Datasheet LTC3889 (Analog Devices) - 8

LTC3889
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 = 16V, EXTVCC = 0V, VRUN0 = 1.8V, VRUN1 = 1.8V fSYNC = 250kHz (externally driven), and all programmable parameters at factory default unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VTH(SYNC) SYNC Input Threshold VCLKIN Falling 1 V VCLKIN Rising 1.5 V VOL(SYNC) SYNC Low Output Voltage ILOAD = 2.5mA l 0.2 0.4 V ILEAK(SYNC SYNC Leakage Current in Slave Mode 0V ≤ VPIN ≤ 3.6V ±5 µA θSYNC-θ0 SYNC to Channel 0 Phase Relationship MFR_PWM_CONFIG_LTC3889[2:0] = 0,2,3 0 Deg Based on the Falling Edge of Sync and MFR_PWM_CONFIG_LTC3889[2:0] = 5 60 Deg Rising Edge of TG0 MFR_PWM_CONFIG_LTC3889[2:0] = 1 90 Deg MFR_PWM_CONFIG_LTC3889[2:0] = 4,6 120 Deg θSYNC-θ1 SYNC to Channel 1 Phase Relationship MFR_PWM_CONFIG_LTC3889[2:0] = 3 120 Deg Based on the Falling Edge of Sync and MFR_PWM_CONFIG_LTC3889[2:0] = 0 180 Deg Rising Edge of TG1 MFR_PWM_CONFIG_LTC3889[2:0] = 2,4,5 240 Deg MFR_PWM_CONFIG_LTC3889[2:0] = 1 270 Deg MFR_PWM_CONFIG_LTC3889[2:0] = 6 300 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 During l 440 4100 ms EEPROM Write Operations
Digital Inputs SCL, SDA, RUNn , FAULTn
VIH Input High Threshold Voltage SCL, SDA, RUN, FAULT l 1.35 V VIL Input Low Threshold Voltage SCL, SDA, RUN, FAULT 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, FAULTn , ALERT, RUNn , SHARE_CLK
,
PGOODn
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 FAULTn
,
PGOODn
IGL Input Leakage Current 0V ≤ VPIN ≤ 3.6V l ±2 µA
Digital Filtering of FAULTn
tFAULT Input Digital Filtering FAULTn 3 µs
Digital Filtering of PGOODn
tPGOOD Output Digital Filtering PG00Dn 60 µs
Digital Filtering of RUNn
tRUN Input Digital Filtering RUNn 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 Start Condition. After This l 0.6 µs Period, the First Clock Is Generated Rev. 0 8 For more information www.analog.com Document Outline Table of Contents Features Applications Typical Application Description Table of Contents Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Overview Main Control Loop EEPROM CRC Protection Power-Up and Initialization Soft-Start Time-Based Sequencing Event-Based Sequencing Shutdown Light-Load Current Operation PWM Loop Compensation Switching Frequency and Phase Output Voltage Sensing Output Current Sensing Input Current Sensing PolyPhase Load Sharing External/Internal Temperature Sense RCONFIG (Resistor Configuration) Pins Fault Handling Status Registers and ALERT Masking Mapping Faults to FAULT Pins Power Good Pins Serial Interface Communication Protection 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 Internal Overtemperature Fault/Warn Response External Overtemperature and Undertemperature Fault Response Responses to External Faults Fault Logging Bus Timeout Protection Similarity Between PMBus, SMBus and I2C 2-Wire Interface PMBus Serial Digital Interface PMBus Command Summary PMBus Commands 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 Optional Schottky Diode Selection CIN and COUT Selection Variable Delay Time, Soft-Start and Output Voltage Ramping Digital Servo Mode Soft Off (Sequenced Off) DRVCC Regulator Topside MOSFET Driver Supply (CB, DB) Undervoltage Lockout Fault Indications Open-Drain Pins Phase-Locked Loop and Frequency Synchronization Minimum On-Time Considerations External Temperature Sense Derating EEPROM Retention at Temperature Input Current Sense Amplifier External Resistor Configuration Pins (RCONFIG) Voltage Selection Frequency Selection Phase Selection Address Selection Using RCONFIG Efficiency Considerations Programmable Loop Compensation Checking Transient Response PolyPhase Configuration PC Board Layout Checklist PC Board Layout Debugging Design Example Additional Design Checks Connecting the USB to I2C/SMBus/PMBus Adapter to the LTC3889 In System 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 Output Current and Limits Input Current and Limits Temperature External Temperature Calibration 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 EEPROM Memory Commands Store/Restore Fault Logging Fault Log Operation Block Memory Write/Read Typical Applications Package Description Typical Application Related Parts