ADP3168

Rev. B | Page 2 of 24

TABLE OF CONTENTS

Specifications..................................................................................... 3

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

ESD Caution.................................................................................. 5

Pin Configuration and Function Descriptions............................. 6

Typical Performance Characteristics and Test Circuits............... 7

Theory of Operation ........................................................................ 9

Number of Phases......................................................................... 9

Master Clock Frequency.............................................................. 9

Output Voltage Differential Sensing .......................................... 9

Output Current Sensing .............................................................. 9

Active Impedance Control Mode............................................. 10

Current-Control Mode and Thermal Balance........................ 10

Voltage Control Mode................................................................ 10

Soft Start ...................................................................................... 10

Current-Limit, Short-Circuit, and Latch-Off Protection...... 11

Dynamic VID.............................................................................. 12

Power-Good Monitoring........................................................... 12

Output Crowbar ......................................................................... 12

Output Enable and UVLO ........................................................ 12

Application Information................................................................ 13

Setting the Clock Frequency ..................................................... 13

Soft Start and Current Limit Latch-Off Delay Times............ 13

Inductor Selection ...................................................................... 13

Designing an Inductor............................................................... 15

Selecting a Standard Inductor................................................... 15

Output Droop Resistance.......................................................... 15

Inductor DCR Temperature Correction ................................. 16

Output Offset .............................................................................. 16

COUT Selection ............................................................................. 17

Power MOSFETs......................................................................... 18

Ramp Resistor Selection............................................................ 19

COMP Pin Ramp ....................................................................... 19

Current-Limit Set Point............................................................. 19

Feedback Loop Compensation Design.................................... 19

CIN Selection and Input Current di/dt Reduction.................. 21

Tuning Procedure for the ADP3168 ........................................ 21

Layout and Component Placement.............................................. 23

General Recommendations....................................................... 23

Power Circuitry .......................................................................... 23

Signal Circuitry........................................................................... 23

Outline Dimensions ....................................................................... 24

Ordering Guide .......................................................................... 24

REVISION HISTORY

11/04—Rev. A to Rev. B

Changes to Specifications ................................................................ 3

Updated Outline Dimensions ....................................................... 24

Changes to Ordering Guide .......................................................... 24

4/03—Data Sheet Changed from Rev. 0 to Rev. A.

Changes to Specifications ................................................................ 2