データシート (DC2028A)目次Features1Applications1Typical Application1Description1Absolute Maximum Ratings4Order Information4Pin Configuration4Electrical Characteristics5PMBus Timing Diagram9Typical Performance Characteristics10Pin Functions13Block Diagram15Operation16Operation Overview16EEPROM17Reset17Write-Protect Pin17Other Operations17Clock Sharing17PMBus Serial Digital Interface18PMBus18Device Address21Processing Commands22PMBus Command Summary23Summary Table23Data Formats27PMBus Command Description28Addressing and Write Protect28PAGE28WRITE_PROTECT28MFR_PAGE_FF_MASK29MFR_I2C_BASE_ADDRESS29MFR_COMMAND_PLUS, MFR_DATA_PLUS0, MFR_DATA_PLUS1, MFR_STATUS_PLUS0, and MFR_STATUS_PLUS130Reading Fault Log Using Command Plus and Mfr_data_plus031Peek Operation using Mfr_data_plus032Enabling and Disabling Poke Operations32Poke Operation Using Mfr_data_plus032Command Plus Operations Using Mfr_data_plus132Operation, Mode and EEPROM Commands33OPERATION33ON_OFF_CONFIG34CLEAR_FAULTS34STORE_USER_ALL and RESTORE_USER_ALL35CAPABILITY35VOUT_MODE35Output Voltage Related Commands36VOUT_COMMAND, VOUT_MAX, VOUT_MARGIN_HIGH, VOUT_MARGIN_LOW, VOUT_OV_FAULT_LIMIT, VOUT_OV_WARN_LIMIT, VOUT_UV_WARN_LIMIT, VOUT_UV_FAULT_LIMIT, POWER_GOOD_ON and POWER_GOOD_OFF36Input Voltage Related Commands36VIN_ON, VIN_OFF, VIN_OV_FAULT_LIMIT, VIN_OV_WARN_LIMIT, VIN_UV_WARN_LIMIT and VIN_UV_FAULT_LIMIT36Temperature Related Commands37OT_FAULT_LIMIT, OT_WARN_LIMIT, UT_WARN_LIMIT and UT_FAULT_LIMIT37Timer Limits37TON_DELAY, TON_RISE, TON_MAX_FAULT_LIMIT and TOFF_DELAY37Fault Response for Voltages Measured by the High Speed Supervisor38VOUT_OV_FAULT_RESPONSE and VOUT_UV_FAULT_RESPONSE38Fault Response for Values Measured by the ADC39OT_FAULT_RESPONSE, UT_FAULT_RESPONSE, VIN_OV_FAULT_RESPONSE and VIN_UV_FAULT_RESPONSE39Timed Fault Response40TON_MAX_FAULT_RESPONSE40Status Commands41STATUS_BYTE41STATUS_WORD41STATUS_VOUT42STATUS_INPUT42STATUS_TEMPERATURE42STATUS_CML43STATUS_MFR_SPECIFIC43ADC Monitoring Commands44READ_VIN44READ_VOUT44READ_TEMPERATURE_144PMBUS_REVISION44Manufacturer Specific Commands45MFR_CONFIG_LTC297745Tracking Supplies On and Off46Tracking Implementation48MFR_CONFIG_ALL_LTC297749MFR_FAULTBz0_PROPAGATE, MFR_FAULTBz1_PROPAGATE50MFR_PWRGD_EN51MFR_FAULTB00_RESPONSE, MFR_FAULTB01_RESPONSE, MFR_FAULTB10_RESPONSE and MFR_FAULTB11_RESPONSE52MFR_VINEN_OV_FAULT_RESPONSE53MFR_VINEN_UV_FAULT_RESPONSE54MFR_RETRY_COUNT55MFR_RETRY_DELAY55MFR_RESTART_DELAY55MFR_VOUT_PEAK56MFR_VIN_PEAK56MFR_TEMPERATURE_PEAK56MFR_DAC57MFR_POWERGOOD_ASSERTION_DELAY57MFR_PADS58MFR_SPECIAL_ID59MFR_SPECIAL_LOT59MFR_VOUT_DISCHARGE_THRESHOLD59MFR_COMMON60USER_DATA_00, USER_DATA_01, USER_DATA_02, USER_DATA_03, USER_DATA_04, MFR_LTC_RESERVED_1 and MFR_LTC_RESERVED_260MFR_VOUT_MIN61MFR_VIN_MIN61MFR_TEMPERATURE_MIN61MFR_STATUS_262MFR_TELEMETRY63Watchdog Operation64MFR_WATCHDOG_T_FIRST and MFR_WATCHDOG_T64Bulk Programming the User EEPROM Space65MFR_EE_UNLOCK65MFR_EE_ERASE66MFR_EE_DATA66Response When Part Is Busy67MFR_EE Erase and Write Programming Time67Fault Log Operation67MFR_FAULT_LOG_STORE67MFR_FAULT_LOG_RESTORE67MFR_FAULT_LOG_CLEAR68MFR_FAULT_LOG_STATUS68MFR_FAULT_LOG69Applications Information76Overview76Powering the LTC297776Setting Command Register Values76Sequence, Servo, Margin and Restart Operations76Command Units On or Off76On Sequencing77On State Operation77Servo Modes77DAC Modes77Margining78Off Sequencing78VOUT Off Threshold Voltage78Automatic Restart Via MFR_RESTART_DELAY Command and CONTROLn pin78Fault Management78Output Overvoltage and Undervoltage Faults78Output Overvoltage and Undervoltage Warnings79Configuring the VIN_EN Output79Multichannel Fault Management81Interconnect Between Multiple LTC2977’s81Application Circuits82Trimming and Margining DC/DC Converters with External Feedback Resistors82Four-Step Resistor Selection Procedure for DC/DC Converters with External Feedback Resistors83Trimming and Margining DC/DC Converters with a TRIM Pin84Two-Step Resistor and DAC Full-Scale Voltage Selection Procedure for DC/DC Converters with a TRIM Pin84Measuring Current84Measuring Current with a Sense Resistor85Measuring Current with Inductor DCR85Single Phase Design Example85Measuring Multiphase Currents85Multiphase Design Example86Anti-aliasing Filter Considerations86Sensing Negative Voltages87Connecting the DC1613 USB to I2C/SMBus/PMBus Controller to the LTC2977 in System87Design Checklist89LTpowerPlay: An Interactive GUI for Power System Managers89PCB Assembly and Layout Suggestions90Bypass Capacitor Placement90Exposed Pad Stencil Design90PC Board Layout91Unused ADC Sense Inputs91Package Description92Revision History93Typical Application94Related Parts94サイズ: 1.32MBページ数: 94Language: Englishマニュアルを開く