Datasheet LTC3880, LTC3880-1 (Analog Devices) - 5

LTC3880/LTC3880-1
ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION JUNCTION TEMPERATURE RANGE AUTOMOTIVE PRODUCTS**
LTC3880EUJ#WPBF LTC3880EUJ#WTRPBF LTC3880UJ 40-Lead (6mm × 6mm) Plastic QFN –40°C to 105°C LTC3880IUJ#WPBF LTC3880IUJ#WTRPBF LTC3880UJ 40-Lead (6mm × 6mm) Plastic QFN –40°C to 125°C LTC3880EUJ-1#WPBF LTC3880EUJ-1#WTRPBF LTC3880UJ-1 40-Lead (6mm × 6mm) Plastic QFN –40°C to 105°C LTC3880IUJ-1#WPBF LTC3880IUJ-1#WTRPBF LTC3880UJ-1 40-Lead (6mm × 6mm) Plastic QFN –40°C to 125°C Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
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Versions of this part are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. These models are designated with a #W suffix. Only the automotive grade products shown are available for use in automotive applications. Contact your local Analog Devices account representative for specific product ordering information and to obtain the specific Automotive Reliability reports for these models.
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C. (Note 2) VIN = 12V, VRUN0,1 = 3.3V, fSYNC = 500kHz (externally driven) unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Input Voltage
VIN Input Voltage Range (Note 12) l 4.5 24 V IQ Input Voltage Supply Current (Note 14) Normal Operation VRUN0,1 = 3.3V, No Caps on TG and BG 25 mA VRUN0,1 = 0V 20 mA VUVLO Undervoltage Lockout Threshold VINTVCC/VEXTVCC Falling 3.7 V when VIN > 4.3V VINTVCC/VEXTVCC Rising 3.95 V tINIT Initialization Time Time from VIN Applied Until the TON_DELAY 120 ms Timer Starts
Control Loop
VOUT1R0 Full-Scale Voltage Range 0 VOUT_COMMAND(1) = 5.500V (Note 9) l 5.4 5.6 V Set Point Accuracy (0.6V to 5V) l –0.5 0.5 % Resolution 12 Bits LSB Step Size 1.375 mV VOUT1R1 Full-Scale Voltage Range 1 VOUT_COMMAND(1) = 2.75V (Note 9) l 2.7 2.8 V Set Point Accuracy (0.6V to 2.5V) l –0.5 0.5 % Resolution 12 Bits LSB Step Size 0.6875 mV VOUT0R0 Full-Scale Voltage Range 0 VOUT_COMMAND(0) = 4.095V (Note 9) l 4.0 4.2 V Set Point Accuracy (0.6V to 4.096V) l –0.5 0.5 % Resolution 12 Bits LSB Step Size 1.375 mV VOUT0R1 Full-Scale Voltage Range 1 VOUT_COMMAND(0) = 2.75V (Note 9) l 2.7 2.8 V Set Point Accuracy (0.6V to 2.5V) l –0.5 0.5 % Resolution 12 Bits LSB Step Size 0.6875 mV VLINEREG Line Regulation 6V < VIN < 24V l ±0.02 %/V VLOADREG Load Regulation ∆VITH = 1.35V – 0.7V l 0.01 0.1 % ∆VITH = 1.35V – 2.0V l –0.01 –0.1 % Rev. H For more information www.analog.com 5 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