Datasheet LTC3888-1 (Analog Devices) - 8

LTC3888-1
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Notes 2, 8). VIN = 12V, VSENSEn + = 1V, VSENSEn – = GND = 0V, fSYNC = 500kHz (externally driven) unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Digital Inputs (SCL, SDA, RUNn , FAULTn , SYNC, SHARE_CLOCK)
VIH Input High Voltage SCL, SDA, RUNn, FAULTn l 1.25 V SYNC, SHARE_CLK l 1.8 V VIL Input Low Voltage SCL, SDA, RUNn, FAULTn l 0.8 V SYNC, SHARE_CLK l 0.6 V VHYST Input Hysteresis SCL, SDA (Note 10) 65 mV IIN Input Leakage Current 0V ≤ SCL, SDA, RUN0, RUN1 ≤ 5.5V l –5 5 µA CIN Input Capacitance (Note 16) 10 pF tFILT Input Digital Filter Delay FAULTn 3 µs RUNn 10 µs
Digital Outputs (SCL, SDA, RUNn , FAULTn , SYNC, SHARE_CLOCK, ALERT, PWMn , PGOODn , CLKOUT)
VOL Output Low Voltage ISINK = 3mA: SDA, SCL, l 400 mV FAULTn, ALERT, SYNC, RUNn, SHARE_CLK ISINK = 2mA: PWMn, PGOODn, l 300 mV CLKOUT VOH Output High Voltage PWMn, ISOURCE = 2mA l 2.7 V ILKG Output Leakage Current 0V ≤ PWMn, PGOODn ≤ VDD33, l –2 2 µA 0V ≤ CLKOUT ≤ VDD33 l –2 2 µA 0V ≤ FAULTn, SYNC ≤ 3.6V, l –2 2 µA 0V ≤ SHARE_CLOCK ≤ 3.6V l –5 5 µA 0V ≤ RUNn, SCL, SDA, ALERT ≤ 5.5V l –5 5 µA tRO PWMn Output Rise Time CLOAD = 30pF, 10% to 90% 5 ns tFO PWMn Output Fall Time CLOAD = 30pF, 90% to 10% 4 ns
Serial Bus Timing
fSMB Serial Bus Operating Frequency l 10 400 kHz tBUF Bus Free Time Between Stop and l 1.3 µs Start tHD,STA Hold Time After (Repeated) l 0.6 µs Start Condition. 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 ns Transmitting Data l 0.3 0.9 µs tSU,DAT Input Data Setup Time l 100 ns tTIMEOUT Clock Low Time-Out l 25 35 ms tLOW Serial Clock Low Period l 1.3 10,000 µs tHIGH Serial Clock High Period l 0.6 µs tF Clock or Data Fall Time 90% to 10% l 20 300 ns tR Clock or Data Rise Time 10% to 90% l 20 300 ns Rev. 0 8 For more information www.analog.com 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