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  2. Power Management
  3. Switching Regulators
  4. DDR/QDR Memory Bus Termination
  5. LTC3718

Data Sheet
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User Guides
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Overview

Features and Benefits

  • Very Low VIN(MIN): 1.5V
  • Ultrafast Transient Response
  • True Current Mode Control
  • 5V Drive for N-Channel MOSFETs Eliminates Auxillary 5V Supply
  • No Sense Resistor Required
  • Uses Standard 5V Logic-Level N-Channel MOSFETs
  • VOUT(MIN): 0.4V
  • VOUT Tracks 1/2 VIN or External VREF
  • Symmetrical Source and Sink Output Current Limit
  • Adjustable Switching Frequency
  • tON(MIN) <100ns
  • Power Good Output Voltage Monitor
  • Programmable Soft-Start
  • Output Overvoltage Protection
  • Optional Short-Circuit Shutdown Timer
  • Small 24-Lead SSOP Package

Product Details

The LTC3718 is a high current, high efficiency synchronous switching regulator controller for DDR and QDR™ memory termination. It operates from an input as low as 1.5V and provides a regulated output voltage equal to (0.5)VIN. The controller uses a valley current control architecture to enable high frequency operation with very low on-times without requiring a sense resistor. Operating frequency is selected by an external resistor and is compensated for variations in VIN and VOUT. The LTC3718 uses a pair of standard 5V logic level N-channel external MOSFETs, eliminating the need for expensive P-channel or low threshold devices.

Forced continuous operation reduces noise and RF interference. Fault protection is provided by internal foldback current limiting, an output overvoltage comparator and an optional short-circuit timer. Soft-start capability for supply sequencing can be accomplished using an external timing capacitor. OPTI-LOOP® compensation allows the transient response to be optimized over a wide range of loads and output capacitors.

Applications

  • Bus Termination: DDR/QDR Memory, SSTL, HSTL,...
  • Servers, RAID Systems
  • Distributed Power Systems
  • Synchronous Buck with General Purpose Boost

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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 (1)
  • Technical Articles (1)
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    Product Recommendations

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    Design Resources

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    LTC3718EG#PBF Material Declaration Reliability Data 24-Lead SSOP
    LTC3718EG#TRPBF Material Declaration Reliability Data 24-Lead SSOP
    Wafer Fabrication Data R384 Reliability Data

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