Diodes Incorporated High Efficiency 1x/2x Charge Pumps are low noise, constant frequency charge pump DC/DC converters that each use a Dual mode load switch (1x), and (2x) conversion for white LED applications. The AL3158 is capable of driving three groups of three LED channels, and the AL3159 is capable of driving nine LED channels, at 20mA from a 2.7V to 5.5V input. The current sinks may be operated using three simple PWM dimming inputs individually or in parallel for driving higher-current LEDs. Low external part counts (one 1μF flying capacitor and two 2.2μF capacitors at VIN and VOUT) make this part ideally suited for small, battery-powered applications. Diodes Incorporated High Efficiency 1x/2x Charge Pumps are used to enable, disable, and dim the LED channels with fixed default current settings at 20mA or other factory programming options available.