Analog Devices LTC2975 | Demoboard DC2022A

Description

The DC2022A is a demonstration system that showcases the LTC®2975, a 4-channel I2C/SMBus/PMBus power system manager with EEPROM. The LTC2975 monitors and controls four power supply rails. The LTC2975 alsomonitors input current and input voltage, which are used to calculate input power and accumulate energy. The DC2022A demonstrates the ability of the LTC2975 to sequence, trim, margin, supervise, monitor, and log faultsfor four power supplies. Each power supply channel’s output voltage is monitored and the LTC2975 monitors its own internal die temperature.

The DC2022A is a single circuit board that contains four independent power supply rails. The board employs four LTC3405A 300mA switch-mode regulators, which are configured to be controlled by the LTC2975. The DC2022A demo board provides a sophisticated 4-channel digitallyprogrammable power supply system. The rail voltages are programmable within the trim range shown in the Performance Summary table.

This demonstration system is supported by the LTpowerPlay ™ graphical user interface (GUI) which enables complete control of all the features of the device. Together, the LTpowerPlay software and DC2022A hardware systemcreate a powerful development environment for designing and testing configuration settings of the LTC2975. These settings can be stored in the device’s internal EEPROM or in a file. This file can later be used to order pre-programmed devices or to program devices in a production environment. The software displays all of the configuration settingsand real time measurements from the power system management IC. Telemetry allows easy access and decodingof the fault log created by the LTC2975. The boardcomes pre-programmed with the EEPROM values appropriate for the four power supply rails on the DC2022A. Just plug and play!

Multiple DC2022A boards can be cascaded together to form a high channel count power supply (see the Multi-Board Arrays section). This cascaded configuration demonstrates features of the LTC Power System Management ICs which enable timing and fault information to be shared acrossmultiple power system management ICs. The user can configure up to eight DC2022A boards, thereby controlling up to 32 separate power supply rails. Larger board arrays can be built using programmable I2C base addresses orbus segmentation.

The DC2022A demo board can be powered by an external power supply, such as a +12VDC supply. Communication with the software is provided through the DC1613 USB-to- I2C/SMBus/PMBus Controller. The following is a checklist of items which can be obtained from the LTC website orLTC Field Sales.

• USB-to-I2C/SMBus/PMBus Controller (DC1613)

• LTpowerPlay Software

Features

• Sequence, Trim, Margin, and Supervise Four Power Supplies
• Manage Faults, Monitor Telemetry, and Create Fault Logs
• PMBus Compliant Command Set
• Supported by LTpowerPlay GUI
• Margin or Trim Supplies to 0.25% Accuracy
• Four IOUT and One IIN Monitor
• Input Power Measurement and Energy Accumulation
• Fast OV/UV Supervisors per Channel
• Supports Multi-Channel Fault Management
• Automatic Fault Logging to Internal EEPROM
• Operates Autonomously without Additional SW
• Telemetry Reads Back VIN, VOUT, and Temperature
• 4-Channel Time-Based Output Sequencer
• I2C/SMBus Serial Interface
• Powered from 6V to 14V
• LTC2975 Available in 64-Lead QFN Package

More information

• Datasheet
• IC product information