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LTC2977 - 8-Channel PMBus Power System Manager Featuring Accurate Output Voltage Measurement

The LTC®2977 is an 8-channel Power System Manager used to sequence, trim (servo), margin, supervise, manage faults, provide telemetry and create fault logs. PMBus commands support power supply sequencing, precision point-of-load voltage adjustment and margining. DACs use a proprietary soft-connect algorithm to minimize supply disturbances. Supervisory functions include overvoltage and undervoltage threshold limits for eight power supply output channels and one power supply input channel, as well as over and under temperature limits. Programmable fault responses can disable the power supplies with optional retry after a fault is detected. Faults that disable a power supply can automatically trigger black box EEPROM storage of fault status and associated telemetry. An internal 16-bit ADC monitors eight output voltages, one input voltage, and die temperature. In addition, odd numbered channels can be configured to measure the voltage across a current sense resistor. A programmable watchdog timer monitors microprocessor activity for a stalled condition and resets the microprocessor if necessary. A single wire bus synchronizes power supplies across multiple LTC power system management devices. Configuration EEPROM supports autonomous operation without additional software.

Features Order Custom Programmed Parts Sequence, Trim, Margin and Supervise Eight Power Supplies Manage Faults, Monitor Telemetry and Create Fault Logs PMBus Compliant Command Set Supported by LTpowerPlay™ GUI Margin or Trim Supplies to 0.25% Accuracy Fast OV/UV Supervisors Per Channel Coordinate Sequencing and Fault Management Across Multiple Chips Automatic Fault Logging to Internal EEPROM Operate Autonomously without Additional Software Internal Temperature and Input Voltage Supervisors Accurate Monitoring of Eight Output Voltages, Input Voltage and Internal Die Temperature I2C/SMBus Serial Interface Can Be Powered from 3.3V, or 4.5V to 15V Programmable Watchdog Timer 100% Pin-Compatible Upgrade to the LTC2978/LTC2978A Available in 64-pin 9mm × 9mm QFN Package LTpowerPlay Configuration and Development Tool Typical Application

Applications Computers and Network Servers Industrial Test and Measurement High Reliability Systems Medical Imaging Video Packaging

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