LT8640 datasheet(2/35 Pages) AD

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Data Sheet

LT8638-2

analog.com

Rev.0

2 of 35

TABLE OF CONTENTS

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

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

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

Simplified Application Diagram.............................................1

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

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

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

Pin Configurations and Function Descriptions.....................6

Typical Performance Characteristics ....................................9

BLOCK DIAGRAM ...................................................................16

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

Applications Information .....................................................17

Low EMI PCB Layout.........................................................17

Burst Mode Operation......................................................18

Forced Continuous Mode.................................................20

Spread Spectrum Mode ...................................................20

Synchronization ...............................................................20

FB Resistor Network.........................................................21

Setting the Switching Frequency....................................21

Operating Frequency Selection and Trade-Offs ............22

Inductor Selection and Maximum Output Current........22

Input Capacitors ..............................................................24

Output Capacitor and Output Ripple .............................24

Ceramic Capacitors..........................................................24

Enable Pin.........................................................................25

INTVCC Regulator ..............................................................25

Frequency Compensation...............................................25

Output Voltage Tracking and Soft-Start.........................26

Multiphase Operation......................................................27

Output Power Good.........................................................27

Shorted and Reversed Input Protection ........................27

Thermal Considerations and Peak Output Current.......28

TYPICAL APPLICATIONS .......................................................29

PACKAGE DESCRIPTION.......................................................32

RELATED PARTS....................................................................32

Ordering Guide .....................................................................34

REVISION HISTORY

10/2023 - Rev.0

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