ADP3212(OLD) Просмотр технического описания (PDF) - ON Semiconductor

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ADP3212
(Rev.:OLD)

7-Bit, Programmable, 3-Phase, Mobile CPU Synchronous Buck Controller

ON Semiconductor 

TABLE OF CONTENTS

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

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

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

Functional Block Diagram ...............................................................2

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

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

Timing Diagram................................................................................9

Absolute Maximum Ratings ..........................................................10

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

Pin Configuration and Function Descriptions ...........................11

Test Circuits .....................................................................................13

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

Theory of Operation .......................................................................15

Number of Phases .......................................................................15

Operation Modes ........................................................................15

Differential Sensing of Output Voltage ....................................19

Output Current Sensing .............................................................19

Active Impedance Control Mode..............................................19

Current Control Mode and Thermal Balance.........................20

Voltage Control Mode ................................................................20

Power-Good Monitoring............................................................20

Power-Up Sequence and Soft Start ...........................................21

Current Limit...............................................................................21

Changing VID on the Fly...........................................................21

REVISION HISTORY

4/08—Revision Sp0: Initial Version

ADP3212/NCP3218

Output Crowbar..........................................................................24

Reverse Voltage Protection ........................................................24

Output Enable and UVLO.........................................................24

Thermal Throttling Control ......................................................24

Application Information ................................................................28

Setting the Clock Frequency for PWM....................................28

Setting the Switching Frequency for RPM Operation of Phase

1 .....................................................................................................28

Soft Start and Current Limit Latch-Off Delay Times ............28

Inductor Selection.......................................................................28

COUT Selection..............................................................................31

Power MOSFETs .........................................................................32

Ramp Resistor Selection.............................................................33

Current Limit Setpoint...............................................................33

Current Monitor..........................................................................33

Feedback Loop Compensation Design ....................................33

CIN Selection and Input Current di/dt Reduction ..................35

RC Snubber..................................................................................35

Selecting Thermal Monitor Components................................35

Tuning Procedure for ADP3212/NCP3218.............................36

Layout and Component Placement ..........................................37

Outline Dimension .........................................................................39

Ordering Guide ...........................................................................41

Rev. SpA | Page 3 of 43

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