The AAT3340 is a low-noise, constant-frequency chargepump DC/DC converter that uses a dual-mode load switch(1x) and fractional (1.5x) conversion to maximize efficiencyfor white LED applications. The AAT3340 is capableof driving 4 white LEDs at a total of 80mA from a single2.7V to 5.5V input. The current sinks may be operatedindividually or in parallel while driving higher-currentLEDs. A low external parts count (two 1μF flying capacitorsand two small 1μF capacitors at VIN and VOUT) makes theAAT3340 ideal for small battery-powered applications.