AAT3121 High Efficiency 1.5X Fractional Charge Pump for White LED Applications

The AAT3121 is a low noise, constant frequency charge pump DC/DC converter that uses fractional (1.5X) conversion to increase efficiency in white LED applications. With input voltages ranging from 2.7V to 5.5V, 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 AAT3121 ideally suited for small battery-powered applications. Skyworks' Simple Serial Control™ (S2Cwire™) interface is used to enable, disable, and set the LED drive current with a 32-level logarithmic scale LED brightness control. The AAT3121 has a thermal management system to protect the device 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. High switching frequency enables the use of small external capacitors. A low shutdown current feature disconnects the load from VIN and reduces quiescent current to less than 1μA. The AAT3121 provides a single current source output that can be used to drive up to six LEDs at 20mA each. The AAT3121 is available in a Pb-free TSOPJW-12 package and

技术特性

VIN Range: 2.7V to 5.5V
<1μA of Shutdown
Only Four External Components
Programmable LED Brightness
Low Noise Constant Frequency Operation
33% Less Input Current Than Doubler Charge Pump
Small Application Circuit
Regulated Output Current
Automatic Soft Start
No Inductors
TSOPJW-12 Package
-40°C to +85°C Temperature Range

订购信息 Ordering Information

AAT3121

应用领域 APPLICATION

Programmable Current Source
White LED Backlighting

AAT3121 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
AAT3121 数据资料DataSheet下载:pdf	Rev.V2	2 页