Datasheet LTM4677 (Analog Devices)

link to page 28 LTM4677 Dual 18A or Single 36A µModule Regulator with Digital Power System Management
FeaTures DescripTion
n
Dual, Fast, Analog Loops with Digital Interface
The LTM®4677 is a dual 18A or single 36A step-down
for Control and Monitoring
µModule® (power module) DC/DC regulator with 40ms n
Wide Input Voltage Range: 4.5V to 16V
turn-on time. It features remote configurability and n
Output Voltage Range: 0.5V to 1.8V
telemetry-monitoring of power management parameters n
±0.5% Maximum DC Output Error Over Temperature
over PMBus— an open standard I2C-based digital inter- n
±2.5% Current Readback Accuracy
face protocol. The LTM4677 is comprised of fast analog n
Pin Compatible with LTM4676A (Dual 13A, Single 26A)
control loops, precision mixed-signal circuitry, EEPROM, n
400kHz PMBus-Compliant I2C Serial Interface
power MOSFETs, inductors and supporting components. n
Supports Telemetry Polling Rates up to 125Hz
n The LTM4677’s 2-wire serial interface allows outputs to be
Integrated 16-Bit
∆Σ
ADC
n margined, tuned and ramped up and down at programmable
Constant Frequency Current Mode Control
n slew rates with sequencing delay times. Input and output
Parallel and Current Share Multiple Modules
n currents and voltages, output power, temperatures, uptime 16mm × 16mm × 5.01mm BGA Package and peak values are readable. Custom configuration of
Readable Data:
the EEPROM contents is not required. At start-up, output n Input and Output Voltages, Currents, and Temperatures voltages, switching frequency, and channel phase angle n Running Peak Values, Uptime, Faults and Warnings assignments can be set by pin-strapping resistors. The n Onboard EEPROM Fault Log Record with ECC LTpowerPlay™ GUI and DC1613 USB-to-PMBus converter
Writable Data and Configurable Parameters:
and demo kits are available. n Output Voltage, Voltage Sequencing and Margining n The LTM4677 is pin compatible with the LTM4676A (dual Digital Soft-Start/Stop Ramp n 13A) and is offered in a 16mm × 16mm × 5.01mm BGA pack- OV/UV/OT, UVLO, Frequency and Phasing age available with SnPb or RoHS compliant terminal finish.
applicaTions
L, LT, LTC, LTM, Linear Technology, the Linear logo, µModule, Burst Mode and PolyPhase are registered trademarks and LTpowerPlay is a trademark of Linear Technology Corporation. n System Optimization, Characterization and Data Min- All other trademarks are the property of their respective owners. Protected by U.S. Patents ing in Prototype, Production and Field Environments including 5408150, 5481178, 5705919, 5929620, 6144194, 6177787, 6580258, 7420359, 8163643. Licensed under U.S. Patent 7000125 and other related patents worldwide. n Telecom, Datacom, and Storage Systems
Typical applicaTion Using PMBus and LTpowerPlay to Monitor Telemetry and Margin V Dual 18A µModule Regulator with Digital OUT0/VOUT1 During Load Pattern Tests. 10Hz Polling Rate. 12VIN Interface for Control and Monitoring* Output Voltage Readback, VOUT Margined 7.5% Low Input Current Readback
1.1 1.9 1.5 2.4 V V OUT0, V IN V OUT1 I IN0 VOUT0 ADJUSTABLE 1.0 1.8 1.0 IN1 1.6 5.75V TO 16V (V) 22µF V UP TO 18A (A) (A) IN1 + (V) ×4 VOSNS0 100µF SV 0.9 1.7 I IN0 0.5 0.8 IN V OUT0 LOAD0 ×6 ON/OFF CONTROL RUN0 V – OSNS0 0.8 1.6 0 0 RUN1 V 0 3 6 9 12 0 3 6 9 12 LTM4677 OUT1, V TIME (SEC) 4677 TA01b TIME (SEC) 4677 TA01d OUT1 ADJUSTABLE FAULT INTERRUPTS, GPIO0 UP TO 18A POWER SEQUENCING V GPIO OSNS1 1 100µF
Output Current Readback, Varying Load Pattern Power Stage Temperature Readback
CHANNEL 1 TEMP (°C) LOAD1 ×6 15 15 60 60 PWM CLOCK AND SYNC SGND I TIME-BASE OUT1 SHARE_CLK 10 10 57 57 SYNCHRONIZATION (A) SCL (A) I2C/SMBus I/F WITH SDA I OUT0 5 5 54 54 REGISTER WRITE PMBus COMMAND SET WP PROTECTION GND ALERT TO/FROM IPMI OR OTHER 0 0 51 51 4677 TA01a BOARD MANAGEMENT 0 3 6 9 12 CHANNEL 0 TEMP (°C) 0 3 6 9 12 CONTROLLER *FOR COMPLETE CIRCUIT, SEE FIGURE 56 TIME (SEC) 4677 TA01c TIME (SEC) 4677 TA01e 4677fa For more information www.linear.com/LTM4677 1 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 LTM4677 In System PMBus Communication and Command Processing Thermal Considerations and Output Current Derating Applications Information-Derating Curves 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 Revision History Typical Application Design Resources Related Parts