LTC3589

2

3589p

TABLE OF CONTENTS

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

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

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

Description......................................................................................................................... 1

Absolute Maximum Ratings..................................................................................................... 3

Pin Configuration ................................................................................................................. 3

Order Information................................................................................................................. 3

Electrical Characteristics ........................................................................................................ 4

Typical Performance Characteristics .......................................................................................... 8

Pin Functions .....................................................................................................................12

Block Diagram....................................................................................................................14

Operation..........................................................................................................................15

Introduction .......................................................................................................................................................... 15

Always-On LDO..................................................................................................................................................... 16

250mA LDO Regulators ........................................................................................................................................ 16

Step-Down Switching Regulators ......................................................................................................................... 18

Buck-Boost Switching Regulator .......................................................................................................................... 22

Slewing DAC Reference Operation........................................................................................................................ 26

Pushbutton Operation........................................................................................................................................... 27

Enable and Power-On Sequencing ........................................................................................................................ 29

Fault Detection, Shutdown, and Reporting............................................................................................................ 30

Thermal Considerations and Board Layout ........................................................................................................... 38

Applications Information .......................................................................................................40

Typical Application ..............................................................................................................42

Package Description ............................................................................................................43

Typical Application ..............................................................................................................44

Related Parts .....................................................................................................................44