MAX8759

Low-Cost, SMBus, CCFL Backlight Controller

Integrated Backlight Controller Optimized to Drive CCFLs Using Resonant Full-Bridge Inverter Architecture


Please check latest availability status for a specific part variant.

Description

The MAX8759 integrated cold-cathode fluorescent lamp (CCFL) inverter controller is designed to drive CCFLs using a full-bridge resonant inverter. The resonant operation ensures reliable striking and provides near-sinusoidal waveforms over the entire input range. The controller operates over a wide input-voltage range of 4.5V to 28V with high power to light efficiency. The device also includes safety features that effectively protect against single-point fault conditions such as lamp-out, secondary overvoltage, and secondary short-circuit faults.

The MAX8759 provides accurate lamp-current regulation (±2.5%) for superior CCFL inverter performance. The lamp current is adjustable with an external resistor; 10:1 dimming range can be achieved by turning the CCFL on and off using a digital pulse-width modulation (DPWM) method, while maintaining the lamp-current constant. The MAX8759 provides three mechanisms for controlling brightness: 2-wire SMBus™-compatible interface, external ambient-light sensor (ALS), or system PWM control. The MAX8759 supports Intel display power-saving technology (DPST) to maximize battery life. The device includes two lamp-current feedback input pins that support dual-lamp applications with a minimum number of external components.

The MAX8759 controls a full-bridge inverter for maximum efficiency and directly drives four external n-channel power MOSFETs. An internal 5.35V linear regulator powers the MOSFET drivers and most of the internal circuitry. The MAX8759 is available in a space-saving, 28-pin, thin QFN package and operates over a -40°C to +85°C temperature range.

MAX8759: Minimal Operating Circuit MAX8759: Minimal Operating Circuit Enlarge+

Key Features

  • Accurate Dimming Control Using SMBus, PWM Interface, or Ambient Light Sensor
  • 10:1 Dimming Range with 256-Step Resolution
  • Resonant-Mode Operation
    • Longer Lamp Life with Near Sinusoidal Lamp-Current Waveform
    • Guaranteed Striking Capability
    • High-Power-to-Light Efficiency
  • Wide Input-Voltage Range (4.5V to 28V)
  • Input Feed-Forward for Excellent Line Rejection
  • ±2.5% Lamp-Current Regulation
  • Adjustable 1.5% Accurate DPWM Frequency
  • Dual Lamp-Current Feedback Inputs
  • Comprehensive Fault Protection
    • Secondary Voltage Limiting
    • Primary Current Limit with Lossless Sensing
    • Lamp-Out Protection with Adjustable Timeout
    • Secondary Short-Circuit Protection
  • Small 28-Pin, 5mm x 5mm, Thin QFN Package

Applications/Uses

  • LCD Monitors
  • Notebooks
Product Reliability Reports: MAX8759.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >

 
Status:
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