ADP2105/ADP2106/ADP2107

Rev. 0 | Page 2 of 32

TABLE OF CONTENTS

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

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

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

Typical Performance Characteristics ............................................. 1

Typical Operating Circuit................................................................ 1

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

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

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

Thermal Resistance ...................................................................... 5

Boundary Condition .................................................................... 5

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

Pin Configuration and Function Descriptions............................. 6

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

Theory of Operation ...................................................................... 12

Control Scheme .......................................................................... 12

PWM Mode Operation.............................................................. 12

PFM Mode Operation................................................................ 12

Pulse-Skipping Threshold ......................................................... 12

100% Duty Cycle Operation (LDO Mode) ............................. 12

Slope Compensation .................................................................. 13

Features ........................................................................................ 13

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

External Component Selection................................................. 15

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

Inductor Selection ...................................................................... 16

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

Input Capacitor Selection.......................................................... 17

Input Filter................................................................................... 18

Soft Start ...................................................................................... 18

Loop Compensation .................................................................. 18

Bode Plots.................................................................................... 19

Load Transient Response .......................................................... 20

Efficiency Considerations ......................................................... 21

Thermal Considerations............................................................ 21

Design Example.......................................................................... 22

External Component Recommendations.................................... 24

Circuit Board Layout Recommendations ................................... 26

Evaluation Board ............................................................................ 27

Evaluation Board Schematic (ADP2107-1.8V)...................... 27

Recommended PCB Board Layout

(Evaluation Board Layout)........................................................ 27

Application Circuits ....................................................................... 29

Outline Dimensions ....................................................................... 31

Ordering Guide .......................................................................... 31

REVISION HISTORY

7/06—Revision 0: Initial Version