Datasheet LTC3887, LTC3887-1, LTC3887-2 (Analog Devices) - 4

link to page 40 LTC3887/LTC3887-1/ LTC3887-2
ABSOLUTE MAXIMUM RATINGS (Note 1)
V + IN Voltage ... –0.3V to 28V VSENSE0 , VSENSE1, ISENSE0n, ISENSE1n .. –0.3V to 6V VIN Voltage LTC3887-2 ... –0.3V to 36V RUN0, RUN1, SDA, SCL, ALERT .. –0.3V to 5.5V Top Gate Transient Voltage TG0, FREQ_CFG, VOUTn_CFG, ASEL0/1, VDD25 ..–0.3V to 2.75V TG1 LTC3887 .. –5V to 34V V – DD33, GPIO0, GPIO1, TSNS0, TSNS1, VSENSE0 , Top Gate Transient Voltage PWM0, SHARE_CLK, WP, SYNC, ITHn ... –0.3V to 3.6V PWM1 LTC3887-1 .. –0.3V to 6V INTVCC Peak Output Current ..100mA BOOST1, BOOST0, LTC3887 .. –0.3V to 34V Operating Junction Temperature Range BOOST1, BOOST0, LTC3887-2 ... –0.3V to 42V (Note 2) .. –40°C to 125°C* VCC1, VCC0 LTC3887-1 .. –0.3V to 6V Storage Temperature Range .. –65°C to 150°C* Switch Transient Voltage SW1, *See Derating EEPROM Retention at Temperature in the SW0 LTC3887 ... –5V to 28V Applications Information section for junction tempera- INTVCC, EXTVCC, (BOOST1 – SW1), (BOOST0 – SW0), tures in excess of 125°C. BG0, BG1, LTC3887, LTC3887-2 ... –0.3V to 6V
PIN CONFIGURATION
LTC3887/LTC3887-2 LTC3887-1 *) V CC TOP VIEW TOP VIEW (EXT V CC V CC TSNS0 SW0 TG0 BOOST0 BG0 V IN GND INT BG1 BOOST1 TSNS0 NC PWM0 V CC0 NC V IN GND INT NC V CC1 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 PWM1 V – – SENSE0 2 29 SW1 VSENSE0 2 29 NC 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 ISENSE0+ 6 GND 25 V GND DD33 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 PHAS_CFG SDA 10 21 PHAS_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 ASEL0 ASEL1 ALER GPIO0 GPIO1 RUN0 RUN1 ASEL0 ASEL1 V OUT0_CFG V OUT1_CFG FREQ_CFG V OUT0_CFG V OUT1_CFG FREQ_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 GND, MUST BE SOLDERED TO PCB EXPOSED PAD (PIN 41) IS GND, MUST BE SOLDERED TO PCB *EXTVCC FOR LTC3887-2 ONLY Rev.F 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 (NVM) Power Up and Initialization Soft-Start Sequencing EVENT-Based Sequencing Shutdown Light Load Current Operation Switching Frequency and Phase Output Voltage Sensing Current Sensing PolyPhase Load Sharing External/Internal Temperature Sense RCONFIG (Resistor Configuration) Pins Fault Detection and Handling Internal EEPROM with CRC Protection and ECC 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 *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) (LTC3887, LTC3887-2) 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 Additional Design Checks Connecting the USB to the I2C/SMBus/PMBus Controller to the LTC3887 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 (EEPROM) Memory Commands Store/Restore Fault Logging Block Memory Write/Read Typical Applications Package Description Revision History Typical Application Related Parts