Datasheet LTM4678 (Analog Devices) - 2
| Manufacturer | Analog Devices |
| Description | Dual 25A or Single 50A µModule Regulator with Digital Power System Management |
| Pages / Page | 124 / 2 — TABLE OF CONTENTS Features ... 1. Applications .. 1. Typical Application … |
| Revision | A |
| File Format / Size | PDF / 6.6 Mb |
| Document Language | English |
TABLE OF CONTENTS Features ... 1. Applications .. 1. Typical Application .. 1. Description.. 1. Table of Contents .. 2
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TABLE OF CONTENTS Features ... 1
FSWPH_CFG Pin Strapping Look-Up Table to Set
Applications .. 1
the LTM4678’s Switching Frequency and Channel
Typical Application .. 1
Phase-Interleaving Angle (Not Applicable if
Description.. 1
MFR_CONFIG_ALL[6] = 1b) ...31
Table of Contents .. 2
ASEL Pin Strapping Look-Up Table to Set the
Absolute Maximum Ratings .. 4
LTM4678’s Slave Address (Applicable Regardless
Order Information .. 4
of MFR_CONFIG_ALL[6] Setting) ..32
Pin Configuration .. 4
LTM4678 MFR_ADDRESS Command Examples
Electrical Characteristics ... 5
Expressed in 7- and 8-Bit Addressing ..32
Typical Performance Characteristics ..12
Fault Detection and Handling ...32
Pin Functions ..15
Status Registers and ALERT Masking ..33
Simplified Block Diagram ...19
Mapping Faults to FAULT Pins ...35
Decoupling Requirements ...19
Power Good Pins ...35
Functional Diagram ..20
CRC Protection ..35
Test Circuits ...21
Serial Interface ...35
Operation...22
Communication Protection ..35 Power Module Introduction ...22 Device Addressing ...35 Power Module Overview, Major Features ..22 Responses to VOUT and IIN/IOUT Faults ..36 EEPROM with ECC ...23 Output Overvoltage Fault Response ...36 Power-Up and Initialization .. 24 Output Undervoltage Response ...37 Soft-Start ...25 Peak Output Overcurrent Fault Response ..37 Time-Based Sequencing ..25 Responses to Timing Faults ...37 Voltage-Based Sequencing ..25 Responses to VIN OV Faults ...37 Shutdown ..26 Responses to OT/UT Faults ..37 Light-Load Current Operation ..26 Internal Overtemperature Fault Response ..37 Switching Frequency and Phase ...27 External Overtemperature and Undertemperature PWM Loop Compensation ...27 Fault Response ..38 Output Voltage Sensing ...27 Responses to Input Overcurrent and Output INTVCC/EXTVCC Power ..27 Undercurrent Faults ...38 Output Current Sensing and Sub Mil iohm DCR Responses to External Faults ...38 Current Sensing ...28 Fault Logging ...38 Input Current Sensing ..28 Bus Timeout Protection ...38 PolyPhase Load Sharing ..28 Similarity Between PMBus, SMBus and I2C External/Internal Temperature Sense ...29 2-Wire Interface ...39 RCONFIG (Resistor Configuration) Pins ...29 PMBus Serial Digital Interface ...39 VOUTn _CFG Pin Strapping Look-Up Table for the Abbreviations of Supported Data Formats ...40 LTM4678’s Output Voltage, Coarse Setting (Not Figure 7 to Figure 24 PMBus Protocols .. 41 Applicable if MFR_CONFIG_ALL[6] = 1b) ...29
PMBus Command Summary ..44
VTRIMn_CFG Pin Strapping Look-Up Table for the PMBus Commands ..44 LTM4678’s Output Voltage, Fine Adjustment Setting PMBus Commands Summary (Note: The Data (Not Applicable if MFR_CONFIG_ALL[6] = 1b) ..30 Format Abbreviations are Detailed in Table 8) ..44 Data Format Abbreviations ..49 Rev. A 2 For more information www.analog.com Document Outline Features Applications Typical Application Description Table of Contents 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 Overview, Major Features EEPROM with ECC Power-Up and Initialization Soft-Start Time-Based Sequencing Voltage-Based Sequencing Shutdown Light-Load Current Operation Switching Frequency and Phase PWM Loop Compensation Output Voltage Sensing INTVCC/EXTVCC Power Output Current Sensing and Sub Milliohm DCR Current Sensing Input Current