National Semiconductor | High-performance Analog

 

 LM3503   
Dual-Display Constant Current LED Driver with Analog Brightness Control from the PowerWise® Family		 Click link to Download

Features
  • Drives up to 4, 6, 8 or 10 White LEDs for Dual Display Backlighting
  • >80% Peak Efficiency
  • Output Voltage Protection Options: 16V, 25V, 35V & 44V
  • Input Under-Voltage Protection
  • Internal Soft Start Eliminates Inrush Current
  • 1 MHz Constant Switching Frequency
  • Analog Brightness Control
  • Wide Input Voltage Range: 2.5V to 5.5V
  • Low Profile Packages: <1 mm Height
  • 10 Bump MicroSMD
  • 16 Pin LLP

    • Description

    The LM3503 is a white LED driver for lighting applications. For dual display backlighting applications, the LM3503 provides a complete solution. The LM3503 contains two internal white LED current bypass FET (Field Effect Transistor) switches. The white LED current can be adjusted with a DC voltage from a digital to analog converter or RC filtered PWM (pulse-width-modulated) signal at the Cntrl pin.

    With no external compensation, cycle-by-cycle current limit, output over-voltage protection, input under-voltage protection, and dynamic white LED current control capability, the LM3503 offers superior performance over other step-up white LED drivers.


    Applications

  • Dual Display Backlighting in Portable devices
  • Cellular Phones and PDAs




    • Typical Application
    click for larger image


    		Block Diagram
    click for larger image



    Typical Performance
    click for larger image


     

    ParametersValues
    Regulated LEDs 10
    Total LED Current 20 mA
    Boost Type Inductive
    Switching Frequency 1000 kHz
    Input Min Voltage 2.7 Volt
    Input Max Voltage 5.5 Volt
    OutputMax Voltage 44 Volt
    Boost Voltage Regulated
    LED Configuration Series
    Switching Type Fixed Freq
    PWM BrightCtrl Yes
    Analog-V BrightCtrl Yes
    Temperature Min -40 deg C
    Temperature Max 85 deg C
    RegType WhiteLED Driver
    PowerWise Yes

    Datasheets
    TitleSizeDateOther
    Language
    LM3503 Dual-Display Constant Current LED Driver with Analog Brightness Control1066
    Kbytes    		30-Aug-06   


    Application Notes
    TitleSizeDateOther
    Language
    AN-1407: Application Note 1407 LM3502/03 Evaluation Board519
    Kbytes    		18-Jul-06 中文

    Part Number(s)
    (NSID)    		Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM3503ITL-16/NOPB


    RoHS Status

    MICRO SMD    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    FARNELLEurope and Asia194
    MOUSERWorldwide250
    NEWARKAmericas194
    		$1.10 each at 1K+ pcsreel
    of
    250
    LM3503ITL-25/NOPB


    RoHS Status

    MICRO SMD    		Full production
    Lead Time: 12 weeks

    Samples
    DistributorRegionQty
    DIGI-KEYWorldwide0
    FARNELLEurope and Asia250
    MOUSERWorldwide250
    NEWARKAmericas250
    		$1.10 each at 1K+ pcsreel
    of
    250
    LM3503ITL-35/NOPB


    RoHS Status

    MICRO SMD    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide18
    FARNELLEurope and Asia230
    MOUSERWorldwide250
    NEWARKAmericas230
    RS COMPONENTSWorldwide5
    		$1.10 each at 1K+ pcsreel
    of
    250
    LM3503ITL-44/NOPB


    RoHS Status

    MICRO SMD    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    DIGI-KEYWorldwide0
    FARNELLEurope and Asia238
    MOUSERWorldwide250
    NEWARKAmericas238
    RS COMPONENTSWorldwide995
    		$1.10 each at 1K+ pcsreel
    of
    250
    LM3503ITLX-16/NOPB


    RoHS Status

    MICRO SMD    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$1.10 each at 1K+ pcsreel
    of
    3000
    LM3503ITLX-25/NOPB


