LTM4631 datasheet(2/130 Pages) AD

2 / 130 page

LTM4686B

Rev. 0

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TABLE OF CONTENTS

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

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

Typical Application ........................................ 1

Description.................................................. 1

Absolute Maximum Ratings.............................. 3

Order Information.......................................... 3

Pin Configuration .......................................... 3

Electrical Characteristics................................. 4

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

Pin Functions ..............................................13

Simplified Block Diagram ...............................18

Decoupling Requirements...............................18

Functional Diagram ......................................19

Test Circuits ...............................................20

Operation...................................................21

Power Module Introduction ....................................21

Power Module Configurability and

Readback Data........................................................23

Time-Averaged and Peak Readback Data................25

Power Module Overview.........................................28

EEPROM .................................................................32

Serial Interface .......................................................33

Device Addressing..................................................33

Fault Detection and Handling..................................34

Responses to VOUT and IOUT Faults ........................35

Responses to Timing Faults....................................36

Responses to SVIN OV Faults..................................36

Responses to OT/UT Faults.....................................36

Responses to External Faults .................................37

Fault Logging..........................................................37

Bus Timeout Protection ..........................................37

PMBus Command Summary ............................38

PMBus Commands ................................................38

Applications Information ................................45

VIN to VOUT Step-Down Ratios................................48

Input Capacitors .....................................................48

Output Capacitors...................................................48

Light Load Current Operation .................................48

Switching Frequency and Phase .............................49

Minimum On-Time Considerations.......................... 51

Variable Delay Time, Soft-Start and Output Voltage

Ramping ................................................................. 51

Digital Servo Mode .................................................52

Soft Off (Sequenced Off)........................................53

Undervoltage Lockout.............................................53

Fault Detection and Handling..................................54

Open-Drain Pins .....................................................54

Phase-Locked Loop and Frequency Synchronization .. 55

RCONFIG Pin-Straps (External Resistor

Configuration Pins).................................................56

Voltage Selection....................................................56

Connecting the USB to the I2C/SMBus/PMBus

Controller to the LTM4686B In System...................56

LTpowerPlay: An Interactive GUI for Digital Power

System Management..............................................60

PMBus Communication and Command Processing 61

Thermal Considerations and

Output Current Derating .........................................62

EMI Performance....................................................69

Safety Considerations.............................................69

Layout Checklist/Example ......................................69

Typical Applications ......................................71

Appendix A.................................................77

Similarity Between PMBus, SMBus and I2C

2-Wire Interface......................................................77

Appendix B.................................................78

PMBus Serial Digital Interface ................................78

Appendix C: PMBus Command Details ................82

Addressing and Write Protect.................................82

General Configuration Registers.............................84

On/Off/Margin ........................................................85

PWM Config ...........................................................86

Voltage....................................................................89

Current....................................................................92

Temperature............................................................95

Timing ....................................................................96

Fault Response .......................................................99

Fault Sharing......................................................... 105

Scratchpad ........................................................... 108

Identification......................................................... 108

Fault Warning and Status...................................... 109

Telemetry.............................................................. 116

NVM (EEPROM) Memory Commands .................. 120

Package Description ................................... 127

Package Photos ......................................... 128

Package Description ................................... 129

Typical Application ..................................... 130

Design Resources ...................................... 130

Related Parts ............................................ 130

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