LTC3831 - High Power Synchronous Switching Regulator Controller for DDR Memory Termination

Features

  • High Power Switching Regulator Controller for DDR Memory Termination
  • VOUT Tracks 1/2 of VIN or External VREF
  • No Current Sense Resistor Required
  • Low Input Supply Voltage Range: 3V to 8V
  • Maximum Duty Cycle >91% Over Temperature
  • Drives All N-Channel External MOSFETs
  • High Efficiency: Over 95% Possible
  • 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

Typical Application

LTC3831 Typical Application
LTC3831 Typical Application

Description

The LTC3831 is a high power, high efficiency switching regulator controller designed for DDR memory termination. The LTC3831 generates an output voltage equal to 1/2 of an external supply or reference voltage. The LTC3831 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 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 200kHz free-running clock frequency can be externally adjusted or synchronized with an external signal from 100kHz to above 500kHz. In shutdown mode, the LTC3831 supply current drops to <10µA.

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

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LTC3831EGN#PBF SSOP-16 GN E 05-08-1641 (GN16) Yes
LTC3831EGN#TRPBF SSOP-16 GN E 05-08-1641 (GN16) Yes
LTC3831IGN#PBF SSOP-16 GN I 05-08-1641 (GN16) Yes
LTC3831IGN#TRPBF SSOP-16 GN I 05-08-1641 (GN16) Yes


LTC3831 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LTC3831EGN#PBF SSOP-16 E $3.43 $2.90 Yes
LTC3831EGN#TRPBF SSOP-16 E $2.96 Yes
LTC3831IGN#PBF SSOP-16 I $5.29 $3.70 Yes
LTC3831IGN#TRPBF SSOP-16 I $3.76 Yes
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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 Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC470A LTC3831EGN | High Efficiency Termination/Tracking Power Supply, 3V~8Vin, VREF/2 @ 12A Contact Factory
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Click here to view our complete list of demo boards

Applications

  • DDR SDRAM Termination
  • SSTL_2 Interface
  • SSTL_3 Interface

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

Models for the following parts are available in LTspice:
LTC3831

Technical Support