    RoHS Status

    MICRO SMD    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$1.10 each at 1K+ pcsreel
    of
    3000
    LM3503ITLX-35/NOPB


    RoHS Status

    MICRO SMD    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$1.10 each at 1K+ pcsreel
    of
    3000
    LM3503ITLX-44/NOPB


    RoHS Status

    MICRO SMD    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$1.10 each at 1K+ pcsreel
    of
    3000
    LM3503SQ-16/NOPB

    LM3503SQ-16

    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    DIGI-KEYWorldwide0
    MOUSERWorldwide1000
    		$1.10 each at 1K+ pcsreel
    of
    1000
    LM3503SQ-25/NOPB

    LM3503SQ-25

    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    DIGI-KEYWorldwide0
    MOUSERWorldwide1000
    		$1.10 each at 1K+ pcsreel
    of
    1000
    LM3503SQ-35/NOPB

    LM3503SQ-35

    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    DIGI-KEYWorldwide0
    MOUSERWorldwide930
    		$1.10 each at 1K+ pcsreel
    of
    1000
    LM3503SQ-44/NOPB

    LM3503SQ-44

    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$1.10 each at 1K+ pcsreel
    of
    1000
    LM3503SQX-16/NOPB

    LM3503SQX-16

    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$1.10 each at 1K+ pcsreel
    of
    4500
    LM3503SQX-25/NOPB

    LM3503SQX-25

    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$1.10 each at 1K+ pcsreel
    of
    4500
    LM3503SQX-35/NOPB

    LM3503SQX-35

    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$1.10 each at 1K+ pcsreel
    of
    4500
    LM3503SQX-44/NOPB

    LM3503SQX-44

    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

     

    Contact your distributor
    		$1.10 each at 1K+ pcsreel
    of
    4500

    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 LM3503.

    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 LM3503 is located at RoHS Status.

    Part Number(s)
    (NSID)    		DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM3503ITL-25EV
    		Dual-Display Constant Current LED Driver with Analog Brightness ControlFull production


     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$95.00 each1

    Description:

    The LM3503 is a white LED driver for lighting applications. For dual display backlighting applications, the LM3503 provides a complete solution. The LM3503 contains two internal white LED current bypass FET (Field Effect Transistor) switches. The white LED current can be adjusted with a DC voltage from a digital to analog converter or RC filtered PWM (pulse-width-modulated) signal at the Cntrl pin.

    With no external compensation, cycle-by-cycle current limit, output over-voltage protection, input under voltage protection, and dynamic white LED current control capability, the LM3503 offers superior performance over other step-up white LED drivers.

    The LM3502/03 evaluation board is a working demonstration of a step up DC-DC converter. The LM3502/03 can drive up to 10 white LEDs. For evaluation purposes, the evaluation board is assembled in a micro SMD package for the 25V version (LM3503ITL) and the 44V version (LM3502ITL). The LM3502/03 are also available in a 16-LLP package (see ordering information). For further information on boost converter topology, device electrical characteristics, and component selection, please refer to the the LM3502 and LM3503 datasheets.

    Features:

    • Drives up to 4, 6, 8, or 10 White LEDs for Dual Display Backlighting
    • >80% Peak Efficiency
    • Output Voltage Protection Options: 16V, 25V, 35V, and 44V
    • Input Under-Voltage Protection
    • Internal Soft Start Eliminates Inrush Current
    • 1 MHz Constant-Switching Frequency
    • Analog Brightness Control
    • Wide Input Voltage: 2.5V to 5.5V
    • Low Profile Packages: <1 mm Height
          ---10 Bump MicroSMD
          ---16 Pin LLP

    Applications:

