Datasheet LTC3880, LTC3880-1 (Analog Devices) - 10

LTC3880/LTC3880-1
ELECTRICAL CHARACTERISTICS 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 90ms. Maximum Rating condition for extended periods may affect device
Note 7:
The IOUT_CAL_GAIN = 1.0mΩ and MFR_IOUT_CAL_GAIN_TC = reliability and lifetime. 0.0. Value as read from READ_IOUT in amperes.
Note 2:
The LTC3880/LTC3880-1 are tested under pulsed load conditions
Note 8:
Part tested with PWM disabled. Evaluation in application such that TJ ≈ TA. The LTC3880E/LTC3880E-1 are guaranteed to meet demonstrates capability. TUE (%) = ADC Gain Error (%) + 100 • [Zero performance specifications from 0°C to 85°C. Specifications over the Code Offset + ADC Linearity Error]/Actual Value. –40°C to 105°C operating junction temperature range are assured by
Note 9:
All V design, characterization and correlation with statistical process controls. OUT commands assume the ADC is used to auto-zero the output to achieve the stated accuracy. LTC3880 is tested in a feedback The LTC3880I/LTC388I-1 are guaranteed over the full –40°C to 125°C loop that servos V operating junction temperature range. T OUT to a specified value. J is calculated from the ambient temperature T
Note 10:
The maximum VOUT voltage is 5.5V. A and power dissipation PD according to the following formula:
Note 11:
The maximum VIN voltage is 28V. T
Note 12:
When V J = TA + (PD • θJA) IN < 6V, INTVCC must be tied to VIN. The maximum ambient temperature consistent with these specifications
Note 13:
EEPROM endurance and retention are guaranteed by design, is determined by specific operating conditions in conjunction with board characterization and correlation with statistical process controls. The layout, the rated package thermal impedance and other environmental minimum retention specification applies for devices whose EEPROM factors. has been cycled less than the minimum endurance specification. The
Note 3:
All currents into device pins are positive; all currents out of device RESTORE_USER_ALL command (NVM read) is valid over the entire pins are negative. All voltages are referenced to ground unless otherwise operating junction temperature range. specified.
Note 14:
The LTC3880-1 quiescent current (IQ) equals the IQ of VIN plus
Note 4:
Rise and fall times are measured using 10% and 90% levels. Delay the IQ of EXTVCC. times are measured using 50% levels.
Note 15:
Guaranteed with a common mode voltage (VOUT) between 0V
Note 5:
The data format in PMBus is 5 bits exponent (signed) and 11 bits and 5.5V. mantissa (signed). This limits the output resolution to 10 bits though the internal ADC is 16 bits and the calculations use 32-bit words. Rev. H 10 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 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