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  5. External Power Switch Boost Controllers
  6. LTC3897

Data Sheet Rev. A
User Guides
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Overview

Features and Benefits

  • Input Supply Range: 4.5V to 65V (Up to 75V Surge)
  • Reverse Input Protection to –40V
  • In-Rush Current Control, Overcurrent Protection and Output Disconnect for Boost Converter
  • Input Voltage Surge Protection with Adjustable Clamp Voltage
  • Onboard Ideal Diode Controller
  • Low Quiescent Current: 55µA
  • 2-Phase Operation Reduces Required Input and Output Capacitance and Noise
  • Output Voltage Up to 60V
  • Adjustable Gate Drive Level 5V to 10V (OPTI-DRIVE) for Logic-Level or Standard Threshold FETs
  • No External Bootstrap Diodes Required

Product Details

The LTC3897 is a synchronous boost DC/DC controller with surge stopper and ideal diode controller.

The boost controller drives two N-channel power MOSFET stages out-of-phase to reduce input and output capacitor requirements, allowing the use of smaller inductors than the single-phase equivalent. Synchronous rectification reduces power loss and eases thermal requirements.

The surge stopper controls the gate of an external N-channel MOSFET to protect against high voltage input transients and provides in-rush current control, overcurrent protection and output disconnect for the boost converter. The integrated ideal diode controller drives another N-channel MOSFET to replace a Schottky diode for reverse input protection and voltage holdup or peak detection. It controls the forward voltage drop across the MOSFET and minimizes reverse current flow.

The LTC3897 is available in thermally-enhanced 38-pin leadless QFN or 38-lead TSSOP packages.

Applications

  • Industrial
  • Automotive
  • Military/Avionics

Product Categories

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Product Lifecycle icon-recommended Recommended for New Designs

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

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  • Data Sheets (1)
  • Reliability Data (1)
  • User Guides (1)
  • 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.

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    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

    LTC3897 Demo Circuit - 2-Phase Synchronous Boost Converter with Surge Protection and Reverse Protection (16-55V to 48V @ 4A)

    Models for the following parts are available in LTspice:

    LTC3897

    Product Recommendations

    LTC3897 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
    LTC3897EFE#PBF Material Declaration Reliability Data 38-Lead TSSOP w/ EP
    LTC3897EFE#TRPBF Material Declaration Reliability Data 38-Lead TSSOP w/ EP
    LTC3897EUHF#PBF Material Declaration Reliability Data 38-Lead QFN (5mm x 7mm w/ EP)
    LTC3897EUHF#TRPBF Material Declaration Reliability Data 38-Lead QFN (5mm x 7mm w/ EP)
    LTC3897HFE#PBF Material Declaration Reliability Data 38-Lead TSSOP w/ EP
    LTC3897HFE#TRPBF Material Declaration Reliability Data 38-Lead TSSOP w/ EP
    LTC3897HUHF#PBF Material Declaration Reliability Data 38-Lead QFN (5mm x 7mm w/ EP)
    LTC3897HUHF#TRPBF Material Declaration Reliability Data 38-Lead QFN (5mm x 7mm w/ EP)
    LTC3897IFE#PBF Material Declaration Reliability Data 38-Lead TSSOP w/ EP
    LTC3897IFE#TRPBF Material Declaration Reliability Data 38-Lead TSSOP w/ EP
    LTC3897IUHF#PBF Material Declaration Reliability Data 38-Lead QFN (5mm x 7mm w/ EP)
    LTC3897IUHF#TRPBF Material Declaration Reliability Data 38-Lead QFN (5mm x 7mm w/ EP)
    Wafer Fabrication Data R526 Reliability Data

    PCN-PDN Information

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    Select Model for PCN Information
    • LTC3897EFE#PBF Production
    • LTC3897EFE#TRPBF Production
    • LTC3897EUHF#PBF Production
    • LTC3897EUHF#TRPBF Production
    • LTC3897HFE#PBF Production
    • LTC3897HFE#TRPBF Production
    • LTC3897HUHF#PBF Production
    • LTC3897HUHF#TRPBF Production
    • LTC3897IFE#PBF Production
    • LTC3897IFE#TRPBF Production
    • LTC3897IUHF#PBF Production
    • LTC3897IUHF#TRPBF Production

    Support & Discussions

    LTC3897 Discussions

    RE: Variable Voltage boost support for LT1082
    RE: LTC3786 DCDC BOOST PROBLEM
    RE: Where is the missing text in the datasheet LTC3897?
    All LTC3897 Discussions
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