ADP5020

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TABLE OF CONTENTS

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

 

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

 

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

 

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

 

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

 

Functional Block Diagram .............................................................. 3

 

Specifications..................................................................................... 4

 

Switching Specifications .............................................................. 5

 

DC-to-DC Conversion Specifications, Buck 1 Regulator....... 5

 

DC-to-DC Conversion Specifications, Buck 2 Regulator....... 6

 

VOUT3 Specifications, Low Dropout (LDO) Regulator ........ 6

 

I2C Timing Specifications............................................................ 7

 

Absolute Maximum Ratings............................................................ 8

 

Thermal Resistance ...................................................................... 8

 

ESD Caution.................................................................................. 8

 

Pin Configuration and Function Descriptions............................. 9

 

Typical Performance Characteristics ........................................... 10

 

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

 

Circuit Operation ....................................................................... 13

 

Internal Compensation.............................................................. 13

 

Current Limiting and Short-Circuit Protection..................... 13

 

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

 

I2C Interface ................................................................................ 13

 

Undervoltage Lockout ............................................................... 13

 

Thermal Shutdown .................................................................... 13

 

Control Registers ............................................................................ 14

 

Device Address ........................................................................... 14

 

Register Map ............................................................................... 14

 

Register Descriptions................................................................. 14

 

Power-Up/Power-Down Sequence............................................... 17

 

Sequencer .................................................................................... 17

 

Default Power-On Sequence with EN Pin .............................. 17

 

Power-On Sequence Using the I2C Interface.............................. 19

 

Power-Up/Power-Down State Flow......................................... 20

 

Applications Information .............................................................. 21

 

Power Good Status ..................................................................... 21

 

XSHTDN Logic .......................................................................... 21

 

Components Selection............................................................... 21

 

LDO Input Filter......................................................................... 22

 

Layout Recommendations............................................................. 23

 

Applications Schematic ............................................................. 23

 

PCB Board Layout Recommendations.................................... 24

 

External Component List .......................................................... 24

 

Outline Dimensions ....................................................................... 25

 

Ordering Guide .......................................................................... 25

 

REVISION HISTORY

4/09—Revision 0: Initial Version