Data Sheet

LT7153SP

analog.com

Rev 0

2 of 31

TABLE OF CONTENTS

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

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

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

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

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

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

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

Pin Configurations and Function Descriptions ....................................................................................................................................8

Typical Performance Characteristics .................................................................................................................................................11

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

Theory of Operation............................................................................................................................................................................16

Main Control Loop ..........................................................................................................................................................................16

Low IQ Shutdown (RUN)..................................................................................................................................................................16

INTVCC Regulator and Bypass Capacitor.........................................................................................................................................16

Adjustable Current Limit ................................................................................................................................................................17

Overcurrent and Short-Circuit Protection .....................................................................................................................................17

Multiphase Operation.....................................................................................................................................................................17

Power Good Status Output ............................................................................................................................................................17

VIN Overvoltage Protection .............................................................................................................................................................17

Selectable Load Line (AVPSEL).......................................................................................................................................................17

MODE, SYNC, Spread-Spectrum Operation ...................................................................................................................................17

Applications Information....................................................................................................................................................................18

Silent Switcher Architecture ..........................................................................................................................................................18

Programming Switching Frequency ..............................................................................................................................................18

Output Voltage Programming........................................................................................................................................................18

Soft-Start and Output Voltage TRACK............................................................................................................................................19

Inductor Selection ..........................................................................................................................................................................19

Input Capacitor (CIN) Selection .......................................................................................................................................................20

Output Capacitor (COUT) Selection ..................................................................................................................................................20

Using Ceramic Input and Output Capacitors.................................................................................................................................21

Minimum Off-Time and Minimum On-Time Considerations .........................................................................................................21

Multiphase Configuration...............................................................................................................................................................22

ITH Compensation..........................................................................................................................................................................23

Checking Transient Response ........................................................................................................................................................23