16-Channel PMBus Low-Voltage Power System Manager

The LTC2979 is a 16-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 sixteen power supply output channels and two power supply input channels, 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 sixteen output voltages, two input voltages 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 ADI Power System Management (PSM) devices. Configuration EEPROM with ECC supports autonomous operation without additional software.

APPLICATIONS

* Computers and Network Servers

* Industrial Test and Measurement

* High Reliability Systems

* Medical Imaging

* Video

* Sequence, Trim, Margin and Supervise 16 Power Supplies

* Manage Faults, Monitor Telemetry and Create Fault Logs

* PMBus Compliant Command Set

* Supported by LTpowerPlay® GUI

* Margin or Trim Supplies to within 0.5% of Target

* Fast OV/UV Supervisors per Channel

* Coordinate Sequencing and Fault Management Across Multiple ADI PSM Devices

* Automatic Fault Logging to Internal EEPROM