Dual synchronous buck controller provides complete DDR power solution
December 16, 2011 // Paul Buckley
Linear Technology Corporation has introduced the LTC3876, a high-efficiency dual output synchronous step-down DC/DC controller that generates the VDDQ supply voltage, the VTT bus termination voltage and the VTTR reference voltage for DDR1/DDR2/DDR3 and future standard memory applications.
The output of the LTC3876's first channel produces VDDQ and can be programmed from 2.5 V down to 1 V at up to 25 A. The output of the second channel produces VTT and offers superior load regulation accuracy and efficiency.
An internal LDO provides the precision ±1.2% 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 V to 0.5 V to support all DDR standards. The VTT supply offers symmetrical output current capability, with ±25 A (sourcing/sinking) at VTT and ±50 mA at VTTR.
The LTC3876 operates from an input voltage range of 4.5 V to 38 V. The switching frequency is programmable up to 2 MHz 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 multi-phase applications with multiple ICs.
The LTC3876 utilizes a controlled on-time valley current mode architecture. Additional features include output voltage tracking, programmable soft start, R SENSE 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 mm x 7 mm QFN and TSSOP packages.
For further information: www.linear.com/product/LTC3876.
Benchmark Stresses Big Chips
February 28, 2015
The Embedded Microprocessor Benchmark Consortium (EEMBC), a trade group of 47 chip and system designers, released CoreMark-Pro. ...
Consortium releases digital point-of-load specification
Can flow battery advance lower urban power costs?
Switch to LED lighting cuts cruising energy costs by 60 percent
Semitrex' ultimate goal: "one size fits all" power conversion
Porsche rainmaker advocates platooning
February 26, 2015
Individual mobility as our fathers knew it gets increasingly challenged. Traffic density, pollutant emissions and other ecologic ...
Radar-based sensor network helps drivers finding a parking spot
Xilinx flexes its muscles in the ADAS arena
The future of custom ASICs
- Software-Defined Radio Handbook
- A Four-Quadrant DC/DC Switching Regulator Smoothly Transitions from Positive to Negative Output Voltages for FPGA and Other Applications
- LED Driver with Integrated Spread Spectrum Reduces EMI without Adding Flicker
- Accelerate SDN and NFV with Off-the-Shelf Software
InterviewInfineon: CAN FD success goes at the expense of FlexRay
The faster version of the venerable CAN bus, CAN FD is currently taking off at several carmakers. Infineon's Thomas Böhm, Head of Body / Automotive, believes this could well go at the expense of FlexRay. ...
Filter WizardCheck out the Filter Wizard Series of articles by Filter Guru Kendall Castor-Perry which provide invaluable practical Analog Design guidelines.
Linear video channel
READER OFFERRead more
To ensure you have a good start in 2015, Freescale is giving away five of its QorIQ TWR-LS1021A Tower system modules, worth USD269 each, for EETimes Europe's readers to win.
The module is the most feature-rich and high-performance Tower system offered by Freescale, enabling compatibility and interoperability with the growing list of Tower expansion modules, offering an easily accessible...MORE INFO AND LAST MONTH' WINNERS...
December 15, 2011 | Texas instruments | 222901974
Unique Ser/Des technology supports encrypted video and audio content with full duplex bi-directional control channel over a single wire interface.