Datasheet LTC3883, LTC3883-1 (Analog Devices) - 8

LTC3883/LTC3883-1
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TJ = 25°C (Note 2). VIN = 12V, VRUN = 3.3V, fSYNC = 500kHz (externally driven) unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
SYNC- SYNC to Channel Phase Relationship Based MFR_PWM_CONFIG_LTC3883[2:0] = 0 0 Deg on the Falling Edge of Sync and Rising Edge MFR_PWM_CONFIG_LTC3883[2:0] = 1 90 Deg of TG MFR_PWM_CONFIG_LTC3883[2:0] = 2 180 Deg MFR_PWM_CONFIG_LTC3883[2:0] = 3 270 Deg MFR_PWM_CONFIG_LTC3883[2:0] = 4 60 Deg MFR_PWM_CONFIG_LTC3883[2:0] = 5 120 Deg MFR_PWM_CONFIG_LTC3883[2:0] = 6 240 Deg MFR_PWM_CONFIG_LTC3883[2:0] = 7 300 Deg
EEPROM Characteristics
Endurance (Note 13) 0°C < TJ < 85°C During EEPROM Write l 10,000 Cycles Operations Retention (Note 13) TJ < 125°C l 10 Years Mass_Write Mass Write Operation Time STORE_USER_ALL, 0°C < TJ ≤ 85°C l 440 4100 ms During EEPROM Write Operations
Digital Inputs SCL, SDA, RUN, GPIO
VIH Input High Threshold Voltage SCL, SDA, RUN, GPIO l 1.35 V VIL Input Low Threshold Voltage SCL, SDA, RUN, GPIO l 0.8 V VHYST Input Hysteresis SCL, SDA 0.08 V CPIN Input Capacitance 10 pF
Digital Input WP
IPUWP Input Pull-Up Current WP 10 µA
Open-Drain Outputs SCL, SDA, GPIO, ALERT, RUN, SHARE_CLK
,
PGOOD
VOL Output Low Voltage ISINK = 3mA l 0.4 V
Digital Inputs SHARE_CLK, WP
VIH Input High Threshold Voltage l 1.5 1.8 V VIL Input Low Threshold Voltage l 0.6 1.0 V
Leakage Current SDA, SCL, ALERT, RUN
IOL Input Leakage Current 0V ≤ VPIN ≤ 5.5V l ±5 µA
Leakage Current GPIO
,
PGOOD
IGL Input Leakage Current 0V ≤ VPIN ≤ 3.6V l ±2 µA
Digital Filtering of GPIO
IFLTG Input Digital Filtering GPIO 3 µs
Digital Filtering of RUN
IFLTG Input Digital Filtering RUN 10 µs
PMBus Interface Timing Characteristics
fSCL Serial Bus Operating Frequency l 10 400 kHz tBUF Bus Free Time Between Stop and Start l 1.3 µs tHD,STA Hold time After Repeated Start Condition. l 0.6 µs After this Period, the First Clock is Generated tSU,STA Repeated Start Condition Setup Time l 0.6 µs tSU,STO Stop Condition Setup Time l 0.6 µs tHD,DAT Data Hold Time Receiving Data l 0 µs Transmitting Data l 0.3 0.9 µs Rev. F 8 For more information www.analog.com 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