National Semiconductor | High-performance Analog

 

 LM3553   

1.2A Dual Flash LED Driver System with I2C Compatible Interface from the PowerWise® Family
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Features

  • Accurate and Programmable LED Current up to 1.2A in 128 Steps
  • Total Solution Size < 30mm 2
  • 90% Peak Efficiency
  • Drives 2 LEDs in Series with 1.2A from 5V Input
  • Drives 2 LEDs in Series with 600mA from 3.0V Input
  • Drives 1 LED with 1.2A from 3.0V Input
  • Adjustable Over-Voltage Protection Allows for Single or Series LED Operation
  • Four Operating Modes: Torch, Flash, Indicator, and Voltage Mode (4.98V)
  • Programmable Flash Pulse Safety Timer in 16 Steps
  • TX Input Ensures Synchronization with RF Power Amplifier Pulse or Prevents LED from Overheating
  • LED Disconnect During Shutdown
  • Flash/Imager Synchronization via FEN Pin
  • Active Low Hardware Reset
  • Multi-Function Pin ( ^RESET and GPIO)
  • Low Profile 12-pin LLP Package (SDF12A: 3mm x 3mm x 0.8mm, 0.4mm pitch)
  • Description

    The LM3553 is a fixed frequency, current mode step-up DC/DC converter with two regulated current sinks. The device is capable of driving loads up to 1.2A from a single-cell Li-Ion battery.

    One or more high current flash LEDs can be driven in series either in a high power Flash mode or a lower power Torch mode controlled by either an internal register or the FEN pin. Additionally a low current (20mA) indicator mode and a fixed output voltage mode are also available.

    The LM3553 has 128 current levels and 16 flash safety timer durations that are user adjustable via an I 2C compatible interface. Internal soft-start eliminates large inrush currents at start-up. Over-voltage protection circuitry and 1.2MHz switching frequency allow for the use of small, low-cost output capacitors with lower voltage ratings.

    The LM3553 includes a TX pin that forces Torch mode during a flash event allowing for synchronization between the RF power amplifier and Flash/Torch modes. It also includes a multi-function pin (M/F) that can serve as a GPIO and a hardware RESET pin.

    The LM3553 is available in National's 3mm by 3mm LLP12 package.


    Applications

  • Camera Phone LED Flash
  • Smartphone and PDA Flash
  • LED Backlight


  • Typ App Update

     

    ParametersValues
    Regulated LEDs 2
    Total LED Current 1200 mA
    Boost Type Inductive
    Switching Frequency 1250 kHz
    Efficiency (peak) 90 %
    Input Min Voltage 2.7 Volt
    Input Max Voltage 5.5 Volt
    LED Configuration Parallel
    Current Matching Perfect
    OutputMax Voltage 18.9 Volt
    Supply Current 1 mA
    Switching Type Fixed Freq
    Special Features I2C Interface, 128 Flash Current Levels, Parallel or Series LED Compatible
    PWM BrightCtrl No
    Analog-V BrightCtrl No
    Ambient Light Compensation No
    RGB-LED No
    Temperature Min -30 deg C
    Temperature Max 85 deg C
    RegType WhiteLED Driver
    PowerWise Yes

    Datasheets
    TitleSizeDateOther
    Language
    LM3553 1.2A Dual Flash LED Driver System with I2C Compatible Interface397
    Kbytes
    6-Mar-08   


    Application Notes
    TitleSizeDateOther
    Language
    AN-1780: Application Note 1780 LM3553 1.2A Dual Flash LED Driver System with I2C Compatible Interface1427
    Kbytes
    12-Mar-08 

    Part Number(s)
    (NSID)
    Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM3553SD/NOPB


    RoHS Status


    LLP
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide1785
    DIGI-KEYWorldwide1404
    FARNELLEurope and Asia515
    MOUSERWorldwide1000
    NEWARKAmericas515
    TAYLORAmericas1785
    $1.00 each at 1K+ pcsreel
    of
    1000
    LM3553SDX/NOPB


    RoHS Status


    LLP
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    $1.00 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 LM3553.

    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 LM3553 is located at RoHS Status.

    Part Number(s)
    (NSID)
    DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM3553SDEV
    1.2A Dual Flash LED Driver System with I2C Compatible InterfaceFull production


     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    MOUSERWorldwide1
    $123.00 each1

    Description:

    The LM3553 is a fixed frequency, current mode step-up DC/DC converter with two regulated current sinks. The device is capable of driving loads up to 1.2A from a single-cell Li-Ion battery.

    One or more high current flash LEDs can be driven in series either in a high power Flash mode or a lower power Torch mode controlled by either an internal register or the FEN pin. Additionally a low current (20mA) indicator mode and a fixed output voltage mode are also available.

    The LM3553 has 128 current levels and 176 flash safety timer durations that are user adjustable via an I2 C compatible interface. Internal soft-start eliminates large inrush currents at start-up. Over-voltage protection circuitry and 1.2MHz switching frequency allow for the use of small, low-cost output capacitors with lower voltage ratings.

    The LM3553 is an asynchronous step-up DC/DC converter with an I2C compatible control interface designed for white LED Flash applications. The evaluation board is setup to drive two white flash LEDs with a series flash current of 500mA. Flash duration and current can both be configured by adjusting values stored in the internal control registers. The LM3553 is available in a 3 mm by 3mm LLP package.

    Features:

    • Accurate and Programmable LED Current up to 1.2A in 128 Steps
    • Total solution Size <30mm2
    • 90% Peak Efficiency
    • Drives 2 LEDs in Series with 1.2A from 5V input
    • Drives 2 LEDs in Series with 600mA from 3.0V Input
    • Drives 1 LED with 1.2A from 3.0V Input
    • Adjustable Over-Voltage Protection Allows for Single or Series LED Operation
    • Four Operating Modes: Torch, Flash, Indicator, and Voltage Mode (4.98V)
    • Programmable Flash Pulse Safety Timer in 16 Steps
    • TX Input Ensures Synchronization with RF Power Amplifier Pulse or Prevents LED from Overheating
    • LED Disconnect During Shutdown
    • Flash/Imager Synchronization via FEN Pin
    • Active Low Hardware Reset
    • Multi-Function Pin (RESET and GPIO)
    • Low Profile 12-pin LLP Package (SDF12A: 3mm x 3mm x 0.8mm, 0.4mm pitch)

    Applications:

    • Camera Phone LED Flash
    • Smartphone and PDA Flash
    • LED Backlight



    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
    LM3553SD/NOPB

    21.112
    LLP123260DetailDownloadN/A
    ZXYTT
    L3553
    LM3553SDX/NOPB

    21.112
    LLP123260DetailDownloadN/A
    ZXYTT
    L3553

    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 LM3553.

    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 LM3553 is located at RoHS Status.

    [Information as of 7-Feb-2012]