National Semiconductor | High-performance Analog

 

 LM3677   
3MHz, 600mA Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits from the PowerWise® Family		 Click link to Download

Features

  • 16 µA typical quiescent current
  • 600 mA maximum load capability
  • 3 MHz PWM fixed switching frequency (typ.)
  • Automatic PFM/PWM mode switching
  • Available in 5-bump micro SMD package and 6-pin LLP package
  • Internal synchronous rectification for high efficiency
  • Internal soft start
  • 0.01 µA typical shutdown current
  • Operates from a single Li-Ion cell battery
  • Only three tiny surface-mount external components required (solution size less than 20 mm 2)
  • Current overload and thermal shutdown protection

    • Description

    The LM3677 step-down DC-DC converter is optimized for powering ultra-low voltage circuits from a single Li-Ion cell battery and input voltage rails from 2.7V to 5.5V. It provides up to 600 mA load current over the entire input voltage range. The LM3677 is configured to different fixed voltage output options as well as an adjustable output voltage version range from 1.2V to 3.3V.

    The device offers superior features and performance for mobile phones and similar portable applications with complex power management systems. Automatic intelligent switching between PWM low-noise and PFM low-current mode offers improved system control. During PWM mode operation, the device operates at a fixed frequency of 3 MHz (typ). PWM mode drives loads from ~ 80 mA to 600 mA max. Hysteretic PFM mode extends the battery life by reducing the quiescent current to 16 µA (typ.) during light load and standby operation. Internal synchronous rectification provides high efficiency. In shutdown mode (Enable pin pulled down), the device turns off and reduces battery consumption to 0.01 µA (typ.).

    The LM3677 is available in a lead-free (NOPB) 5-bump micro SMD package and 6-pin LLP package. A switching frequency of 3 MHz (typ.) allows use of tiny surface-mount components. Only three external surface-mount components, an inductor and two ceramic capacitors, are required.


    Applications

  • Mobile Phones
  • PDAs
  • MP3 Players
  • W-LAN
  • Portable Instruments
  • Digital Still Cameras
  • Portable Hard Disk Drives




    • Typical Application
    *click for larger image


    		Block Diagram
    *click for larger image



    Typical Performance
    click for larger image


     

    ParametersValues
    Output Current 600 mA
    Input Min Voltage 2.7 Volt
    Input Max Voltage 5.5 Volt
    Output Min 1.2 Volt
    Output Max 3.3 Volt
    Frequency Min 3000 kHz
    Frequency Max 3000 kHz
    Efficiency (peak) 93 %
    Integrated Inductor No
    PowerGood / Error Flag No
    SoftStart Yes
    Sync Pin No
    Inverting No
    Flyback No
    RegType Switching Regulator
    Temperature Min -30 deg C
    Temperature Max 85 deg C
    Adjustable Output Yes
    Adj Switch Frequency No
    PWM Mode Auto
    Topology Synchronous Buck
    Step-Down Yes
    Multiple Output Capability No
    Output Range 1.2V to 3.3V
    Switching Frequency 3000 kHz
    Feedback Voltage Undefined Volt
    On/Off Pin Yes
    Regulator Family Undefined
    AEC Q-100 Automotive Grade Undefined
    PowerWise Yes
    Synchronous Rectification Yes

    Datasheets
    TitleSizeDateOther
    Language
    LM3677 3MHz, 600mA Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits8161
    Kbytes    		28-Oct-08日本語  


    Application Notes
    TitleSizeDateOther
    Language
    AN-1595: Application Note 1595 LM3677 Evaluation Board2801
    Kbytes    		14-Oct-08 


    Other Technical Documents
    TitleTypeDate
    Determine Buck Converter Efficiency in PFM ModeExternal Article 2007-09-01

