LTC3717-1

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 VREF
  • Adjustable and Symmetrical Sink/Source Current Limit up to 20A
  • True Current Mode Control with Optional Use of Sense Resistor
  • VON and ION 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
  • tON(MIN) ≤ 100ns
  • Stable with Ceramic COUT
  • Power Good Output Voltage Monitor
  • Wide VIN 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 VIN and VOUT.

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/Margining Power Supply
LTC3717-1
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

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.

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