ADP3207

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TABLE OF CONTENTS

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

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

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

Functional Block Diagram...............................................................1

Revision History................................................................................2

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

Test Circuits .......................................................................................6

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

ESD Caution ..................................................................................7

Pin Configuration and Function Descriptions .............................8

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

Theory of Operation.......................................................................11

Number of Phases .......................................................................11

Operation Modes ........................................................................11

Switch Frequency Setting...........................................................12

Output Voltage Differential Sensing ........................................12

Output Current Sensing .............................................................12

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

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

Voltage Control Mode ................................................................13

Power-Good Monitoring ...........................................................13

Power-Up Sequence and Soft Start ...........................................14

Soft Transient...............................................................................14

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

Changing VID on-the-Fly .........................................................15

Output Crowbar..........................................................................15

Reverse Voltage Protection ........................................................16

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

Thermal Throttling Control......................................................16

Application Information ................................................................19

Setting the Clock Frequency for PWM Mode ........................19

Soft-Start and Current-Limit Latch-Off Delay Times ...........19

PWRGD Delay Timer ................................................................19

Inductor Selection.......................................................................19

Power MOSFETs .........................................................................22

Ramp Resistor Selection ............................................................23

Setting the Switching Frequency for RPM Mode Operation of

Phase 1..........................................................................................23

Current-Limit Setpoint ..............................................................24

Feedback Loop Compensation Design ....................................24

Soft Transient Setting .................................................................25

Selecting Thermal Monitor Components................................25

Tuning Procedure for ADP3207 ...............................................25

Layout and Component Placement..........................................27

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

Ordering Guide ...........................................................................29

REVISION HISTORY

02/08—Rev 1: Conversion to ON Semiconductor

1/06—Revision 0: Initial Version