Datasheet LTC3883, LTC3883-1 (Analog Devices) - 3

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TABLE OF CONTENTS
Topside MOSFET Driver Supply (CB, DB) ..47 Input Current Calibration ...80 Undervoltage Lockout ...47 Input Current ..80 CIN and COUT Selection ...47 Temperature ..80 Fault Conditions ..48 External Temperature Calibration..80 Open-Drain Pins ...49 External Temperature Limits ...81 Phase-Locked Loop and Frequency Synchronization .. Timing ..82 49 Timing—On Sequence/Ramp ...82 Minimum On-Time Considerations..50 Timing—Off Sequence/Ramp ..83 Input Current Sense Amplifier ...50 Precondition for Restart ...83 RCONFIG (External Resistor Fault Response ...84 Configuration Pins) ... 51 Fault Responses Al Faults ..84 Voltage Selection .. 51 Fault Responses Input Voltage ...84 Frequency and Phase Selection Using RCONFIG 53 Fault Responses Output Voltage ...85 Address Selection Using RCONFIG ...53 Fault Responses Output Current ...87 Efficiency Considerations ...54 Fault Responses IC Temperature ..88 Checking Transient Response ...54 Fault Responses External Temperature ...89 PolyPhase Configuration ..55 Fault Sharing ...90 PC Board Layout Checklist ...56 Fault Sharing Propagation ..90 PC Board Layout Debugging ...58 Fault Sharing Response ..92 Design Example ..58 Scratchpad ...92 Connecting the USB to I2C/SMBus/PMBus Control er Identification ...92 to the LTC3883 In System ..60 Telemetry ..98 Inductor DCR Auto Calibration ...61 NVM Memory Commands .. 102 Accurate DCR Temperature Compensation ...62 Store/Restore ... 102 LTpowerPlay: An Interactive GUI for Digital Power .63 Fault Logging .. 104 PMBus Communication and Command Processing 64 Block Memory Write/Read.. 107
PMBus Command Details ...66 Typical Applications .. 109
Addressing and Write Protect ...66
Package Description ... 114
General Configuration COMMANDS ..67
Revision History .. 115
On/Off/Margin ..68
Typical Application ... 116
PWM Configuration ..70
Related Parts .. 116
Voltage ..72 Input Voltage and Limits ...72 Output Voltage and Limits ..73 Current ..76 Output Current Calibration ...76 Output Current ..78 Rev. F 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 Output Current Sensing Auto Calibration Accurate DCR Temperature Compensation Input 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 Input Overcurrent And Output Undercurrent Faults Responses to External Faults Fault Logging 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 Input Current Sense Amplifier RCONFIG (External Resistor Configuration Pins) Voltage Selection Frequency and Phase Selection Using RCONFIG Address Selection Using RCONFIG Efficiency Considerations Checking Transient Response PolyPhase Configuration PC Board Layout Checklist PC Board Layout Debugging Design Example Connecting the USB to I2C/SMBus/PMBus Controller to the LTC3883 In System Inductor DCR Auto Calibration Accurate DCR Temperature Compensation 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 PWM Configuration Voltage Input Voltage and Limits Output Voltage and Limits Current Output Current Calibration Output Current Input Current Calibration Input 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 Telemetry NVM Memory Commands Store/Restore Fault Logging Block Memory Write/Read Typical Applications Package Description Revision History Typical Application Related Parts