ADP2105 데이터 시트보기 (PDF) - Analog Devices

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ADP2105

1 A/1.5 A/2 A Synchronous, Step-Down DC-to-DC Converters

Analog Devices 

ADP2105/ADP2106/ADP2107

TABLE OF CONTENTS

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

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

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

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

Revision History ............................................................................... 3

Functional Block Diagram .............................................................. 4

Specifications..................................................................................... 5

Absolute Maximum Ratings............................................................ 7

Thermal Resistance ...................................................................... 7

Boundary Condition .................................................................... 7

ESD Caution.................................................................................. 7

Pin Configuration and Function Descriptions............................. 8

Typical Performance Characteristics ............................................. 9

Theory of Operation ...................................................................... 15

Control Scheme .......................................................................... 15

PWM Mode Operation.............................................................. 15

PFM Mode Operation................................................................ 15

Pulse-Skipping Threshold ......................................................... 15

100% Duty Cycle Operation (LDO Mode) ............................. 15

Slope Compensation .................................................................. 16

Design Features........................................................................... 16

Applications Information .............................................................. 17

Data Sheet

External Component Selection ................................................ 17

Setting the Output Voltage........................................................ 17

Inductor Selection ...................................................................... 18

Output Capacitor Selection....................................................... 19

Input Capacitor Selection.......................................................... 20

Input Filter................................................................................... 20

Soft Start Period.......................................................................... 20

Loop Compensation .................................................................. 20

Bode Plots.................................................................................... 21

Load Transient Response .......................................................... 22

Efficiency Considerations ......................................................... 24

Thermal Considerations............................................................ 24

Design Example .............................................................................. 26

External Component Recommendations.................................... 27

Circuit Board Layout Recommendations ................................... 29

Evaluation Board ............................................................................ 30

Evaluation Board Schematic for ADP2107 (1.8 V) ............... 30

Recommended PCB Board Layout (Evaluation Board

Layout) ......................................................................................... 30

Application Circuits ....................................................................... 32

Outline Dimensions ....................................................................... 34

Ordering Guide .......................................................................... 34

Rev. E | Page 2 of 36

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