Datasheet LTM4677 (Analog Devices) - 2
| Manufacturer | Analog Devices |
| Description | Dual 18A or Single 36A μModule (Power Module) Regulator with Digital Power System Management |
| Pages / Page | 132 / 2 — Table oF conTenTs Features ... 1. PMBus Command Summary ..41. … |
| File Format / Size | PDF / 2.8 Mb |
| Document Language | English |
Table oF conTenTs Features ... 1. PMBus Command Summary ..41. Applications .. 1. Typical Application .. 1
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Table oF conTenTs Features ... 1 PMBus Command Summary ..41 Applications .. 1
PMBus Commands .. 41
Typical Application .. 1 Applications Information ..48 Description.. 1
VIN to VOUT Step-Down Ratios ..50
Absolute Maximum Ratings .. 4
Input Capacitors ... 51
Order Information .. 4
Output Capacitors ... 51
Pin Configuration .. 4
Light Load Current Operation ... 51
Electrical Characteristics ... 5
Switching Frequency and Phase ...52
Typical Performance Characteristics ..12
Minimum On-Time Considerations..53
Pin Functions ..15
Variable Delay Time, Soft-Start and Output Voltage
Simplified Block Diagram ...20
Ramping ...54
Decoupling Requirements ...20
Digital Servo Mode ...55
Functional Diagram ..21
Soft Off (Sequenced Off) ..56
Test Circuits ...22
Undervoltage Lockout ...56
Operation...23
Fault DETECTION AND HANDLING ...56 Power Module Introduction ..23 Open-Drain Pins ...57 Power Module Configurability and Phase-Locked Loop and Frequency Synchronization .. Readback Data ..25 58 Time-Averaged and Peak Readback Data ..28 RCONFIG Pin-Straps (External Resistor Power Module Overview ...31 Configuration Pins) ...58 EEPROM ...35 Voltage Selection ..59 Serial Interface ...36 Connecting the USB to the I2C/SMBus/PMBus Device Addressing ..36 Control er to the LTM4677 In System ...59 Fault Detection and Handling ..37 PMBus Communication and Command Processing 63 Responses to VOUT and IOUT Faults ..38 Thermal Considerations and Responses to Timing Faults ..39 Output Current Derating ...64 Responses to SVIN OV Faults ..39
Applications Information-Derating Curves ..69
Responses to OT/UT Faults ...39 EMI Performance ..71 Responses to External Faults ...40 Safety Considerations ...71 Fault Logging ..40 Layout Checklist/Example ..71 Bus Timeout Protection ..40
Typical Applications ..73
4677fa 2 For more information www.linear.com/LTM4677 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 Applications Information 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 LTM4677 In System PMBus Communication and Command Processing Thermal Considerations and Output Current Derating Applications Information-Derating Curves 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 Revision History Typical Application Design Resources Related Parts
Table oF conTenTs Features ... 1 PMBus Command Summary ..41 Applications .. 1
PMBus Commands .. 41
Typical Application .. 1 Applications Information ..48 Description.. 1
VIN to VOUT Step-Down Ratios ..50
Absolute Maximum Ratings .. 4
Input Capacitors ... 51
Order Information .. 4
Output Capacitors ... 51
Pin Configuration .. 4
Light Load Current Operation ... 51
Electrical Characteristics ... 5
Switching Frequency and Phase ...52
Typical Performance Characteristics ..12
Minimum On-Time Considerations..53
Pin Functions ..15
Variable Delay Time, Soft-Start and Output Voltage
Simplified Block Diagram ...20
Ramping ...54
Decoupling Requirements ...20
Digital Servo Mode ...55
Functional Diagram ..21
Soft Off (Sequenced Off) ..56
Test Circuits ...22
Undervoltage Lockout ...56
Operation...23
Fault DETECTION AND HANDLING ...56 Power Module Introduction ..23 Open-Drain Pins ...57 Power Module Configurability and Phase-Locked Loop and Frequency Synchronization .. Readback Data ..25 58 Time-Averaged and Peak Readback Data ..28 RCONFIG Pin-Straps (External Resistor Power Module Overview ...31 Configuration Pins) ...58 EEPROM ...35 Voltage Selection ..59 Serial Interface ...36 Connecting the USB to the I2C/SMBus/PMBus Device Addressing ..36 Control er to the LTM4677 In System ...59 Fault Detection and Handling ..37 PMBus Communication and Command Processing 63 Responses to VOUT and IOUT Faults ..38 Thermal Considerations and Responses to Timing Faults ..39 Output Current Derating ...64 Responses to SVIN OV Faults ..39
Applications Information-Derating Curves ..69
Responses to OT/UT Faults ...39 EMI Performance ..71 Responses to External Faults ...40 Safety Considerations ...71 Fault Logging ..40 Layout Checklist/Example ..71 Bus Timeout Protection ..40
Typical Applications ..73
4677fa 2 For more information www.linear.com/LTM4677 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 Applications Information 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 LTM4677 In System PMBus Communication and Command Processing Thermal Considerations and Output Current Derating Applications Information-Derating Curves 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 Revision History Typical Application Design Resources Related Parts
