1. Products
  2. Power Management
  3. Switching Regulators
  4. Step-Down (Buck) Regulators
  5. External Power Switch Buck Controllers
  6. LTC3709

Data Sheet
JP
User Guides
1 View All

Alternative Parts

LTC3839
LTC3839

Fast, Accurate, 2-Phase, Single-Output Step-Down DC/DC Controller with Differential Output Sensing

Overview

Features and Benefits

  • PolyPhase® Valley Current Mode Controller
  • Synchronizable to an External Clock with PLL
  • Coincident or Ratiometric Tracking
  • Sense Resistor Optional
  • 2% to 90% Duty Cycle at 200kHz
  • tON(MIN) < 100ns
  • True Remote Sensing Differential Amplifier
  • High Efficiency at Both Light and Heavy Loads
  • Power Good Output Voltage Monitor
  • 0.6V ±1% Reference
  • Adjustable Current Limit
  • Programmable Soft-Start and Operating Frequency
  • Output Overvoltage Protection
  • Optional Short-Circuit Shutdown Timer
  • 32-Lead (5mm × 5mm) QFN Package

Product Details

The LTC3709 is a single output, dual phase, synchronous step-down switching regulator. The controller uses a constant on-time, 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 input supply voltage. An internal phase-locked loop allows the LTC3709 to be synchronized to an external clock.

A TRACK pin is provided for tracking or sequencing the output voltage among several LTC3709 chips or an LTC3709 and other DC/DC regulators. Soft-start is accomplished using an external timing capacitor.

Fault protection is provided by an output overvoltage comparator and an optional short-circuit shutdown timer. The current limit level is user programmable. A wide supply range allows voltages as high as 31V to step down to 0.6V.

Protected by U.S. Patents, including 5481178, 6476589, 6144194, 5847554, 6177678, 6304066, 6580258, 6674274, 6462525, 6593724.

Applications

  • Notebook Computers
  • Power Supply for DSP, ASIC, Graphic Processors

Product Categories

Comparable Parts Click to see all in Parametric Search

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

Documentation & Resources

  • View All (4)
  • Data Sheets (1)
  • Reliability Data (1)
  • User Guides (1)
  • Technical Articles (1)
    • Document Type

    Tools & Simulations

    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.

    LTspice

    Models for the following parts are available in LTspice:

    LTC3709

    Product Recommendations

    LTC3709 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
    LTC3709EG#PBF Material Declaration Reliability Data 24-Lead SSOP
    LTC3709EG#TRPBF Material Declaration Reliability Data 24-Lead SSOP
    LTC3709EUH#PBF Material Declaration Reliability Data 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)
    LTC3709EUH#TRPBF Material Declaration Reliability Data 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)
    Wafer Fabrication Data R384 Reliability Data

    PCN-PDN Information

    Select a model from the dropdown below to subscribe to PCN/PDN notifications and view past notifications as well.

    Select Model for PCN Information
    • LTC3709EG#PBF Production
    • LTC3709EG#TRPBF Production
    • LTC3709EUH#PBF Production
    • LTC3709EUH#TRPBF Production

    Support & Discussions

    LTC3709 Contact ADI Technical Support »
    LTC3709 Ask your question »
    LTC3709 Contact ADI Technical Support » LTC3709 Ask your question »

    Sample & Buy


    Ordering FAQs


    See our Ordering FAQs for answers to questions about online orders, payment options and more.

     

    Buy Now Pricing


    (**) Displayed Buy Now Price and Price Range is based on small quantity orders.

     

    List Pricing


    (*)The 1Ku list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

     

    Lead Times


    Please see the latest communication from our CCO regarding lead times.

     

    Sampling


    Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.


    Price Table Help

     

    Evaluation Boards

    Pricing displayed is based on 1-piece.

    Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

    Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

    •