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Buck converter supports 4.5-38V input voltage

Posted: 20 Dec 2011 ?? ?Print Version ?Bookmark and Share

Keywords:synchronous step-down? DC/DC controller? buck converter?

Linear Technology Corp. has unveiled a high-efficiency dual output synchronous step-down DC/DC controller. The LTC3876 generates the VDDQ supply voltage that can be programmed from 2.5V down to 1V at up to 25A. The company that it also offers VTT bus termination voltage and VTTR reference voltage for DDR1/DDR2/DDR3 and future standard memory applications.


The LTC3876 is a DC/DC controller with switching frequency programmable up to 2MHz.

According to the company, the output of the first channel produces VDDQ and can be programmed from 2.5V down to 1V at up to 25A. The output of the second channel produces VTT and offers superior load regulation accuracy and efficiency. An internal LDO provides the precision 1.2 percent VTTR reference. Both VTT and VTTR are programmed by an internal resistor divider equal to one-half the VDDQ supply and operate from 1.25-0.5V to support all DDR standards. The VTT supply offers symmetrical output current capability, with 25A (sourcing/sinking) at VTT and 50mA at VTTR.

The LTC3876 operates from an input voltage range of 4.5-38V. The switching frequency is programmable up to 2MHz, allowing the use of very small external components. For noise-sensitive applications, the LTC3876 switching frequency can be synchronized to an external clock. The two channels can be phase shifted at 0, 90, 180 or 270 to reduce input filter components and accommodate multiphase applications with multiple ICs. The LTC3876 uses controlled on-time valley current mode architecture. Additional features include output voltage tracking, programmable soft start, RSENSE or DCR current sense, remote VDDQ sensing and a power good output signal.

For optimal thermal performance, the LTC3876 is available in 38-pin thermally enhanced 5 x 7mm QFN and TSSOP packages. This device is guaranteed for operation from -40C to 125C. 1,000 piece pricing starts at $2.94 each.

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