    Part Number(s)
    (NSID)    		Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM3677LE-1.2/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$0.75 each at 1K+ pcsreel
    of
    1000
    LM3677LE-1.5/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$0.75 each at 1K+ pcsreel
    of
    1000
    LM3677LE-1.8/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$0.75 each at 1K+ pcsreel
    of
    1000
    LM3677LE-1.82/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$0.75 each at 1K+ pcsreel
    of
    1000
    LM3677LEE-1.2/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    DIGI-KEYWorldwide645
    MOUSERWorldwide365
    		$0.75 each at 1K+ pcsreel
    of
    250
    LM3677LEE-1.5/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    DIGI-KEYWorldwide495
    MOUSERWorldwide500
    		$0.75 each at 1K+ pcsreel
    of
    250
    LM3677LEE-1.8/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    DIGI-KEYWorldwide379
    MOUSERWorldwide460
    		$0.75 each at 1K+ pcsreel
    of
    250
    LM3677LEE-1.82/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide490
    MOUSERWorldwide500
    		$0.75 each at 1K+ pcsreel
    of
    250
    LM3677LEX-1.2/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$0.75 each at 1K+ pcsreel
    of
    4500
    LM3677LEX-1.5/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$0.75 each at 1K+ pcsreel
    of
    4500
    LM3677LEX-1.8/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$0.75 each at 1K+ pcsreel
    of
    4500
    LM3677LEX-1.82/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$0.75 each at 1K+ pcsreel
    of
    4500
    LM3677TL-1.2/NOPB


    RoHS Status

    MICRO SMD    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    AVNET-EMWorldwide500
    DIGI-KEYWorldwide900
    MOUSERWorldwide500
    		$0.75 each at 1K+ pcsreel
    of
    250
    LM3677TL-1.3/NOPB


    RoHS Status

    MICRO SMD    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    DIGI-KEYWorldwide250
    MOUSERWorldwide500
    RS COMPONENTSWorldwide121
    		$0.75 each at 1K+ pcsreel
    of
    250
    LM3677TL-1.5/NOPB


    RoHS Status

    MICRO SMD    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide500
    MOUSERWorldwide500
    RS COMPONENTSWorldwide245
    		$0.75 each at 1K+ pcsreel
    of
    250
    LM3677TL-1.8/NOPB


    RoHS Status

    MICRO SMD    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    DIGI-KEYWorldwide746
    MOUSERWorldwide500
    RS COMPONENTSWorldwide121
    		$0.75 each at 1K+ pcsreel
    of
    250
    LM3677TL-1.875/NOPB


    RoHS Status

    MICRO SMD    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide500
    MOUSERWorldwide500
    		$0.75 each at 1K+ pcsreel
    of
    250
    LM3677TL-2.5/NOPB


    RoHS Status

    MICRO SMD    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    DIGI-KEYWorldwide500
    MOUSERWorldwide250
    RS COMPONENTSWorldwide120
    		$0.75 each at 1K+ pcsreel
    of
    250
    LM3677TL-ADJ/NOPB


    RoHS Status

    MICRO SMD    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    AVNET-EMWorldwide800
    DIGI-KEYWorldwide490
    MOUSERWorldwide500
    		$0.75 each at 1K+ pcsreel
    of
    250
    LM3677TLX-1.2/NOPB


    RoHS Status

    MICRO SMD    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$0.75 each at 1K+ pcsreel
    of
    3000
    LM3677TLX-1.3/NOPB


    RoHS Status

    MICRO SMD    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$0.75 each at 1K+ pcsreel
    of
    3000
    LM3677TLX-1.5/NOPB


    RoHS Status

    MICRO SMD    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$0.75 each at 1K+ pcsreel
    of
    3000
    LM3677TLX-1.8/NOPB


    RoHS Status

    MICRO SMD    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$0.75 each at 1K+ pcsreel
    of
    3000
    LM3677TLX-1.875/NOPB


    RoHS Status

    MICRO SMD    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$0.75 each at 1K+ pcsreel
    of
    3000
    LM3677TLX-2.5/NOPB


    RoHS Status

    MICRO SMD    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$0.75 each at 1K+ pcsreel
    of
    3000
    LM3677TLX-ADJ/NOPB


    RoHS Status

    MICRO SMD    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$0.75 each at 1K+ pcsreel
    of
    3000

    All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

    Moisture Sensitivity Level Data for LM3677.

    A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

    National's certificate of product compliance for LM3677 is located at RoHS Status.

    Part Number(s)
    (NSID)    		DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM3677LE-1.8EV
    		LM3677LE-1.8 Evaluation BoardFull production


     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$97.00 each1

    Description:

    The LM3677 step-down DC-DC converter is optimized for powering ultra-low voltage circuits from a single Li-Ion cell battery and input voltage rails from 2.7V to 5.5V. It provides up to 600mA load current over the entire input voltage range. The LM3677 is configured to different fixed voltage output options as well as an adjustable output voltage version range from 1.2 to 3.3V.

