LN2113 - natlinear

LN2113 High Efficiency 1.5X Fractional Charge Pumps

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 capacito.

Features

 LN2113: four outputs
 LN2114: six outputs
 20mA full-scale current
 32-position logarithmic scale with digital control
 Low noise constant frequency operation
 33% less input current than doubler charge pump
 High accuracy brightness matching
 Vin range: 2.7v to 5.5v
 IQ <1μa in shutdown
 16-pin QFN, 12-pin TSOPJW package
 Simple serial interface
 Automatic soft start
 Small application circuit
 No inductors
 Regulated output current
 600KHz switching frequency
■ Applications
 LCD backlighting
 MP3/MP4 player
 PDA、Notebook
 Digital camera
 Programmable current source
■ Pa.