The LM27965 is a highly integrated charge-pump-based dual-display LED driver. The device
can drive up to 9 LEDs in parallel with a total output current of 180mA. Regulated internal current
sinks deliver excellent current and brightness matching in all LEDs.
The LED driver current sinks are split into three independently controlled groups. The
primary group can beconfigurabled with 4 or 5 LEDs, for backlighting a larger main display and the
second group can be configured with 2 or 3 LEDs, for backlighing a smaller secondary display. An
additional, independently controlled led driver is provided for driving an indicator or general
purpose LED. The LM27965 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 LM27965 is available in a small 24-pin WQFN-24 package.
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