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  2. Power Management
  3. Switching Regulators
  4. DDR/QDR Memory Bus Termination
  5. LTC3717

Data Sheet
User Guides
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Overview

Features and Benefits

  • VOUT = 1/2 VIN (Supply Splitter)
  • Adjustable and Symmetrical Sink/Source Current Limit up to 20A
  • ±0.65% Output Voltage Accuracy
  • Up to 97% Efficiency
  • No Sense Resistor Required
  • Ultrafast Transient Response
  • True Current Mode Control
  • 2% to 90% Duty Cycle at 200kHz
  • tON(MIN) ≤ 100ns
  • Stable with Ceramic COUT
  • Dual N-Channel MOSFET Synchronous Drive
  • Power Good Output Voltage Monitor
  • Wide VCC Range: 4V to 36V
  • Adjustable Switching Frequency up to 1.5MHz
  • Output Overvoltage Protection
  • Optional Short-Circuit Shutdown Timer
  • Available in a 16-Pin Narrow SSOP Package

Product Details

The LTC3717 is a synchronous step-down switching regulator controller for double data rate (DDR) and Quad Data Rate™ (QDR™) memory termination. The controller uses a valley current control architecture to deliver very low duty cycles without requiring a sense resistor. Operating frequency is selected by an external resistor and is compensated for variations in VIN.

Forced continuous operation reduces noise and RF interference. Output voltage is internally set to half of VREF, which is user programmable.

Fault protection is provided by an output overvoltage comparator and optional short-circuit shutdown timer. Soft-start capability for supply sequencing is accomplished using an external timing capacitor. The regulator current limit level is symmetrical and user programmable. Wide supply range allows operation from 4V to 36V at the VCC input.

Von Pin Package
LTC3717 No SSOP-16
LTC3717-1 Yes QFN-32

Applications

  • Bus Termination: DDR and QDR Memory, SSTL, HSTL, ...
  • Notebook Computers, Desktop Servers
  • Tracking Power Supply

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At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

Documentation & Resources

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  • Data Sheets (1)
  • Reliability Data (1)
  • User Guides (1)
  • Design Notes (2)
  • Technical Articles (1)
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    LTC3717
    LTC3717-1

    Product Recommendations

    LTC3717 Companion Parts

    Recommended µModule Regulator

    Recommended Related Parts

    Design Resources

    ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

    Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
    LTC3717EGN#PBF Material Declaration Reliability Data 16-Lead SSOP (Narrow 0.15 Inch)
    LTC3717EGN#TRPBF Material Declaration Reliability Data 16-Lead SSOP (Narrow 0.15 Inch)
    Wafer Fabrication Data R384 Reliability Data

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    Select Model for PCN Information
    • LTC3717EGN#PBF Production
    • LTC3717EGN#TRPBF Production

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