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MAX8722C
Low-Cost CCFL Backlight Controller

High-Efficiency, IC-Optimized CCFL Controller for Portable Applications


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Status
Active: In Production.

Description
FULL DATA SHEET (PDF, 560kB)
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The MAX8722C integrated backlight controller is optimized to drive cold-cathode fluorescent lamps (CCFLs) using a full-bridge resonant inverter architecture. Resonant operation maximizes striking capability and provides near-sinusoidal waveforms over the entire input range to improve CCFL lifetime. The controller operates over a wide input voltage range (4.6V to 28V) with high power to light efficiency. The device also includes safety features that effectively protect against many single-point fault conditions including lamp-out and short-circuit faults.

The MAX8722C achieves 10:1 dimming range by "chopping" the lamp current on and off using a digital pulse-width modulation (DPWM) method. The DPWM frequency can be accurately adjusted with a resistor or synchronized to an external signal. The brightness is controlled by an analog voltage on the CNTL pin. The device directly drives the four external n-channel power MOSFETs of the full-bridge inverter. An internal 5.4V linear regulator powers the MOSFET drivers, the DPWM oscillator, and most of the internal circuitry. The MAX8722C is available in a low-cost, 24-pin QSOP package and operates over a -40°C to +85°C temperature range.

An evaluation kit is available:  MAX8722EVKIT  

Key Features   Applications/Uses
  • Synchronized to Resonant Frequency
    • Longer Lamp Life
    • Guaranteed Striking Capability
    • High Power to Light Efficiency
  • Wide Input Voltage Range (4.6V to 28V)
  • Input-Voltage Feed-Forward for Excellent Line Rejection
  • Accurate Dimming Control with Analog Interface
  • 10:1 Dimming Range
  • Adjustable Accurate DPWM Frequency with Sync Function
  • Adjustable Lamp Current Rise and Fall Time
  • Secondary Voltage Limit Reduces Transformer Stress
  • Lamp-Out Protection with Adjustable Timeout
  • Secondary Overcurrent Protection with Adjustable Timeout
  • Low-Cost, 24-Pin QSOP Package

 
  • LCD Monitors
  • LCD TVs
  • Notebook Computer Displays

    Key Specifications:  CCFL Controllers
    Part Number Features VIN
    (V)
    VIN
    (V)
    Topology Channels Dimming Interface Freq. EV Kit Package/Pins Smallest Available Pckg.
    (mm2)
    Oper. Temp.
    (°C)
    Price
    min max max w/pins See Notes
    MAX8722C 
    All N-FET Drive
    Synchonizable
    4.6 28 Full-Bridge 1
    Analog
    DPWM
    Resonant Yes
    QSOP/24
    54 -40 to +85 $3.93 @1k
    See All CCFL Controllers (17)

    Diagram
    MAX8722C: Typical Operating Circuit
    Typical Operating Circuit

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    Document Ref.: 19-3321; Rev 3; 2009-03-30
    This page last modified: 2009-07-30


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