ADP3181JRUZ-REEL View Datasheet(PDF) - ON Semiconductor

Part Name

Description

Manufacturer

ADP3181JRUZ-REEL

5-Bit or 6-Bit Programmable 2-,3-,4-Phase Synchronous Buck Controller

ON Semiconductor 

ADP3181

TABLE OF CONTENTS

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

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

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

Pin Configuration and Function Descriptions............................. 7

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

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

Start-up Sequence......................................................................... 9

Master Clock Frequency............................................................ 10

Output Voltage Differential Sensing ........................................ 10

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

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

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

Voltage Control Mode................................................................ 11

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

Current Limit, Short-Circuit, and Latch-Off Protection....... 12

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

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

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

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

REVISION HISTORY

5/04—Revision 0: Initial Version

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

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

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

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

Cout Selection ............................................................................... 17

Power MOSFETS........................................................................ 18

Ramp Resistor Selection............................................................ 19

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

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

CIN Selection and Input Current di/dt Reduction.................. 21

Building a Switchable VR9/VR10 Design ............................... 22

Layout and Component Placement ............................................. 23

General Recommendations....................................................... 23

Outline Dimensions ....................................................................... 24

Ordering Guide .......................................................................... 24

Rev. 0 | Page 2 of 24

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