ADP3197 查看數據表（PDF） - Analog Devices

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ADP3197

6-Bit Programmable 2-/3-Phase Synchronous Buck Controller

Analog Devices 

ADP3197

TABLE OF CONTENTS

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

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

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

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

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

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

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

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

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

Typical Performance Characteristics ............................................. 8

Test Circuits....................................................................................... 9

Theory of Operation ...................................................................... 10

Start-Up Sequence...................................................................... 10

Phase Detection Sequence......................................................... 10

Master Clock Frequency............................................................ 11

Output Voltage Differential Sensing ........................................ 11

Output Current Sensing ............................................................ 11

Active Impedance Control Mode............................................. 11

Current Control Mode and Thermal Balance ........................ 11

Voltage Control Mode................................................................ 12

Current Reference ...................................................................... 12

Enhanced PWM Mode .............................................................. 12

Delay Timer................................................................................. 12

Soft Start ...................................................................................... 12

Current Limit, Short-Circuit, and Latch-Off Protection ...... 13

Dynamic VID.............................................................................. 13

REVISION HISTORY

5/07—Revision 0: Initial Version

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

Output Crowbar ......................................................................... 14

Output Enable and UVLO ........................................................ 14

Thermal Monitoring .................................................................. 14

Typical Application Circuit....................................................... 16

Applications Information .............................................................. 17

Setting the Clock Frequency..................................................... 17

Soft Start Delay Time................................................................. 17

Current-Limit Latch-Off Delay Times .................................... 17

Inductor Selection ...................................................................... 18

Current Sense Amplifier............................................................ 18

Inductor DCR Temperature Correction ................................. 19

Output Offset .............................................................................. 20

COUT Selection ............................................................................. 20

Power MOSFETs......................................................................... 21

Ramp Resistor Selection............................................................ 22

COMP Pin Ramp ....................................................................... 23

Current-Limit Setpoint.............................................................. 23

Feedback Loop Compensation Design.................................... 23

CIN Selection and Input Current di/dt Reduction.................. 25

Thermal Monitor Design .......................................................... 25

Shunt Resistor Design................................................................ 25

Tuning the ADP3197 ................................................................. 26

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

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

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

Rev. 0 | Page 2 of 32

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