Datasheet LTC3888-1 (Analog Devices) - 9

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ELECTRICAL CHARACTERISTICS Note 1:
Absolute Maximum Ratings are given relative to GND, unless
Note 8:
All currents into device pins are positive; all currents out of device otherwise specified. Stresses beyond those listed under Absolute pins are negative. All voltages are referenced to GND unless otherwise Maximum Ratings may cause permanent damage to the device. Exposure specified. to any Absolute Maximum Rating condition for extended periods may
Note 9:
Specified accuracy requires Servo Mode to be set with MFR_ affect device reliability and lifetime. PWM_MODE_LTC3888-1 command bit 6. VOUT_COMMAND must be
Note 2:
The LTC3888-1 is tested under pulsed load conditions such that within ±5.5% of unadjusted VOUT. TJ ≈ TA. Junction temperature TJ is calculated in °C from the ambient
Note 10:
LTC3888-1 output voltage control is trimmed and measured in temperature TA and power dissipation PD according to the formula: TJ = a feedback loop that servos ITH to a specified value using a fixed external TA + (PD • θJA) where θJA is the package thermal impedance. Note that gain of 3.5. Output accuracy may be better than that of other loop- the maximum ambient temperature consistent with these specifications regulated voltages (DAOUT, VFB). Output accuracy without Servo Mode is determined by specific operating conditions in conjunction with board may degrade when external gain deviates from 3.5 in the application. layout, the rated package thermal impedance and other environmental
Note 11:
ADC tested with PWMs disabled. Comparable capability factors. Refer to the Applications Information section. demonstrated by in-circuit evaluations. Total unadjusted error includes all
Note 3:
This IC includes overtemperature protection that is intended to gain and linearity errors, as well as offsets. protect the device during momentary overload conditions. The maximum
Note 12:
Internal 32-bit calculations using 16-bit ADC results are limited to rated junction temperature will be exceeded when this protection is active. 10-bit mantissa resolution by PMBus linear 11-bit data format. Continuous operation above the specified absolute maximum operating junction temperature may impair device reliability or permanently damage
Note 13:
Limits guaranteed by TSNS voltage and current measurements the device. during test, including ADC read backs.
Note 4:
Do not apply a voltage source to INTV
Note 14:
Data conversion is done in round robin fashion. If all inputs CC unless shorted to VIN. Otherwise, connect only external passive components for LTC3888-1 signals are scanned, continuous in-sequence conversions result in a configuration. See Electrical Characteristics for applicable limits beyond typical latency of 90ms. which permanent damage may occur.
Note 15:
The EEPROM endurance, retention and mass write times are
Note 5:
An external voltage source may be connected directly to V guaranteed by design, characterization and correlation with statistical DD33 only if the device is not powered from V process controls. Minimum retention applies only for devices cycled less IN or INTVCC. Otherwise, connect only external passive components for LTC3888-1 configuration. See than the minimum endurance specification. EEPROM read commands Electrical Characteristics for applicable limits beyond which permanent (e.g. RESTORE_USER_ALL) are valid over the entire specified operating damage may occur. junction temperature range.
Note 6:
Do not apply a voltage source directly to these pins. See Electrical
Note 16:
Guaranteed by design. Characteristics for applicable limits beyond which permanent damage may occur.
