ADP3210 datasheet(2/38 Pages) ONSEMI

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ADP3210

Rev. 0.3 | Page 2 of 38

TABLE OF CONTENTS

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

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

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

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

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

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

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

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

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

Pin Configuration and Function Descriptions............................. 9

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

Theory of Operation ...................................................................... 14

Number of Phases....................................................................... 14

Operation Modes........................................................................ 14

Switch Frequency Setting .......................................................... 16

Output Voltage Differential Sensing ........................................ 16

Output Current Sensing ............................................................ 17

Active Impedance Control Mode............................................. 17

Current Control Mode and Thermal Balance ........................ 17

Voltage Control Mode................................................................ 18

Power-Good Monitoring........................................................... 18

Power-Up Sequence and Soft Start .......................................... 18

Soft Transient .............................................................................. 18

Current-Limit, Short-Circuit, and Latch-Off Protection...... 18

Changing VID on-the-Fly......................................................... 19

Output Crowbar ......................................................................... 19

Reverse Voltage Protection ....................................................... 19

Output Enable and UVLO ........................................................ 20

Output Current Monitor ........................................................... 20

Thermal Throttling Control ..................................................... 20

Application Information................................................................ 25

Setting the Clock Frequency for PWM Mode........................ 25

Inductor Selection ...................................................................... 25

COUT Selection ............................................................................. 27

Power MOSFETs......................................................................... 28

Ramp Resistor Selection............................................................ 29

Setting the Switching Frequency for RPM Mode Operation of

Phase 1 ......................................................................................... 29

Current-Limit Setpoint.............................................................. 30

Output Current monitor ........................................................... 30

Feedback Loop Compensation Design ................................... 30

CIN Selection and Input Current DI/DT Reduction ................ 31

RC Snubber ................................................................................. 31

Selecting Thermal Monitor Components ............................... 32

Tuning Procedure for ADP3210............................................... 32

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

Outline Dimensions ....................................................................... 36

Ordering Guide .......................................................................... 36

REVISION HISTORY

5/08—Revision 0: Initial Preliminary Version

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