Data Sheet

LT8440

analog.com

Rev. 0

2 of 22

TABLE OF CONTENTS

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

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

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

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

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

Specifications........................................................................................................................................................................................3

Absolute Maximum Ratings ..................................................................................................................................................................5

Block Diagram.......................................................................................................................................................................................6

Pin Configurations and Function Descriptions ....................................................................................................................................7

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

Operation ............................................................................................................................................................................................11

Overview .........................................................................................................................................................................................11

Theory of Operation .......................................................................................................................................................................11

Applications Information....................................................................................................................................................................13

Input Frontend Design....................................................................................................................................................................13

Differential Choke...........................................................................................................................................................................14

Redundant Use of LT8440 ..............................................................................................................................................................15

VIN/LINEA/LINEB External Resistors................................................................................................................................................15

Loop Stability..................................................................................................................................................................................16

Current Limit Loop .....................................................................................................................................................................16

Current Shunt Loop....................................................................................................................................................................16

Short-Circuit Event .........................................................................................................................................................................17

Printed Circuit Board (PCB) Layout, Coating, and Thermal Considerations ................................................................................18

Typical Applications............................................................................................................................................................................19

Outline Dimensions.............................................................................................................................................................................20

Ordering Guide....................................................................................................................................................................................21

Related Parts.......................................................................................................................................................................................21

REVISION HISTORY

REVISION

NUMBER

REVISION

DATE

DESCRIPTION

DESCRIPTION

0

7/24

Initial release

—