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

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

LTC2977 Typical Application
LTC2977 Typical Application

Description

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.

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

QFN-64

LTC2977 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC2977CUP#PBF QFN 64 C $15.64 $10.95 View
LTC2977CUP#TRPBF QFN 64 C $11.05 View
LTC2977IUP#PBF QFN 64 I $17.99 $12.59 View
LTC2977IUP#TRPBF QFN 64 I $12.69 View
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC1508B-A LTC2977, LTC2978A, LTC2978 Socketed Programming Board [requires DC1613] $95.00
DC1962C Power System Management Demo Board (PowerStick): 14-Supply Management with LTC2977, LTC2974 & LTC3880 [Requires DC1613] $95.00
DC1962C-KIT Starter Kit for Power System Management [Includes DC1962C, DC1613A] $125.00
DC2028A LTC2977 Demo Board: Octal Power Supply Manager [Requires DC1613] $75.00
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Companion Boards

Part Number Description Price Documentation
DC1613A USB-to-PMBus Controller $50.00
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Click here to view our complete list of demo boards

Applications

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

Product Notifications

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Design Tools

LTpowerPlay

LTpowerPlay is a powerful development environment supporting Linear Technology's Digital Power System Management (PSM) products, providing unprecedented diagnostic and debug features.

Click here to download LTpowerPlay

Technical Support