Datasheet LTM4675 (Analog Devices) - 76

link to page 76 LTM4675
TYPICAL APPLICATIONS
IN OUT OPTIONAL: INSTALLING U2 AWAY FROM HEAT SOURCES U2 RSET1 ALLOWS INTVCC LDO LOSSES NORMALLY INCURRED BY LT3060 13.3k THE LTM4675 TO BE DISSIPATED INSTEAD BY THE LT3060. SHDN ADJ THERMAL-DERATING CAN THUS BE IMPROVED RSET2 GND REF/BYP 1.62k VIN V 0 1 V 5.75V to 17V + C IN0 V CC OUT0 V INH OUT, 5V C SW C INL TSNS OUT V 22µF IN1 V DD25 SW 0 ADJUSTABLE 220µF INT 100µF SV UP TO 18A ×3 IN ×10 V DD33 10k ×7 + SCL VORB0 LOAD SMBus INTERFACE WITH + SDA VOSNS0 PMBus COMMAND SET – ALERT U1 VOSNS0– RUN V 0 LTM4675 ON/OFF CONTROL, FAULT ORB0 RUN V 1 MANAGEMENT, POWER ORB1 GPIO V 0 SEQUENCING OUT1 GPIO TSNS 1 1a PWM CLOCK SYNCH. SYNC TSNS1b TIME BASE SYNCH. SHARE_CLK WP • SLAVE ADDRESS = 1000101_R/W (0X45) 0a 0b 1a 1b VOSNS1 • 1MHz SWITCHING FREQUENCY SGND COMP COMP COMP COMP F SWPHCFG ASEL V OUT0CFG V TRIM0CFG V OUT1CFG V TRIM1CFG GND • NO GUI CONFIGURATION AND NO 4675 F34 PART-SPECIFIC PROGRAMMING REQUIRED IN MULTI-MODULE SYSTEMS, CONFIGURING RAIL_ADDRESS IS RECOMMENDED. 4.22k 9.09k 16.2k 3.83k 1% 1% 1% 1% ±50ppm/°C • SETTING MFR_PWM_CONFIG[7]=1 ±50ppm/°C ±50ppm/°C ±50ppm/°C b, CONFIGURES THE VOUT1 CONTROL LOOP TO USE THE V + – OSNS0 /VOSNS0 DIFFERENTIAL- SENSE PIN-PAIR AS THE FEEDBACK SIGNAL FOR REGULATING VOUT1.
Figure 34. 18A, 5V Output DC/DC µModule Regulator with Serial Interface
18 16 14 12 400LFM, WITH U2, R 10 SET1 AND RSET2 INSTALLED: θJA = 7.9°C/W 0LFM, WITH U2, RSET1 AND RSET2 INSTALLED: θJA = 9.2°C/W 8 400LFM, WITH U2, RSET1 AND RSET2 NOT USED: θJA = 9.5°C/W 0LFM, WITH U2, RSET1 AND RSET2 NOT USED: θJA = 13°C/W 6 4 MAXIMUM LOAD CURRENT (A) 2 020 30 40 50 60 70 80 90 100 AMBIENT TEMPERATURE (°C) 4675 F35
Figure 35. Output Derating Curve of Figure 34 Circuit Tested on DC2053, 12VIN, No Heat Sink
Rev. C 76 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Simplified Block Diagram Decoupling Requirements Functional Diagram Test Circuits Operation Power Module Introduction Power Module Configurability and Readback Data Time-Averaged and Peak Readback Data Power Module Overview EEPROM Serial Interface Device Addressing Fault Detection and Handling Responses to VOUT and IOUT Faults Responses to Timing Faults Responses to SVIN OV Faults Responses to OT/UT Faults Responses to External Faults Fault Logging Bus Timeout Protection PMBus Command Summary PMBus Commands Applications Information VIN to VOUT Step-Down Ratios Input Capacitors Output Capacitors Light Load Current Operation Switching Frequency and Phase Minimum On-Time Considerations Variable Delay Time, Soft-Start and Output Voltage Ramping Digital Servo Mode Soft Off (Sequenced Off) Undervoltage Lockout Fault Detection and Handling Open-Drain Pins Phase-Locked Loop and Frequency Synchronization RCONFIG Pin-Straps (External Resistor Configuration Pins) Voltage Selection Connecting the USB to the I2C/SMBus/PMBus Controller to the LTM4675 In System LTpowerPlay: An Interactive GUI for Digital Power System Management PMBus Communication and Command Processing Thermal Considerations and Output Current Derating EMI Performance Safety Considerations Layout Checklist/Example Typical Applications Appendix A Similarity Between PMBus, SMBus and I2C 2-Wire Interface Appendix B PMBus Serial Digital Interface Appendix C: PMBus Command Details Addressing and Write Protect General Configuration Registers On/Off/Margin PWM Config Voltage Current Temperature Timing Fault Response Fault Sharing Scratchpad Identification Fault Warning and Status Telemetry NVM (EEPROM) Memory Commands Package Description Package Photograph Package Description Revision History Typical Application Design Resources Related Parts