National Semiconductor | High-performance Analog

 

 LM3420   
Lithium-Ion Battery Charge Controller 		Click link to Download

Features
  • Voltage options for charging 1, 2, 3 or 4 cells
  • Tiny SOT23-5 package
  • Precision (0.5%) end-of-charge control
  • Drive capability for external power stage
  • Low quiescent current, 85 µA (typ.)

    • Description

    The LM3420 series of controllers are monolithic integrated circuits designed for charging and end-of-charge control for Lithium-Ion rechargeable batteries. The LM3420 is available in five fixed voltage versions for one through four cell charger applications (4.2V, 8.2V/8.4V, 12.6V and 16.8V respectively).

    Included in a very small package is an (internally compensated) op amp, a bandgap reference, an NPN output transistor, and voltage setting resistors. The amplifier's inverting input is externally accessible for loop frequency compensation. The output is an open-emitter NPN transistor capable of driving up to 15 mA of output current into external circuitry.

    A trimmed precision bandgap reference utilizes temperature drift curvature correction for excellent voltage stability over the operating temperature range. Available with an initial tolerance of 0.5% for the A grade version, and 1% for the standard version, the LM3420 allows for precision end-of-charge control for Lithium-Ion rechargeable batteries.

    The LM3420 is available in a sub-miniature 5-lead SOT23-5 surface mount package thus allowing very compact designs.


    Applications

  • Lithium-Ion battery charging
  • Suitable for linear and switching regulator charger designs

    •  

    ParametersValues
    Full Charge Vmax 8.4 Volt
    Input Min Voltage Undefined Volt
    Input Max Voltage 20 Volt
    Battery Cells 2 cell
    Battery Chemistry Li-Ion
    Charge Modes CC, CV
    On/Off Pin No
    Special Features 1% tolerance, 0.5% tolerance
    Full Charge Vmin 8.4 Volt
    PowerGood / Error Flag No
    Adjustable Output Yes
    Voltage Fault Protection No
    Output Current Undefined mA
    RegType Linear/LDO Controller
    Temperature Min -40 deg C
    Temperature Max 125 deg C

    Datasheets
    TitleSizeDateOther
    Language
    LM3420 Lithium-Ion Battery Charge Controller441
    Kbytes    		4-Oct-04日本語  


    Application Notes
    TitleSizeDateOther
    Language
    AN-1967: Application Note 1967 LM3424 Buck-Boost Evaluation Board1027
    Kbytes    		22-Aug-09 
    AN-1969: Application Note 1969 LM3424 Boost Evaluation Board988
    Kbytes    		22-Aug-09 
    AN-1985: Application Note 1985 LM3429 Buck-Boost Evaluation Board705
    Kbytes    		3-Aug-09 
    AN-1986: Application Note 1986 LM3429 Boost Evaluation Board672
    Kbytes    		3-Aug-09 
    AN-1907: Application Note 1907 LM3423 Buck-Boost Configuration Evaluation Board879
    Kbytes    		8-Dec-08 
    AN-1872: Application Note 1872 LM3423 Boost Evaluation Board764
    Kbytes    		8-Dec-08 中文


    Other Technical Documents
    TitleTypeDate
    Battery ChargingApp Note 2007-03-21

    Part Number(s)
    (NSID)    		Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM3420AM5-8.4/NOPB

    LM3420AM5-8.4

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide1000
    AVNET-EMWorldwide1000
    DIGI-KEYWorldwide0
    MOUSERWorldwide987
    TAYLORAmericas1000
    		$0.93 each at 1K+ pcsreel
    of
    1000
    LM3420M5X-8.4/NOPB

    LM3420M5X-8.4

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$0.88 each at 1K+ pcsreel
    of
    3000

    Obsolete Versions
    Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
    LM3420AM5-12.6
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LM3420AM5-16.8
    		NONE
    		NATIONAL SEMICONDUCTOR
    		16 Nov 2008
    LM3420AM5X-12.6
    		NONE
    		NATIONAL SEMICONDUCTOR
    		16 Nov 2008
    LM3420AM5X-16.8
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LM3420AM5X-4.2
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LM3420AM5X-8.2
    		NONE
    		NATIONAL SEMICONDUCTOR
    		08 May 2006
    LM3420AM5X-8.4
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LM3420M5-12.6
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LM3420M5-16.8
    		NONE
    		NATIONAL SEMICONDUCTOR
    		16 Nov 2008
    LM3420M5-4.2
    		NONE
    		NATIONAL SEMICONDUCTOR
    		16 Nov 2008
    LM3420M5-8.4
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LM3420M5X-12.6
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LM3420M5X-16.8
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LM3420M5X-4.2
    		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 LM3420.

    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 LM3420 is located at RoHS Status.

    Part Number(s)
    (NSID)    		Weight
    (milligrams)    		TypePinsMSL RatingPeak ReflowRoHS
    Status    		CAD SymbolsModelsPackage
    Marking
    Format
    LM3420AM5-8.4/NOPB

    LM3420AM5-8.4
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailN/AN/A
    		D03A
    XTT
    LM3420M5X-8.4/NOPB

    LM3420M5X-8.4
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailN/AN/A
    		D03B
    XTT

    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 LM3420.

    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 LM3420 is located at RoHS Status.

    CAD Symbols and Models
    N/A
    		 Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM3420AM5-8.4LFAST10201400027850002790251354
    LM3420M5X-8.4LFAST10201400027850002790251354

    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 LM3420.

    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 LM3420 is located at RoHS Status.

    Obsolete Versions
    Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
    LM3420AM5-12.6
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LM3420AM5-16.8
    		NONE
    		NATIONAL SEMICONDUCTOR
    		16 Nov 2008
    LM3420AM5X-12.6
    		NONE
    		NATIONAL SEMICONDUCTOR
    		16 Nov 2008
    LM3420AM5X-16.8
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LM3420AM5X-4.2
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LM3420AM5X-8.2
    		NONE
    		NATIONAL SEMICONDUCTOR
    		08 May 2006
    LM3420AM5X-8.4
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LM3420M5-12.6
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LM3420M5-16.8
    		NONE
    		NATIONAL SEMICONDUCTOR
    		16 Nov 2008
    LM3420M5-4.2
    		NONE
    		NATIONAL SEMICONDUCTOR
    		16 Nov 2008
    LM3420M5-8.4
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LM3420M5X-12.6
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LM3420M5X-16.8
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LM3420M5X-4.2
    		NONE
    		NATIONAL SEMICONDUCTOR
    		16 Nov 2008

    [Information as of 9-Feb-2012]
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