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  6. LTC1773

Data Sheet
PDF
JP
User Guide
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Overview

Features and Benefits

  • High Efficiency: Up to 95%
  • Constant Frequency 550kHz Operation
  • VIN from 2.65V to 8.5V
  • VOUT from 0.8V to VIN
  • OPTI-LOOP® Compensation Minimizes COUT
  • Synchronizable up to 750kHz
  • Selectable Burst Mode Operation
  • Low Quiescent Current: 80µA
  • Low Dropout Operation: 100% Duty Cycle
  • Secondary Winding Regulation
  • Soft-Start
  • Current Mode Operation for Excellent Line and Load Transient Response
  • Low Quiescent Current: 80µA
  • Low Shutdown IQ = 10µA
  • ±1.5% Reference Accuracy
  • Precision 2.5V Undervoltage Lockout
  • Available in 10-Lead MSOP

Product Details

The LTC1773 is a current mode synchronous buck regulator controller that drives external complementary power MOSFETs using a fixed frequency architecture. The operating supply range is from 2.65V to 8.5V, making it suitable for 1- or 2-cell lithium-ion battery powered applications. Burst Mode® operation provides high efficiency at low load currents. 100% duty cycle provides low dropout operation which extends operating time in battery-operated systems.

The operating frequency is internally set at 550kHz, allowing the use of small surface mount inductors. For switching-noise sensitive applications, it can be synchronized up to 750kHz. Peak current limit is user programmable with an external high side sense resistor. A SYNC/FCB control pin guarantees regulation of secondary windings regardless of load on the main output by forcing continuous operation. Burst Mode operation is inhibited during synchronization or when the SYNC/FCB pin is pulled low to reduce noise and RF interference. Soft-start is provided by an external capacitor.

Synchronous rectification increases efficiency and eliminates the need for a Schottky diode, saving components and board space. The LTC1773 comes in a 10-lead MSOP package.

Applications

  • Cellular Telephones
  • RF PA Supply
  • Portable Instruments
  • Wireless MODEMS
  • Distributed Power Systems
  • Notebook and Palm Top Computers, PDAs
  • Single and Dual Cell Lithium-Ion Powered Devices

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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

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  • Data Sheet (1)
  • Reliability Data (1)
  • User Guide (2)
  • Design Note (1)
  • Technical Article (1)
    • Document Type

    Tools & Simulations

    LTspice

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    LTC1773

    Product Recommendations

    LTC1773 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
    LTC1773EMS#PBF Material Declaration Reliability Data 10-Lead MSOP
    LTC1773EMS#TRPBF Material Declaration Reliability Data 10-Lead MSOP
    Wafer Fabrication Data R384 Reliability Data

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    Select Model for PCN Information
    • LTC1773EMS#PBF Production
    • LTC1773EMS#TRPBF Production

    Support & Discussions

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