Recently, ON Semiconductor has released the NCP5890, a lighting management device that integrates LCD backlighting, fun light controls and ambient light sensing in a 3mm x 3mm x 0.55mm µQFN-16 package. It targets compact smart phone and portable media player applications.
With its 30V output capability, the device drives LEDs in series to achieve homogeneous backlight over the LCD screen. At the same time, it controls three sets of white LEDs or RGB LEDs to create light patterns on keypads or chassis in a unique combination with backlighting. The driver also extends battery life by adjusting the backlight current based on the ambient light level.
Having high overall power efficiency of up to 90 percent at 1.3MHz oscillator frequency, the NCP5890 inductive boost LED driver renders up to 30V at output. It can sustain eight LEDs in series for LCD backlight and fun lighting. The device supports ambient light sensing, a feature needed in smart phones to lower power use and increase user comfort.
The NCP5890 also has a built-in gradual dimming that produces fade-in and fade-out effects. Both ambient light sensing and gradual dimming are automated built-in functions that can be activated with I2C commands. The device backs I2C protocol with two separate address options. The integrated driver also stretches battery power with a true cut-off function that limits the leakage output current in shut-down mode.
