The LM27966 is a highly integrated charge-pump-based display LED driver. The device can
drive up to 6 LEDs in parallel with a total output current of 180mA. Regulated internal current
sources deliver excellent current and brightness matching in all LEDs.
The LED driver current sources are split into two independently controlled groups. The
primary group, which can be configured with 4 or 5 LEDs, can be used to backlight the main phone
display. An additional, independently controlled led driver is provided for driving an indicator or
other general purpose LED function. The LM27966 has an I2C compatible
interface that allows the user to independently control the brightness on each bank of LEDs.
The device provides excellent efficiency without the use of an inductor by operating the
charge pump in a gain of 3/2, or in Pass-Mode. The proper gain for maintaining current regulation
is chosen, based on LED forward voltage, so that efficiency is maximized over the input voltage
The LM27966 is available in a small 24-pin Leadless Leadframe WQFN-24 package.
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