LTC3831

PRODUCTION

LTC3831

High Power Synchronous Switching Regulator Controller for DDR Memory Termination

PRODUCTION

Figure 1. Typical DDR Memory Termination Application slide

Figure 1. Typical DDR Memory Termination Application

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Part Models 4

1ku List Price Starting From $3.49

Features

High Power Switching Regulator Controller for DDR Memory Termination
V_OUT Tracks 1/2 of V_IN or External V_REF
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

Additional Details

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%

Applications

DDR SDRAM Termination
SSTL_2 Interface
SSTL_3 Interface

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Ask a Question

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Support

Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.

Visit the ADI Support Page

Ask the ADI community for help.

Ask the EngineerZone Community

FAQs

Sales & Ordering FAQs

Part Models 4

1ku List Price Starting From $3.49

Technical Documents 4

LTC3831: High Power Synchronous Switching Regulator Controller for DDR Memory Termination Data Sheet 09/15/2008

R320 Reliability Data 03/23/2018

DC470A - Demo Manual 09/24/2009

Design Note 281: Wide Input Range, High Efficiency DDR Termination Power Supply Achieves Fast Transient Response 04/01/2002

Design Resources 4

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 Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC3831EGN#PBF	16-Lead SSOP (Narrow 0.15 Inch)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3831EGN#TRPBF	16-Lead SSOP (Narrow 0.15 Inch)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3831IGN#PBF	16-Lead SSOP (Narrow 0.15 Inch)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3831IGN#TRPBF	16-Lead SSOP (Narrow 0.15 Inch)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LTC3831EGN#PBF
Pin/Package Drawing
16-Lead SSOP (Narrow 0.15 Inch)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC3831EGN#TRPBF
Pin/Package Drawing
16-Lead SSOP (Narrow 0.15 Inch)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC3831IGN#PBF
Pin/Package Drawing
16-Lead SSOP (Narrow 0.15 Inch)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC3831IGN#TRPBF
Pin/Package Drawing
16-Lead SSOP (Narrow 0.15 Inch)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

PCN/PDN Information

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Part Models

Product Lifecycle

PCN

Oct 11, 2022

- 22_0235

Epoxy Change from Henkel 8290 to 8290A for GN Package

LTC3831EGN#PBF

PRODUCTION

LTC3831EGN#TRPBF

PRODUCTION

LTC3831IGN#PBF

PRODUCTION

LTC3831IGN#TRPBF

PRODUCTION

pdf

PCN22_0235_Form

xls

Material_Report

pdf

Qualification Results Summary

xlsm

Delta Qualification Matrix

Apr 6, 2022

- 22_0066

Laser Top Mark for 16QSOP Assembled in ADPG [PNG]

LTC3831EGN#PBF

PRODUCTION

LTC3831EGN#TRPBF

PRODUCTION

LTC3831IGN#PBF

PRODUCTION

LTC3831IGN#TRPBF

PRODUCTION

pdf

PCN22_0066_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

Filter by Model

Part Models

Product Lifecycle

PCN

Oct 11, 2022

- 22_0235

Epoxy Change from Henkel 8290 to 8290A for GN Package

LTC3831EGN#PBF

PRODUCTION

LTC3831EGN#TRPBF

PRODUCTION

LTC3831IGN#PBF

PRODUCTION

LTC3831IGN#TRPBF

PRODUCTION

pdf

PCN22_0235_Form

xls

Material_Report

pdf

Qualification Results Summary

xlsm

Delta Qualification Matrix

Apr 6, 2022

- 22_0066

Laser Top Mark for 16QSOP Assembled in ADPG [PNG]

LTC3831EGN#PBF

PRODUCTION

LTC3831EGN#TRPBF

PRODUCTION

LTC3831IGN#PBF

PRODUCTION

LTC3831IGN#TRPBF

PRODUCTION

pdf

PCN22_0066_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

Companion Parts 4

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LTM4632	RECOMMENDED FOR NEW DESIGNS	Ultrathin, Triple Output, Step-Down μModule Regulator for DDR-QDR4 Memory
Digital Power System Managers1
LTC2974	RECOMMENDED FOR NEW DESIGNS	4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Silicon Oscillators2
LTC6908		Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation
LTC6909	PRODUCTION	1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation

DC470A

LTC3831EGN | High Efficiency Termination/Tracking Power Supply, 3V~8VIN, VREF/2 @ 12A

DC470A

LTC3831EGN | High Efficiency Termination/Tracking Power Supply, 3V~8VIN, VREF/2 @ 12A

Buy Now View Details

Product Detail

DC470A: Demo Board for LTC3831 High Power Synchronous Switching Regulator Controller for DDR Memory Termination.

Resources

ZIP

DC470A - Design File

1.00M

PDF

DC470A - Schematic

22.00K

PDF

DC470A - Demo Manual

490.00K

DC470A

LTC3831EGN | High Efficiency Termination/Tracking Power Supply, 3V~8VIN, VREF/2 @ 12A

LTspice 1

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