LT8608 datasheet(3/35 Pages) AD

3 / 35 page

Data Sheet

LT8641A

analog.com

Rev 0

3 of 35

TABLE OF CONTENTS

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

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

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

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

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

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

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

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

Typical Performance Characteristics .................................10

Block Diagram.....................................................................17

Theory of Operation............................................................17

Applications Information....................................................19

Low EMI PCB Layout .......................................................19

Achieving Ultralow Quiescent Current...........................20

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

Setting the Switching Frequency ...................................22

Operating Frequency Selection and Trade-Offs............ 23

Inductor Selection and Maximum Output Current ....... 23

Input Capacitors............................................................. 25

Output Capacitor and Output Ripple ............................ 25

Ceramic Capacitors........................................................ 25

Enable Pin....................................................................... 26

INTVCC Regulator............................................................. 26

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

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

Synchronization and Spread Spectrum ........................ 27

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

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

Typical Applications Circuits.............................................. 30

Outline Dimensions ............................................................ 33

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

Related Parts ...................................................................... 34

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