Sensing PolyPhase Load Sharing External/Internal Temperature Sense RCONFIG (Resistor Configuration) Pins VOUTn _CFG Pin Strapping Look-Up Table for the LTM4678’s Output Voltage, Coarse Setting (Not Applicable if MFR_CONFIG_ALL[6] = 1b) VTRIMn_CFG Pin Strapping Look-Up Table for the LTM4678’s Output Voltage, Fine Adjustment Setting (Not Applicable if MFR_CONFIG_ALL[6] = 1b) FSWPH_CFG Pin Strapping Look-Up Table to Set the LTM4678’s Switching Frequency and Channel Phase-Interleaving Angle (Not Applicable if MFR_CONFIG_ALL[6] = 1b) ASEL Pin Strapping Look-Up Table to Set the LTM4678’s Slave Address (Applicable Regardless of MFR_CONFIG_ALL[6] Setting) LTM4678 MFR_ADDRESS Command Examples Expressed in 7- and 8-Bit Addressing Fault Detection and Handling Status Registers and ALERT Masking Mapping Faults to FAULT Pins Power Good Pins CRC Protection Serial Interface Communication Protection Device Addressing Responses to VOUT and IIN/IOUT Faults Output Overvoltage Fault Response Output Undervoltage Response Peak Output Overcurrent Fault Response Responses to Timing Faults Responses to VIN OV Faults Responses to OT/UT Faults Internal Overtemperature Fault Response External Overtemperature and Undertemperature Fault Response Responses to Input Overcurrent and Output Undercurrent Faults Responses to External Faults Fault Logging Bus Timeout Protection Similarity Between PMBus, SMBus and I2C 2-Wire Interface PMBus Serial Digital Interface Abbreviations of Supported Data Formats Figure 7 to Figure 24 PMBus Protocols PMBus Command Summary PMBus Commands PMBus Commands Summary (Note: The Data Format Abbreviations are Detailed in Table 8) Data Format Abbreviations Applications Information VIN to VOUT Step-Down Ratios Input Capacitors Output Capacitors Light Load Current Operation Switching Frequency and Phase Recommended Switching Frequency for Various VIN-to-VOUT Step-Down Scenarios Output Current Limit Programming 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 Input Current Sense Amplifier Programmable Loop Compensation Checking Transient Response PolyPhase Configuration Connecting The USB to I2C/SMBus/PMBus Controller to the LTM4678 In System LTpowerPlay: An Interactive GUI for Digital Power PMBus Communication and Command Processing Thermal Considerations and Output Current Derating Table 10 thru Table 11: Output Current Derating 0.9V Output 1.8V Output Channel Output Voltage vs Component Selection, 0A to 12.5A/μs Load Step Output Capacitor-GRM32ER60G337ME05L, 330μF, 4V, X5R, Murata Low VOUT Range for VOUT ≤ 2.5V High VOUT Range for 2.5V ≤ VOUT ILIMIT Range = High Channel Output Voltage vs Component Selection, 0A to 12.5A/μs Load Step Low VOUT Range for VOUT ≤ 2.5V High VOUT Range for 2.5V ≤ VOUT ILIMIT Range = High Dual Phase Single Output – Ceramic and Poscap Output Capacitors Applications Information-Derating Curves EMI Performance Safety Considerations Layout Checklist/Example Typical Applications PMBus Command Details Addressing and Write Protect General Configuration Commands On/Off/Margin PWM Configuration Voltage Input Voltage and Limits Output Voltage and Limits Output Current and Limits Input Current and Limits Temperature Power Stage DCR Temperature Calibration Timing Timing—On Sequence/Ramp Timing—Off Sequence/Ramp Precondition for Restart Fault Response Fault Responses All Faults Fault Responses Input Voltage Fault Responses Output Voltage VOUT_OV_FAULT_RESPONSE Data Byte Contents VOUT_UV_FAULT_RESPONSE Data Byte Contents Fault Responses Output Current OUT_OC_FAULT_RESPONSE Data Byte Contents Fault Responses IC Temperature Data Byte Contents MFR_OT_FAULT_RESPONSE Fault Responses External Temperature Fault Sharing Fault Sharing Propagation FAULTn Propagate Fault Configuration Fault Sharing Response Scratchpad Identification Fault Warning and Status Telemetry NVM Memory Commands Store/Restore Fault Logging Fault Logging Explanation of Position_Fault Values Block Memory Write/Read Package Description LTM4678 BGA Pinout Revision History Package Photograph Design Resources Related Parts
