link to page 4 LTM4680 ELECTRICAL CHARACTERISTICSThe l denotes the specifications which apply over the specified internaloperating temperature range (Note 2). nis specified as each individual output channel (Note 4). TA = 25°C, VIN = 12V, RUNn= 3.3V,EXTVCC = 0, FREQUENCY_SWITCH = 350kHz and VOUTncommanded to 1.000V unless otherwise noted. Configured with factory-defaultEEPROM settings and per Test Circuit 1, unless otherwise noted.SYMBOLPARAMETERCONDITIONSMINTYPMAX UNITSDigital Inputs SHARE_CLK, WP VIH Input High Threshold Voltage l 1.5 1.8 V VIL Input Low Threshold Voltage l 0.6 1 V Digital Filtering of FAULTn IFLTG Input Digital Filtering FAULTn 3 µs Digital Filtering of PGOODn IFLTG Output Digital Filtering PGOODn 100 µs Digital Filtering of RUNn IFLTG Input Digital Filtering RUN 10 µs PMBus Interface Timing Characteristics fSCL Serial Bus Operating Frequency l 10 400 kHz tBUF Bus Free Time Between Stop and l 1.3 µs Start tHD(STA) Hold Time After Repeated Start l 0.6 µs Condition After This Period, the First Clock is Generated tSU(STA) Repeated Start Condition Setup Time l 0.6 10000 µs tSU(ST0) Stop Condition Setup Time l 0.6 µs tHD(DAT) Date Hold Time Receiving Data l 0 µs Transmitting Data l 0.3 0.9 µs tSU(DAT) Data Setup Time Receiving Data 0.1 µs tTIMEOUT_SMB Stuck PMBus Timer Non-Block Reads Measured from the Last PMBus Start Event 32 ms Stuck PMBus Timer Block Reads 255 tLOW Serial Clock Low Period l 1.3 10000 µs tHIGH Serial Clock High Period l 0.6 µs Note 1: Stresses beyond those listed under Absolute Maximum Ratings controls. The LTM4680I is guaranteed to meet specifications over the full may cause permanent damage to the device. Exposure to any Absolute –40°C to 125°C internal operating temperature range. TJ is calculated from Maximum Rating condition for extended periods may affect device the ambient temperature TA and the power dissipation PD according the reliability and lifetime. formula: Note 2: The LTM4680 is tested under pulsed-load conditions such that TJ = TA + (PD • θJA) TJ ≈ TA. The LTM4680E is guaranteed to meet performance specifications Note that the maximum ambient temperature consistent with these over the 0°C to 125°C internal operating temperature range. Specifications specifications is determined by specific operating conditions in over the –40°C to 125°C internal operating temperature range are assured conjunction with board layout, the rated package thermal resistance and by design, characterization and correlation with statistical process other environmental factors. Rev. B 10 For more information www.analog.com Document Outline Features Applications Typical Application Description Table of Contents 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 Overview, Major Features EEPROM with ECC Power-Up and Initialization Soft-Start Time-Based Sequencing Voltage-Based Sequencing Shutdown Light-Load Current Operation Switching Frequency and Phase PWM Loop Compensation Output Voltage Sensing INTVCC/EXTVCC Power Output Current Sensing and Sub Milliohm DCR Current Sensing Input Current Sensing PolyPhase Load Sharing External/Internal Temperature Sense RCONFIG (Resistor Configuration) Pins Table 1. VOUTn_CFG Pin Strapping Look-Up Table for the LTM4680’s Output Voltage, Coarse Setting (Not Applicable if MFR_CONFIG_ALL[6] = 1b) Table 2. VTRIMn_CFG Pin Strapping Look-Up Table for the LTM4680’s Output Voltage, Fine Adjustment Setting (Not Applicable if MFR_CONFIG_ALL[6] = 1b) Table 3. FSWPH_CFG Pin Strapping Look-Up Table to Set the LTM4680’s Switching Frequency and Channel Phase-Interleaving Angle (Not Applicable if MFR_CONFIG_ALL[6] = 1b) Table 4. ASEL Pin Strapping Look-Up Table to Set the LTM4680’s Slave Address (Applicable Regardless of MFR_CONFIG_ALL[6] Setting) Table 5. LTM4680 MFR_ADDRESS Command Examples Expressed in 7- and 8-Bit Addressing Fault Detection and Handling Status Registers and ALERT Masking Figure 5. LTM4680 Status Register Summary Mapping Faults to FAULT Pins Power Good Pins CRC Protection Serial Interface Communication Protection Device Addressing Responses to VOUT and IIN/IOUT Faults Output Overvoltage Fault Response Output Undervoltage Response Peak Output Overcurrent Fault Response Responses to Timing Faults Responses to VIN OV Faults Responses to OT/UT Faults Internal Overtemperature Fault Response External Overtemperature and Undertemperature Fault Response Responses to Input Overcurrent and Output Undercurrent Faults Responses to External Faults Fault Logging Bus Timeout Protection Similarity Between PMBus, SMBus and I2C 2-Wire Interface PMBus Serial Digital Interface Table 6. Abbreviations of Supported Data Formats Figure 6. PMBus Timing Diagram Figures 7 to 24 PMBus Protocols PMBus Command Summary PMBus Commands Table 7. PMBus Commands Summary (Note: The Data Format Abbreviations Are Detailed in Table 8) Table 8. Data Format Abbreviations Applications Information VIN to VOUT Step-Down Ratios Input Capacitors Output Capacitors Light Load Current Operation Switching Frequency and Phase Output Current Limit Programming 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 Input Current Sense Amplifier Programmable Loop Compensation Checking Transient Response PolyPhase Configuration Connecting The USB to I2C/SMBus/PMBus Controller to the LTM4680 In System LTpowerPlay: An Interactive GUI for Digital Power PMBus Communication and Command Processing Thermal Considerations and Output Current Derating Tables 10 thru 11: Output Current Derating Table 12. Channel Output Voltage vs Capacitor Selection, All Ceramic Configuration, 15A to 30A Load Step with 15A/µs Slew Rate Table 13. Channel Output Voltage vs Capacitor Selection, Bulk and Ceramic Cap Configuration, 15A to 30A Load Step with 15A/µs Slew Rate Table 14. Dual Phase Single Output Voltage vs Capacitor Selection, Bulk and Ceramic Cap Configuration, 30A to 60A Load Step with 30A/µs Slew Rate Derating Curves EMI Performance Safety Considerations Layout Checklist/Example Typical Applications PMBus Command Details Addressing and Write Protect General Configuration Commands On/Off/Margin PWM Configuration Voltage Input Voltage and Limits Output Voltage and Limits Output Current and Limits Input Current and Limits Temperature Power Stage DCR Temperature Calibration Timing Timing—On Sequence/Ramp Timing—Off Sequence/Ramp Precondition for Restart Fault Response Fault Responses All Faults Fault Responses Input Voltage Fault Responses Output Voltage Fault Responses Output Current Fault Responses IC Temperature Fault Responses External Temperature Fault Sharing Fault Sharing Propagation Fault Sharing Response Scratchpad Identification Fault Warning and Status Telemetry NVM Memory Commands Store/Restore Fault Logging Block Memory Write/Read Package Description Table 23. LTM4680 BGA Pinout Revision History Package Photograph Design Resources Related Parts
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