AAT3134(2004) Datasheet PDF - Analog Technology Inc

General Description
The AAT3134 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 maximize efficiency for White LED applications. The device can be used to produce current levels up to 20mA in each of its six outputs to drive LEDs from a 2.7V to 5.5V input. Outputs may be operated individually or paralleled for driving higher-current LEDs. Low external parts counts (two 1µF flying capacitors and two small 1µF capacitors at VIN, and OUT) make the AAT3134 ideally suited for small battery-powered applications.

FEATUREs
• VIN Range: 2.7 - 5.5 Volts
• < 1.0µA of Shutdown
• 1 MHz Switching Frequency
• Fully Independent Display Lighting
• Dual Mode 1x and 1.5x Charge Pump for Maximum Efficiency
• Drives Low-VF & High-VF Type LEDs
• Up to Six 20mA Outputs
• Multi Position Brightness Scale with Digital Control
• Low Noise Constant Frequency Operation
• Small Application Circuit
• Regulated Output Current
• Automatic Soft-Start
• No Inductors
• 16-pin QFN package
• -40 to +85°C Temperature range

APPLICATIONs
• White LED Backlighting
• White Photo-Flash for DSCs
• Color (RGB) Lighting
• Programmable Current Source