TABLE OF CONTENTS Features ... 1
FSWPH_CFG Pin Strapping Look-Up Table to Set
Applications .. 1
the LTM4678’s Switching Frequency and Channel
Typical Application .. 1
Phase-Interleaving Angle (Not Applicable if
Description.. 1
MFR_CONFIG_ALL[6] = 1b) ...31
Table of Contents .. 2
ASEL Pin Strapping Look-Up Table to Set the
Absolute Maximum Ratings .. 4
LTM4678’s Slave Address (Applicable Regardless
Order Information .. 4
of MFR_CONFIG_ALL[6] Setting) ..32
Pin Configuration .. 4
LTM4678 MFR_ADDRESS Command Examples
Electrical Characteristics ... 5
Expressed in 7- and 8-Bit Addressing ..32
Typical Performance Characteristics ..12
Fault Detection and Handling ...32
Pin Functions ..15
Status Registers and ALERT Masking ..33
Simplified Block Diagram ...19
Mapping Faults to FAULT Pins ...35
Decoupling Requirements ...19
Power Good Pins ...35
Functional Diagram ..20
CRC Protection ..35
Test Circuits ...21
Serial Interface ...35
Operation...22
Communication Protection ..35 Power Module Introduction ...22 Device Addressing ...35 Power Module Overview, Major Features ..22 Responses to VOUT and IIN/IOUT Faults ..36 EEPROM with ECC ...23 Output Overvoltage Fault Response ...36 Power-Up and Initialization .. 24 Output Undervoltage Response ...37 Soft-Start ...25 Peak Output Overcurrent Fault Response ..37 Time-Based Sequencing ..25 Responses to Timing Faults ...37 Voltage-Based Sequencing ..25 Responses to VIN OV Faults ...37 Shutdown ..26 Responses to OT/UT Faults ..37 Light-Load Current Operation ..26 Internal Overtemperature Fault Response ..37 Switching Frequency and Phase ...27 External Overtemperature and Undertemperature PWM Loop Compensation ...27 Fault Response ..38 Output Voltage Sensing ...27 Responses to Input Overcurrent and Output INTVCC/EXTVCC Power ..27 Undercurrent Faults ...38 Output Current Sensing and Sub Mil iohm DCR Responses to External Faults ...38 Current Sensing ...28 Fault Logging ...38 Input Current Sensing ..28 Bus Timeout Protection ...38 PolyPhase Load Sharing ..28 Similarity Between PMBus, SMBus and I2C External/Internal Temperature Sense ...29 2-Wire Interface ...39 RCONFIG (Resistor Configuration) Pins ...29 PMBus Serial Digital Interface ...39 VOUTn _CFG Pin Strapping Look-Up Table for the Abbreviations of Supported Data Formats ...40 LTM4678’s Output Voltage, Coarse Setting (Not Figure 7 to Figure 24 PMBus Protocols .. 41 Applicable if MFR_CONFIG_ALL[6] = 1b) ...29
PMBus Command Summary ..44
VTRIMn_CFG Pin Strapping Look-Up Table for the PMBus Commands ..44 LTM4678’s Output Voltage, Fine Adjustment Setting PMBus Commands Summary (Note: The Data (Not Applicable if MFR_CONFIG_ALL[6] = 1b) ..30 Format Abbreviations are Detailed in Table 8) ..44 Data Format Abbreviations ..49 Rev. A 2 For more information www.analog.com Document Outline Features Applications Typical Application Description Table of Contents 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 Overview, Major Features EEPROM with ECC Power-Up and Initialization Soft-Start Time-Based Sequencing Voltage-Based Sequencing Shutdown Light-Load Current Operation Switching Frequency and Phase PWM Loop Compensation Output Voltage Sensing INTVCC/EXTVCC Power Output Current Sensing and Sub Milliohm DCR Current Sensing Input Current Sensing PolyPhase Load Sharing External/Internal Temperature Sense RCONFIG (Resistor Configuration) Pins VOUTn _CFG Pin Strapping Look-Up Table for the LTM4678’s Output Voltage, Coarse Setting (Not Applicable if MFR_CONFIG_ALL[6] = 1b) VTRIMn_CFG Pin Strapping Look-Up