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Alternative Parts

LTC7812
LTC7812

Low IQ, 38V Synchronous Boost+Buck Controller

Overview

Features and Benefits

  • Synchronous Boost and Buck Controllers
  • When Cascaded, Allows VIN Above, Below, or Equal to Regulated VOUT of Up to 60V
  • Wide Bias Input Voltage Range: 4.5V to 60V
  • Output Remains in Regulation Through Input Dips (e.g. Cold Crank) Down to 2.2V
  • Adjustable Gate Drive Level 5V to 10V (OPTI-DRIVE)
  • Low EMI with Low Input and Output Ripple
  • Fast Output Transient Response
  • No External Bootstrap Diodes Required
  • High Light Load Efficiency
  • Low Operating IQ: 29μA (One Channel On)
  • Low Operating IQ: 34μA (Both Channels On)
  • RSENSE or Lossless DCR Current Sensing
  • Buck Output Voltage Range: 0.8V ≤ VOUT ≤ 60V
  • Boost Output Voltage Up 60V
  • Phase-Lockable Frequency (75kHz to 850kHz)
  • Small 32-Pin 5mm × 5mm QFN Package

Product Details

The LTC7813 is a high performance synchronous Boost+Buck DC/DC switching regulator controller that drives all N-channel power MOSFET stages. It contains independent step-up (boost) and step-down (buck) controllers that can regulate two separate outputs or be cascaded to regulate an output voltage from an input voltage that can be above, below, or equal to the output voltage. The LTC7813 operates from a wide 4.5V to 60V input supply range. When biased from the output of the boost regulator, the LTC7813 can operate from an input supply as low as 2.2V after start-up. The 34μA no-load quiescent current (both channels on) extends operating runtime in battery-powered systems.

Unlike conventional buck-boost regulators, the LTC7813’s cascaded Boost+Buck solution has continuous, nonpulsating, input and output currents, substantially reducing voltage ripple and EMI. The LTC7813 has independent feedback and compensation points for the boost and buck regulation loops, enabling a fast output transient response that can be externally optimized.

Applications

  • Automotive and Industrial Power Systems
  • High Power Battery Operated Systems

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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 (3)

Documentation & Resources

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  • 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.

    LTspice

    Models for the following parts are available in LTspice:

    LTC7813

    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

    LTC7813 (Boost) Project - DC2435A-C 4-24Vin to 24Vout, 3A, 200kHz
    LTC7813 (Buck) Project - DC2435A-C 5-56Vin to 5Vout, 8A, 200kHz

    Design tools for the following parts are available in LTpowerCAD:

    LTC7813(BOOST)
    LTC7813(BUCK)

    Product Recommendations

    LTC7813 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
    LTC7813EUH#PBF Material Declaration Reliability Data 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)
    LTC7813EUH#TRPBF Material Declaration Reliability Data 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)
    LTC7813HUH#PBF Material Declaration Reliability Data 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)
    LTC7813HUH#TRPBF Material Declaration Reliability Data 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)
    LTC7813IUH#PBF Material Declaration Reliability Data 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)
    LTC7813IUH#TRPBF Material Declaration Reliability Data 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)
    LTC7813MPUH#PBF Material Declaration Reliability Data 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)
    LTC7813MPUH#TRPBF Material Declaration Reliability Data 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)
    Wafer Fabrication Data R526 Reliability Data

    Support & Discussions

    LTC7813 Contact ADI Technical Support »
    LTC7813 Ask your question »
    LTC7813 Contact ADI Technical Support » LTC7813 Ask your question »

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    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.

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