Datasheet LTM4676A (Analog Devices)

link to page 26 LTM4676A Dual 13A or Single 26A µModule Regulator with Digital Power System Management
FeaTures DescripTion
n
Dual, Fast, Analog Loops with Digital Interface for
The LTM®4676A is a dual 13A or single 26A step-down
Control and Monitoring
µModule® (micromodule) DC/DC regulator with 40ms n
Wide Input Voltage Range: 4.5V to 26.5V
turn-on time. It features remote configurability and n
Output Voltage Range: 0.5V to 5.5V
telemetry-monitoring of power management parameters n
±0.5% Maximum DC Output Error Over Temperature
over PMBus— an open standard I2C-based digital interface n
±2.5% Current Readback Accuracy at 10A Load
protocol . The LTM4676A is comprised of fast analog n
400kHz PMBus-Compliant I2C Serial Interface
control loops, precision mixed-signal circuitry, EEPROM, n
Integrated 16-Bit
∆Σ
ADC
power MOSFETs, inductors and supporting components. n
Supports Telemetry Polling Rates Up to 125Hz
The LTM4676A’s 2-wire serial interface al ows outputs to 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 All 7-Bit Slave Addresses Supported output currents and voltages, output power, temperatures, n Pin-Compatible to Dual 18A LTM4677 uptime and peak values are readable. At start-up, output n 16mm × 16mm × 5.01mm BGA Package voltages, switching frequency, and channel phase angle
Readable Data:
assignments can be set by pin-strapping resistors. The n Input and Output Voltages, Currents, and Temperatures LTpowerPlay™ GUI and DC1613 USB-to-PMBus converter n Running Peak Values, Uptime, Faults and Warnings and demo kits are available. n Onboard EEPROM Fault Log Record with ECC The LTM4676A is pin-compatible and the improved
Writable Data and Configurable Parameters:
performance version of the LTM4676. n Output Voltage, Voltage Sequencing and Margining L, LT, LTC, LTM, Linear Technology, the Linear logo, µModule and PolyPhase are registered trademarks and LTpowerPlay is a trademark of Analog Devices, Inc. All other trademarks are n Digital Soft-Start/Stop Ramp the property of their respective owners. Protected by U.S. Patents including 5408150, 5481178, n OV/UV/OT, UVLO, Frequency and Phasing 5705919, 5929620, 6144194, 6177787, 6580258, 7420359, 8163643. Licensed under U.S. Patent 7000125 and other related patents worldwide.
applicaTions Click to view associated Video Design Idea.
n System Optimization, Characterization and Data Min- ing in Prototype, Production and Field Environments
Typical applicaTion Using PMBus and LTpowerPlay to Monitor Telemetry and Margin VOUT0/VOUT1 During Load Pattern Tests. 10Hz Polling Rate. 12VIN Dual 13A µModule Regulator with Digital 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 26.5V (V) (A) (A) 22µF V UP TO 13A IN1 V + (V) OSNS0 ×3 SV 0.9 1.7 I IN0 0.5 0.8 IN 100µF V OUT0 LOAD0 ×7 ON/OFF CONTROL RUN0 V – OSNS0 0.8 1.6 0 0 RUN1 V 0 3 6 9 12 0 3 6 9 12 LTM4676A OUT1, V TIME (SEC) 4676A TA01b TIME (SEC) 4676A TA01d OUT1 ADJUSTABLE FAULT INTERRUPTS, GPIO0 UP TO 13A POWER SEQUENCING V GPIO OSNS1 1
Output Current Readback, Varying Load Pattern Power Stage Temperature Readback
CHANNEL 1 TEMP (°C) 100µF LOAD1 15 15 60 60 PWM CLOCK AND ×7 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 4676A TA01a BOARD MANAGEMENT 0 3 6 9 12 CHANNEL 0 TEMP (°C) 0 3 6 9 12 CONTROLLER *FOR COMPLETE CIRCUIT, SEE FIGURE 69 TIME (SEC) 4676A TA01c TIME (SEC) 4676A TA01e 4676afa For more information www.linear.com/LTM4676A 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 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 LTM4676A 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