    The LM3677 evaluation board is a working demonstration of a step down DC-DC converter. The application note contains information about the evaluation board. For further information on buck converter topology, device electrical characteristics, and component selection, please refer to the datasheet.

    Features:

    • 16 µ A typical quiescent current
    • 600mA maximum load capability
    • 3 MHz PWM foxed switching frequency (typ.)
    • Automatic PFM/PWM mode switching
    • Available in 5-bump micro SMD package and 6-pin LLP package
    • Internal synchronous rectification for high efficiency
    • Internal soft start
    • 0.01 µ A typical shutdown current
    • Operates from a single Li-Ion cell battery
    • Only three tiny surface-mount external components required (solution size less than 20mm2)
    • Current overload and thermal shutdown protection

    Applications:

    • Mobile Phones
    • PDAs
    • MP3 Players
    • W-LAN
    • Portable Instruments
    • Digital Still Cameras
    • Portable Hard disk drives

    Part Number(s)
    (NSID)    		DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM3677TL-1.8EV
    		3MHz, 600mA Miniature Step-Down DC-DC Converter for Ultra Low Voltage CircuitsFull production


     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$97.00 each1

    Description:

    The LM3677 step-down DC-DC converter is optimized for powering ultra-low voltage circuits from a single Li-Ion cell battery and input voltage rails from 2.7V to 5.5V. It provides up to 600mA load current, over the entire input voltage range. The LM3677 is configured to four output voltages of 1.3V, 1.5V, 1.8V and 2.5V.

    The device offers superior features and performance for mobile phones and similar portable applications with complex power management systems. Automatic intelligent switching between PWM low-noise and PFM low-current mode offers improved system control. During PWM mode operation, the device operates at a fixed frequency of 3 MHz (typ). PWM mode drives loads from approximately 80mA to 600mA max. Hysteretic PFM mode extends the battery life by reducing the quiescent current to 16 µA (typ) during light load and standby operation. Internal synchronous rectification provides high efficiency. In shutdown mode (Enable pin pulled down), the device turns off and reduces battery consumption to 0.01 µA (typ).

    The LM3677 evaluation board is a working demonstration of a step down DC-DC converter. The application note contains information about the evaluation board. For further information on buck converter topology, device electrical characteristics, and component seledtion please refer to the data. sheet.

    Features:

    • 16 µA typical quiescent current
    • 600 mA maximum load capability
    • 3MHz PWM fixed switching frequency (typ)
    • Automatic PFM/PWM mode switching
    • Available in 5-bump micro SMD package
    • Internal synchronous rectification for high efficiency
    • Internal soft start
    • 0.01 µA typical shutdown current
    • Operates from a single Li-Ion cell battery
    • Only three tiny surface-mount external components required (solution size less than 20 mm2)
    • Current overload and Thermal shutdown protection

    Applications:

    • Mobile Phones
    • PDAs
    • MP3 players
    • W-LAN
    • Portable Instruments
    • Digital still cameras
    • Portable Hard disk drives



    National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C1) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/en/packaging/greennopb.html. Lead free products are RoHS compliant.

    Lead Free product status is available through the search tool located here

    Part Number(s)
    (NSID)    		Weight
    (milligrams)    		TypePinsMSL RatingPeak ReflowRoHS
    Status    		CAD SymbolsModelsPackage
    Marking
    Format
    LM3677LE-1.2/NOPB

