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  6. LTC1709-7

Data Sheet
PDF
User Guide
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Overview

Features and Benefits

  • Output Stages Operate Antiphase Reducing Input Capacitance Requirements and Power Supply Induced Noise
  • Dual Input Supply Capability for Load Sharing
  • 5-Bit Mobile VID Code: VOUT = 0.925V to 2V
  • Current Mode Control Ensures Current Sharing
  • True Remote Sensing Differential Amplifier
  • Power Good Output Indicator
  • OPTI-LOOP™ Compensation Minimizes COUT
  • Three Operational Modes: PWM, Burst and Cycle Skip
  • Programmable Fixed Frequency: 150kHz to 300kHz
  • ±1% Output Voltage Accuracy
  • Wide VIN Range: 4V to 36V Operation
  • Adjustable Soft-Start Current Ramping
  • Internal Current Foldback and Short-Circuit Shutdown
  • Overvoltage Soft Latch Eliminates Nuisance Trips
  • Active Voltage Positioning Capable
  • Available in 36-Lead Narrow SSOP Package

Product Details

The LTC1709-7 is a 2-phase, VID programmable, synchronous step-down switching regulator controller that drives two all N-channel external power MOSFET stages in a fixed frequency architecture. The 2-phase controller drives its two output stages out of phase at frequencies up to 300kHz to minimize the RMS ripple currents in both input and output capacitors. The 2-phase technique effectively multiplies the fundamental frequency by two, improving transient response while operating each channel at an optimum frequency for efficiency. Thermal design is also simplified.

An operating mode select pin (FCB) can be used to regulate a secondary winding or select among three modes including Burst Mode™ operation for highest efficiency. An internal differential amplifier provides true remote sensing of the regulated supply’s positive and negative output terminals as required in high current applications.

The RUN/SS pin provides soft-start and optional timed, short-circuit shutdown. Current foldback limits MOSFET dissipation during short-circuit conditions when the overcurrent latchoff is disabled. OPTI-LOOP compensation allows the transient response to be optimized for a wide range of output capacitors and ESR values.

Vout Range VRM
LTC1709 1.3V to 3.5V VRM8.4
LTC1709-7 0.925V to 2V Mobile
LTC1709-8 1.3V to 3.5V VRM8.4
LTC1709-85 1.05V to 1.825V VRM8.5
LTC1709-9 1.1V to 1.85V VRM9.0

Applications

  • Mobile/Desktop Computers
  • Internet Servers
  • Large Memory Arrays
  • DC Power Distribution Systems


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Evaluation Kits (1)

Documentation & Resources

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  • Data Sheet (1)
  • Reliability Data (1)
  • User Guide (1)
  • Design Note (2)
  • Technical Article (2)
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    Tools & Simulations

    LTspice

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    LTspice

    Models for the following parts are available in LTspice:

    LTC1709
    LTC1709-7
    LTC1709-8
    LTC1709-85
    LTC1709-9

    Product Recommendations

    LTC1709-7 Companion Parts

    Recommended Related Parts

    Design Resources

    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 Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
    LTC1709EG-7#PBF Material Declaration Reliability Data 36-Lead SSOP
    LTC1709EG-7#TRPBF Material Declaration Reliability Data 36-Lead SSOP
    Wafer Fabrication Data R384 Reliability Data

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    • LTC1709EG-7#PBF Production
    • LTC1709EG-7#TRPBF Production

    Support & Discussions

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