Datasheet LTM4677 (Analog Devices) - 10

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 EEPROM Characteristics
Endurance (Note 13) 0°C ≤ TJ ≤ 85°C During EEPROM Write Operations (Note 3) l 10,000 Cycles Retention (Note 13) TJ < TJ(MAX), with Most Recent EEPROM Write Operation Having l 10 Years Occurred at 0°C ≤ TJ ≤ 85°C (Note 3) Mass_Write Mass Write Operation Execution of STORE_USER_ALL Command, 0°C ≤ TJ ≤ 85°C 440 4100 ms Time (ATE-Tested at TJ = 25°C) (Notes 3, 13)
Digital I/Os
VIH Input High Threshold SCL, SDA, RUNn, GPIOn (Note 15) 1.35 V Voltage SHARE_CLK, WP (Note 15) 1.8 V VIL Input Low Threshold SCL, SDA, RUNn, GPIOn (Note 15) 0.8 V Voltage SHARE_CLK, WP (Note 15) 0.6 V VHYST Input Hysteresis SCL, SDA (Note 15) 80 mV VOL Output Low Voltage SCL, SDA, ALERT, RUNn, GPIOn, SHARE_CLK: ISINK = 3mA l 0.3 0.4 V IOL Input Leakage Current SDA, SCL, ALERT, RUNn: 0V ≤ VPIN ≤ 5.5V l ±5 µA GPIOn and SHARE_CLK: 0V ≤ VPIN ≤ 3.6V l ±2 µA tFILTER Input Digital Filtering RUNn (Note 15) 10 µs GPIOn (Note 15) 3 µs CPIN Input Capacitance SCL, SDA, RUNn, GPIOn, SHARE_CLK, WP (Note 15) 10 pF
PMBus Interface Timing Characteristics
fSMB Serial Bus Operating (Note 15) 10 400 kHz Frequency tBUF Bus Free Time Between (Note 15) 1.3 μs Stop and Start tHD,STA Hold Time After Repeated Time Period After Which First Clock Is Generated (Note 15) 0.6 µs Start Condition tSU,STA Repeated Start Condition (Note 15) 0.6 μs Setup Time tSU,STO Stop Condition Setup (Note 15) 0.6 μs Time tHD,DAT Data Hold Time Receiving Data (Note 15) 0 µs Transmitting Data (Note 15) 0.3 0.9 µs tSU,DAT Data Setup Time Receiving Data (Note 15) 0.1 μs tTIMEOUT_SMB Stuck PMBus Timer Measured from the Last PMBus Start Event: Timeout Block Reads MFR_CONFIG_ALL[3] = 0b (Note 15) 150 ms Non-Block Reads MFR_CONFIG_ALL[3] = 0b (Note 15) 32 ms MFR_CONFIG_ALL[3] = 1b (Note 15) 250 ms tLOW Serial Clock Low Period (Note 15) 1.3 10000 μs tHIGH Serial Clock High Period (Note 15) 0.6 μs
Note 1:
Stresses beyond those listing under Absolute Maximum Ratings over the –40°C to 125°C internal operating temperature range are assured may cause permanent damage to the device. Exposure to any Absolute by design, characterization and correlation with statistical process controls. Maximum Rating conditions for extended periods may affect device The LTM4677I is guaranteed to meet specifications over the full –40°C reliability and lifetime. to 125°C internal operating temperature range. Note that the maximum
Note 2:
The LTM4677 is tested under pulsed-load conditions such that ambient temperature consistent with these specifications is determined by T specific operating conditions in conjunction with board layout, the rated J ≈ TA. The LTM4677E is guaranteed to meet performance specifications over the 0°C to 125°C internal operating temperature range. Specifications package thermal resistance and other environmental factors. 4677fa 10 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