Datasheet LTM4675 (Analog Devices)

link to page 25 LTM4675 Dual 9A or Single 18A µModule Regulator with Digital Power System Management
FeaTures DescripTion
n
Dual, Fast, Analog Loops with Digital Interface for
The LTM®4675 is a dual 9A or single 18A step-down
Control and Monitoring
µModule® (micromodule) DC/DC regulator with 40ms n
Wide Input Voltage Range: 4.5V to 17V
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 9A Load
protocol . The LTM4675 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 LTM4675’s 2-wire serial interface allows outputs to be n
Constant Frequency Current Mode Control
margined, tuned and ramped up and down at programmable n
Parallel and Current Share Multiple Modules
slew rates with sequencing delay times. Input and output n All 7-Bit Slave Addresses Supported currents and voltages, output power, temperatures, uptime n Drop-In Pin-Compatible to Dual 13A LTM4676A and and peak values are readable. Custom configuration of Dual 18A LTM4677 the EEPROM contents is not required. At start-up, output n 16mm × 11.9mm × 3.51mm BGA Package voltages, switching frequency, and channel phase angle
Readable Data:
assignments can be set by pin-strapping resistors. The n LTpowerPlay™ GUI and DC1613 USB-to-PMBus converter Input and Output Voltages, Currents, and Temperatures n and demo kits are available. Running Peak Values, Uptime, Faults and Warnings n Onboard EEPROM Fault Log Record with ECC The LTM4675 is offered in a 16mm × 11.9mm × 3.51mm
Writable Data and Configurable Parameters:
BGA package available with SnPb or RoHS compliant n terminal finish. Output Voltage, Voltage Sequencing and Margining n Digital Soft-Start/Stop Ramp L, LT, LTC, LTM, Linear Technology, the Linear logo, µModule and PolyPhase are registered trademarks and LTpowerPlay is a trademark of Linear Technology Corporation. All other n OV/UV/OT, UVLO, Frequency and Phasing trademarks are the property of their respective owners. Protected by U.S. Patents including 5408150, 5481178, 5705919, 5929620, 6144194, 6177787, 6580258, 7420359, 8163643.
applicaTions
Licensed under U.S. Patent 7000125 and other related patents worldwide.
Click to view associated Video Design Idea.
n System Optimization in Prototype and Production
Typical applicaTion Using PMBus and LTpowerPlay to Monitor Telemetry and Margin V Dual 9A 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 1.0 2.0 V V OUT0, V IN V OUT1 I IN0 VOUT0 ADJUSTABLE 1.0 1.8 IN1 5.75V TO 17V (V) (A) (A) 22µF V UP TO 9A IN1 0.5 1.0 V + (V) OSNS0 ×2 SV 0.9 1.7 I IN0 IN 100µF V OUT0 LOAD0 ×4 ON/OFF CONTROL RUN0 V – OSNS0 0.8 1.6 0 0 RUN1 V 0 3 6 9 12 0 3 6 9 12 LTM4675 OUT1, V TIME (s) 4675 TA01b TIME (s) 4675 TA01d OUT1 ADJUSTABLE FAULT INTERRUPTS, GPIO0 UP TO 9A POWER SEQUENCING V GPIO OSNS1 1
Output Current Readback, Varying Load Pattern Power Stage Temperature Readback
CHANNEL 1 TEMP (°C) 100µF LOAD1 10 10 60 60 PWM CLOCK AND ×4 SYNC SGND I TIME-BASE OUT1 SHARE_CLK 57 57 SYNCHRONIZATION (A) 5 5 SCL (A) I2C/SMBus I/F WITH SDA 54 54 REGISTER WRITE PMBus COMMAND SET I OUT0 WP PROTECTION GND ALERT TO/FROM IPMI OR OTHER 0 0 51 51 4675 TA01a BOARD MANAGEMENT 0 3 6 9 12 CHANNEL 0 TEMP (°C) 0 3 6 9 12 CONTROLLER *FOR COMPLETE CIRCUIT, SEE FIGURE 61 TIME (s) 4675 TA01c TIME (SEC) 4675 TA01e 4675fb For more information www.linear.com/LTM4675 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 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