Datasheet LTM4677 (Analog Devices) - 6

link to page 132 link to page 132 LTM4677
elecTrical characTerisTics The
l
denotes the specifications which apply over the specified internal operating temperature range (Note 2). Specified as each individual output channel (Note 4). TA = 25°C, VIN = 12V, RUNn = 5V, FREQUENCY_SWITCH = 500kHz and VOUTn commanded to 1.000V unless otherwise noted. Configured with factory-default EEPROM settings and per Test Circuit 1, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
tDELAY(0ms) Turn-On Delay Time Time from First Rising Edge of RUNn to Rising Edge of GPIOn. l 2.75 3.1 3.5 ms TON_DELAYn = 0ms, TON_RISEn = 3ms, MFR_GPIO_PROPAGATEn = 0x0100, MFR_GPIO_RESPONSEn = 0x0000. VIN Having Been Established for at Least 40ms ∆VOUTn(LS) Peak Output Voltage Load: 0A to 9A and 9A to 0A at 9A/µs, Figure 56 Circuit, 50 mV Deviation for Dynamic VOUTn = 1V, VIN = 12V (Note 12) Load Step tSETTLE Settling Time for Load: 0A to 9A and 9A to 0A at 9A/µs, Figure 56 Circuit, 35 µs Dynamic Load Step VOUTn = 1V, VIN = 12V (Note 12) IOUTn(OCL_PK) Output Current Limit, Cycle-by-Cycle Inductor Peak Current Limit Inception 25 A Peak IOUTn(OCL_AVG) Output Current Limit, Time-Averaged Output Inductor Current Limit Inception Threshold, 20A; See IO-RB-ACC Time Averaged Commanded by IOUT_OC_FAULT_LIMITn (Note 12) Specification (Output Current Readback Accuracy)
Control Section
V – FBCM0 Channel 0 Feedback Input VOSNS0 Valid Input Range (Referred to SGND) l –0.1 0.3 V Common Mode Range V + OSNS0 Valid Input Range (Referred to SGND) l 2.1 V VFBCM1 Channel 1 Feedback Input SGND Valid Input Range (Referred to GND) l –0.3 0.3 V Common Mode Range VOSNS1 Valid Input Range (Referred to SGND) l 2.1 V VOUT-RNG1 Full-Scale Command (Notes 7, 15) Voltage, Range 1 VOUTn Commanded to 2.750V, MFR_PWM_MODEn[1] = 1b 2.711 2.788 V Resolution 12 Bits LSB Step Size 0.6875 mV R + + + VSENSE0 VOSNS0 Impedance to 0.05V ≤ VVOSNS0 – VSGND ≤ 1.8V 41 kΩ SGND RVSENSE1 VOSNS1 Impedance to 0.05V ≤ VVOSNS1 – VSGND ≤ 1.8V 37 kΩ SGND tON(MIN) Minimum On-Time (Note 8 ) 45 ns
Analog OV/UV (Overvoltage/Undervoltage) Output Voltage Supervisor Comparators (VOUT_OV/UV_FAULT_LIMIT and VOUT_OV/UV_WARN_LIMIT Monitors)
NOV/UV_COMP Resolution, Output (Note 15) 8 Bits Voltage Supervisors VOV-RNG Output OV Comparator (Note 15) Threshold Detection High Range Scale, MFR_PWM_MODEn[1] = 0b 1 5.6 V Range Low Range Scale, MFR_PWM_MODEn[1] = 1b 0.5 2.7 V VOU-STP Output OV and UV (Note 15) Comparator Threshold High Range Scale, MFR_PWM_MODEn[1] = 0b 22 mV Programming LSB Step Low Range Scale, MFR_PWM_MODEn[1] = 1b 11 mV Size 4677fa 6 For more information www.linear.com/LTM4677 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