Micrel, Inc. Supplier Page
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  • Features
  • Applications
  • Specifications

MIC4833 Dual EL Lamp Drivers Illuminate the Lighting Market

Micrel ImageThe MIC4833 is a low noise dual Electroluminescent (EL) Panel driver used in backlighting applications. The MIC4833 converts a low DC voltage to a high DC voltage using a boost converter and then alternates the high DC voltage across the EL panels using an H-bridge.

The MIC4833 incorporates internal wave-shaping circuitry specifically designed to reduce audible noise emitted by EL panels. The two EL panels may be dimmed by applying a PWM signal to the device. The MIC4833 drives two outputs from a single inductor and requires a minimum number of passive components. It features an operating input voltage range of 2.3V to 5.8 V, making it suitable for 1-cell Li-ion and 2- or 3-cell alkaline/NiCad/NiMH battery applications.

An external resistor may be used to adjust the output voltage slew rate to reduce audible noise. The MIC4833 features separate oscillators for the boost and H-bridge stages to allow independent control. External resistors set the operating frequencies of each stage allowing the EL circuit to optimize efficiency and brightness.


  • Drives two EL panels, up to 4 in2 each at full brightness
  • Independent input control for each of the two panels and allows PWM dimming
  • 220Vpp regulated AC output waveform
  • 2.3V to 5.8V DC input voltage
  • Wave-shaping circuit to reduce audible noise
  • Adjustable slew rate for audible noise reduction
  • Independently adjustable boost converter and EL panel frequency
  • Single inductor to power both panels
  • 0.1µA typical shutdown current
  • 12 pin 3mm x 3mm MLF® package
  • –40°C to +125°C junction temperature range



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    DatasheetRoHS Compliant


  • Mobile Phones
  • MP3 Players/Portable Media Players (PMP)
  • Clocks/Watches
  • Remote Controls
  • Cordless Phones
  • GPS Devices
  • PDAs
  • Typical Application
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    Digi-Key P/N
    Micrel P/N
    Package
    Operating Junction
    Temp. Range
    Lead Finish
    MIC4833YML
    12-pin 3mm x 3mm MLF®
    –40°C to +125°C
    Pb-free


    Absolute Maximum Ratings(1) Operating Ratings(2)
    Supply Voltage (VDD) ................... –0.5V to 6.5V Supply Voltage (VDD) ................................... 2.3V to 5.8V
    Output Voltage (VCS) ................... –0.5V to 130V Panel Drive Frequency(fEL) ................... 100Hz to 1500Hz
    Switch Node (VSW) ...................... –0.5V to 130V Switching MOSFET Frequency (fSW) ..... 35kHz to 350kHz
    Enable Voltage (VENA, VENB) ....... –0.5V to 6.5V Enable Voltage (VENA, VENB) ........................... 0V to VDD
    Voltage (VREL, VRSW, VSLEW) ..... –0.5V to 6.5V Junction Temp. Range (TJ) ...................... –40°C to +125°C
    ESD Rating(3) ................................. ESD Sensitive Package Thermal Impedance
           θJA MLF®-12L ................................................... 60°C/W
     
     
    Notes:
    1. Exceeding the absolute maximum rating may damage the device.
    2. The device is not guaranteed to function outside its operating rating.
    3. Devices are ESD sensitive. Handling precautions recommended. Human body model,
      1.5kΩ in series with 100pF.