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


LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.


Models for the following parts are available in LTspice:


Product Recommendations

LTC3831-1 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.

Support & Discussions

LTC3831-1 Discussions

RE: ADM2587E connects 32 nodes
3 day(s) ago in Interface and Isolation
RE: AD9364 Tx Image
3 day(s) ago in Design Support AD9361/AD9363/AD9364

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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

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