LTC3717

PRODUCTION

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

Data Sheet Product Selection Table
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Overview

  • VOUT = 1/2 VIN (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
  • tON(MIN) ≤ 100ns
  • Stable with Ceramic COUT
  • Dual N-Channel MOSFET Synchronous Drive
  • Power Good Output Voltage Monitor
  • Wide VCC 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 VIN.

Forced continuous operation reduces noise and RF interference. Output voltage is internally set to half of VREF, 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 VCC 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
LTC3717
Wide Operating Range, No RSENSE™ Step-Down Controller for DDR/QDR Memory Termination
Figure 1. High Efficiency DDR Memory Termination Supply Efficiency vs Load Current Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Design Note 2

Technical Articles 1

Data Sheet

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

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Power System Management (PSM) & Sequencers 1
LTC2974
RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Switching Regulators & Controllers 1
LTM4632
RECOMMENDED FOR NEW DESIGNS Ultrathin, Triple Output, Step-Down μModule Regulator for DDR-QDR4 Memory
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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC3717
  • LTC3717-1
LTspice

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.

Evaluation Kits

eval board
schematic 1
DC450A

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

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Product Details

DC450A: Demo Board for LTC3717 Wide Operating Range, No RSENSE Step-Down Controller for DDR/QDR Memory Termination.
DC450A
LTC3717EGN | DDR, HSTL, STTL Termination Power Supply, 5V-20VIN, VREF/2 @ 12A
DC450A - Schematic

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