National Semiconductor | High-performance Analog

 

 LM3432   
6-Channel Current Regulator for LED Backlight Application 		Click link to Download

Features

  • Dynamic Headroom Control (DHC) output to maximize efficiency when used in conjunction with National Semiconductor's LM3430 Boost Controller for LED Backlighting
  • Current sinking adjustable up to 40mA in each string
  • Fast current switching slew rate, tr = 60ns typical
  • Wide dimming ratio, up to 4000:1 with fDIM = 500Hz
  • High LED driving voltage up to 80V
  • ±2.0% current matching between strings
  • Accepts both Digital and Analog dimming control
  • LED open/short fault indication (For LM3432B, no open fault indication)
  • Over-Temperature Indication
  • Internal Thermal Shutdown with Hysteresis
  • Low profile, thermally enhanced LLP-24 (5x4x0.8mm) and eTSSOP-28 (9.7x6.4x1.1mm) packages (The LM3432B is available in the LLP-24 only)

    • Description

    The LM3432/LM3432B are 6-channel high voltage current regulators which provide a simple solution for LED backlight applications. These devices incorporate six individual current regulator channels to give accurate driving current for each LED string. The string-to-string tolerance is kept within ±2.0%. Additionally, the Dynamic Headroom Control output can communicate with a LM3430 boost regulator to adjust the LED supply voltage to the lowest level needed to keep the string current in regulation, yielding optimal overall system efficiency.

    The 6-channel current sink can be adjusted from 15mA to 40mA by an external resistor. Their output drivers can withstand up to 80V. Digital PWM or analog voltage signal can be used to control the duty cycle of all the channels. With a fast current switching slew rate, tr = 60ns typical, accurate current control and wide dimming ratio during PWM dimming are ensured.

    The LM3432/LM3432B contain LED open/short circuit and over-temperature fault signaling to the system micro-controller (the LM3432B does not include open circuit fault signaling). These devices are available in a low profile, thermally enhanced 24 lead LLP package. The LM3432 is also available in the 28 lead eTSSOP.


    Applications

  • LCD display backlight applications
  • General lighting solutions




    •  

    ParametersValues
    Topology Current Regulator
    Input Min Voltage 6 Volt
    Input Max Voltage 40 Volt
    Output Current 240 mA
    Special Features 6-Channel regulator, dynamic headroom control (with LM3430), current matching between channels, digital and analog dimming
    Adjustable Output Yes
    Dimming Method PWM, Analog
    Power Factor Correction None
    Channels 6 Channels
    Multiple Channel Application Yes
    On/Off Pin Yes
    PowerGood / Error Flag Yes
    Switching Frequency Undefined kHz
    RegType Linear Regulator
    Temperature Min -40 deg C
    Temperature Max 125 deg C
    Automotive Yes
    PowerWise No

    Datasheets
    TitleSizeDateOther
    Language
    LM3432 6-Channel Current Regulator for LED Backlight Application408
    Kbytes    		22-May-08日本語  


    Application Notes
    TitleSizeDateOther
    Language
    AN-1679: Application Note 1679 LED Backlighting Solution with LM3430 and LM34322763
    Kbytes    		18-Sep-07 

    Part Number(s)
    (NSID)    		Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM3432BSQE/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    DIGI-KEYWorldwide513
    FARNELLEurope and Asia230
    MOUSERWorldwide250
    NEWARKAmericas230
    		$1.60 each at 1K+ pcsreel
    of
    250
    LM3432MH/NOPB


    RoHS Status

    TSSOP EXP PAD    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide8
    DIGI-KEYWorldwide753
    FARNELLEurope and Asia297
    MOUSERWorldwide240
    NEWARKAmericas132
    TAYLORAmericas8
    		$1.60 each at 1K+ pcsrail
    of
    48
    LM3432MHX/NOPB


    RoHS Status

    TSSOP EXP PAD    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$1.60 each at 1K+ pcsreel
    of
    2500
    LM3432SQ/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide1000
    AVNET-EMWorldwide1000
    DIGI-KEYWorldwide1362
    FARNELLEurope and Asia835
    MOUSERWorldwide1000
    NEWARKAmericas835
    TAYLORAmericas1000
    		$1.60 each at 1K+ pcsreel
    of
    1000
    LM3432SQE/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    DIGI-KEYWorldwide0
    FARNELLEurope and Asia195
    MOUSERWorldwide250
    RS COMPONENTSWorldwide105
    		$1.60 each at 1K+ pcsreel
    of
    250
    LM3432SQX/NOPB

    LM3432SQX

    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$1.60 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 LM3432.

    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 LM3432 is located at RoHS Status.

    Part Number(s)
    (NSID)    		Weight
    (milligrams)    		TypePinsMSL RatingPeak ReflowRoHS
    Status    		CAD SymbolsModelsPackage
    Marking
    Format
    LM3432BSQE/NOPB

    		52.754
    		LLP241260DetailDownloadN/A
    		NS
    UZXYTT
    3432BSQ
    LM3432MH/NOPB

    		117.59
    		TSSOP EXP PAD283260DetailDownloadN/A
    		NSUZXYTTE#
    LM3432
    MH
    LM3432MHX/NOPB

    		117.59
    		TSSOP EXP PAD283260DetailDownloadN/A
    		NSUZXYTTE#
    LM3432
    MH
    LM3432SQ/NOPB

    		52.754
    		LLP241260DetailDownloadN/A
    		NS
    UZXYTT
    L3432SQ
    LM3432SQE/NOPB

    		52.754
    52.97
    		LLP241260DetailDownloadN/A
    		NS
    UZXYTT
    L3432SQ
    LM3432SQX/NOPB

    LM3432SQX
    		52.754
    52.97
    		LLP241
    1    		260
    260    		DetailDownloadN/A
    		NS
    UZXYTT
    L3432SQ

    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 LM3432.

    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 LM3432 is located at RoHS Status.

    Design Tools
    TitleSizeDate
    Article - Methods and Features of LED Drivers  

    CAD Symbols and Models
    Download LM3432 CAD Symbols
    		 Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM3432BSQEABCD150XV2036010011554964327875145
    LM3432MHABCD150XV2036010011554964327875145
    LM3432MHXABCD150XV2036010011554964327875145
    LM3432SQABCD150XV2036010011554964327875145
    LM3432SQEABCD150XV2036010011554964327875145
    LM3432SQXABCD150XV2036010011554964327875145

    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 LM3432.

    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 LM3432 is located at RoHS Status.

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