Datasheet LTM4686, LTM4686-1 (Analog Devices) - 6

LTM4686/LTM4686-1
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, VOUT_COMMANDn = 1V and VOUT_UV_FAULT_RESPONSEn = TON_MAX_FAULT_RESPONSEn = 0x00 unless otherwise noted. All other command codes configured per factory-default EEPROM settings unless otherwise noted. Tested per Circuit 1, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VUV-RNG Output UV Comparator (Note 15) Threshold Detection High Range Scale, MFR_PWM_MODEn[1] = 0b 1 3.6 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 2V ≤ V + – VOSNS0 – VVOSNS0 ≤ 3.6V, MFR_PWM_MODE0[1] = 0b l ±2 % 1V ≤ V + – VOSNS0 – VVOSNS0 ≤ 2.7V, MFR_PWM_MODE0[1] = 1b l ±2 % 0.5V ≤ V + – VOSNS0 – VVOSNS0 < 1V, MFR_PWM_MODE0[1] = 1b l ±20 mV 2V ≤ VVOSNS1 – VSGND ≤ 3.6V, MFR_PWM_MODE1[1] = 0b l ±2 % 1.5V ≤ VVOSNS1 – VSGND ≤ 2.7V, 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- SVIN OV/UV (Note 15) 8 Bits COMP Comparator Threshold- Programming Resolution SVIN-OU-RANGE SVIN OV/UV l 4.5 20 V Comparator Threshold- Programming Range SVIN-OU-STP SVIN OV/UV (Note 15) 82 mV Comparator Threshold- Programming LSB Step Size SVIN-OU-ACC SVIN OV/UV 9V < SVIN ≤ 20V l ±2.5 % Comparator Threshold 4.5V ≤ SVIN ≤ 9V l ±225 mV Accuracy tPROP-SVIN-HIGH- SVIN OV/UV Test Circuit 1, and: VIN Comparator VIN_ON = 9V; SVIN Driven from 8.775V to 9.225V l 35 µs Response Time, VIN_OFF = 9V; SVIN Driven from 9.225V to 8.775V l 35 µs High VIN Operating Configuration tPROP-SVIN-LOW- SVIN OV/UV Test Circuit 2, and: VIN Comparator VIN_ON = 4.5V; SVIN Driven from 4.225V to 4.725V l 35 µs Response Time, VIN_OFF = 4.5V; SVIN Driven from 4.725V to 4.225V l 35 µs Low VIN Operating Configuration
Channels 0 and 1 Output Voltage Readback (READ_VOUTn )
NVO-RB Output Voltage (Note 15) 16 Bits Readback Resolution 244 µV and LSB Step Size VO-F/S Output Voltage VRUNn = 0V (Notes 7, 15) 8 V Full-Scale Digitizable Range V + – O-RB-ACC Output Voltage Channel 0: 1V ≤ VVOSNS0 – VVOSNS0 ≤ 3.6V l Within ±0.5% of Reading Readback Accuracy Channel 0: 0.6V ≤ V + – VOSNS0 – VVOSNS0 < 1V l Within ±5mV of Reading Channel 1: 1V ≤ V VOSNS1 – VSGND ≤ 3.6V l Within ±0.5% of Reading Channel 1: 0.6V ≤ VVOSNS1 – VSGND < 1V l Within ±5mV of Reading Rev. B 6 For more information www.analog.com 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 LTM4686 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 Photographs Package Description Revision History Typical Application Design Resources Related Parts