LTC2978A

NOT RECOMMENDED FOR NEW DESIGNS

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

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Overview

  • 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% Compatible with the LTC2978
  • Available in 64-pin 9mm × 9mm QFN Package

The LTC2978A 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.

Applications

  • Computers and Network Servers
  • Industrial Test and Measurement
  • High Reliability Systems
  • Medical Imaging
  • Video
LTC2978A
8-Channel PMBus Power System Manager Featuring Accurate Output Voltage Measurement
8-Channel PMBus Power System Manager Typical ADC Total Unadjusted Error vs Temperature Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Informational 1

Product Information 3

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
LTC2977
RECOMMENDED FOR NEW DESIGNS 8-Channel PMBus Power System Manager Featuring Accurate Output Voltage Measurement
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Tools & Simulations

LTpowerPlay®

LTpowerPlay® is a powerful, Windows-based development environment supporting Linear Technology's Digital Power System Management (PSM) products.

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Evaluation Kits

eval board
schematic 1
schematic 2
DC1508B-A

LTC2977, LTC2978A, LTC2978 Socketed Programming Board (Requires DC1613)

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Product Details

The DC1508B programming board contains the circuitry needed to program and verify the EEPROM of the LTC2974, LTC2975, LTC2977, LTC2978, and LTC2978A. This is its sole purpose. The DC1508B is shipped with a clamshell style programming socket installed. The EEPROM contains the factory default configuration. The LTpowerPlay™ *.proj file that corresponds to the factory default can be found in the GUI.
DC1508B-A
LTC2977, LTC2978A, LTC2978 Socketed Programming Board (Requires DC1613)
DC1508B - Schematic DC1508B - Demo Board Image

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