General Description
The AAT3122 is a low noise, constant frequency charge pump DC/DC converter that uses a dual mode Load Switch (1X) and fractional (1.5X) conversion to increase efficiency in White LED applications. With input voltages ranging from 2.7-5.5 Volts, the device can produce an output current of up to 120mA. A low external parts count (two 1µF flying capacitors and two small bypass capacitors at VIN and OUT) makes the AAT3122 ideally suited for small battery-powered applications.

Features
• VIN Range: 2.7V to 5.5V
• <1µA of Shutdown Current
• 1 MHz Switching Frequency
• Dual Mode 1x and 1.5x Charge Pump for Maximum Efficiency
• Only 4 External components
• Simple Serial Control™ (S2Cwire) Interface
• Low Noise Constant Frequency Operation
• 33% Less Input Current Than Doubler Charge Pumps
• Small Application Circuit
• Regulated Output Current
• Automatic Soft-Start
• No Inductors
• TSOPJW-12 Package
• -40 to +85C° Temperature Range

Applications
• White LED Backlighting
• Programmable Current Source