Data Sheet

LT8615

analog.com

Rev 0

2 of 31

TABLE OF CONTENTS

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

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

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

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

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

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

Absolute Maximum Ratings (1)...................................................................................................................................................................6

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

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

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

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

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

Achieving Ultralow Quiescent Current ..............................................................................................................................................17

FB Resistor Network............................................................................................................................................................................18

Setting the Switching Frequency .......................................................................................................................................................19

Operating Frequency Selection and Trade-Offs ...............................................................................................................................19

Inductor Selection and Maximum Output Current ...........................................................................................................................20

Input Capacitor....................................................................................................................................................................................21

Output Capacitor and Output Ripple.................................................................................................................................................21

Ceramic Capacitors.............................................................................................................................................................................22

Enable Pin............................................................................................................................................................................................22

INTVCC Regulator..................................................................................................................................................................................23

Output Voltage Tracking and Soft-Start............................................................................................................................................23

Output Power Good ............................................................................................................................................................................23

Synchronization ..................................................................................................................................................................................23

Shorted and Reversed Input Protection............................................................................................................................................24

PCB Layout ..........................................................................................................................................................................................24

Thermal Considerations and Peak Current Output ..........................................................................................................................25

Typical Applications ................................................................................................................................................................................27

Outline Dimensions .................................................................................................................................................................................29

Ordering Guide.........................................................................................................................................................................................30

Related Parts............................................................................................................................................................................................30