Power-Supply Tracker controls up to 4 supplies.
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Press Release Summary:
Available in 24-pin SSOP and 24-lead DFN packages, LTC2925 power-supply tracking controller provides power-up and power-down profiles for systems with up to 4 supplies. By configuring resistors, IC ramps supplies up and down together with voltage offsets, time delays, or different ramp rates. Power-up timeout circuitry turns off supplies if external voltage monitor fails to indicate that all supplies have entered regulation within specified time-out period.
Original Press Release:
Power Supply Tracker Controls up to Four Supplies & Provides Power-Up Timeout
MILPITAS, CA - May 20, 2004 - Linear Technology introduces the 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 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 versatile, yet simple to configure power supply tracking and sequencing capabilities, the LTC2925 ideally suits any application with multiple power supply systems, such as servers, base stations, storage area network and central office applications.
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. When using a FET, an electronic circuit breaker provides protection from short-circuit conditions. An internal remote feedback switch compensates for the voltage drop across the FET and the current sense resistor.
The LTC2925 is available in narrow 24-pin SSOP and tiny 24-lead DFN packages. It is offered in both the commercial and industrial temperature ranges and pricing starts at $3.75 each for 1,000-piece quantities.
Summary of Features: LTC2925
Flexible Power Supply Tracking up & down
Power Supply Sequencing
Supply Stability not Affected
Controls Three Supplies without Series FETs
Controls a Fourth Supply with a Series FET
Remote Sense Switch Compensates for Voltage Drop Across a Series FET
Adjustable Ramp Rates
Electronic Circuit Breaker
Available in Narrow 24-Pin SSOP & Tiny 24-Lead DFN Packages
Company Background
Linear Technology Corporation was founded in 1981 as a manufacturer of high performance linear integrated circuits. Linear Technology products include high performance amplifiers, comparators, voltage references, monolithic filters, linear regulators, DC-DC converters, battery chargers, data converters, communications interface circuits, RF signal conditioning circuits, and many other analog functions. Applications for Linear Technology's high performance circuits include telecommunications, cellular telephones, networking products such as optical switches, notebook and desktop computers, computer peripherals, video/multimedia, industrial instrumentation, security monitoring devices, high-end consumer products such as digital cameras and MP3 players, complex medical devices, automotive electronics, factory automation, process control, and military and space systems.
Note: LT, LTC and are registered trademarks of Linear Technology Corp.
