ADP3208CJCPZ-RL View Datasheet(PDF) - ON Semiconductor

Part Name

Description

Manufacturer

ADP3208CJCPZ-RL

7-Bit, Programmable, Dual-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............................................15

Theory of Operation .......................................................................19

Number of Phases .......................................................................19

Operation Modes ........................................................................19

Differential Sensing of Output Voltage ....................................22

Output Current Sensing .............................................................22

Active Impedance Control Mode..............................................22

CURRENT Control Mode AND THERMAL BALANCE ....23

Voltage Control Mode ................................................................23

Power-Good Monitoring............................................................23

Power-Up Sequence and Soft Start ...........................................23

Soft Transient...............................................................................24

Current Limit...............................................................................24

Changing VID on the Fly...........................................................25

REVISION HISTORY

5/08- Rev 1: Initial Preliminary Version

ADP3208C

OUTPUT CROWBAR ...............................................................26

Reverse Voltage Protection ........................................................27

Output Enable and UVLO.........................................................27

Thermal Throttling Control ......................................................27

CURRENT MONITOR FUNCTION ......................................27

Application Information ................................................................31

Setting the Clock Frequency for PWM....................................31

Setting the Switching Frequency for RPM Operation of Phase

1 .....................................................................................................31

Inductor Selection.......................................................................31

COUT Selection..............................................................................33

Power MOSFETs .........................................................................34

Ramp Resistor Selection.............................................................35

COMP Pin Ramp ........................................................................35

Current Limit Setpoint...............................................................36

Output Current monitor ............................................................36

Feedback Loop Compensation Design ....................................36

CIN Selection and Input Current di/dt Reduction ..................37

Selecting Thermal Monitor Components................................38

Tuning Procedure for ADP3208C ............................................38

Layout and Component Placement ..........................................39

Outline Dimension .........................................................................41

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

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