ADP3189 datasheet(2/36 Pages) AD

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ADP3189

Rev. 0 | Page 2 of 36

TABLE OF CONTENTS

Functional Block Diagram .............................................................. 3

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

Test Circuits....................................................................................... 7

Absolute Maximum Ratings............................................................ 8

ESD Caution.................................................................................. 8

Pin Configuration and Function DescriptionS ............................ 9

Typical Performance Characteristics ........................................... 11

Theory of Operation ...................................................................... 12

Start-Up Sequence...................................................................... 12

Phase Detection Sequence......................................................... 12

Master Clock Frequency............................................................ 13

Output Voltage Differential Sensing ........................................ 13

Output Current Sensing ............................................................ 13

Active Impedance Control Mode............................................. 13

Current Control Mode and Thermal Balance ........................ 13

Voltage Control Mode................................................................ 14

Delay Timer................................................................................. 14

Soft Start ...................................................................................... 14

Current Limit, Short Circuit, and Latch-Off Protection....... 15

Dynamic VID.............................................................................. 15

Power Good Monitoring ........................................................... 15

Output Crowbar ......................................................................... 16

Output Enable and UVLO ........................................................ 16

Thermal Monitoring .................................................................. 16

Application Information................................................................ 22

Setting the Clock Frequency ..................................................... 22

Soft Start Delay Time ................................................................. 22

Current Limit Latch-Off Delay Times..................................... 22

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

Designing an Inductor............................................................... 23

Selecting a Standard Inductor .............................................. 23

Current Sense Amplifier............................................................ 24

Inductor DCR Temperature Correction ................................. 24

Load Line Setting........................................................................ 25

Output Offset .............................................................................. 26

COUT Selection ............................................................................. 26

Power MOSFETs......................................................................... 27

Ramp Resistor Selection............................................................ 28

COMP Pin Ramp ....................................................................... 28

Current Limit SetPoint .............................................................. 29

Feedback Loop Compensation Design.................................... 29

CIN Selection and Input Current di/dt Reduction.................. 31

Thermal Monitor Design .......................................................... 31

Tuning the ADP3189 ................................................................. 32

DC Loadline Setting .............................................................. 32

AC Loadline Setting............................................................... 33

Initial Transient Setting ......................................................... 33

Layout and Component Placement ......................................... 34

General Recommendations .................................................. 34

Power Circuitry Recommendations .................................... 34

Signal Circuitry Recommendations .................................... 34

Outline Dimensions ....................................................................... 35

Ordering Guide .......................................................................... 35

REVISION HISTORY

7/05—Revision 0: Initial Version

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