Table for the LTM4678’s Output Voltage, Fine Adjustment Setting (Not Applicable if MFR_CONFIG_ALL[6] = 1b) FSWPH_CFG Pin Strapping Look-Up Table to Set the LTM4678’s Switching Frequency and Channel Phase-Interleaving Angle (Not Applicable if MFR_CONFIG_ALL[6] = 1b) ASEL Pin Strapping Look-Up Table to Set the LTM4678’s Slave Address (Applicable Regardless of MFR_CONFIG_ALL[6] Setting) LTM4678 MFR_ADDRESS Command Examples Expressed in 7- and 8-Bit Addressing Fault Detection and Handling Status Registers and ALERT Masking Mapping Faults to FAULT Pins Power Good Pins CRC Protection Serial Interface Communication Protection Device Addressing Responses to VOUT and IIN/IOUT Faults Output Overvoltage Fault Response Output Undervoltage Response Peak Output Overcurrent Fault Response Responses to Timing Faults Responses to VIN OV Faults Responses to OT/UT Faults Internal Overtemperature Fault Response External Overtemperature and Undertemperature Fault Response Responses to Input Overcurrent and Output Undercurrent Faults Responses to External Faults Fault Logging Bus Timeout Protection Similarity Between PMBus, SMBus and I2C 2-Wire Interface PMBus Serial Digital Interface Abbreviations of Supported Data Formats Figure 7 to Figure 24 PMBus Protocols PMBus Command Summary PMBus Commands PMBus Commands Summary (Note: The Data Format Abbreviations are Detailed in Table 8) Data Format Abbreviations Applications Information VIN to VOUT Step-Down Ratios Input Capacitors Output Capacitors Light Load Current Operation Switching Frequency and Phase Recommended Switching Frequency for Various VIN-to-VOUT Step-Down Scenarios Output Current Limit Programming 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 Input Current Sense Amplifier Programmable Loop Compensation Checking Transient Response PolyPhase Configuration Connecting The USB to I2C/SMBus/PMBus Controller to the LTM4678 In System LTpowerPlay: An Interactive GUI for Digital Power PMBus Communication and Command Processing Thermal Considerations and Output Current Derating Table 10 thru Table 11: Output Current Derating 0.9V Output 1.8V Output Channel Output Voltage vs Component Selection, 0A to 12.5A/μs Load Step Output Capacitor-GRM32ER60G337ME05L, 330μF, 4V, X5R, Murata Low VOUT Range for VOUT ≤ 2.5V High VOUT Range for 2.5V ≤ VOUT ILIMIT Range = High Channel Output Voltage vs Component Selection, 0A to 12.5A/μs Load Step Low VOUT Range for VOUT ≤ 2.5V High VOUT Range for 2.5V ≤ VOUT ILIMIT Range = High Dual Phase Single Output – Ceramic and Poscap Output Capacitors Applications Information-Derating Curves EMI Performance Safety Considerations Layout Checklist/Example Typical Applications PMBus Command Details Addressing and Write Protect General Configuration Commands On/Off/Margin PWM Configuration Voltage Input Voltage and Limits Output Voltage and Limits Output Current and Limits Input Current and Limits Temperature Power Stage DCR Temperature Calibration Timing Timing—On Sequence/Ramp Timing—Off Sequence/Ramp Precondition for Restart Fault Response Fault Responses All Faults Fault Responses Input Voltage Fault Responses Output Voltage VOUT_OV_FAULT_RESPONSE Data Byte Contents VOUT_UV_FAULT_RESPONSE Data Byte Contents Fault Responses Output Current OUT_OC_FAULT_RESPONSE Data Byte Contents Fault Responses IC Temperature Data Byte Contents MFR_OT_FAULT_RESPONSE Fault Responses External Temperature Fault Sharing Fault Sharing Propagation FAULTn Propagate Fault Configuration Fault Sharing Response Scratchpad Identification Fault Warning and Status Telemetry NVM Memory Commands Store/Restore Fault Logging Fault Logging Explanation of Position_Fault Values Block Memory Write/Read Package Description LTM4678 BGA Pinout Revision History Package Photograph Design Resources Related Parts
