DEMO MANUAL DC2578A LTC4281, LTC3886, LTC2975, LTC3887 Total Power Management: Hot Swap, Intermediate Bus, Point-of-Load BOARD FEATURES n n Complete Power Tree from Input Hot Swap to Point- LTpowerPlay PC GUI Software n of-Load Linduino Firmware Platform Support n n Hot Swap Controller for Input Power Safety and Powered from 12V/1A Wall Supply Telemetry (LTC 4281) n Table 1. DC2578A Board Parameters Intermediate Bus Controller for Precise, Complete PARAMETER MIN TYP MAX Power Control Over Two Separate Buses (LTC3886) n Point-of-Load Managers/Controllers Cooperatively V 11V 12V 13.8V IN Sequence, Manage, Measure, and Manage Faults on Output Power 10W (Total Over All Outputs) All Output Supplies (LTC2975 and LTC3887) Ambient Temperature 0C 25C 60C n Built-In Load Step Generator for Transient Response Tuning 2 n I C/SMBus/PMBus Compatible Interface for Com- Design files for this circuit board are available at plete Control and Read Back of Telemetry, Including DEMO MANUAL DC2578A BOARD FEATURES Table 2. Channel Capabilities PARAMETER HOT SWAP IBV 8V, IBV 5V CH0, CH1 CH2 TO CH5 Manager/Controller LTC4281 LTC3886 LTC3887 LTC2975 Nominal Channel Output Voltage 12V, V = V 8V, 5V 2.5V, 2V 1.8V, 1.5V, 1.2V, 1V OUT IN (Defined by Config) (Defined by Config) Configured Voltage Trim Range N/A 5% 5% 5% Output Current Limit (Configured) 1A 4A 2.5A 2A Load Pulser Current N/A 1A on IBV 8V N/A N/A Temperature Monitor N/A 1 Internal, 1 Internal, 1 Internal, 2 External* 2 External* 4 External* *External temperature sensors are located near each inductor. DESCRIPTION The DC2578A is a complete power chain, including a and showcases how easy it is to configure and manage hot swap controller, an intermediate bus controller, and the whole power hierarchy. Each regulated supply has the six point-of-load channels with power system manage- ability to sequence, trim, margin, supervise, measure, ment. The board demonstrates how to safely transfer respond cooperatively to faults, and log fault informa- power from a backplane, through an LTC4281 hot swap tion in nonvolatile memory. In addition, the onboard load controller, through an LTC3886 step-down intermediate pulser helps with optimizing the adjustable LTC3886 con- bus controller (IBC), and out through the point-of-load trol loop response. The rich set of status and telemetry converters (POLs) that regulate load voltages. It shows information provided by the entire system is consolidated the comprehensive set of power management, coopera- and presented under one GUI interface LTpowerPlay. tion, and safety features of the Analog Devices solution, Figure 2. DC2578A Board Layout dc2578af 2