    		5.388
    		LLP61260DetailDownloadN/A
    		XVK
    LM3677LE-1.5/NOPB

    		5.388
    		LLP61260DetailDownloadN/A
    		XVL
    LM3677LE-1.8/NOPB

    		5.388
    		LLP61260DetailDownloadN/A
    		XVN
    LM3677LE-1.82/NOPB

    		5.388
    		LLP61260DetailDownloadN/A
    		XV5
    LM3677LEE-1.2/NOPB

    		5.388
    		LLP61260DetailDownloadN/A
    		XVK
    LM3677LEE-1.5/NOPB

    		5.388
    		LLP61260DetailDownloadN/A
    		XVL
    LM3677LEE-1.8/NOPB

    		5.388
    		LLP61260DetailDownloadN/A
    		XVN
    LM3677LEE-1.82/NOPB

    		5.388
    		LLP61260DetailDownloadN/A
    		XV5
    LM3677LEX-1.2/NOPB

    		5.388
    		LLP61260DetailDownloadN/A
    		XVK
    LM3677LEX-1.5/NOPB

    		5.388
    		LLP61260DetailDownloadN/A
    		XVL
    LM3677LEX-1.8/NOPB

    		5.388
    		LLP61260DetailDownloadN/A
    		XVN
    LM3677LEX-1.82/NOPB

    		5.388
    		LLP61260DetailDownloadN/A
    		XV5
    LM3677TL-1.2/NOPB

    		1.854
    		MICRO SMD51260DetailDownloadN/A
    		XV
    I 3
    LM3677TL-1.3/NOPB

    		1.854
    		MICRO SMD51260DetailDownloadN/A
    		XV
    I V
    LM3677TL-1.5/NOPB

    		1.854
    		MICRO SMD51260DetailDownloadN/A
    		XV
    I X
    LM3677TL-1.8/NOPB

    		1.854
    		MICRO SMD51260DetailDownloadN/A
    		XV
    I Y
    LM3677TL-1.875/NOPB

    		1.854
    		MICRO SMD51260DetailDownloadN/A
    		XV
    I 9
    LM3677TL-2.5/NOPB

    		1.854
    		MICRO SMD51260DetailDownloadN/A
    		XV
    I Z
    LM3677TL-ADJ/NOPB

    		1.854
    		MICRO SMD51260DetailDownloadN/A
    		XV
    I 4
    LM3677TLX-1.2/NOPB

    		1.854
    		MICRO SMD51260DetailDownloadN/A
    		XV
    I 3
    LM3677TLX-1.3/NOPB

    		1.854
    		MICRO SMD51260DetailDownloadN/A
    		XV
    I V
    LM3677TLX-1.5/NOPB

    		1.854
    		MICRO SMD51260DetailDownloadN/A
    		XV
    I X
    LM3677TLX-1.8/NOPB

    		1.854
    		MICRO SMD51260DetailDownloadN/A
    		XV
    I Y
    LM3677TLX-1.875/NOPB

    		1.854
    		MICRO SMD51260DetailDownloadN/A
    		XV
    I 9
    LM3677TLX-2.5/NOPB

    		1.854
    		MICRO SMD51260DetailDownloadN/A
    		XV
    I Z
    LM3677TLX-ADJ/NOPB

    		1.854
    		MICRO SMD51260DetailDownloadN/A
    		XV
    I 4

    All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

    Moisture Sensitivity Level Data for LM3677.

    A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

    National's certificate of product compliance for LM3677 is located at RoHS Status.

    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM3677LE-1.2CMOS70213010015840003449464325
    LM3677LE-1.5CMOS70213010015840003449464325
    LM3677LE-1.8CMOS70213010015840003449464325
    LM3677LE-1.82CMOS70213010015840003449464325
    LM3677LEE-1.2CMOS70213010015840003449464325
    LM3677LEE-1.5CMOS70213010015840003449464325
    LM3677LEE-1.8CMOS70213010015840003449464325
    LM3677LEE-1.82CMOS70213010015840003449464325
    LM3677LEX-1.2CMOS70213010015840003449464325
    LM3677LEX-1.5CMOS70213010015840003449464325
    LM3677LEX-1.8CMOS70213010015840003449464325
    LM3677LEX-1.82CMOS70213010015840003449464325
    LM3677TL-1.2CMOS70213010015840003449464325
    LM3677TL-1.3CMOS70213010015840003449464325
    LM3677TL-1.5CMOS70213010015840003449464325
    LM3677TL-1.8CMOS70213010015840003449464325
    LM3677TL-1.875CMOS70213010015840003449464325
    LM3677TL-2.5CMOS70213010015840003449464325
    LM3677TL-ADJCMOS70213010015840003449464325
    LM3677TLX-1.2CMOS70213010015840003449464325
    LM3677TLX-1.3CMOS70213010015840003449464325
    LM3677TLX-1.5CMOS70213010015840003449464325
    LM3677TLX-1.8CMOS70213010015840003449464325
    LM3677TLX-1.875CMOS70213010015840003449464325
    LM3677TLX-2.5CMOS70213010015840003449464325
    LM3677TLX-ADJCMOS70213010015840003449464325

    Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

    For more information on Reliability Metrics, please click here.


    All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

    Moisture Sensitivity Level Data for LM3677.

    A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

    National's certificate of product compliance for LM3677 is located at RoHS Status.

    [Information as of 9-Feb-2012]
    Copyright © 2011 National Semiconductor Corporation