AAT3120 Three-Channel Charge Pump for White LED Applications

The AAT3120 is a low noise, constant frequency charge pump DC/DC converter that uses fractional (1.5X) conversion to improve efficiency for white LED applications. The device can be used to produce eight current levels up to 20mA per channel for up to three channels. 1X load switch mode is also built-in to improve efficiency at low current settings. Low external parts count (two 1μF flying capacitors and two small 1μF capacitors at VIN and OUT) makes the AAT3120 ideally suited for small battery- powered applications. Skyworks' S2Cwire™ (Simple Serial Control™) serial digital input is used to enable, disable, and set current for each LED at eight different levels. The AAT3120 has a thermal management system to protect the device in the event of a short-circuit condition at the output pin. Built-in soft-start circuitry prevents excessive inrush current during start-up. A high charge pump switching frequency enables the use of very small external capacitors. A low current shutdown feature disconnects the load from VIN and reduces quiescent current to less than 1μA. The AAT3120 is available in the very small Pb-free 12-pin TSOPJW package.

技术特性

VIN Range: 2.7V to 5.5V
Fractional Charge Pump Mode
Drives Low-VF and High-VF Type LEDs
Up to Three LED Outputs
Single Wire Programming
Eight Regulated Current Settings
Max 20mA per Channel
Low Noise Constant Frequency Operation
No Inductors
1MHz Switching Frequency
Small Application Circuit
Automatic Soft-Start
Q <1μA in Shutdown
12-Pin TSOPJW Package

应用领域 APPLICATION

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

订购信息 Ordering Information

AAT3120

AAT3120 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
AAT3120 数据资料DataSheet下载:pdf	Rev.V2	2 页