Features and Benefits
- 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.
- Computers and Network Servers
- Industrial Test and Measurement
- High Reliability Systems
- Medical Imaging
Product Lifecycle Not Recommended for New Designs
This designates products ADI does not recommend broadly for new designs.
Evaluation Kits (1)
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.
Documentation & Resources
R544 Reliability Data3/26/2018
DC1508B - Demo Manual6/24/2014
LTC2977 - Migration Guide6/16/2017
Design Checklist for LTC297X Family of PSM Managers8/22/2016
LTC2978A - Migration Guide7/2/2013
Digital Power System Management4/4/2017
Tools & Simulations
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Pricing displayed is based on 1-piece.
Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.