Features and Benefits

  • DDR Power Supply, Termination and Reference
  • High Efficiency: Up to 94%
  • Dual Outputs with ±3A Output Current Capability
  • 2.25V to 5.5V Input Voltage Range
  • ±1% Output Voltage Accuracy
  • VTT Output Voltage Down to 0.5V
  • Shutdown Current ≤1μA
  • Adjustable Switching Frequency Up to 4MHz
  • Internal or External Compensation
  • Selectable 0°/90°/180° Phase Shift Between Channels
  • Internal or External Soft-Start for VDDQ, Internal Soft-Start for VTT
  • Power Good Status Outputs
  • Low Profile 4mm × 4mm QFN-24 and TSSOP-24 Packages

Product Details

The LTC3618 is a dual synchronous step-down regulator using a current mode, constant-frequency architecture. It provides a complete DDR solution with an input voltage range from 2.25V to 5.5V.

The output of the first step-down regulator offers a high accuracy VDDQ supply. A buffered reference generates VTTR at 50% of VDDQIN and drives loads up to ±10mA. The second regulator generates the DDR termination voltage (VTT) equal to VTTR. Both regulators are capable of delivering ±3A of load current at 1MHz switching frequency.

The operating frequency is externally programmable up to 4MHz, allowing the use of small surface mount inductors. 0°, 90°, or 180° of phase shift between the two channels can be selected to minimize input current ripple. For switching noise-sensitive applications, the LTC3618 can be synchronized to an external clock up to 4MHz.

The LTC3618 is offered in leadless 24-pin 4mm × 4mm QFN and thermally enhanced 24-pin TSSOP packages.


  • DDR Memory
  • Supports DDR, DDR2, and DDR3 Standards
  • Tracking Supplies

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits (1)

Tools & Simulations


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Reference Designs (2)

Product Recommendations

LTC3618 Companion Parts

Recommended µModule Regulator

Recommended Related Parts

Recommended Suggested Oscillator

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.

PCN-PDN Information

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Evaluation Boards

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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.