Datasheet LTC3886, LTC3886-1 (Analog Devices) - 3
| 制造商 | Analog Devices |
| 描述 | 60V Dual Output Step-Down Controller with Digital Power System Management |
| 页数 / 页 | 122 / 3 — TABLE OF CONTENTS. PMBus Command Details ...69. Typical Applications .. … |
| 修订版 | F |
| 文件格式/大小 | PDF / 2.6 Mb |
| 文件语言 | 英语 |
TABLE OF CONTENTS. PMBus Command Details ...69. Typical Applications .. 117. Package Description ... 120
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TABLE OF CONTENTS
Open-Drain Pins ... 51 Output Current and Limits ..82 Phase-Locked Loop and Frequency Input Current and Limits ..84 Synchronization .. 51 Temperature ..85 Minimum On-Time Considerations..52 External Temperature Calibration..85 External Temperature Sense ...52 Timing ..86 Derating EEPROM Retention at Temperature ..53 Timing—On Sequence/Ramp ...86 Input Current Sense Amplifier ...54 Timing—Off Sequence/Ramp ..87 External Resistor Configuration Pins (RCONFIG) ..54 Precondition for Restart ...88 Voltage Selection ..54 Fault Response ...88 Frequency Selection ..55 Fault Responses Al Faults ..88 Phase Selection ..56 Fault Responses Input Voltage ...89 Address Selection Using RCONFIG ...56 Fault Responses Output Voltage ...89 Efficiency Considerations ...56 Fault Responses Output Current ...92 Programmable Loop Compensation ...57 Fault Responses IC Temperature ..93 Checking Transient Response ...58 Fault Responses External Temperature ...94 PolyPhase Configuration ..59 Fault Sharing ...95 PC Board Layout Checklist ...59 Fault Sharing Propagation ..95 PC Board Layout Debugging ...62 Fault Sharing Response ..97 Design Example ..63 Scratchpad ...97 Additional Design Checks ...65 Identification ...98 Connecting the USB to I2C/SMBus/PMBus Fault Warning and Status ..99 Adapter to the LTC3886 In System ...65 Telemetry .. 106 LTpowerPlay: An Interactive GUI for Digital Power .66 EEPROM Memory Commands .. 110 PMBus Communication and Command Processing 67 Store/Restore ... 110
PMBus Command Details ...69
Fault Logging ...111 Addressing and Write Protect ...69 Fault Log Operation ...111 General Configuration COMMANDS ..71 Block Memory Write/Read.. 116 On/Off/Margin ..72
Typical Applications .. 117
ON_OFF_CONFIG ..73
Package Description ... 120
PWM Configuration .. 74
Revision History .. 121
Voltage ..78
Typical Application ... 122
Input Voltage and Limits ...78
Related Parts .. 122
Output Voltage and Limits ..79 For EnableMfrVoffThreshold = 0...81 For EnableMfrVoffThreshold = 1...82 Rev F For more information www.analog.com 3 Document Outline Table of Contents Features Power Conversion Applications Typical Application Description Table of Contents Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Overview Main Control Loop EEPROM Power-Up and Initialization Soft-Start Time-Based Sequencing Event-Based Sequencing Shutdown Light-Load Current Operation PWM Loop Compensation Switching Frequency and Phase Output Voltage Sensing Output Current Sensing Input Current Sensing PolyPhase Load Sharing External/Internal Temperature Sense RCONFIG (Resistor Configuration) Pins Fault 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 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/Warn Response External Overtemperature and Undertemperature Fault Response Responses to External Faults Fault Logging Bus Timeout Protection Similarity Between PMBus, SMBus and I2C 2-Wire Interface PMBus Serial Digital Interface PMBus Command Summary PMBus Commands *Data Format Applications Information Current Limit Programming ISENSE+ and ISENSE– Pins Low Value Resistor Current Sensing Inductor DCR Current Sensing Slope Compensation and Inductor Peak Current Inductor Value Calculation Inductor Core Selection Power MOSFET and Optional Schottky Diode Selection CIN and COUT Selection Variable Delay Time, Soft-Start and Output Voltage Ramping Digital Servo Mode Soft Off (Sequenced Off) INTVCC Regulator Topside MOSFET Driver Supply (CB, DB) Undervoltage Lockout Fault Indications Open-Drain Pins Phase-Locked Loop and Frequency Synchronization Minimum On-Time Considerations External Temperature Sense Derating EEPROM Retention at Temperature Input Current Sense Amplifier External Resistor Configuration Pins (RCONFIG) Voltage Selection Frequency Selection Phase Selection Address Selection Using RCONFIG Efficiency Considerations Programmable Loop Compensation Checking Transient Response PolyPhase Configuration PC Board Layout Checklist PC Board Layout Debugging Design Example Additional Design Checks Connecting the USB to I2C/SMBus/PMBus Adapter to the LTC3886 In System LTpowerPlay: An Interactive GUI for Digital Power PMBus Communication and Command Processing PMBus Command Details Addressing and Write Protect General Configuration COMMANDS On/Off/Margin ON_OFF_CONFIG PWM Configuration Voltage Input Voltage and Limits Output Voltage and Limits For EnableMfrVoffThreshold = 0 For EnableMfrVoffThreshold = 1 Output Current and Limits Input Current and Limits Temperature External 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 Fault Responses Output Current Fault Responses IC Temperature Fault Responses External Temperature Fault Sharing Fault Sharing Propagation Fault Sharing Response Scratchpad Identification Fault Warning and Status Telemetry EEPROM Memory Commands Store/Restore Fault Logging Fault Log Operation Block Memory Write/Read Typical Applications Package Description Revision History Typical Application Related Parts
