Supply sequencing, supervision, and EEPROM fault-logging are built into the LTC2972. Sequencing is accomplished with time delays written to an internal register or with cascaded power-good signals. Dedicated fast comparators signal faults when POL input voltage, output voltage, and temperature stray outside digitally settable low and high thresholds. Faults trigger EEPROM black box recording, simplifying failure analysis while providing insight into future system improvements. A first fault command provides additional insight into causes of system failure. Faults can be flexibly propagated to other supplies or other DPSM devices.
The LTC2972 features voltage, current, power, and energy monitoring of the intermediate bus input to POL converters. Monitoring circuit board power and energy use is a prerequisite for managing, optimizing, and reducing their consumption in order to lower server and data center cooling and utility costs. The LTC2972 relieves the host of burdensome polling and computation by conveniently providing the input energy, reported in joules, and the elapsed time through a PMBus interface, the industry standard for communicating with power management and conversion devices. When combined with its digital measurements of POL output voltages, currents, and power, the LTC2972 enables long-term monitoring of a power system’s conversion efficiency.