Features

• 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 V_OUT and One V_IN 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

Description

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.