Datasheet LTC3883, LTC3883-1 (Analog Devices) - 9

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
tSU,DAT Data Setup Time Receiving Data l 0.1 µs tTIMEOUT_SMB Stuck PMBus Timer Non-Block Reads Measured from the Last PMBus Start Event 32 ms Stuck PMBus Timer Block Reads 150 ms tLOW Serial Clock Low Period l 1.3 10000 µs tHIGH Serial Clock High Period l 0.6 µs
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 6:
The data conversion is done in round robin fashion. All inputs may cause permanent damage to the device. Exposure to any Absolute signals are continuously converted for a typical latency of 80ms. Maximum Rating condition for extended periods may affect device
Note 7:
The IOUT_CAL_GAIN = 1.0mΩ and MFR_IOUT_TC = 0.0. Value as reliability and lifetime. read from READ_IOUT in amperes.
Note 2:
The LTC3883/LTC3883-1 are tested under pulsed load conditions
Note 8:
Part tested with PWM disabled. Evaluation in application such that TJ ≈ TA. The LTC3883E/LTC3883E-1 are guaranteed to meet demonstrates capability. TUE (%) = ADC Gain Error (%) + 100 • performance specifications from 0°C to 85°C. Specifications over the [Zero Code Offset + ADC Linearity Error]/Actual Value. –40°C to 105°C operating junction temperature range are assured by design,
Note 9:
All V characterization and correlation with statistical process controls. The OUT commands assume the ADC is used to auto-zero the output to achieve the stated accuracy. LTC3883 is tested in a feedback LTC3883I/LTC3883I-1 are guaranteed over the full –40°C to 125°C operating loop that servos V junction temperature range. T OUT to a specified value. J is calculated from the ambient temperature, T
Note 10:
The maximum V A, and power dissipation, PD, according to the following formula: OUT voltage is 5.5V. T
Note 11:
The maximum V J = TA + (PD • θJA) IN voltage is 28V. The maximum ambient temperature consistent with these specifications
Note 12:
When VIN < 6V, INTVCC must be tied to VIN. is determined by specific operating conditions in conjunction with board
Note 13:
EEPROM endurance is guaranteed by design, characterization layout, the rated package thermal impedance and other environmental and correlation with statistical process controls. Data retention is factors. production tested via a high temperature bake at wafer level. The minimum
Note 3:
All currents into device pins are positive; all currents out of device retention specification applies for devices whose EEPROM has been cycled pins are negative. All voltages are referenced to ground unless otherwise less than the minimum endurance specification. The RESTORE_USER_ALL specified. command (NVM read) is valid over the entire operating temperature range.
Note 4:
Rise and fall times are measured using 10% and 90% levels. Delay
Note 14:
The LTC3883-1 quiescent current (IQ) equals the IQ of VIN plus times are measured using 50% levels. the IQ of EXTVCC.
Note 5:
The data format in PMBus is 5 bits exponent (signed) and 11 bits
Note 15:
The LTC3883 includes overtemperature protection that is mantissa (signed). This limits the output resolution to 10 bits though the intended to protect the device during momentary overload conditions. internal ADC is 16 bits and the calculations use 32-bit words. Junction temperature will exceed 125°C when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature may impair device reliability. Rev. F For more information www.analog.com 9 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