LTC Intros LTC2925 Power Supply Tracking Controller

Linear Technology Corp. (LTC, Milpitas, CA) introduced its LTC2925, a power supply tracking controller that provides a variety of power-up and power-down profiles for systems with up to four supplies. By configuring a few resistors, the IC ramps the supplies up and down together with voltage offsets, time delays or different ramp rates. The LTC2925 is suitable for multiple power supply system applications, such as servers, base stations, storage area networks and central office applications.

The LTC2925 features power-up timeout circuitry that turns off the supplies if an external voltage monitor fails to indicate that all supplies have entered regulation within a specified time-out period. With its power supply tracking and sequencing capabilities, the IC introduces currents into the feedback nodes of independent supplies causing their outputs to track without inserting any pass element losses. A single LTC2925 controls three of the four supplies without a series MOSFET. For systems that require a fourth supply, or when a supply does not allow direct access to its feedback resistors, a series FET controls the fourth.

The LTC2925 is available in 24-pin SSOP and 24-lead DFN packages. Pricing starts at $3.75 each for 1,000-piece quantities.