ADP3188 데이터 시트보기 (PDF) - Analog Devices

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ADP3188

6-Bit Programmable 2-/3-/4-Phase Synchronous Buck Controller

Analog Devices 

ADP3188

TABLE OF CONTENTS

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

Test Circuits....................................................................................... 5

Absolute Maximum Ratings............................................................ 6

ESD Caution.................................................................................. 6

Pin Configuration and Function DescriptionS ............................ 7

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

Theory of Operation ........................................................................ 9

Start-Up Sequence........................................................................ 9

Master Clock Frequency.............................................................. 9

Output Voltage Differential Sensing .......................................... 9

Output Current Sensing .............................................................. 9

Active Impedance Control Mode............................................. 10

Current-Control Mode and Thermal Balance........................ 10

Voltage Control Mode................................................................ 10

Soft Start ...................................................................................... 10

Current-Limit, Short-Circuit, and Latch-Off Protection...... 11

Dynamic VID.............................................................................. 11

Power Good Monitoring ........................................................... 12

Output Crowbar ......................................................................... 13

Output Enable and UVLO ........................................................ 13

Application Information................................................................ 15

Setting the Clock Frequency ..................................................... 15

Soft Start and Current-Limit Latch-Off Delay Times ........... 15

Inductor Selection ...................................................................... 15

Designing an Inductor............................................................... 16

Selecting a Standard Inductor .............................................. 16

Output Droop Resistance.......................................................... 16

Inductor DCR Temperature Correction ................................. 17

Output Offset .............................................................................. 17

COUT Selection ............................................................................. 18

Power MOSFETs......................................................................... 18

Ramp Resistor Selection............................................................ 20

COMP Pin Ramp ....................................................................... 20

Current-Limit Setpoint.............................................................. 20

Feedback Loop Compensation Design.................................... 20

CIN Selection and Input Current di/dt Reduction.................. 22

Tuning the ADP3188 ................................................................. 23

DC Loadline Setting .............................................................. 23

AC Loadline Setting............................................................... 24

Layout and Component Placement.............................................. 26

General Recommendations....................................................... 26

Power Circuitry Recommendations ........................................ 26

Signal Circuitry Recommendations......................................... 26

Outline Dimensions ....................................................................... 27

Ordering Guide .......................................................................... 27

REVISION HISTORY

4/05—Rev. 0 to Rev. A

Changes to Figure 10.........................................................................14

Changes to Ordering Guide .............................................................27

4/04—Revision 0: Initial Version

Rev. A | Page 2 of 28

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