LED Backlight Driver with Integrated LCD Bias Delivers Smallest Footprint for Larger Automotive Displays

Automotive infotainment designers can now upgrade to bigger, higher resolution displays with greater ease, reduced cost and smaller solution size with the MAX20069 from Maxim Integrated Products, Inc. The MAX20069 provides the industry’s first solution integrating four I²C-controlled, 150mA LED backlight drivers and a four-output thin-film-transistor liquid-crystal display (TFT-LCD) bias in a single chip. The IC can reduce design footprint up to one-third compared to the closest competitor’s parts.

Automotive displays are growing larger and more sophisticated as vehicle manufacturers lure buyers with greater information and entertainment options. Market research suggests a 39 percent compound annual growth rate for the 8-inch display market in vehicle instrument clusters, center stack and heads-up display systems. Instrument clusters are expected to migrate to 12.3-inch displays soon. As a result, automotive infotainment system designers will require power solutions with precision, flexibility and small overall solution size to meet increasingly complex system requirements.

Key Advantages

• High Integration: Reduces design footprint, providing TFT-LCD bias with four rails plus four 150mA LED backlight drivers.
  • Single board supports panels from multiple manufacturers through a resistor or I²C programmable sequencing to further reduce solution size.
  • Utilizes 25 percent of the microcontroller (MCU) register bits versus closest competitor’s solution, eliminating the need for a more powerful and costlier MCU in display designs.
• Performance: Delivers twice the dimming ratio compared to the closest competitor’s offering, maintaining panel readability during transition to different light conditions; MAX20069 supports increased resolution through a 10,000:1 pulse-width modulation (PWM) dimming ratio at 200Hz.
• Safety and Built-in Diagnostics: An easy-to-use I²C interface quickly pinpoints problems, directing the microcontroller to adjust to conditions or alert the driver of a failure.
• Electromagnetic Interference (EMI) Mitigation: 2.2MHz switching frequency, spread spectrum and phase-shift capabilities help mitigate interference and emissions.

“Automotive manufacturers are using more screens, larger panels and brighter displays across several vehicle lines to support a safer and more engaging experience on the road,” said Szukang Hsien, executive business manager, Automotive Business Unit, Maxim Integrated. “Maxim’s integrated LED backlight driver and TFT-LCD bias solution supports newer panel types to help automotive manufacturers adopt lower cost yet higher resolution panels with smaller solution size and a high level of integration.”