    • Dual-Display Backlighting in Portable devices
    • Cellular Phones and PDAs



    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
    LM3503ITL-16/NOPB

    		4.215
    		MICRO SMD101260DetailDownloadN/A
    		XYTT
    I SBHB
    LM3503ITL-25/NOPB

    		4.215
    		MICRO SMD101260DetailDownloadN/A
    		XYTT
    I SBJB
    LM3503ITL-35/NOPB

    		4.215
    		MICRO SMD101260DetailDownloadN/A
    		XYTT
    I SBKB
    LM3503ITL-44/NOPB

    		4.215
    		MICRO SMD101260DetailDownloadN/A
    		XYTT
    I SDNB
    LM3503ITLX-16/NOPB

    		4.215
    		MICRO SMD101260DetailDownloadN/A
    		XYTT
    I SBHB
    LM3503ITLX-25/NOPB

    		4.215
    		MICRO SMD101260DetailDownloadN/A
    		XYTT
    I SBJB
    LM3503ITLX-35/NOPB

    		4.215
    		MICRO SMD101260DetailDownloadN/A
    		XYTT
    I SBKB
    LM3503ITLX-44/NOPB

    		4.215
    		MICRO SMD101260DetailDownloadN/A
    		XYTT
    I SDNB
    LM3503SQ-16/NOPB

    LM3503SQ-16
    		39.462
    39.599
    		LLP161
    1    		260
    260    		DetailDownloadN/A
    		NS
    UZXYTT
    L00045B
    LM3503SQ-25/NOPB

    LM3503SQ-25
    		39.461
    39.599
    		LLP161
    1    		260
    260    		DetailDownloadN/A
    		NS
    UZXYTT
    L00046B
    LM3503SQ-35/NOPB

    LM3503SQ-35
    		39.462
    39.599
    		LLP161
    1    		260
    260    		DetailDownloadN/A
    		NS
    UZXYTT
    L00047B
    LM3503SQ-44/NOPB

    LM3503SQ-44
    		39.462
    39.599
    		LLP161
    1    		260
    260    		DetailDownloadN/A
    		NS
    UZXYTT
    L00053B
    LM3503SQX-16/NOPB

    LM3503SQX-16
    		39.461
    39.599
    		LLP161
    1    		260
    260    		DetailDownloadN/A
    		NS
    UZXYTT
    L00045B
    LM3503SQX-25/NOPB

    LM3503SQX-25
    		39.461
    39.599
    		LLP161
    1    		260
    260    		DetailDownloadN/A
    		NS
    UZXYTT
    L00046B
    LM3503SQX-35/NOPB

    LM3503SQX-35
    		39.461
    39.599
    		LLP161
    1    		260
    260    		DetailDownloadN/A
    		NS
    UZXYTT
    L00047B
    LM3503SQX-44/NOPB

    LM3503SQX-44
    		39.461
    39.599
    		LLP161
    1    		260
    260    		DetailDownloadN/A
    		NS
    UZXYTT
    L00053B

    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 LM3503.

    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 LM3503 is located at RoHS Status.

    CAD Symbols and Models
    Download LM3503 CAD Symbols
    		 Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM3503ITL-16ABCD15004268000639400011814314958
    LM3503ITL-25ABCD15004268000639400011814314958
    LM3503ITL-35ABCD15004268000639400011814314958
    LM3503ITL-44ABCD15004268000639400011814314958
    LM3503ITLX-16ABCD15004268000639400011814314958
    LM3503ITLX-25ABCD15004268000639400011814314958
    LM3503ITLX-35ABCD15004268000639400011814314958
    LM3503ITLX-44ABCD15004268000639400011814314958
    LM3503SQ-16ABCD15004268000639400011814314958
    LM3503SQ-25ABCD15004268000639400011814314958
    LM3503SQ-35ABCD15004268000639400011814314958
    LM3503SQ-44ABCD15004268000639400011814314958
    LM3503SQX-16ABCD15004268000639400011814314958
    LM3503SQX-25ABCD15004268000639400011814314958
    LM3503SQX-35ABCD15004268000639400011814314958
    LM3503SQX-44ABCD15004268000639400011814314958

    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 LM3503.

    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 LM3503 is located at RoHS Status.

    [Information as of 7-Feb-2012]
    Copyright © 2011 National Semiconductor Corporation