Datasheet LTM4675 (Analog Devices) - 2

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Table oF conTenTs Features ... 1
Open-Drain Pins ..54
Applications .. 1
Phase-Locked Loop and Frequency Synchronization ..55
Typical Application .. 1
RCONFIG Pin-Straps (External Resistor
Description.. 1
Configuration Pins) ...56
Absolute Maximum Ratings .. 3
Voltage Selection ..56
Order Information .. 3
Connecting the USB to the I2C/SMBus/PMBus
Pin Configuration .. 3
Control er to the LTM4675 In System ...56
Electrical Characteristics ... 4
LTpowerPlay: An Interactive GUI for Digital Power
Typical Performance Characteristics ..11
System Management ..60
Pin Functions ..13
PMBus Communication and Command Processing ..61
Simplified Block Diagram ...18
Thermal Considerations and
Decoupling Requirements ...18
Output Current Derating ...62
Functional Diagram ..19
EMI Performance ..69
Test Circuits ...20
Safety Considerations ...69
Operation...21
Layout Checklist/Example ...69 Power Module Introduction ...21
Typical Applications ..71
Power Module Configurability and
Appendix A ...77
Readback Data ..23 Similarity Between PMBus, SMBus and I2C Time-Averaged and Peak Readback Data ..25 2-Wire Interface ..77 Power Module Overview ...28
Appendix B ...78
EEPROM ...32 PMBus Serial Digital Interface ..78 Serial Interface ..33
Appendix C: PMBus Command Details ..82
Device Addressing ..33 Addressing and Write Protect ...82 Fault Detection and Handling ..34 General Configuration Registers ...84 Responses to VOUT and IOUT Faults...35 On/Off/Margin ...85 Responses to Timing Faults ..36 PWM Config ...87 Responses to SVIN OV Faults ..36 Voltage ..89 Responses to OT/UT Faults ...36 Current ..92 Responses to External Faults ...36 Temperature ..95 Fault Logging ..37 Timing ...97 Bus Timeout Protection ..37 Fault Response ...99
PMBus Command Summary ..38
Fault Sharing ... 106 PMBus Commands ..38 Scratchpad .. 108 VIN to VOUT Step-Down Ratios ..48 Identification ... 108 Input Capacitors ..48 Fault Warning and Status .. 109 Output Capacitors ...48 Telemetry .. 116 Light Load Current Operation ..48 NVM (EEPROM) Memory Commands ... 120 Switching Frequency and Phase ...49
Package Description ... 127
Minimum On-Time Considerations .. 51
Package Photograph ... 129
Variable Delay Time, Soft-Start and Output Voltage
Package Description ... 130
Ramping ... 51
Revision History .. 131
Digital Servo Mode ...52
Typical Application ... 132
Soft Off (Sequenced Off) ..53
Design Resources .. 132
Undervoltage Lockout ...53
Related Parts .. 132
Fault Detection and Handling ..54 4675fb 2 For more information www.linear.com/LTM4675 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Simplified Block Diagram Decoupling Requirements Functional Diagram Test Circuits Operation Power Module Introduction Power Module Configurability and Readback Data Time-Averaged and Peak Readback Data Power Module Overview EEPROM Serial Interface Device Addressing Fault Detection and Handling Responses to VOUT and IOUT Faults Responses to Timing Faults Responses to SVIN OV Faults Responses to OT/UT Faults Responses to External Faults Fault Logging Bus Timeout Protection PMBus Command Summary PMBus Commands VIN to VOUT Step-Down Ratios Input Capacitors Output Capacitors Light Load Current Operation Switching Frequency and Phase Minimum On-Time Considerations Variable Delay Time, Soft-Start and Output Voltage Ramping Digital Servo Mode Soft Off (Sequenced Off) Undervoltage Lockout Fault Detection and Handling Open-Drain Pins Phase-Locked Loop and Frequency Synchronization RCONFIG Pin-Straps (External Resistor Configuration Pins) Voltage Selection Connecting the USB to the I2C/SMBus/PMBus Controller to the LTM4675 In System LTpowerPlay: An Interactive GUI for Digital Power System Management PMBus Communication and Command Processing Thermal Considerations and Output Current Derating EMI Performance Safety Considerations Layout Checklist/Example Typical Applications Appendix A Similarity Between PMBus, SMBus and I2C 2-Wire Interface Appendix B PMBus Serial Digital Interface Appendix C: PMBus Command Details Addressing and Write Protect General Configuration Registers On/Off/Margin PWM Config Voltage Current Temperature Timing Fault Response Fault Sharing Scratchpad Identification Fault Warning and Status Telemetry NVM (EEPROM) Memory Commands Package Description Package Photograph Package Description Revision History Typical Application Design Resources Related Parts