MAX1576

PRODUCTION

480mA White LED 1x/1.5x/2x Charge Pump for Backlighting and Camera Flash

Data Sheet (Rev. 1) Product Selection Table
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Overview

  • Powers Up to 8 LEDs
    Up to 30mA/LED Drive for Backlight
    Up to 400mA Total Drive for Flash
  • 85% Average Efficiency (PLED / PBATT) Over Li+ Battery Discharge
  • 0.7% Typical LED Current Matching
  • Adaptive 1x/1.5x/2x Mode Switchover
  • Flexible Brightness Control
    Single-Wire, Serial Pulse Interface (5% to 100%)
    2-Bit (3 Levels) Logarithmic Logic
  • Low Input Ripple and EMI
  • Low 0.1µA Shutdown Current
  • 2.7V to 5.5V Supply Voltage Range
  • Soft-Start Limits Inrush Current
  • Output Overvoltage Protection
  • Thermal-Shutdown Protection
  • 24-Pin Thin QFN, 4mm x 4mm Package

    • The MAX1576 charge pump drives up to 8 white LEDs with regulated constant current for uniform intensity. The main group of LEDs (LED1-LED4) can be driven up to 30mA per LED for backlighting. The flash group of LEDs (LED5-LED8) are independently controlled and can be driven up to 100mA per LED (or 400mA total). By utilizing adaptive 1x/1.5x/2x charge-pump modes and very-low-dropout current regulators, the MAX1576 achieves high efficiency over the full 1-cell lithium-battery voltage range. The 1MHz fixed-frequency switching allows for tiny external components, and the regulation scheme is optimized to ensure low EMI and low input ripple.

    The MAX1576 uses two external resistors to set the main and flash full-scale (100%) LED currents. Four control pins are used for LED dimming by either serial control or 2-bit logic per group. ENM1 and ENM2 set the main LEDs to 10%, 30%, or 100% of full scale. ENF1 and ENF2 set the flash LEDs to 20%, 40%, or 100% of full scale. In addition, connect either pair of control pins together for single-wire, serial pulse dimming control.

    The MAX1576 is available in a 24-pin thin QFN, 4mm x 4mm package (0.8mm max height).

    Applications

    • Camera Phones
    • Cell Phones/Smartphones
    • LCD Backlights
    • LED Camera Flashes
    • PDAs, Digital Cameras, and Camcorders
    MAX1576
    480mA White LED 1x/1.5x/2x Charge Pump for Backlighting and Camera Flash
    MAX1576: Typical Application Circuit
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    Documentation

    Data Sheet 1

    Reliability Data 1

    Design Note 2

    Technical Articles 2

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    Software Resources

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    Hardware Ecosystem

    Parts Product Life Cycle Description
    LED Drivers 2
    MAX1575
    		White LED 1x/1.5x Charge Pump for Main and Sub-Displays
    MAX1582
    		High-Efficiency Step-Up Converters for White LED Main and Subdisplay Backlighting
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    Evaluation Kits

    MAX1576EVKIT

    Evaluation Kit for the MAX1576

    Buy Now View Details

    Features and Benefits

  • MAX1576 Powers Up to 4 Main LEDs and 4 Flash LEDs
    EV Kit Powers 4 Main LEDs and 1 Flash LED
  • 85% Average Efficiency (PLED/PBATT) over Li+ Battery Discharge
  • 0.7% Typical LED Current Matching
  • Adaptive 1x/1.5x/2x Mode Switchover
  • Single-Wire Serial Pulse Interface (5% to 100% Brightness) for Main
  • 2.7V to 5.5V Supply Voltage Range
  • 24-Pin (4mm x 4mm) Thin QFN Package
  • Fully Assembled and Tested

    • Product Details

    The MAX1576 evaluation kit (EV kit) is a fully assembled and tested circuit for evaluating the MAX1576 white LED 1x/1.5x/2x charge pump. This MAX1576 EV kit drives four white LEDs for backlighting and uses four flash LED drivers to drive one flash LED at a high current. In addition to the LED driver circuit, the EV kit includes one pulse-generator circuit and momentary pushbutton switches that are used for testing the single-wire serial pulse-dimming and flash feature of the MAX1576.

    Applications

    • Camera Phones
    • Cell Phones/Smartphones
    • LCD Backlights
    • LED Camera Flashes
    • PDAs, Digital Cameras, and Camcorders
    MAX1576EVKIT
    Evaluation Kit for the MAX1576

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