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Linear Technology Corporation introduces the LTC2974, an EEPROM-based power manager that implements complete digital power system management with four or more power rails. The LTC2974 uses an I2C interface and PMBus command set to monitor and control positive or negative power supplies, providing fast fault finding and debugging capabilities during power system design, development, production, and fault analysis. Any power supply with run pins can be sorted and controlled using trace or time-based events. The LTC2974's four channels simultaneously monitor voltage and current as well as external temperature, so the user can compensate for the RDS(ON) or inductor DCR of the shift MOSFET. Each power supply can be margined and fine-tuned with temperature changes, using a digital servo loop to measure rail voltage and continuously adjust to maintain accuracy. All power functions of the LTC2974 are performed with no discounts, and the overall unadjusted error is better than 0.25. Users can intuitively configure and interrogate the LTC2974's registers, user settings, and fault logs with the powerful LTpowerPlayTM GUI. For applications that require more than four power supplies, the LTC2974 can be cascaded with a single-wire synchronous bus, allowing fault correlation to be established across multiple devices sharing a faulty bus. The LTC2974 is suitable for a wide range of applications, including uninterruptible power supplies (UPS), automotive, medical, video and networking applications. The LTC2974 integrates key cell components such as differential measurement and regulation, high resolution data converters, high-storage EEPROM and a high-precision reference for digital management of pure analog power systems. The programmable watchdog timer provides monitoring of external microcontrollers, FPGAs, and ASICs. All four channels are fully functional and have dedicated monitoring, monitoring, sequencing, margining, fine-tuning, and fault protection. The black box fault record provides a way to diagnose key parameters stored in the EEPROM at the time of the fault. At the site, the LTC2974 operates autonomously to provide continuous monitoring and take pre-defined actions to respond to failures. The LTC2974 also utilizes an internal chip temperature sensor for protection. This very high level of mixed-signal integration ensures that the LTC2974 can easily and reliably manage even the most complex power systems. Together with its 8-channel competing device LTC2978, the LTC2974 is part of Linear Technology's growing line of digital power managers and complements Linear Technology's complete stand-alone DC/DC regulator product library, for example: 15mmx15mm Modle Packaged in 15ALTM4627 or dual channel 8ALTM4628. The LTC2974 is available in a 64-lead 9mm x 9mm QFN package that is RoHS compliant and is available in commercial and industrial temperature ranges. Using the DC1856 demo system and the DC1613USB to PMBus controller shows how the LTC2974 manages four discrete power supplies. The demonstration system is available at or the local Linear Technology office. The LTC2974 is priced at $8.85 each in 1,000-piece quantities. For more information, please visit Photo Caption: 4-Channel Digital Power Manager Monitors Voltage, Current, and Temperature Performance Summary: LTC2974 I2C/SMBus Serial Interface PMBus Compatible Command Set CRC-Enabled Configuration EEPROM Black Box Fault Log to Internal EEPROM Differential with 0.25 Total Unadjusted Error Input, 16-bit ADC 4 voltage servo circuits use a 10-bit DAC with soft-connect function to accurately adjust the supply voltage. Monitor 4 output voltages, 4 output currents and one input voltage. Monitor 4 external temperature sensors and internal chip temperature 4 channels. Sequencer (Time-Based or Tracking) Programmable Watchdog Timer 4 UV/OVVOUT and One VIN Monitor 4 Overcurrent/Underflow Monitors Support Multi-Channel Fault Management The LTC2974 is available in 3.3V or 4.5V to 15V range Internal power supply is available in a 64-pin 9mm x 9mm QFN package (This article Source: Alibaba)