LTC2972 features current, power and energy monitoring of the intermediate bus input to point-of-load (POL) converters. Intended to relieve the host of polling and computation, the LTC2972 provides the input energy, reported in joules, and the elapsed time through a PMBus interface. When combined with the chip’s digital measurement of POL output voltages, currents, and power, the LTC2972 enables long-term monitoring of a power system’s conversion efficiency.
Supply output voltages are trimmed, margined, and monitored with a 16-bit ADC with 0.25% total unadjusted error (TUE). Supply output currents are measured using a sense resistor, inductor DCR, or the IMON output of a power supply. Supply sequencing, supervision and EEPROM fault-logging are built in. Faults trigger EEPROM black box recording, simplifying failure analysis while providing insight into future system improvements. Programmable power good or GPIO pins are available with each channel.
The LTC2972 has the ability to connect to other power system managers to coordinate sequencing and fault management of more than two rails. PMBus-compatible commands are used for flexible programming and data readback of the power system. Configuration is achieved through the LTpowerPlay development environment, which supports all Power by Linear power system management devices.