Datasheet LTM4677 (Analog Devices) - 7

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
VOV-ACC Output OV Comparator (See Note 14) Threshold Accuracy 1V ≤ V + – VOSNS0 – VVOSNS0 ≤ 1.8V, MFR_PWM_MODE0[1] = 1b l ±2 % 0.5V ≤ V + – VOSNS0 – VVOSNS0 < 1V, MFR_PWM_MODE0[1] = 1b l ±20 mV 1.5V ≤ VVSENSE1 – VSGND ≤ 1.8V, MFR_PWM_MODE1[1] = 1b l ±2 % 0.5V ≤ VVSENSE1 – VSGND < 1.5V, MFR_PWM_MODE1[1] = 1b l ±30 mV VUV-RNG Output UV Comparator (Note 15) Threshold Detection High Range Scale, MFR_PWM_MODEn[1] = 0b 1 5.4 V Range Low Range Scale, MFR_PWM_MODEn[1] = 1b 0.5 2.7 V VUV-ACC Output UV Comparator (See Note 14) Threshold Accuracy 1V ≤ V + – VSENSE0 – VVSENSE0 ≤ 1.8V, MFR_PWM_MODE0[1] = 1b l ±2 % 0.5V ≤ V + – VSENSE0 – VVSENSE0 < 1V, MFR_PWM_MODE0[1] = 1b l ±20 mV 1.5V ≤ VVOSNS1 – VSGND ≤ 1.8V, MFR_PWM_MODE1[1] = 1b l ±2 % 0.5V ≤ VVOSNS1 – VSGND < 1.5V, MFR_PWM_MODE1[1] = 1b l ±30 mV tPROP-OV Output OV Comparator Overdrive to 10% Above Programmed Threshold 35 µs Response Times tPROP-UV Output UV Comparator Underdrive to 10% Below Programmed Threshold 50 µs Response Times
Analog OV/UV SVIN Input Voltage Supervisor Comparators (Threshold Detectors for VIN_ON and VIN_OFF)
NSVIN-OV/UV-COMP SVIN OV/UV Comparator (Note 15) 8 Bits Threshold-Programming Resolution SVIN-OU-RANGE SVIN OV/UV Comparator l 4.5 18 V Threshold-Programming Range SVIN-OU-STP SVIN OV/UV Comparator (Note 15) 82 mV Threshold-Programming LSB Step Size SVIN-OU-ACC SVIN OV/UV Comparator 9V < SVIN ≤ 16V l ±2.5 % Threshold Accuracy 4.5V ≤ SVIN ≤ 9V l ±225 mV tPROP-SVIN-HIGH-VIN SVIN OV/UV Comparator Test Circuit 1, and: Response Time, High VIN VIN_ON = 9V; SVIN Driven from 8.775V to 9.225V l 35 µs Operating Configuration VIN_OFF = 9V; SVIN Driven from 9.225V to 8.775V l 35 µs tPROP-SVIN-LOW-VIN SVIN OV/UV Comparator Test Circuit 2, and: Response Time, Low VIN VIN_ON = 4.5V; SVIN Driven from 4.225V to 4.725V l 35 µs Operating Configuration VIN_OFF = 4.5V; SVIN Driven from 4.725V to 4.225V l 35 µs
Channels 0 and 1 Output Voltage Readback (READ_VOUTn )
NVO-RB Output Voltage Readback (Note 15) 16 Bits Resolution and LSB Step 244 µV Size VO-F/S Output Voltage Full-Scale VRUNn = 0V (Notes 7, 15) 8 V Digitizable Range V + – O-RB-ACC Output Voltage Readback Channel 0: 1V ≤ VVOSNS0 – VVOSNS0 ≤ 1.8V l Within ±0.5% of Reading Accuracy Channel 0: 0.6V ≤ V + – VOSNS0 – VVOSNS0 < 1V l Within ±5mV of Reading Channel 1: 1V ≤ V VOSNS1 – VSGND ≤ 1.8V l Within ±0.5% of Reading Channel 1: 0.6V ≤ VVOSNS1 – VSGND < 1V l Within ±5mV of Reading tCONVERT-VO-RB Output Voltage Readback MFR_ADC_CONTROL = 0×00 (Notes 9, 15) 90 ms Update Rate MFR_ADC_CONTROL = 0×00 (Notes 9, 15) 27 ms MFR_ADC_CONTROL = 0×05 or 0×09 (Notes 9, 15) 8 ms 4677fa For more information www.linear.com/LTM4677 7 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