The LM3537 is a highly integrated LED driver capable of driving 8 LEDs in parallel for
single display backlighting applications. Independent LED control allows for a subset of the main
display LEDs to be selected for partial illumination applications.
I2C-compatible control allows full configurability of the
backlighting function. The LM3537 provides multi-zone Ambient Light Sensing allowing autonomous
backlight intensity control in the event of changing ambient light conditions. A PWM input is also
provided to give the user a means to adjust the backlight intensity dynamically based upon the
content of the display.
Four integrated LDOs are fully configurable through I2C
capable of addressing point-of-load regulation needs for functions such as integrated camera
modules. The LDOs can be powered from main battery source, or by a fixed output voltage of an
external buck converter (post regulation) leading to higher conversion efficiency.
The LM3537 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
LM3537 is offered in a tiny 30-bump DSBGA package.
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