TABLE OF CONTENTS
Open-Drain Pins ... 51 Output Current and Limits ..82 Phase-Locked Loop and Frequency Input Current and Limits ..84 Synchronization .. 51 Temperature ..85 Minimum On-Time Considerations..52 External Temperature Calibration..85 External Temperature Sense ...52 Timing ..86 Derating EEPROM Retention at Temperature ..53 Timing—On Sequence/Ramp ...86 Input Current Sense Amplifier ...54 Timing—Off Sequence/Ramp ..87 External Resistor Configuration Pins (RCONFIG) ..54 Precondition for Restart ...88 Voltage Selection ..54 Fault Response ...88 Frequency Selection ..55 Fault Responses Al Faults ..88 Phase Selection ..56 Fault Responses Input Voltage ...89 Address Selection Using RCONFIG ...56 Fault Responses Output Voltage ...89 Efficiency Considerations ...56 Fault Responses Output Current ...92 Programmable Loop Compensation ...57 Fault Responses IC Temperature ..93 Checking Transient Response ...58 Fault Responses External Temperature ...94 PolyPhase Configuration ..59 Fault Sharing ...95 PC Board Layout Checklist ...59 Fault Sharing Propagation ..95 PC Board Layout Debugging ...62 Fault Sharing Response ..97 Design Example ..63 Scratchpad ...97 Additional Design Checks ...65 Identification ...98 Connecting the USB to I2C/SMBus/PMBus Fault Warning and Status ..99 Adapter to the LTC3886 In System ...65 Telemetry .. 106 LTpowerPlay: An Interactive GUI for Digital Power .66 EEPROM Memory Commands .. 110 PMBus Communication and Command Processing 67 Store/Restore ... 110
PMBus Command Details ...69
Fault Logging ...111 Addressing and Write Protect ...69 Fault Log Operation ...111 General Configuration COMMANDS ..71 Block Memory Write/Read.. 116 On/Off/Margin ..72
Typical Applications .. 117
ON_OFF_CONFIG ..73
Package Description ... 120
PWM Configuration .. 74
Revision History .. 121
Voltage ..78
Typical Application ... 122
Input Voltage and Limits ...78
Related Parts .. 122
Output Voltage and Limits ..79 For EnableMfrVoffThreshold = 0...81 For EnableMfrVoffThreshold = 1...82 Rev F For more information www.analog.com 3 Document Outline Table of Contents Features Power Conversion Applications Typical Application Description Table of Contents Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Overview Main Control Loop EEPROM Power-Up and Initialization Soft-Start Time-Based Sequencing Event-Based Sequencing Shutdown Light-Load Current Operation PWM Loop Compensation Switching Frequency and Phase Output Voltage Sensing Output Current Sensing Input Current Sensing PolyPhase Load Sharing External/Internal Temperature Sense RCONFIG (Resistor Configuration) Pins Fault 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 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/Warn Response External Overtemperature and Undertemperature Fault Response Responses to External Faults Fault Logging Bus Timeout Protection Similarity Between PMBus, SMBus and I2C 2-Wire Interface PMBus Serial Digital Interface PMBus Command Summary PMBus Commands *Data Format Applications Information Current Limit Programming ISENSE+ and ISENSE– Pins Low Value Resistor Current Sensing Inductor DCR Current Sensing Slope Compensation and Inductor Peak Current Inductor Value Calculation Inductor Core Selection Power MOSFET and Optional Schottky Diode Selection CIN and COUT Selection Variable Delay Time, Soft-Start and Output Voltage Ramping Digital Servo Mode Soft Off (Sequenced Off) INTVCC Regulator Topside MOSFET Driver Supply (CB, DB) Undervoltage Lockout Fault Indications Open-Drain Pins Phase-Locked Loop and Frequency Synchronization Minimum On-Time Considerations External Temperature Sense Derating EEPROM Retention at Temperature Input Current Sense Amplifier External Resistor Configuration Pins (RCONFIG) Voltage Selection Frequency Selection Phase Selection Address Selection Using RCONFIG Efficiency Considerations Programmable Loop Compensation Checking Transient Response PolyPhase Configuration PC Board Layout Checklist PC Board Layout Debugging Design Example Additional Design Checks Connecting the USB to I2C/SMBus/PMBus Adapter to the LTC3886 In System LTpowerPlay: An Interactive GUI for Digital Power PMBus Communication and Command Processing PMBus Command Details Addressing and Write Protect General Configuration COMMANDS On/Off/Margin ON_OFF_CONFIG PWM Configuration Voltage Input Voltage and Limits Output Voltage and Limits For EnableMfrVoffThreshold = 0 For EnableMfrVoffThreshold = 1 Output Current and Limits Input Current and Limits Temperature External 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 Fault Responses Output Current Fault Responses IC Temperature Fault Responses External Temperature Fault Sharing Fault Sharing Propagation Fault Sharing Response Scratchpad Identification Fault Warning and Status Telemetry EEPROM Memory Commands Store/Restore Fault Logging Fault Log Operation Block Memory Write/Read Typical Applications Package Description Revision History Typical Application Related Parts