LTC3717-1

PRODUCTION

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

Part Models: 2
1ku List Price: Starting From $4.21

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Part Details

V_OUT = 1/2 V_REF
Adjustable and Symmetrical Sink/Source Current Limit up to 20A
True Current Mode Control with Optional Use of Sense Resistor
V_ON and I_ON Pins Allow Constant Frequency Operation During Input and Output Voltage Changes
±0.65% Output Voltage Accuracy
Up to 97% Efficiency
Ultrafast Transient Response
2% to 90% Duty Cycle at 200kHz
t_ON(MIN) ≤ 100ns
Stable with Ceramic C_OUT
Power Good Output Voltage Monitor
Wide V_IN Range: 4V to 36V
Adjustable Switching Frequency up to 1.5MHz
Output Overvoltage Protection
Optional Short-Circuit Shutdown Timer
Available in a 5mm × 5mm QFN Package

The LTC3717-1 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 with or without a sense resistor. Operating frequency is selected by an external resistor and is compensated for variations in V_IN and V_OUT.

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/Margining Power Supply

Part Models: 2
1ku List Price: Starting From $4.21

Documentation

Data Sheet 1

LTC3717-1: Wide Operating Range, No RSENSE Step-Down Controller for DDR/QDR Memory Termination Data Sheet 11/17/2010

Reliability Data 1

R384 Reliability Data 03/26/2018

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
LTC3717EUH-1#PBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3717EUH-1#TRPBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

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

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.

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