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  6. LTC3852

Data Sheet
PDF
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Overview

Features and Benefits

  • Charge Pump Input Range: 2.7V to 5.5V
  • Controller Input Range: 4V to 38V
  • Integrated Charge Pump Provides 5V Gate Drive to Logic Level MOSFETs
  • RSENSE or DCR Current Sensing
  • ±1.25% Output Voltage Accuracy Over Temperature
  • Phase-Lockable Fixed Frequency: 250kHz to 750kHz
  • Power Good Output Voltage Monitor
  • Adjustable Soft-Start Voltage Ramping
  • Current Foldback Disabled During Start-Up
  • No Reverse Current During Soft-Start
  • Selectable Constant Frequency, Pulse-Skipping, or Burst Mode Operation
  • Output Overvoltage Protection
  • Very Low Dropout Operation: 99% Duty Cycle
  • Available in a 24-Lead (3mm × 5mm) QFN Package

Product Details

The LTC3852 is a constant frequency, current mode step-down DC/DC controller which can be powered by an on-board charge pump. Input supplies as low as 2.7V, when doubled by the charge pump, provide 5V to the LTC3852’s control logic and gate drives, supporting a wide selection of logic-level N-channel power MOSFETs.

The constant-frequency current mode architecture allows for a phase-lockable fixed frequency of up to 750kHz. The RUN pin provides a precision enable threshold while the TRACK/SS pin combines tracking and adjustable soft-start features.

The MODE/PLLIN pin selects among Burst Mode® operation, pulse-skipping mode, and continuous current mode. Current foldback limits MOSFET power dissipation during short-circuit conditions. Reverse current and current foldback functions are disabled during soft-start. A power good output pin indicates when the output is within ±10% of its designed set point.

Applications

  • General Purpose 3.3V Systems
  • Lithium-Ion Powered Devices
  • Distributed DC Power Systems

Product Categories

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This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits (1)

Documentation & Resources

  • View All (3)
  • Data Sheets (1)
  • Reliability Data (1)
  • User Guides (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

    LTC3852 Demo Circuit - Low Input Voltage, Synchronous Step-Down Controller (3.3V to 1.5V@15A)

    Models for the following parts are available in LTspice:

    LTC3852

    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

    LTC3852 Project - 2.7-5.5Vin to 1.5V/15A, 400kHz, Rsense

    Design tools for the following parts are available in LTpowerCAD:

    LTC3852

    Product Recommendations

    LTC3852 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
    LTC3852EUDD#PBF Material Declaration Reliability Data 24-Lead QFN (3mm x 5mm x 0.75mm w/ EP)
    LTC3852EUDD#TRPBF Material Declaration Reliability Data 24-Lead QFN (3mm x 5mm x 0.75mm w/ EP)
    LTC3852IUDD#PBF Material Declaration Reliability Data 24-Lead QFN (3mm x 5mm x 0.75mm w/ EP)
    LTC3852IUDD#TRPBF Material Declaration Reliability Data 24-Lead QFN (3mm x 5mm 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
    • LTC3852EUDD#PBF Production
    • LTC3852EUDD#TRPBF Production
    • LTC3852IUDD#PBF Production
    • LTC3852IUDD#TRPBF Production

    Support & Discussions

    LTC3852 Contact ADI Technical Support »
    LTC3852 Ask your question »
    LTC3852 Contact ADI Technical Support » LTC3852 Ask your question »

    Sample & Buy


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    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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