LTC3717

PRODUCTION

LTC3717

Wide Operating Range, No R_SENSE^™ Step-Down Controller for DDR/QDR Memory Termination

PRODUCTION

Part Details

Figure 1. High Efficiency DDR Memory Termination Supply slide

Figure 1. High Efficiency DDR Memory Termination Supply

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1ku List Price Starting From $3.54

Features

V_OUT = 1/2 V_IN (Supply Splitter)
Adjustable and Symmetrical Sink/Source Current Limit up to 20A
±0.65% Output Voltage Accuracy
Up to 97% Efficiency
No Sense Resistor Required
Ultrafast Transient Response
True Current Mode Control
2% to 90% Duty Cycle at 200kHz
t_ON(MIN) ≤ 100ns
Stable with Ceramic C_OUT
Dual N-Channel MOSFET Synchronous Drive
Power Good Output Voltage Monitor
Wide V_CC Range: 4V to 36V
Adjustable Switching Frequency up to 1.5MHz
Output Overvoltage Protection
Optional Short-Circuit Shutdown Timer
Available in a 16-Pin Narrow SSOP Package

Additional Details

The LTC3717 is a synchronous step-down switching regulator controller for double data rate (DDR) and Quad Data Rate^™ (QDR^™) memory termination. The controller uses a valley current control architecture to deliver very low duty cycles without requiring a sense resistor. Operating frequency is selected by an external resistor and is compensated for variations in V_IN.

Forced continuous operation reduces noise and RF interference. Output voltage is internally set to half of V_REF, which is user programmable.

Fault protection is provided by an output overvoltage comparator and optional short-circuit shutdown timer. Soft-start capability for supply sequencing is accomplished using an external timing capacitor. The regulator current limit level is symmetrical and user programmable. Wide supply range allows operation from 4V to 36V at the V_CC input.


	Von Pin	Package
LTC3717	No	SSOP-16
LTC3717-1	Yes	QFN-32

Applications

Bus Termination: DDR and QDR Memory, SSTL, HSTL, ...
Notebook Computers, Desktop Servers
Tracking Power Supply

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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 2

1ku List Price Starting From $3.54

Documentation

Technical Documents 5

LTC3717: Wide Operating Range, No RSENSE Step-Down Controller for DDR/QDR Memory Termination Data Sheet 11/01/2010

R384 Reliability Data 03/26/2018

DC450A - Demo Manual 09/24/2009

Design Solutions 43 - High Performance Switch Mode Power Solutions for Altera Low Voltage FPGAs 08/21/2007

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

Design Resources 2

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
LTC3717EGN#PBF	16-Lead SSOP (Narrow 0.15 Inch)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3717EGN#TRPBF	16-Lead SSOP (Narrow 0.15 Inch)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LTC3717EGN#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

LTC3717EGN#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

LTC3717EGN#PBF

PRODUCTION

LTC3717EGN#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]

LTC3717EGN#PBF

PRODUCTION

LTC3717EGN#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

LTC3717EGN#PBF

PRODUCTION

LTC3717EGN#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]

LTC3717EGN#PBF

PRODUCTION

LTC3717EGN#TRPBF

PRODUCTION

pdf

PCN22_0066_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

Software & Part Ecosystem

Companion Parts 2

Parts	Product Life Cycle	Description
DDR/QDR Memory Bus Termination1
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

Evaluation Kit

DC450A

LTC3717EGN | DDR, HSTL, STTL Termination Power Supply, 5V-20VIN, VREF/2 @ 12A

DC450A

LTC3717EGN | DDR, HSTL, STTL Termination Power Supply, 5V-20VIN, VREF/2 @ 12A

Buy Now View Details

Product Detail

DC450A: Demo Board for LTC3717 Wide Operating Range, No R_SENSE Step-Down Controller for DDR/QDR Memory Termination.

Resources

ZIP

DC450A - Design File

1.00M

PDF

DC450A - Demo Manual

491.00K

PDF

DC450A - Schematic

105.00K

DC450A

LTC3717EGN | DDR, HSTL, STTL Termination Power Supply, 5V-20VIN, VREF/2 @ 12A

Tools & Simulations

LTspice 1

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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.