Data Sheet

LT7153SP

analog.com

Rev. A

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