Data Sheet

LT83201

analog.com

Rev. A 2 of 45

TABLE OF CONTENTS

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

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

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

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

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

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

Absolute Maximum Ratings ..................................................................................................................................................................7

Pin Configurations and Function Descriptions ....................................................................................................................................8

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

Block Diagram .....................................................................................................................................................................................18

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

Applications Information....................................................................................................................................................................20

Low Frequency Output Noise.........................................................................................................................................................20

Filtering Switching Ripple and High Frequency Noise ..................................................................................................................20

PCB Layout Recommendations .....................................................................................................................................................21

Forced Continuous Mode (FCM).....................................................................................................................................................23

Discontinuous Conduction Mode (DCM) ........................................................................................................................................23

Synchronization..............................................................................................................................................................................24

Setting the Switching Frequency ...................................................................................................................................................24

Operating Frequency Selection and Trade-Offs ............................................................................................................................24

Inductor Selection and Maximum Output Current........................................................................................................................25

Overcurrent Protection (OCP) and Hiccup Mode...........................................................................................................................27

Input Capacitors .............................................................................................................................................................................27

Output Capacitor and Output Ripple.............................................................................................................................................27

Output Voltage................................................................................................................................................................................28

Output Voltages Above 13V ............................................................................................................................................................30

Output Voltages Below 0.5V ...........................................................................................................................................................30

Output Sensing and Stability .........................................................................................................................................................30

Frequency Compensation ..............................................................................................................................................................31

EN/UVLO Pin ...................................................................................................................................................................................31

INTVCC Regulator .............................................................................................................................................................................32

Set Pin Capacitor: Noise and Soft-Start.........................................................................................................................................32

Fast Start-Up...................................................................................................................................................................................35

Programmable Power Good...........................................................................................................................................................35