Datasheet LTC3880, LTC3880-1 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management |
| Pages / Page | 118 / 3 — TABLE OF CONTENTS. PMBus Command Details ...65. Typical Applications .. … |
| Revision | H |
| File Format / Size | PDF / 1.8 Mb |
| Document Language | English |
TABLE OF CONTENTS. PMBus Command Details ...65. Typical Applications .. 111. Package Description ... 116
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TABLE OF CONTENTS
RCONFIG (External Resistor Timing ..80 Configuration Pins) ... 51 Timing—On Sequence/Ramp ...80 Voltage Selection .. 51 Timing—Off Sequence/Ramp ..81 Frequency and Phase Selection Using RCONFIG 52 Precondition for Restart ...81 Address Selection Using RCONFIG ...53 Fault Response ...82 Efficiency Considerations ...54 Fault Responses Al Faults ..82 Checking Transient Response ...55 Fault Responses Input Voltage ...82 PC Board Layout Checklist ...56 Fault Responses Output Voltage ...83 PC Board Layout Debugging ...58 Fault Responses Output Current ...86 Design Example ..59 Fault Responses IC Temperature ..87 Connecting the USB to the I2C/SMBus/PMBus Fault Responses External Temperature ...88 Control er to the LTC3880 In System ..61 Fault Sharing ...89 LTpowerPlay: An Interactive GUI for Digital Power .62 Fault Sharing Propagation ..89 PMBus Communication and Command Processing 63 Fault Sharing Response ..91
PMBus Command Details ...65
Scratchpad ...91 Addressing and Write Protect ...65 Identification ...92 General Configuration Registers ...67 Fault Warning and Status ..93 On/Off/Margin ..68 Telemetry .. 100 PWM Config ...70 NVM Memory Commands .. 103 Voltage ..72 Store/Restore ... 103 Input Voltage and Limits ...72 Fault Log Operation .. 104 Output Voltage and Limits ..73 Fault Logging .. 104 Current ..76 Block Memory Write/Read.. 109 Input Current Calibration ...76
Typical Applications .. 111
Output Current Calibration ...76
Package Description ... 116
Input Current ..76
Revision History .. 117
Output Current ..77
Typical Application ... 118
Temperature ..78
Related Parts .. 118
External Temperature Calibration..78 External Temperature Limits ...79 Rev. H For more information www.analog.com 3 Document Outline Features Applications Typical Application Description Table of Contents Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Overview Main Control Loop EEPROM Power Up and Initialization Soft-Start Sequencing Voltage-Based Sequencing Shutdown Light Load Current Operation Switching Frequency and Phase Output Voltage Sensing Current Sensing Load Sharing External/Internal Temperature Sense RCONFIG (Resistor Configuration) Pins Fault Detection and Handling Internal Memory with CRC and ECC Serial Interface Communication Failure 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 Overtemperature Fault Response—Internal Overtemperature and Undertemperature Fault Response—Externals Responses to External Faults Bus Timeout Failure 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 Schottky Diode (Optional) 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 CIN and COUT Selection Fault Conditions Open-Drain Pins Phase-Locked Loop and Frequency Synchronization Minimum On-Time Considerations RCONFIG (External Resistor Configuration Pins) Voltage Selection Frequency and Phase Selection Using RCONFIG Address Selection Using RCONFIG Efficiency Considerations Checking Transient Response PC Board Layout Checklist PC Board Layout Debugging Design Example Connecting the USB to the I2C/SMBus/PMBus Controller to the LTC3880 In System LTpowerPlay: An Interactive GUI for Digital Power PMBus Communication and Command Processing PMBus Command Details Addressing and Write Protect General Configuration Registers On/Off/Margin PWM Config Voltage Input Voltage and Limits Output Voltage and Limits Current Input Current Calibration Output Current Calibration Input Current Output Current Temperature External Temperature Calibration External Temperature Limits 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 NVM Memory Commands Store/Restore Fault Log Operation Fault Logging Block Memory Write/Read Typical Applications Package Description Revision History Typical Application Related Parts
TABLE OF CONTENTS
RCONFIG (External Resistor Timing ..80 Configuration Pins) ... 51 Timing—On Sequence/Ramp ...80 Voltage Selection .. 51 Timing—Off Sequence/Ramp ..81 Frequency and Phase Selection Using RCONFIG 52 Precondition for Restart ...81 Address Selection Using RCONFIG ...53 Fault Response ...82 Efficiency Considerations ...54 Fault Responses Al Faults ..82 Checking Transient Response ...55 Fault Responses Input Voltage ...82 PC Board Layout Checklist ...56 Fault Responses Output Voltage ...83 PC Board Layout Debugging ...58 Fault Responses Output Current ...86 Design Example ..59 Fault Responses IC Temperature ..87 Connecting the USB to the I2C/SMBus/PMBus Fault Responses External Temperature ...88 Control er to the LTC3880 In System ..61 Fault Sharing ...89 LTpowerPlay: An Interactive GUI for Digital Power .62 Fault Sharing Propagation ..89 PMBus Communication and Command Processing 63 Fault Sharing Response ..91
PMBus Command Details ...65
Scratchpad ...91 Addressing and Write Protect ...65 Identification ...92 General Configuration Registers ...67 Fault Warning and Status ..93 On/Off/Margin ..68 Telemetry .. 100 PWM Config ...70 NVM Memory Commands .. 103 Voltage ..72 Store/Restore ... 103 Input Voltage and Limits ...72 Fault Log Operation .. 104 Output Voltage and Limits ..73 Fault Logging .. 104 Current ..76 Block Memory Write/Read.. 109 Input Current Calibration ...76
Typical Applications .. 111
Output Current Calibration ...76
Package Description ... 116
Input Current ..76
Revision History .. 117
Output Current ..77
Typical Application ... 118
Temperature ..78
Related Parts .. 118
External Temperature Calibration..78 External Temperature Limits ...79 Rev. H For more information www.analog.com 3 Document Outline Features Applications Typical Application Description Table of Contents Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Overview Main Control Loop EEPROM Power Up and Initialization Soft-Start Sequencing Voltage-Based Sequencing Shutdown Light Load Current Operation Switching Frequency and Phase Output Voltage Sensing Current Sensing Load Sharing External/Internal Temperature Sense RCONFIG (Resistor Configuration) Pins Fault Detection and Handling Internal Memory with CRC and ECC Serial Interface Communication Failure 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 Overtemperature Fault Response—Internal Overtemperature and Undertemperature Fault Response—Externals Responses to External Faults Bus Timeout Failure 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 Schottky Diode (Optional) 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 CIN and COUT Selection Fault Conditions Open-Drain Pins Phase-Locked Loop and Frequency Synchronization Minimum On-Time Considerations RCONFIG (External Resistor Configuration Pins) Voltage Selection Frequency and Phase Selection Using RCONFIG Address Selection Using RCONFIG Efficiency Considerations Checking Transient Response PC Board Layout Checklist PC Board Layout Debugging Design Example Connecting the USB to the I2C/SMBus/PMBus Controller to the LTC3880 In System LTpowerPlay: An Interactive GUI for Digital Power PMBus Communication and Command Processing PMBus Command Details Addressing and Write Protect General Configuration Registers On/Off/Margin PWM Config Voltage Input Voltage and Limits Output Voltage and Limits Current Input Current Calibration Output Current Calibration Input Current Output Current Temperature External Temperature Calibration External Temperature Limits 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 NVM Memory Commands Store/Restore Fault Log Operation Fault Logging Block Memory Write/Read Typical Applications Package Description Revision History Typical Application Related Parts
