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  2. Power Management
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  4. Step-Down (Buck) Regulators
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  6. LTC3626

Data Sheet
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Overview

Features and Benefits

  • 3.6V to 20V Input Voltage Range
  • Wide Output Voltage Range of 0.6V to 97% VIN Optimized for 0.6V to 6V
  • Low RDS(ON) Integrated Switches Provide Up to 95% Efficiency
  • Up to 2.5A of Output Current
  • Average Input and Output Current Monitoring
  • Programmable Average Input/Output Current Limit
  • Die Temperature Monitor and Programmable Limit
  • Adjustable Switching Frequency: 500kHz to 3MHz
  • External Frequency Synchronization
  • Current Mode Operation for Excellent Line and Load Transient Response
  • 0.6V Reference with 1% Accuracy Over Temperature
  • User Selectable Burst Mode® or Forced Continuous Operation
  • Short-Circuit Protected
  • Output Voltage Tracking Capability
  • Power Good Status Output
  • Available in Small, Thermally Enhanced, 20-Lead (3mm × 4mm) QFN Package

Product Details

The LTC3626 is a high efficiency, monolithic synchronous buck regulator using a phase-lockable controlled on-time, current mode architecture capable of supplying up to 2.5A of output current. The operating supply voltage range is 3.6V to 20V, making it suitable for a wide range of power supply applications.

The operating frequency is programmable from 500kHz to 3MHz with an external resistor allowing the use of small surface mount inductors. For applications sensitive to switching noise, the LTC3626 can be externally synchronized over the same frequency range. An internal phase-locked loop aligns the on-time of the top power MOSFET to the internal or external clock. This unique controlled on-time architecture is ideal for high step-down ratio applications that demand high switching frequencies and fast transient response. An internal phase lock loop servos the on-time of the internal one-shot timer to match the frequency of the internal clock or an applied external clock.

The LTC3626 offers two operational modes: Burst Mode and forced continuous mode to allow the user to optimize output voltage ripple, noise and light load efficiency for a given application.

Applications

  • Distributed Power Systems
  • Battery-Powered Instruments
  • Point-of-Load Power Supply

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 (6)
  • Data Sheets (1)
  • Reliability Data (1)
  • User Guides (1)
  • Solutions Bulletins & Brochures (1)
  • Design Notes (1)
  • Technical Articles (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

    LTC3626 Demo Circuit - 2.5V, 1MHz Step-Down with Average Input Current Limit & Monitor (3.6-20V to 2.5V @ 2.5A)

    Models for the following parts are available in LTspice:

    LTC3626

    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

    LTC3626 Project - 20V, 2.5A Buck Regulator with Current and Temperature Monitoring (4-20V to 1.8V @ 2.5A)

    Design tools for the following parts are available in LTpowerCAD:

    LTC3626

    Product Recommendations

    LTC3626 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
    LTC3626EUDC#PBF Material Declaration Reliability Data 20-Lead QFN (3mm x 4mm x 0.75mm w/ EP)
    LTC3626EUDC#TRPBF Material Declaration Reliability Data 20-Lead QFN (3mm x 4mm x 0.75mm w/ EP)
    LTC3626IUDC#PBF Material Declaration Reliability Data 20-Lead QFN (3mm x 4mm x 0.75mm w/ EP)
    LTC3626IUDC#TRPBF Material Declaration Reliability Data 20-Lead QFN (3mm x 4mm x 0.75mm w/ EP)
    Wafer Fabrication Data R539 Reliability Data

    Support & Discussions

    LTC3626 Contact ADI Technical Support »
    LTC3626 Ask your question »
    LTC3626 Contact ADI Technical Support » LTC3626 Ask your question »

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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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