Datasheet LTC3880, LTC3880-1 (Analog Devices) - 4

LTC3880/LTC3880-1
ABSOLUTE MAXIMUM RATINGS (Note 1)
VIN Voltage ... –0.3V to 28V FREQ_CFG, VOUTn_CFG, VTRIMn_CFG, Topside Driver Voltages ASEL, VDD25 .. –0.3V to 2.75V BOOST1, BOOST0 .. –0.3V to 34V V – DD33, GPIO0, GPIO1, TSNS0, TSNS1, VSENSE0 , Switch Voltage (SW1, SW0) .. –5V to 28V SHARE_CLK, WP, SYNC, ITHn ... –0.3V to 3.6V EXTVCC, INTVCC, (BOOST1 – SW1), INTVCC Peak Output Current ..100mA (BOOST0 – SW0) ... –0.3V to 6V Operating Junction Temperature Range V + SENSE0 , VSENSE1, ISENSE0n, ISENSE1n .. –0.3V to 6V (Note 2) .. –40°C to 125°C* RUN0, RUN1, SDA, SCL, ALERT .. –0.3V to 5.5V Storage Temperature Range .. –65°C to 150°C* *See Derating EEPROM Retention at Temperature in Applications Informa- tion section for junction temperatures in excess of 125°C.
PIN CONFIGURATION
LTC3880 LTC3880-1 TOP VIEW TOP VIEW V CC V CC TSNS0 SW0 TG0 BOOST0 BG0 V IN PGND INT BG1 BOOST1 TSNS0 SW0 TG0 BOOST0 BG0 V IN PGND EXT BG1 BOOST1 40 39 38 37 36 35 34 33 32 31 40 39 38 37 36 35 34 33 32 31 VSENSE0+ 1 30 TG1 VSENSE0+ 1 30 TG1 V – – SENSE0 2 29 SW1 VSENSE0 2 29 SW1 I + + SENSE1 3 28 TSNS1 ISENSE1 3 28 TSNS1 I – – SENSE1 4 27 VSENSE1 ISENSE1 4 27 VSENSE1 ITH0 5 41 26 ITH1 ITH0 5 41 26 ITH1 SGND I SGND SENSE0+ 6 25 VDD33 ISENSE0+ 6 25 VDD33 I – – SENSE0 7 24 SHARE_CLK ISENSE0 7 24 SHARE_CLK SYNC 8 23 WP SYNC 8 23 WP SCL 9 22 VDD25 SCL 9 22 VDD25 SDA 10 21 VTRIM1_CFG SDA 10 21 VTRIM1_CFG 11 12 13 14 15 16 17 18 19 20 11 12 13 14 15 16 17 18 19 20 T T ALER GPIO0 GPIO1 RUN0 RUN1 ASEL ALER GPIO0 GPIO1 RUN0 RUN1 ASEL FREQ_CFG V OUT0_CFG V OUT1_CFG V TRIM0_CFG FREQ_CFG V OUT0_CFG V OUT1_CFG V TRIM0_CFG UJ PACKAGE UJ PACKAGE 40-LEAD (6mm × 6mm) PLASTIC QFN 40-LEAD (6mm × 6mm) PLASTIC QFN TJMAX = 125°C, θJA = 33°C/W, θJC = 2.5°C/W TJMAX = 125°C, θJA = 33°C/W, θJC = 2.5°C/W EXPOSED PAD (PIN 41) IS SGND, MUST BE SOLDERED TO PCB EXPOSED PAD (PIN 41) IS SGND, MUST BE SOLDERED TO PCB
ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION JUNCTION TEMPERATURE RANGE
LTC3880EUJ#PBF LTC3880EUJ#TRPBF LTC3880UJ 40-Lead (6mm × 6mm) Plastic QFN –40°C to 105°C LTC3880IUJ#PBF LTC3880IUJ#TRPBF LTC3880UJ 40-Lead (6mm × 6mm) Plastic QFN –40°C to 125°C LTC3880EUJ-1#PBF LTC3880EUJ-1#TRPBF LTC3880UJ-1 40-Lead (6mm × 6mm) Plastic QFN –40°C to 105°C LTC3880IUJ-1#PBF LTC3880IUJ-1#TRPBF LTC3880UJ-1 40-Lead (6mm × 6mm) Plastic QFN –40°C to 125°C Rev. H 4 For more information www.analog.com 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