LTM4680 Dual 30A or Single 60A Module Regulator with Digital Power System Management FEATURES DESCRIPTION n Dual 30A or Single 60A Digitally Adjustable Analog The LTM 4680 is a dual 30A or single 60A step-down Loops with Digital Interface for Control and Monitoring Module (power module) DC/DC regulator featuring n Wide Input Voltage Range: 4.5V to 16V remote configurability and telemetry-monitoring of power n Output Voltage Range: 0.5V to 3.3V management parameters over PMBusan open stan- 2 n 90% Full Load Efficiency from 12V to 1V at 60A dard I C-based digital interface protocol. The LTM4680 IN OUT n 0.5% Maximum DC Output Error Over Temperature is comprised of digitally programmable analog control n 2.5% Current Readback Accuracy (25C to 125C) loops, precision mixed-signal circuitry, EEPROM, power n Integrated Input Current Sense Amplifier MOSFETs, inductors and supporting components. 2 n 400kHz PMBus-Compliant I C Serial Interface The LTM4680 product video is available on the website. n Supports Telemetry Polling Rates up to 125Hz n Constant Frequency Current Mode Control The LTM4680s 2-wire serial interface allows outputs n Parallel and Current Share Multiple Modules to be margined, tuned and ramped up and down at pro- n Pin Compatible with LTM4678 grammable slew rates with sequencing delay times. True n 16mm 16mm 7.82mm BGA Package input current sense, output currents and voltages, output Readable Data: power, temperatures, uptime and peak values are read- n Input and Output Voltages, Currents, and Temperatures able. Custom configuration of the EEPROM contents is not n Running Peak Values, Uptime, Faults and Warnings required. At start-up, output voltages, switching frequency, n Onboard EEPROM Fault Log Record and channel phase angle assignments can be set by pin- Writable Data and Configurable Parameters: strapping resistors. The LTpowerPlay GUI and DC1613 n Output Voltage, Voltage Sequencing and Margining USB-to-PMBus converter and demo kits are available. n Digital Soft-Start/Stop Ramp, Program Analog Loop The LTM4680 is offered in a 16mm 16mm 7.82mm n OV/UV/OT, UVLO, Frequency and Phasing BGA package available with SnPb or RoHS compliant ter- minalfinish. Pin compatible with LTM4678. APPLICATIONS All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. Patents including 5408150, 5481178, 5705919, 5929620, 6144194, 6177787, 6580258, n System Optimization, Characterization and Data Mining 7420359, 8163643. Licensed under U.S. Patent 7000125 and other related patents worldwide. in Prototype, Production and Field Environments Click to view associated Video Design Idea. TYPICAL APPLICATION Dual 30A Module Regulator with Digital Interface for Control and Monitoring* Efficiency vs Current at 12V Input 100 V OUT0 4.5V to 16V + ADJUSTABLE V (FROM OUT0 IN 95 UP TO 30A + 4.5V TO 5.75V, R V OSNS0 SENSE CONNECT 22F 100F LOAD0 90 IN V , SV IN IN 5 8 V AND INTV OSNS0 V CC IN1 85 V TOGETHER) OUT1 V IN0 V OUT1 ADJUSTABLE SV IN + V OSNS1 UP TO 30A 80 RUN1 LTM4680 100F LOAD1 ON/OFF CONTROL 8 RUN0 75 V OSNS1 FAULT0 FAULT INTERRUPTS 70 FAULT1 2 1.0V, 250kHz I C/SMBus I/F WITH PMBus SCL 1.5V, 425kHz SYNC COMMAND SET TO/FROM SDA 65 SYNCHRONIZATION TIME-BASE IPMI OR OTHER BOARD SHARE CLK 0 5 10 15 20 25 30 ALERT REGISTER WRITE PROTECTION MANAGEMENT CONTROLLER WP LOAD CURRENT (A) SGND GND 4680 TA01b 4680 TA01a *FOR COMPLETE CIRCUIT, SEE FIGURE 46 Rev. B 1 Document Feedback For more information www.analog.com EFFICIENCY (%)LTM4680 TABLE OF CONTENTS Features ..................................................... 1 Table3. FSWPH CFG Pin Strapping Look-Up Table Applications ................................................ 1 to Set the LTM4680s Switching Frequency and Typical Application ........................................ 1 Channel Phase-Interleaving Angle (Not Applicable Description.................................................. 1 if MFR CONFIG ALL 6 = 1b) ...........................32 Table of Contents .......................................... 2 Table4. ASEL Pin Strapping Look-Up Table to Absolute Maximum Ratings .............................. 4 Set the LTM4680s Slave Address (Applicable Order Information .......................................... 4 Regardless of MFR CONFIG ALL 6 Setting) ....33 Pin Configuration .......................................... 4 Table5. LTM4680 MFR ADDRESS Command Electrical Characteristics ................................. 5 Examples Expressed in 7- and 8-Bit Addressing .... 33 Typical Performance Characteristics .................. 12 Fault Detection and Handling .................................33 Pin Functions .............................................. 15 Status Registers and ALERT Masking ..................34 Simplified Block Diagram ............................... 19 Figure5. LTM4680 Status Register Summary ......35 Decoupling Requirements ............................... 19 Mapping Faults to FAULT Pins .............................36 Functional Diagram ...................................... 20 Power Good Pins .................................................36 Test Circuits ............................................... 21 CRC Protection ....................................................36 Operation................................................... 23 Serial Interface ......................................................36 Power Module Introduction ...................................23 Communication Protection ..................................36 Power Module Overview, Major Features ................23 Device Addressing .................................................36 EEPROM with ECC ................................................. 24 Responses to V and I /I Faults ..................37 OUT IN OUT Power-Up and Initialization ....................................25 Output Overvoltage Fault Response ....................37 Soft-Start ...............................................................26 Output Undervoltage Response ...........................38 Time-Based Sequencing ........................................26 Peak Output Overcurrent Fault Response ............38 Voltage-Based Sequencing ....................................26 Responses to Timing Faults ...................................38 Shutdown ..............................................................27 Responses to V OV Faults ...................................38 IN Light-Load Current Operation ................................27 Responses to OT/UT Faults ....................................38 Switching Frequency and Phase .............................28 Internal Overtemperature Fault Response ............38 PWM Loop Compensation .....................................28 External Overtemperature and Output Voltage Sensing .........................................28 UndertemperatureFaultResponse ....................39 INTV /EXTV Power ..........................................28 Responses to Input Overcurrent and Output CC CC Output Current Sensing and Sub Milliohm Undercurrent Faults ...............................................39 DCRCurrent Sensing .............................................29 Responses to External Faults .................................39 Input Current Sensing ............................................29 Fault Logging .........................................................39 PolyPhase Load Sharing ........................................29 Bus Timeout Protection .........................................39 2 External/Internal Temperature Sense .....................30 Similarity Between PMBus, SMBus and I C RCONFIG (Resistor Configuration) Pins .................30 2-WireInterface .....................................................40 Table1. VOUTn CFG Pin Strapping Look-Up Table for PMBus Serial Digital Interface ...............................40 the LTM4680s Output Voltage, Coarse Setting (Not Table6. Abbreviations of Supported Data Formats ...41 Applicable if MFR CONFIG ALL 6 = 1b) .............31 Figure6. PMBus Timing Diagram ......................... 41 Table2. VTRIMn CFG Pin Strapping Look-Up Figures 7 to 24 PMBus Protocols ...........................42 Table for the LTM4680s Output Voltage, Fine Adjustment Setting (Not Applicable if MFR CONFIG ALL 6 = 1b) ........................................31 Rev. B 2 For more information www.analog.com