Datasheet LTM4700 (Analog Devices)

LTM4700 Dual 50A or Single 100A µModule Regulator with Digital Power System Management
FEATURES DESCRIPTION
n Dual 50A or Single 100A Digitally Adjustable Outputs with The LTM®4700 is a dual 50A or single 100A step-down Digital Interface for Control, Compensation and Monitoring µModule® (power module) DC/DC regulator featuring n Wide Input Voltage: 4.5V to 16V remote configurability and telemetry-monitoring of power n Output Voltage Range: 0.5V to 1.8V management parameters over PMBus— an open standard n ~90% Full Load Efficiency from 12VIN to 1VOUT at 100A I2C-based digital interface protocol. The LTM4700 is n ±0.5% Maximum DC Output Error Over Temperature comprised of fast analog control loops, precision mixed- n ±3% Current Readback Accuracy (25°C to 125°C) signal circuitry, EEPROM, power MOSFETs, inductors and n Integrated Input Current Sense Amplifier supporting components. The LTM4700 product video is n 400kHz PMBus-Compliant I2C Serial Interface available on website. n Supports Telemetry Polling Rates Up to 125Hz The LTM4700’s 2-wire serial interface allows outputs to n Integrated 16-Bit ∆Σ ADC n Constant Frequency Current Mode Control be margined, tuned and ramped up and down at program- n Parallel and Current Share Multiple Modules mable slew rates with sequencing delay times. Input and n 15mm × 22mm × 7.87mm BGA Package output currents and voltages, output power, temperatures,
Readable Data:
uptime and peak values are readable. Custom configura- n Input and Output Voltages, Currents, and Temperatures tion of the EEPROM contents is not required. At start-up, n Running Peak Values, Uptime, Faults and Warnings output voltages, switching frequency, and channel phase n Internal EEPROM and Fault Logging with ECC angle as-signments can be set by pin-strapping resistors.
Writable Data and Configurable Parameters:
The LTpowerPlay® GUI and DC1613 USB-to-PMBus con- n Output Voltage, Voltage Sequencing and Margining verter and demo kits are available. n Digital Soft-Start/Stop Ramp The LTM4700 is offered in a 15mm × 22mm × 7.87mm n Optimize Analog Loop Compensation BGA package available with SnPb or RoHS compliant n OV/UV/OT, UVLO, Frequency and Phasing terminal finish.
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 Min- 7420359, 8163643. Licensed under U.S. Patent 7000125 and other related patents worldwide. ing in Prototype, Production and Field Environments
Click to view associated Video Design Idea.
n Telecom, Datacom, and Storage Systems
TYPICAL APPLICATION Efficiency vs Current at 12V Input Dual 50A µModule Regulator with Digital Interface
100
for Control and Monitoring*
VOUT0, V 95 IN ADJUSTABLE VIN0 V 5.75V TO 16V OUT0 22µF UP TO 50A VIN1 V + ×8 OSNS0 220µF 90 SVIN LOAD0 ×8 – ON/OFF CONTROL RUN0 VOSNS0 RUN 85 1 VOUT1, LTM4700 ADJUSTABLE VOUT1 EFFICIENCY (%) FAULT INTERRUPTS, UP TO 50A FAULT0 80 V + POWER SEQUENCING OSNS1 FAULT1 220µF V – OSNS1 LOAD1 ×8 75 PWM CLOCK AND 1.5V SYNC SGND OUT TIME-BASE 1.0V SHARE_CLK OUT SYNCHRONIZATION 70 SCL I2C/SMBus I/F WITH 0 10 20 30 40 50 SDA REGISTER WRITE PMBus COMMAND SET WP LOAD CURRENT (A) PROTECTION GND ALERT TO/FROM IPMI OR OTHER BOARD 4700 TA01b 4700 TA01a MANAGEMENT CONTROLLER *FOR COMPLETE CIRCUIT, SEE FIGURE 46 Rev 0 Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Table of Contents Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Simplified Block Diagram Decoupling Requirements Functional Diagram Test Circuits Operation PMBus Command Summary Applications Information Applications Information-Derating Curves Typical Applications PMBus Command Details Package Description Typical Applications Package Photograph Related Parts Features Applications Typical Application Description Table of Contents 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 Overview, Major Features EEPROM with ECC Power-Up and Initialization Soft-Start Time-Based Sequencing Voltage-Based Sequencing Shutdown Light-Load Current Operation Switching Frequency and Phase PWM Loop Compensation Output Voltage Sensing INTVCC and Build-in 5V Bias Converter Output Current Sensing and Sub Milliohm DCR Current Sensing Input Current Sensing PolyPhase Load Sharing External/Internal Temperature Sense RCONFIG (Resistor Configuration) Pins Fault Detection and Handling Status Registers and ALERT Masking Mapping Faults to FAULT Pins Power Good Pins CRC Protection Serial Interface Communication Protection Device Addressing Responses to VOUT and IIN/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 Response External Overtemperature and Undertemperature Fault Response Responses to Input Overcurrent and Output Undercurrent Faults Responses to External Faults Fault Logging Bus Timeout Protection Similarity Between PMBus, SMBus and I2C 2-Wire Interface PMBus Serial Digital Interface Figures 7 to 24 PMBus Protocols 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 Output Current Limit Programming 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 Input Current Sense Amplifier Programmable Loop Compensation Checking Transient Response PolyPhase Configuration Connecting The USB to I2C/SMBus/PMBus Controller to the LTM4700 In System LTpowerPlay: An Interactive GUI for Digital Power PMBus Communication and Command Processing Thermal Considerations and Output Current Derating Applications Information-Derating Curves EMI Performance Safety Considerations Layout Checklist/Example Typical Applications PMBus Command Details Addressing and Write Protect General Configuration Commands On/Off/Margin PWM Configuration Voltage Input Voltage and Limits Output Voltage and Limits Output Current and Limits Input Current and Limits Temperature External Temperature Calibration 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 Logging Block Memory Write/Read Package Description Typical Applications Package Photograph Related Parts