General Description
The AAT3113 and AAT3114/14A 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 these devices ideally suited for small, battery-powered applications.

FEATUREs
•  AAT3113: Four Outputs
•  AAT3114/14A: Six Outputs
•  20mA Full-Scale Current
•  Simple Serial Control (S2 Cwire) Interface
▪ 32-Position Logarithmic Scale with Digital Control
•  Low Noise Constant Frequency Operation
•  33% Less Input Current Than Doubler Charge Pump
•  High Accuracy Brightness Matching
•  Small Application Circuit
•  Regulated Output Current
•  Automatic Soft Start
• VINRange: 2.7V to 5.5V
• No Inductors
•  600kHz Switching Frequency
• IQ<1µA in Shutdown
•  Temperature Range: -40°C to 85°C
•  12-Pin TSOPJW Package (AAT3113)
•  16-Pin QFN Package (AAT3114/14A)