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WLED backlight driver

Analog Devices has expanded its LMS (lighting management system) product lineup with the introduction of the ADP8860 WLED (white LED) backlight driver. The WLED is designed to operate with sister LMS products, such as the ADP5520 lighting management system and ADP5588 mobile I/O expander. The device features ambient light sensing, a highly programmable register set and sophisticated fading and dimming options that reduce backlight power dissipation. This flexible architecture simplifies the system designer’s objective to optimise power management in a broad range of low-power, low-voltage products that require backlighting for small-format displays and/or keypads found in consumer, medical, industrial and instrumentation electronics devices. The device supports 1.7 to 3.3V I/O operation for challenging applications, such as maritime and portable navigation devices, radar scanners and consumer handsets, which require consistent display viewing in a variety of ambient lighting environments. The device’s configurable architecture improves ease-of-use by automatically detecting ambient light levels and adjusting backlighting brightness according to changing light conditions. The WLED’s LMS capability enables the device to automatically determine and adjust for the minimum gain required as light level changes and reduces power consumption. Multi-zone lighting capability is also available to support the main display and other displays where significant power savings can be realised while maintaining the required viewing light levels. The device features a parallel configuration and controls up to seven LEDs – six at 30mA maximum and one at 60mA. The device offers sophisticated dimming and fade-in/fade-out capabilities. This flexibility delivers independent LED control to achieve minimum/maximum current and fade-in/fade-out times, or in grouped LED control to offload the processor from fade-in/fade-out duties and conserve power. The single-chip backlight driver enables system designers to quickly and easily upgrade non-LMS devices to provide the desired sophisticated fading and dimming functions, as well as extended battery life.