CP2133 pump equivalent, high efficiency 1x/1.5x fractional charge pump.
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Drives up to 4 LEDs at 30 mA Each Regulated Output Current With 0.5% Matching Over Temperature LED Brightness Control Through PWM Control Signal（0Hz～50KHz）.
The device provides a constant current, set by an external resistor, for each LED. The supply voltage ranges from 2.7 V.
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