Note 7:
Do not apply a voltage or current source directly to these pins. Connect only external passive components for LTC3888-1 configuration and application, otherwise permanent damage may occur. Rev. 0 For more information www.analog.com 9 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Test Circuit Operation Overview About This Document Major Product Features Main Control Loop Power-Up and Initialization Testing Integrity of Output Voltage Sense Analog Output Voltage Control PMBus Output Voltage Control Soft-Start Time-Based Output Sequencing Output Ramping Control Voltage-Based Output Sequencing Output Disable Minimum Output Disable Times Output Short Cycle Switching Frequency and Phase PolyPhase Load Sharing Voltage Control Loop Compensation Load Step Emulation Input Supply Monitoring Output Voltage Sensing and Monitoring Output Current Sensing and Monitoring Temperature Sense Resistor Configuration Pins Internal EEPROM with CRC Fault Detection Input Supply Faults Hardwired PWM Response to Power Stage Faults Hardwired PWM Response to Power Stage UV Hardwired PWM Response to VOUT Faults Power Good Indication Hardwired PWM Response to IOUT Faults Hardwired PWM Response to Internal Temperature Faults External Temperature Faults Timing Faults External Faults Higher-Level Fault Handling Status Registers and ALERT Masking FAULT Pin I/O Fault Log Operation Fault Log Details Factory Default Operation Serial Interface Serial Bus Addressing Serial Bus Timeout Serial Communication Errors PMBus Command Summary PMBus Commands Data Formats Applications Information Efficiency Considerations Power Stage Selection and Interface Using The VDR Monitor Unused TSNS Inputs PWM Frequency and Inductor Selection CIN Selection COUT Selection Programmable Loop Compensation PCB Layout Considerations Output Voltage Sensing Classical Analog Output Voltage Control PMBus Output Voltage Control Using Output Voltage Servo Soft-Start and Stop Time-Based Output Sequencing and Ramping Voltage-Based Output Sequencing PWM Frequency Synchronization PolyPhase Operation and Load Sharing Resistor Configuration Pins Internal Regulator Outputs IC Junction Temperature Derating EEPROM Retention at Temperature Configuring Open-Drain Pins PMBus Communication and Command Processing Status and Fault Log Management LTpowerPlay – An Interactive Digital Power GUI Interfacing to the DC1613 Design Example PMBus Command Details Addressing and Write Protect PAGE PAGE_PLUS_WRITE PAGE_PLUS_READ WRITE_PROTECT MFR_ADDRESS MFR_RAIL_ADDRESS General Device Configuration PMBUS_REVISION CAPABILITY MFR_CONFIG_ALL On, Off and Margin Control ON_OFF_CONFIG OPERATION MFR_RESET PWM Configuration FREQUENCY_SWITCH MFR_CHAN_CONFIG MFR_PWM_CONFIG_LTC3888-1 MFR_PWM_MODE_LTC3888-1 MFR_PWM_COMP Input Voltage and Limits VIN_ON VIN_OFF VIN_OV_FAULT_LIMIT VIN_UV_WARN_LIMIT Output Voltage and Limits VOUT_MODE VOUT_COMMAND VOUT_MAX MFR_VOUT_MAX VOUT_MARGIN_HIGH VOUT_MARGIN_LOW VOUT_SCALE_LOOP VOUT_OV_FAULT_LIMIT VOUT_OV_WARN_LIMIT VOUT_UV_WARN_LIMIT VOUT_UV_FAULT_LIMIT Output Current and Limits IOUT_CAL_GAIN MFR_LOAD_EMULATION MFR_LOAD_EMULATION IOUT_OC_FAULT_LIMIT IOUT_OC_WARN_LIMIT Output Timing, Delays, and Ramping MFR_RESTART_DELAY TON_DELAY TON_MAX_FAULT_LIMIT VOUT_TRANSITION_RATE TOFF_DELAY TOFF_MAX_WARN_LIMIT External Temperature and Limits MFR_TEMP_1_GAIN MFR_TEMP_1_OFFSET OT_FAULT_LIMIT OT_WARN_LIMIT Status Reporting STATUS_BYTE STATUS_WORD STATUS_VOUT STATUS_IOUT STATUS_INPUT STATUS_TEMPERATURE STATUS_CML STATUS_MFR_SPECIFIC MFR_PADS_LTC3888-1 MFR_COMMON MFR_INFO CLEAR_FAULTS Telemetry READ_VIN MFR_VIN_PEAK READ_VOUT MFR_VOUT_PEAK READ_IOUT MFR_IOUT_PEAK MFR_TOTAL_IOUT MFR_READ_ALL_IOUT READ_TEMPERATURE_1 MFR_TEMPERATURE_1_PEAK READ_TEMPERATURE_2 MFR_TEMPERATURE_2_PEAK READ_FREQUENCY MFR_CLEAR_PEAKS Fault Response and Communication VIN_OV_FAULT_RESPONSE VOUT_OV_FAULT_RESPONSE VOUT_UV_FAULT_RESPONSE IOUT_OC_FAULT_RESPONSE OT_FAULT_RESPONSE MFR_OT_FAULT_RESPONSE TON_MAX_FAULT_RESPONSE MFR_RETRY_DELAY SMBALERT_MASK MFR_FAULT_PROPAGATE MFR_FAULT_RESPONSE MFR_FAULT_LOG MFR_FAULT_LOG_CLEAR EEPROM User Access STORE_USER_ALL RESTORE_USER_ALL MFR_COMPARE_USER_ALL MFR_FAULT_LOG_STORE MFR_EE_xxxx USER_DATA_0x Unit Identification MFR_ID IC_DEVICE_ID MFR_SPECIAL_ID Package Description Typical Applications Related Parts