LN2114

LN2113/4 High Efficiency 1.5X Fractional Charge Pumps For White LED Applications ■ General Description The LN2113 and LN2114 are low noise, constant frequency charge pump DC/DC converters that use fractional (1.5X) conversion to increase efficiency in white LED applications. The devices can be used to produce current levels up to 20mA for each output from a 2.7V to 5.5V input. A low external parts count (two 1μF flying capacitors and two small bypass capacitors at VIN and OUT) makes the LN2113/LN2114 ideally suited for small battery-powered applications. Simple Serial Interface is used to enable, disable, and set the LED drive current for 32-level logarithmic scale LED brightness control. LN2113/LN2114 devices have a thermal management system for protection in the event of a short-circuit condition on any of the output pins. Built-in soft-start circuitry prevents excessive inrush current during start-up. A high switching frequency enables the use of small external capacitors. A low...