LTC3589/LTC3589-1/

LTC3589-2

2

3589fe

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 .......................................................................................... 9

Pin Functions .....................................................................................................................13

Block Diagram....................................................................................................................15

Operation..........................................................................................................................16

Introduction .......................................................................................................................................................... 16

LTC3589, LTC3589-1, and LTC3589-2 Functional Comparison ............................................................................. 17

Always-On LDO..................................................................................................................................................... 17

Step-Down Switching Regulators ......................................................................................................................... 20

Buck-Boost Switching Regulator .......................................................................................................................... 24

Slewing DAC Reference Operation........................................................................................................................ 28

Pushbutton Operation........................................................................................................................................... 29

Enable and Power-On Sequencing ........................................................................................................................ 31

Fault Detection, Shutdown, and Reporting............................................................................................................ 32

Thermal Considerations and Board Layout ........................................................................................................... 42

Typical Application ..............................................................................................................46

Package Description ............................................................................................................48

Revision History .................................................................................................................49

Typical Application ..............................................................................................................50

Related Parts .....................................................................................................................50