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  4. Step-Up (Boost) LED Drivers
  5. MAX1579

Data Sheet Rev. 1
PDF
CN | JP

Overview

Features and Benefits

  • Four Regulators in One Package
  • Bias Power Using Charge Pumps
    +5V at 25mA for Source Driver`
    +15V at 100µA for VON
    -10V at 100µA for VOFF
    No External Diodes Required
    Output Sequencing
    POS, NEG, and MAIN Are Autodischarged During Shutdown
  • LED Backlight Power Using Boost Converter
    Series LED Connection for Uniform Illumination
    Supports Up to 8 LEDs at 25mA (max)
    900mW (max) Power
    PWM or Analog Dimming Control
    Overvoltage Protection
    Low Input/Output Ripple
    Soft-Start with Zero Inrush Current
    Fast 1MHz PWM Operation for Small Component Size
    Temperature Derating Function (MAX1579)
  • High Efficiency
    Bias: 83% (5.0V at 25mA, 15V/-10V at 100µA)
    LED: 84% (6 LEDs at 20mA)
  • Uses Only Ceramic Capacitors and Only One Inductor
  • Independent Enable Inputs for LED and Bias Power
  • Thermal-Shutdown Protection
  • 1µA Shutdown Current
  • Tiny 4mm x 4mm Thin QFN Package

    • Product Details

    The MAX1578/MAX1579 provide four regulated outputs to meet all the voltage requirements for small activematrix TFT-LCD displays in handheld devices where minimum external components and high efficiency are required. Each device consists of three advanced charge pumps for LCD bias power and a step-up converter for driving up to 8 series white LEDs for backlighting. The input voltage range is from 2.7V to 5.5V.

    The charge pumps provide fixed +5V, +15V, and -10V for the LCD bias circuits. No external diodes are needed. A high-efficiency, fractional (1.5x/2x) charge pump followed by a low-dropout linear regulator provides +5V to power the source driver. Automatic mode changing achieves the highest conversion efficiency. Two multistage, high-voltage charge pumps generate +15V and -10V to provide VON and VOFF, respectively. Utilizing a unique clocking scheme and internal drivers, these charge pumps eliminate parasitic charge-current glitches and reduce maximum input current, resulting in low electromagnetic emissions. The outputs are sequenced during startup and shutdown. In shutdown, the outputs are discharged to zero.

    The high-efficiency inductor step-up converter drives up to 8 white LEDs in series with a constant current to provide backlighting. The series connection allows the LED currents to be identical for uniform brightness and minimizes the number of traces to the LEDs. The MAX1578 regulates constant LED current over the entire temperature range. The MAX1579 features a temperature derating function to avoid overdriving the white LEDs during high ambient temperatures, enabling higher drive current below +42°C.

    The MAX1578/MAX1579 are available in space-saving 24-lead 4mm x 4mm thin QFN packages.

    Applications

    • Internet Appliances
    • LCD Displays with White LED Backlight
    • PDAs, Palmtops
    • Smartphones

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    At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

    Documentation & Resources

  • View All (2)
  • Data Sheets (1)
  • Reliability Data (1)
    • Document Type

    Design Resources

    ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

    Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
    MAX1579ETG+ Material Declaration Reliability Data 24-LFCSP-4X4X0.75
    MAX1579ETG+T Material Declaration Reliability Data 24-LFCSP-4X4X0.75
    Wafer Fabrication Data MAX1579 Reliability Data

    Support & Discussions

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