LTC3717

PRODUCTION

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

Part Models: 2
1ku List Price: Starting From $3.54

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Part Details

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

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

Part Models: 2
1ku List Price: Starting From $3.54

Documentation

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

Part Models	Product Lifecycle	PCN

Oct 3, 2024 - 24_0235 (QSOP/SSOP PKG) Migrating Bottom Trace Code Marking to Top Side Laser Marking
		PCN24_0235_Form Material_Report Other Delta Qualification Matrix
LTC3717EGN#PBF	PRODUCTION
LTC3717EGN#TRPBF	PRODUCTION
Oct 11, 2022 - 22_0235 Epoxy Change from Henkel 8290 to 8290A for GN Package
		PCN22_0235_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LTC3717EGN#PBF	PRODUCTION
LTC3717EGN#TRPBF	PRODUCTION
Apr 6, 2022 - 22_0066 Laser Top Mark for 16QSOP Assembled in ADPG [PNG]
		PCN22_0066_Form Material_Report Delta Qualification Matrix
LTC3717EGN#PBF	PRODUCTION
LTC3717EGN#TRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Hardware Ecosystem

Parts	Product Life Cycle	Description
DDR/QDR Memory Bus Termination 1
LTM4632	RECOMMENDED FOR NEW DESIGNS	Ultrathin, Triple Output, Step-Down μModule Regulator for DDR-QDR4 Memory
Digital Power System Managers 1
LTC2974	RECOMMENDED FOR NEW DESIGNS	4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement

Tools & Simulations

LTspice 1

LTC3717 - Switching Regulators

Models for the following parts are available in LTspice:

LTC3717
LTC3717-1

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.