Data Sheet

LT8210-1

analog.com

Rev. A

3 of 59

TABLE OF CONTENTS

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

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

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

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

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

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

Absolute Maximum Ratings ....................................................................................................................................................................12

Thermal Resistance.............................................................................................................................................................................13

Pin Configurations and Function Descriptions......................................................................................................................................13

Block Diagram..........................................................................................................................................................................................17

Typical Performance Characteristics .....................................................................................................................................................18

Theory of Operation ................................................................................................................................................................................25

Overview ..............................................................................................................................................................................................25

Continuous Conduction Mode (CCM).................................................................................................................................................25

Discontinuous Conduction Mode (DCM)............................................................................................................................................25

Pass-Thru Mode...................................................................................................................................................................................26

Power Switch Control (CCM, DCM Operation)...................................................................................................................................26

Power Switch Control: Buck Region (VINP > 1.19 • VOUT)......................................................................................................................27

Power Switch Control: Boost Region (VINP < 0.84 • VOUT) ....................................................................................................................27

Power Switch Control: Buck-Boost Region (0.84 • VOUT < VINP < 1.19 • VOUT) ......................................................................................27

Power Switch Control (Pass-Thru Mode)...........................................................................................................................................29

Transitioning Between Operating Modes..........................................................................................................................................30

Enable and Start-Up............................................................................................................................................................................30

EXTVCC/GATEVCC/VDD Power Supplies ..................................................................................................................................................31

Reverse Input Protection....................................................................................................................................................................32

Multiphase Current Sharing ...............................................................................................................................................................33

Buck Foldback .....................................................................................................................................................................................34

PWGD Pin .............................................................................................................................................................................................34

Applications Information ........................................................................................................................................................................35

Maximum Output Current and RSENSE Selection.................................................................................................................................36

Inductor Selection...............................................................................................................................................................................37

Switching Frequency Selection..........................................................................................................................................................38

RT Set Switching Frequency...............................................................................................................................................................39