Data Sheet

LT8342

analog.com

Rev. 0

2 of 36

TABLE OF CONTENTS

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

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

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

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

Revision History ....................................................................................................................................................................................3

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

Absolute Maximum Ratings ..................................................................................................................................................................7

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

Electrostatic Discharge (ESD)...........................................................................................................................................................8

ESD Ratings.......................................................................................................................................................................................8

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

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

Typical Performance Characteristics .................................................................................................................................................12

Block Diagram.....................................................................................................................................................................................19

Theory of Operation............................................................................................................................................................................20

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

Programming VIN Turn-On and Turn-Off Thresholds with the EN/UVLO Pin.................................................................................21

INTVCC Regulator .............................................................................................................................................................................21

Programming the Output Voltage..................................................................................................................................................21

Light Load Current Operation — Burst Mode or Pulse-Skipping Mode.........................................................................................22

Programming Switching Frequency and Synchronization ...........................................................................................................22

Spread Spectrum Frequency Modulation......................................................................................................................................23

VIN to VOUT PassThru Mode Operation..............................................................................................................................................23

Switching Frequency Foldback when VIN Approaches VOUT............................................................................................................24

Output Short-Circuit Protection.....................................................................................................................................................24

Start-Up...........................................................................................................................................................................................25

Loop Compensation .......................................................................................................................................................................25

Thermal Considerations.................................................................................................................................................................25

Thermal Lockout ............................................................................................................................................................................26

Inductor Selection ..........................................................................................................................................................................26

Input Capacitor Selection...............................................................................................................................................................26

Output Capacitor Selection............................................................................................................................................................27

Recommended PCB Layout Guidelines .........................................................................................................................................27

Typical Applications............................................................................................................................................................................29