AAT3194 High Efficiency 1.5X Fractional Charge Pump For White LED Applications

The AAT3194 is a 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 IN and OUT) makes these devices ideally suited for small, battery-powered applications. Skyworks' Simple Serial Control™ (S2Cwire™) interface is used to enable, disable, and set the LED drive current for 32-level logarithmic scale LED brightness control. The AAT3194 has 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-current shutdown feature disconnects the load from VIN and reduces quiescent current to less than 1μA. The AAT3194 is available in a Pb-free 12-pin TSOPJW package.

技术特性

VIN Range: 2.7V to 5.5V
20mA Full-Scale Current
Simple Serial Control (S2Cwire) 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
No Inductors
600kHz Switching Frequency
IQ <1μA in Shutdown
Temperature Range: -40°C to 85°C
12-Pin TSOPJW Package

应用领域 APPLICATION

Programmable Current Source
White LED Backlighting

订购信息 Ordering Information

AAT3194

AAT3194 典型应用

应用技术支持与电子电路设计开发资源下载	版本信息	大小
AAT3194 数据资料DataSheet下载:pdf	Rev.V2	2 页