Data Sheet

ADPL74101

analog.com

Rev. 0

2 of 49

TABLE OF CONTENTS

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

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

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

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

Revision History ....................................................................................................................................................................................4

Specifications........................................................................................................................................................................................5

Absolute Maximum Ratings ..................................................................................................................................................................9

Electrostatic Discharge (ESD).........................................................................................................................................................10

ESD Caution ....................................................................................................................................................................................10

Pin Configurations and Function Descriptions ..................................................................................................................................11

Typical Performance Characteristics .................................................................................................................................................14

Functional diagram.............................................................................................................................................................................18

Theory of Operation............................................................................................................................................................................19

Main Control Loop ..........................................................................................................................................................................19

Power and Bias Supplies (VIN, EXTVCC, DRVCC, and INTVCC)..............................................................................................................19

High-Side Bootstrap Capacitor ......................................................................................................................................................19

Dead Time Control..........................................................................................................................................................................19

Startup and Shutdown (RUN and TRACK/SS Pins) ........................................................................................................................20

Light Load Operation: Burst Mode Operation, Pulse-Skipping, or Forced Continuous Mode (MODE Pin) ..................................20

Frequency Selection, Spread Spectrum, and Phase-Locked Loop (FREQ and PLLIN/SPREAD Pins)..........................................21

Output Overvoltage Protection......................................................................................................................................................22

Foldback Current............................................................................................................................................................................22

Power Good ....................................................................................................................................................................................22

Applications Information....................................................................................................................................................................23

Use Cases ........................................................................................................................................................................................23

Inductor Value Calculation.............................................................................................................................................................23

Inductor Core Selection..................................................................................................................................................................23

Current Sense Selection .................................................................................................................................................................24

Low Value Resistor Current Sensing ..............................................................................................................................................24

Inductor DCR Current Sensing .......................................................................................................................................................25

Setting the Operating Frequency...................................................................................................................................................27

Selecting the Light-Load Operating Mode .....................................................................................................................................28

Dead Time Control..........................................................................................................................................................................29

Power FET Selection.......................................................................................................................................................................29