ANALOG DEVICES DC1962C Demonstration Board, LTC3880EUJ-1, LTC2977CUP, LTC2974CUP, Step Down Controller

DC1962C is a demonstration system that showcases the LTC®3880, LTC2974 and LTC2977 devices. The LTC2974 and LTC2977 devices are I2C/SMBus/PMBus power system managers with EEPROM. The LTC3880 is a dual output PolyPhase® step-down DC/DC controller with digital power system management. The LTC3880 monitors and controls 2 power supply rails, the LTC2974 monitors and controls 4 power supply rails, and the LTC2977 monitors and controls 8 power supply rails. The DC1962C demonstrates the ability of these devices to sequence, trim, margin, supervise, monitor, and log faults for fourteen power supplies. Each power supply channel’s output voltage is monitored and each device monitors its own internal die temperature. Six channels have current and external temperature sensing. The DC1962C is a single circuit board that contains 14 independent power supply rails. The board employs twelve LTC3405A 300mA switch-mode regulators, which are configured to be controlled by the LTC2974 (4) and LTC2977 (8).

• PMBus compliant command set and configuration EEPROM with CRC
• iBlack box fault logging to Internal EEPROM
• Voltage servos precisely adjust supply voltages
• LTC2974 and LTC2977 utilize 10bit trim DACs with soft-connect
• Telemetry reads back VIN, IIN, VOUT, IOUT, Temperature (Int. and Ext.)
• Output sequencer - time based or tracking (tracking support on LTC2974 only)
• Supports multichannel fault management
• Operates autonomously without additional SW
• Powered from 6V to 14V