1. Products
  2. Power Management
  3. Switching Regulators
  4. DDR/QDR Memory Bus Termination
  5. LTC3831-1


Features and Benefits

  • VOUT as Low as 0.4V
  • High Power Switching Regulator Controller for DDR Memory Termination
  • VOUT Tracks 1/2 of VIN or External VREF
  • No Current Sense Resistor Required
  • Low VCC Supply: 3V to 8V
  • Maximum Duty Cycle > 91% Over Temperature
  • Drives All N-Channel External MOSFETs
  • High Efficiency: Up to 95%
  • Programmable Fixed Frequency Operation: 100kHz to 500kHz
  • External Clock Synchronization Operation
  • Programmable Soft-Start
  • Low Shutdown Current: <10µA
  • Overtemperature Protection
  • Available in 16-Pin Narrow SSOP Package

Product Details

The LTC3831-1 is a high power, high efficiency switching regulator controller designed for DDR memory termination. The LTC3831-1 generates an output voltage equal to 1/2 of an external supply or reference voltage. The LTC3831-1 uses a synchronous switching architecture with N-channel MOSFETs. Additionally, the chip senses output current through the drain-source resistance of the upper N-channel FET, providing an adjustable current limit without a current sense resistor.

The LTC3831-1 operates with input supply voltage as low as 3V and with a maximum duty cycle of >91%. It includes a fixed frequency PWM oscillator for low output ripple operation. The 300kHz free-running clock frequency can be externally adjusted or synchronized with an external signal from 100kHz to above 500kHz. In shutdown mode, the LTC3831-1 supply current drops to <10µA.

Feedback Voltage Accuracy Over Temp
LTC3831 1.25V 1.5%
LTC3831-1 0.75V 1.6%


  • DDR SDRAM Termination
  • SSTL_2, SSTL_3 Interface
  • HSTL Interface

Product Lifecycle icon-recommended Production

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.

Tools & Simulations


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Product Recommendations

LTC3831-1 Companion Parts

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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
LTC3831EGN-1#PBF Material Declaration Reliability Data 16-Lead SSOP (Narrow 0.15 Inch)
LTC3831EGN-1#TRPBF Material Declaration Reliability Data 16-Lead SSOP (Narrow 0.15 Inch)
Wafer Fabrication Data R320 Reliability Data

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Sample & Buy

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Buy Now Pricing

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List Pricing

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Lead Times

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