AP3156 LED Drivers Diodes Incorporated AP3156 LED Drivers are a low noise, constant frequency charge pump DC/DC converter that uses a tri-mode load switch (1X), fractional (1.5X), and doubling (2X) conversion to maximize efficiency for white LED applications. Diodes Incorporated AP3156 LED driver is capable of driving the LED channels at 120mA maximum from a 2.75V to 5.5V input.