LTM4675 datasheet(2/136 Pages) LINER

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LTM4676A

4676afa

For more information www.linear.com/LTM4676A

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 .................................................... 14

Simplified Block Diagram ..................................... 19

Decoupling Requirements..................................... 19

Functional Diagram ............................................ 20

Test Circuits ..................................................... 21

Operation......................................................... 22

Power Module Introduction............................................22

Power Module Configurability and Readback Data ........ 24

Time-Averaged and Peak Readback Data.......................26

Power Module Overview ................................................30

EEPROM.........................................................................33

Serial Interface...............................................................34

Device Addressing .........................................................35

Fault Detection and Handling .........................................35

Responses to VOUT and IOUT Faults................................36

Responses to Timing Faults...........................................37

Responses to SVIN OV Faults.........................................38

Responses to OT/UT Faults............................................38

Responses to External Faults ........................................38

Fault Logging .................................................................38

Bus Timeout Protection .................................................39

PMBus Command Summary .................................. 40

PMBus Commands .......................................................40

VIN to VOUT Step-Down Ratios....................................... 51

Input Capacitors............................................................. 51

Output Capacitors .......................................................... 51

Light Load Current Operation......................................... 51

Switching Frequency and Phase ....................................52

Minimum On-Time Considerations.................................54

Variable Delay Time, Soft-Start and Output Voltage

Ramping.........................................................................54

Digital Servo Mode ........................................................55

Soft Off (Sequenced Off) ...............................................56

Undervoltage Lockout....................................................56

Fault Detection and Handling .........................................57

Open-Drain Pins.............................................................57

Phase-Locked Loop and Frequency Synchronization.....58

RCONFIG Pin-Straps (External Resistor

Configuration Pins) ........................................................59

Voltage Selection ...........................................................59

Connecting the USB to the I2C/SMBus/PMBus

Controller to the LTM4676A In System..........................59

LTpowerPlay: An Interactive GUI for Digital Power

System Management .....................................................63

PMBus Communication and Command Processing.......64

Thermal Considerations and Output Current Derating ...65

EMI Performance ...........................................................73

Safety Considerations.................................................... 74

Layout Checklist/Example.............................................. 74

Typical Applications ............................................ 75

Appendix A....................................................... 81

Similarity Between PMBus, SMBus and I2C

2-Wire Interface .............................................................81

Appendix B....................................................... 82

PMBus Serial Digital Interface .......................................82

Appendix C: PMBus Command Details ...................... 86

Addressing and Write Protect ........................................86

General Configuration Registers ....................................88

On/Off/Margin................................................................89

PWM Config...................................................................91

Voltage...........................................................................93

Current ...........................................................................96

Temperature...................................................................99

Timing.......................................................................... 100

Fault Response............................................................. 102

Fault Sharing................................................................ 110

Scratchpad................................................................... 112

Identification ................................................................ 112

Fault Warning and Status............................................. 114

Telemetry ..................................................................... 121

NVM (EEPROM) Memory Commands.......................... 125

Package Description ......................................... 132

Package Photograph ......................................... 133

Package Description ......................................... 134

Revision History .............................................. 135

Typical Application ........................................... 136

Design Resources ............................................ 136

Related Parts .................................................. 136

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