Datasheet LTC3884, LTC3884-1 (Analog Devices) - 9

LTC3884/LTC3884-1
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, 3). VIN = 12V, EXTVCC = 0V, VRUN0,1 = 3.3V, fSYNC = 500kHz (externally driven) and all programmable parameters at factory default, unless otherwise specified. SYMBOL PARAMETER CONDITION MIN TYP MAX UNITS
VIN_THR VIN Threshold to Enable EXTVCC VIN Rising 7 V Switchover VIN_THF VIN Threshold to Disable EXTVCC VIN Falling 6.5 V Switchover
VDD33 Regulator
VDD33 Internal VDD33 Voltage 4.5V < VINTVCC or 4.8V < VEXTVCC 3.2 3.3 3.4 V ILIM VDD33 Current Limit VDD33 = GND, VIN = INTVCC = 4.5V 100 mA VDD33_OV VDD33 Overvoltage Threshold 3.5 V VDD33_UV VDD33 Undervoltage Threshold 3.1 V
VDD25 Regulator
VDD25 Internal VDD25 Voltage 2.5 V ILIM VDD25 Current Limit VDD25 = GND, VIN = INTVCC = 4.5V 80 mA
Oscillator and Phase-Locked Loop
fRANGE PLL SYNC Range Syncronized with Falling Edge of SYNC l 200 1000 kHz fOSC Oscillator Frequency Accuracy Frequency Switch = 250.0 to 1000.0 kHz l ±7.5 % VTH(SYNC) SYNC Input Threshold VSYNC Falling 1 V VSYNC Rising 1.5 V VOL(SYNC) SYNC Low Output Voltage ILOAD = 3mA 0.2 0.4 V ILEAK(SYNC) SYNC Leakage Current in Slave Mode 0V ≤ VPIN ≤ 3.6V ±5 µA θSYNC-θ0 SYNC to Ch0 Phase Relationship MFR_PWM_CONFIG[2:0] = 0,2,3 0 Deg Based on the Falling Edge of Sync MFR_PWM_CONFIG[2:0] = 5 60 Deg and Rising Edge of TG0 MFR_PWM_CONFIG[2:0] = 1 90 Deg MFR_PWM_CONFIG[2:0]= 4,6 120 Deg θSYNC-θ1 SYNC to Ch1 Phase Relationship MFR_PWM_CONFIG[2:0] = 3 120 Deg Based on the Falling Edge of Sync MFR_PWM_CONFIG[2:0] = 0 180 Deg and Rising Edge of TG1 MFR_PWM_CONFIG[2:0] = 2,4,5 240 Deg MFR_PWM_CONFIG[2:0] = 1 270 Deg MFR_PWM_CONFIG[2:0] = 6 300 Deg
EEPROM Characteristics
Endurance (Note 12) 0°C < TJ < 85°C EEPROM Write Operations l 10,000 Cycles Retention (Note 12) TJ < 125°C l 10 Years Mass_Write Mass Write Operation Time STORE_USER_ALL, 0°C < TJ < 85°C l 440 4100 ms During EEPROM Write Operation
Leakage Current SDA, SCL, ALERT, RUN
IOL Input Leakage Current OV ≤ VPIN ≤ 5.5V l ±5 µA
Leakage Current FAULTn , PGOODn
IGL Input Leakage Current OV ≤ VPIN ≤ 3.6V l ±2 µA
Digital Inputs SCL, SDA, RUNn , GPI0n
VIH Input High Threshold Voltage l 1.35 V VIL Input Low Threshold Voltage 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 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 Time-Based Sequencing Voltage-Based Sequencing Shutdown Light-Load Current Operation Switching Frequency and Phase PWM Loop Compensation Output Voltage Sensing INTVCC/EXTVCC Power Output Current Sensing and Sub Milliohm DCR Current Sensing Input Current Sensing PolyPhase Load Sharing External/Internal Temperature Sense RCONFIG (Resistor Configuration) Pins Fault Detection and Handling Status Registers and ALERT Masking Mapping Faults to FAULT Pins Power Good Pins CRC Protection and ECC Serial Interface Communication Protection Device Addressing Responses to VOUT, IIN 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 Response External Overtemperature and Undertemperature Fault Response Responses to Input Overcurrent and Output Undercurrent Faults 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 *Data Format Applications Information Current Limit Programming ISENSE0± and ISENSE1± Pins Inductor DCR Sensing Inductor Value Calculation Inductor Core Selection Low Value Resistor Current Sensing Slope Compensation and Inductor Peak Current Power MOSFET and Optional Schottky Diode Selection Variable Delay Time, Soft-Start and Output Voltage Ramping Digital Servo Mode Soft Off (Sequenced Off) INTVCC/EXTVCC Power Topside MOSFET Driver Supply (CB, DB) Undervoltage Lockout CIN and COUT Selection Fault Indication Open-Drain Pins Phase-Locked Loop and Frequency Synchronization Minimum On-Time Considerations External Temperature Sense 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 Master Slave Operation PC Board Layout Checklist PC Board Layout Debugging Design Example Additional Design Checks Connecting the USB to I2C/SMBus/PMBus Controller to the LTC3884 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 NVM Memory Commands Store/Restore Fault Log Operation Fault Logging Block Memory Write/Read Typical Applications Package Description Revision History Typical Application Related Parts