Maxim's LED backlight driver delivers smallest footprint for larger automotive displays
The MAX20069 from Maxim Integrated Products Automotive is designed to allow infotainment designers to upgrade to bigger, higher resolution displays with greater ease, reduced cost, and smaller solution size. The device integrates four I2C-controlled, 150 mA LED backlight drivers and a four-output thin-film-transistor liquid-crystal display (TFT-LCD) bias in a single chip. The IC can reportedly reduce design footprint up to one-third compared to the closest competitor's parts.
The MAX20069 supports larger screen sizes and higher resolution by providing positive analog supply voltage (PAVVD) and negative analog supply voltage (NAVDD), both of which are required for low-temperature polysilicon panels (LTPS) that deliver higher resolution and lower cost than amorphous silicon panels. The IC also supports the high currents that next-generation displays require, with 150 mA per channel in the four-channel LED driver for 8-inch or larger displays and higher resolutions. It operates over the -40 C to +105 C ambient temperature range and is available in a 6 mm x 6 mm TQFN package.
The unit delivers a high dimming ratio, 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 200 Hz. An easy-to-use I2C interface is intended to quickly pinpoint problems, direct the microcontroller to adjust to conditions or alert the driver of a failure. In addition, 2.2 MHz switching frequency, spread spectrum, and phase-shift capabilities help mitigate interference and emissions.