LTC2978 - Octal Digital Power Supply Manager with EEPROM


  • I2C/SMBus Serial Interface
  • PMBus Compliant Command Set
  • Configuration EEPROM with CRC
  • Black Box Fault Logging to Internal EEPROM
  • Differential Input, 16-Bit ΔΣ ADC with Less Than ±0.25% of Total Unadjusted Error
  • Eight Voltage Servos Precisely Adjust Output Voltages Using Eight 10-Bit DACs with Soft-Connect
  • Monitors Eight Output Voltages and One Input Voltage and Internal Die Temperature
  • 8-Channel Sequencer
  • Programmable Watchdog Timer
  • Eight UV/OV VOUT and One VIN Supervisor
  • Supports Multi-Channel Fault Management
  • Operates Autonomously without Additional Software
  • LTC2978 Can Be Powered from 3.3V or 4.5V to 15V
  • Available in 64-pin 9mm × 9mm QFN package
  • LTpowerPlay Configuration and Development Tool

Typical Application

LTC2978 Typical Application
LTC2978 Typical Application


The LTC®2978 is an octal, digital power-supply monitor, supervisor, sequencer, and margin controller. Eight output channels can be managed per user defined configuration settings. Supervisory functions include fault OV/UV threshold limits for eight output channels and one input channel. Programmable fault dependencies and responses allow the power supplies to be disabled with optional retry after a fault has been detected. Serial bus telemetry allows eight output voltages, one input voltage, die temperature and fault status to be monitored. In addition, odd numbered channels can be configured to measure the voltage across a current sense resistor. Power supply sequencing, precision point-of-load voltage adjustment and margining are supported with PMBus commands. A programmable watchdog timer monitors microprocessor activity for a stalled condition and resets the microprocessor if necessary. The 1-wire synchronization bus supports power supply sequencing across multiple LTC digital power devices. User programmable parameters can be stored in EEPROM. Faults and telemetry data can be logged to EEPROM for diagnostic analysis.


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

LTC2978 Package Drawing

Order Info

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
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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


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Design Tools

Linear Technology provides a variety of custom design simulation tools and device models to allow even novice designers to quickly and easily evaluate circuits using high performance switching regulators, amplifiers, data converters, filters and more. Please visit our Design Tools page to view and download:

LTpowerPlay is the FREE Graphical User Interface (GUI) software provided by Linear Technology for use with our family of digital power products. LTpowerPlay provides unprecedented diagnostic and debug features. It becomes a valuable diagnostic tool during board bring-up to program or tweak the power management scheme in a system or to diagnose power issues when bringing up rails.

  • Download LTpowerPlay software
  • When LTpowerPlay launches the first time, it will prompt you to request a license, click 'Request a License Key...', enter the required information, then click 'Send License Request'
  • Once you have entered the registration information, you will receive an email with your license file and instructions for installing it
  • For further information, please visit
  • Access technical support documents for LTC Digital Power Products by visiting

Technical Support