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Linear Tech step-down controller powers Sun processors

Posted: 14 Dec 2005 ?? ?Print Version ?Bookmark and Share

Keywords:Linear Technology? LTC3819? step-down controller? MOSFET driver?

Linear Technology Corp. introduced the LTC3819, a PolyPhase synchronous step-down controller with integrated MOSFET drivers and an on-board 5-bit digital interface designed to power Sun Microsystems' new generation of processors.

The new controller offers a 45A single-chip solution, integrating four MOSFET drivers with substantial gate drive capability. PolyPhase operation minimizes the requirement for input and output capacitors. The LTC3819 has two power sections that accurately balance the output power between the power components. This precision current sharing reduces thermal stress, increasing the reliability of MOSFETs, inductors and capacitors. Furthermore, it facilitates thermal management, eliminating hot spots and the need for heat sinks.

The LTC3819's 5-bit VID code corresponds to the core voltage range of Sun's new processors. Core voltage range is from 1.025V to 1.4125V in 12.5mV steps and core current can range from 15A to 40A. The LTC3819 can deliver this power at up to 90 percent efficiency from an input voltage source ranging from 4.5V to 36V. The IC's accurate current sensing typically provides less than 2 percent IOUT error between the two channels. The LTC3819 includes protection functions such as current foldback, short-circuit shutdown and an overvoltage soft latch.

Housed in a 36-lead SSOP package, the LTC3819 is guaranteed for operation from -400C to 850C temperature range. Pricing for the 1,000-piece quantity starts at $4.35 each.

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Related Datasheets
Part Number Description Category
? LTC3819 2-Phase, High Efficiency, Step-Down Controller for Sun Server CPUs ICs, Interface



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