AAT3141 High Efficiency 1X/1.5X Fractional Charge Pump for White LED Applications
The AAT3141 is a low noise, constant frequency charge pump DC/DC converter that uses a tri-mode load switch (1X), fractional (1.5X), and doubling (2X) conversion to maximize efficiency for white LED applications. The device produces current levels up to 30mA on each of its four current source outputs to drive various arrangements of LEDs from a 2.7V to 5.5V input. Outputs may be operated individually or in parallel for driving higher-current LEDs. A low external parts count (two 1μF flying capacitors and two small 1μF capacitors at VIN and CP) make the AAT3141 ideally suited for small battery-powered applications. The AAT3141 is equipped with Skyworks' unique AutoBias™ technology which allows individual LEDs to be powered either by charge pump or battery input, determined internally and automatically to maximize the power efficiency even with a large difference in LED forward voltage. Skyworks' Advanced Simple Serial Control™ (AS2Cwire™) digital input is used to enable, disable, and set the LED drive current with a 32-level logarithmic scale LED brightness control. The AAT3141 has a thermal management system to protect the device in the event of a short-circuit condition at an 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. In shutdown mode, the device disconnects the load from VIN and reduces quiescent current to less than 1μA. The AAT3141 is available in the very small, Pb-free 12-pin TSOPJW package.
技术特性
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应用领域 APPLICATION
订购信息 Ordering Information
AAT3141 典型应用
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| 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 |
| AAT3141 数据资料DataSheet下载:pdf | Rev.V2 | 2 页 |
