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  4. Step-Down (Buck) Regulators
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  6. LTC3603

Data Sheet
JP
User Guides
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Alternative Parts

LTC3604
LTC3604

2.5A, 15V Monolithic Synchronous Step-Down Regulator

Overview

Features and Benefits

  • Wide Input Voltage Range: 4.5V to 15V
  • 2.5A Output Current
  • Low RDS(ON) Internal Switches: 45mΩ and 85mΩ
  • Programmable Frequency: 300kHz to 3MHz
  • Low Quiescent Current: 75μA
  • 0.6V ±1% Reference Allows Precise,
  • Low Output Voltage
  • 99% Maximum Duty Cycle
  • Adjustable Burst Mode® Clamp
  • Synchronizable to External Clock
  • Power Good Output Voltage Monitor
  • Overtemperature Protection
  • Overvoltage Protection
  • Available in 16-Lead Thermally Enhanced MSOP and 4mm × 4mm QFN Packages

Product Details

The LTC3603 is a high efficiency, monolithic synchronous step-down DC/DC converter utilizing a constant-frequency, current mode architecture. It operates from an input voltage range of 4.5V to 15V and provides an adjustable regulated output voltage from 0.6V to 14.5V while delivering up to 2.5A of output current. The internal synchronous power switch with 45mΩ on-resistance increases efficiency and eliminates the need for an external Schottky diode. The switching frequency can either be set by an external resistor or synchronized to an external clock. OPTI-LOOP® compensation allows the transient response to be optimized over a wide range of loads and output capacitors.

The LTC3603 can be configured for either Burst Mode operation or forced continuous operation. Forced continuous operation reduces noise and RF interference, while Burst Mode operation provides the highest efficiency at light loads. In Burst Mode operation, external control of the burst clamp level allows the output voltage ripple to be adjusted according to the requirements of the application.

Applications

  • Point-of-Load Supplies
  • Portable Instruments
  • Communications Infrastructure

Product Categories

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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 (2)

Documentation & Resources

  • View All (5)
  • Data Sheets (1)
  • Reliability Data (1)
  • User Guides (2)
  • Press Releases (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.

    To launch ready-to-run LTspice demonstration circuits for this part:

    Step 1: Download and install LTspice on your computer.

    Step 2: Click on the link in the section below to download a demonstration circuit.

    Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

    LTspice

    LTspice Simulations

    LTC3603 Demo Circuit - 2.5A, 15V Monolithic Synchronous Step-Down Regulator (4-15V to 1.8V @ 2.5A)

    Models for the following parts are available in LTspice:

    LTC3603

    LTpowerCAD

    LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.

    To open the project file for this circuit:

    Step 1: Download and install LTpowerCAD on your computer.

    Step 2: Click on the link(s) in the section below to download part-specific project files.

    Step 3: If the project file doesn't run, right-click the link and select "Save Target As." Then start the LTpowerCAD tool and open the project file by selecing "Open Project" from the "File" menu.

    LTPowerCAD

    LTpowerCAD Project Files

    LTC3603 Project - 2.5A, 15V Monolithic Buck Regulator (4.5-15V to 3.3V @ 2.5A)
    LTC3603 Project - 2.5A, 15V Monolithic Buck Regulator (4.5-15V to 3.3V @ 2.5A)

    Design tools for the following parts are available in LTpowerCAD:

    LTC3603

    Reference Designs (1)

    Product Recommendations

    LTC3603 Companion Parts

    Recommended Related Parts

    Recommended Suggested Oscillator

    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
    LTC3603EMSE#PBF Material Declaration Reliability Data 16-Lead MSOP w/ EP
    LTC3603EMSE#TRPBF Material Declaration Reliability Data 16-Lead MSOP w/ EP
    LTC3603EUF#PBF Material Declaration Reliability Data 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP)
    LTC3603EUF#TRPBF Material Declaration Reliability Data 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP)
    LTC3603IMSE#PBF Material Declaration Reliability Data 16-Lead MSOP w/ EP
    LTC3603IMSE#TRPBF Material Declaration Reliability Data 16-Lead MSOP w/ EP
    LTC3603IUF#PBF Material Declaration Reliability Data 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP)
    LTC3603IUF#TRPBF Material Declaration Reliability Data 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP)
    Wafer Fabrication Data R526 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
    • LTC3603EMSE#PBF Production
    • LTC3603EMSE#TRPBF Production
    • LTC3603EUF#PBF Production
    • LTC3603EUF#TRPBF Production
    • LTC3603IMSE#PBF Production
    • LTC3603IMSE#TRPBF Production
    • LTC3603IUF#PBF Production
    • LTC3603IUF#TRPBF Production

    Support & Discussions

    LTC3603 Contact ADI Technical Support »
    LTC3603 Ask your question »
    LTC3603 Contact ADI Technical Support » LTC3603 Ask your question »

    Sample & Buy


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    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.

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