Compensation Components..................................................... 21

Soft Start Time Program ........................................................... 21

Input Capacitor Selection.......................................................... 21

Schematic for Design Example................................................. 21

External Components Recommendation.................................... 23

Circuit Board Layout Recommendations ................................... 25

Typical Application Circuits ......................................................... 27

Outline Dimensions....................................................................... 28

Ordering Guide .......................................................................... 28

REVISION HISTORY

3/12—Revision 0: Initial Version