DC1978A - 

Demonstration Board for LTC2974 PMBus Power System Manager

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Product Information

Power Management
Demonstration Board LTC2974
Linear Technology
Power Supply
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Product Overview

DC1978A is a demonstration system for the LTC2974 quad I2C/SMBus/PMBus power supply monitor and controller with EEPROM. The DC1978A demonstrates the ability of the LTC2974 to monitor, supervise, sequence, trim, margin and log faults for four power supplies. Each power supply channel of the LTC2974 monitors current, voltage and temperature. This demonstration system is supported by the LTpowerPlay graphical user interface that enables complete control of all LTC2974 features. The DC1978A consists of two circuit boards designed to work as a pair, DC1809A and DC1810A. The DC1809A contains all the circuitry needed to insert the LTC2974 into a power system and control four power supplies. The DC1810A contains four power supplies, two LTC3860 DrMOS supplies and two LTM4620 supplies, which are configured to be controlled by the LTC2974. Together, these two boards form a sophisticated four channel digitally programmable power supply.
  • I2C/SMBus serial interface
  • PMBus compliant command set
  • Configuration EEPROM with CRC
  • Black box fault logging to internal EEPROM
  • Differential input, 16bit ΔΣ ADC with less than ±0.25% of total unadjusted error
  • Four voltage servos precisely adjust supply voltages using 10bit DACs with soft connect
  • Monitors four output voltages, four output currents and one input voltage
  • Monitors four external temperature sensors and internal die temperature
  • 4 channel sequencer, time based or tracking
  • Programmable Watchdog Timer


Communications & Networking, Industrial, Medical, Imaging, Video & Vision


Companion with DC1613A USB to PMBus controller, sold separately.