National Semiconductor | High-performance Analog

 

 LM2619   
500mA Sub-Miniature Step-Down DC-DC Converter 		Click link to Download

Features
  • Sub-miniature 10-bump thin micro SMD package
  • Uses small ceramic capacitors
  • 5mV typ PWM mode output voltage ripple(COUT = 22µF)
  • Internal soft start
  • Current overload protection
  • Thermal Shutdown
  • External compensation

    • Description

    The LM2619 step down DC-DC converter is optimized for powering circuits from a single Lithium-Ion cell. It steps down an input voltage of 2.8V to 5.5V to an output of 1.5V to 3.6V at up to 500mA. Output voltage is set using resistor feedback dividers.

    The device offers three modes for mobile phones and similar portable applications. Fixed-frequency PWM mode minimizes RF interference. A SYNC input allows synchronizing the switching frequency in a range of 500kHz to 1MHz. Low current hysteretic PFM mode reduces quiescent current to 160µA (typ.). Shutdown mode turns the device off and reduces battery consumption to 0.02µA (typ.).

    Current limit and thermal shutdown features protect the device and system during fault conditions.

    The LM2619 is available in a 10 bump micro SMD package. This packaging uses National's chip-scale micro SMD technology and offers the smallest possible size. A high switching frequency (600kHz) allows use of tiny surface-mount components.

    The device features external compensation to tailor the response to a wide range of operating conditions.

    Key Specification

  • Operates from a single LiION cell (2.8V to 5.5V)
  • Output voltage (1.5V to 3.6V)
  • ±1% DC feedback voltage precision
  • 500mA maximum load capability
  • 600µA typ PWM mode quiescent current
  • 0.02µA typ shutdown current
  • 600kHz PWM switching frequency
  • SYNC input for PWM mode frequency synchronization from 500kHz to 1MHz
  • High efficiency (96% typ at 3.9VIN, 3.6VOUT and 200mA) in PWM mode from internal synchronous rectification
  • 100% Maximum Duty Cycle for Lowest Dropout


    • Applications

  • Mobile Phones
  • Hand-Held Radios
  • RF PC Cards
  • Wireless LAN Cards

    • Also Recommended
    LM2653▲1.5A Synchronous Buck Converter



    Typical Application
    click for larger image


    		Connection Diagram
    click for larger image



    Typical Performance
    click for larger image


    Parameters / ValuesLM2619 LM2653
    Output Current500 mA 1500 mA
    Input Min Voltage2.8 Volt 4 Volt
    Input Max Voltage5.5 Volt 14 Volt
    Output Min1.5 Volt 1.5 Volt
    Output Max3.6 Volt 5 Volt
    Frequency Min500 kHz 300 kHz
    Frequency Max1000 kHz 300 kHz
    Efficiency (peak)96 % 97 %
    Integrated InductorNo No
    PowerGood / Error FlagNo Yes
    SoftStartYes Yes
    Sync PinYes No
    InvertingNo No
    FlybackNo No
    RegTypeSwitching Regulator Switching Regulator
    Temperature Min-25 deg C -40 deg C
    Temperature Max85 deg C 125 deg C
    Adjustable OutputYes Yes
    Adj Switch FrequencyYes No
    PWM ModeCurrent Mode Control Current Mode Control
    TopologySynchronous Buck Synchronous Buck
    Special FeaturesPin-selectable PWM/PFM modes, Max Iq in shutdown is 3uA, 2% output accuracy Max. Iq at shutdown is 20uA over full temp range, 7uA typical
    Step-DownYes Yes
    Multiple Output CapabilityNo No
    Output PowerUndefined Watt Undefined Watt
    Output VoltageUndefined Volt Undefined Volt
    Output Range1.5V to 3.6V 1.5V to 5.0V
    Switching Frequency600 kHz 300 kHz
    Feedback VoltageUndefined Volt Undefined Volt
    On/Off PinYes Yes
    Regulator FamilyUndefined Undefined
    AEC Q-100 Automotive GradeUndefined Undefined
    Synchronous RectificationYes Yes

    Datasheets
    TitleSizeDateOther
    Language
    LM2619 500mA Sub-Miniature Step-Down DC-DC Converter859
    Kbytes    		3-Oct-03   

    Part Number(s)
    (NSID)    		Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM2619ATL/NOPB


    RoHS Status

    MICRO SMD    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    DIGI-KEYWorldwide1350
    MOUSERWorldwide500
    		$0.70 each at 1K+ pcsreel
    of
    250
    LM2619ATLX/NOPB


    RoHS Status

    MICRO SMD    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    TECHMOSAAsia Pacific60000
    		$0.70 each at 1K+ pcsreel
    of
    3000

    Obsolete Versions
    Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
    LM2619MTC
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LM2619MTCX
    		NONE
    		NATIONAL SEMICONDUCTOR
    		16 Nov 2008

    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 LM2619.

    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 LM2619 is located at RoHS Status.

    Part Number(s)
    (NSID)    		Weight
    (milligrams)    		TypePinsMSL RatingPeak ReflowRoHS
    Status    		CAD SymbolsModelsPackage
    Marking
    Format
    LM2619ATL/NOPB

    		5.594
    		MICRO SMD101260DetailDownloadN/A
    		XYTT
    I S76A
    LM2619ATLX/NOPB

    		5.594
    		MICRO SMD101260DetailDownloadN/A
    		XYTT
    I S76A

    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 LM2619.

    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 LM2619 is located at RoHS Status.

    Design Tools
    TitleSizeDate
    LM2619MTC 500mA Step-Down DC-DC Converter  

    CAD Symbols and Models
    Download LM2619 CAD Symbols
    		 Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM2619ATLABCD15004268000639400011814314958
    LM2619ATLXABCD15004268000639400011814314958

    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 LM2619.

    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 LM2619 is located at RoHS Status.

    Obsolete Versions
    Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
    LM2619MTC
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LM2619MTCX
    		NONE
    		NATIONAL SEMICONDUCTOR
    		16 Nov 2008

    [Information as of 8-Feb-2012]
    Copyright © 2011 National Semiconductor Corporation