Features

• Order Custom Programmed Parts
• Sequence, Trim, Margin and Supervise Four Power Supplies
• Manage Faults, Monitor Telemetry and Create Fault Logs
• PMBus Compliant Command Set
• Supported by LTpowerPlay^TM GUI
• Margin or Trim Supplies to 0.25% Accuracy
• Fast OV/UV Supervisors Per Channel
• Fast Output Current Supervisors Per Channel
• Coordinate Sequencing and Fault Management Across Multiple Chips
• Automatic Fault Logging to Internal EEPROM
• Operate Autonomously without Additional Software
• External Temperature and Input Voltage Supervisors
• Accurate Monitoring of Four Output Voltages, Four Output Currents, Four External Temperatures, Input Voltage and Internal Die Temperature
• I²C/SMBus Serial Interface
• Can Be Powered from 3.3V, or 4.5V to 15V
• Available in 64-Lead 9mm × 9mm QFN Package
• LTpowerPlay Configuration and Development Tool

Typical Application

Description

The LTC®2974 is a 4-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 over and under current, voltage and temperature threshold limits for four power supply output channels as well as over and under voltage threshold limits for a single power supply input channel. 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 four output voltages, four output currents, four external temperatures, one input voltage and die temperature. Output power is also calculated. 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.