FEATURES
Sequence, Trim, Margin and Supervise Eight Power Supplies
Manage Faults, Monitor Telemetry and Create Fault Logs
■PMBus Compliant Command Set Supported by LTpowerPlayTM GUl
■Margin or Trim Supplies to 0.25% Accuracy
Fast 0V/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 SupervisorsAccurate Monitoring of Eight
Output Voltages, Input Voltage and Internal Die Temperature 12C/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
APPLICATIOnS
■Computers and Network Servers
■Industrial Test and Measurement
High Reliability Systems
■Medical lmaging
■Video
DESCRIPTIOn
The LTC@2977 is an 8-channel Power System Manager used to sequence, trim(servo), margin, supervise, man-age faults, provide telemetry and create fault logs. PMBus commands support power supply sequencing, precision point-of-load voltage adjustmentand 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 disablethe power supplies with optionalretry after a fault is detected. Faults that disable a power supply can automatically trigger black boxEEPROM 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 moni-tors microprocessor activity for a stalled condition andresets the microprocessor if necessary.A single wire bus synchronizes power supplies across multiple LTC power system management devices. Configuration EEPROM sup-ports autonomous operation without additional software.
Feature
- 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 Within 0.25% of Target
- Fast OV/UV Supervisors Per Channel
- Coordinate Sequencing and Fault Management Across Multiple LTC PSM Devices
- 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
Applications
- Computers and Network Servers
- Industrial Test and Measurement
- High Reliability Systems
- Medical Imaging
- Video
(Picture:Pinout / Diagram)
