AAT3159 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications

The AAT3159 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 AAT3159 is capable of driving up to four LED channels at 20mA per channel from a 2.7V to 5.5V input. The current sinks 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 VOUT) make this part 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 with 16 settings down to 50μA. The low current mode supply current can be as low as 50μA to save power. Each output of the AAT3159 is equipped with built-in protection for VOUT short circuit and auto disable for load short-circuit conditions. Built-in soft-start circuitry prevents excessive inrush current during start-up. A low current shutdown feature disconnects the load from VIN and reduces quiescent current to less than 1μA. The AAT3159 is available in a Pb-free, space-saving 2.85x3.0mm TSOPJW-12 package.

技术特性

Input Supply Voltage Range: 2.7V to 5.5V
Tri-Mode (1X/1.5X/2X) Charge Pump
Maximizes Efficiency
1MHz Constant Switching Frequency
No Inductors, Low Noise Operation
Drives Four Channels of LEDs up to 40mA/ Channel
User-Programmable LED Current
Excellent LED Channel-to-Channel Current Matching
Digitally Programmable LED Current with Single-Wire S2Cwire Interface
16 Current Levels From 40mA to 50μA
Low IQ (50μA) for Low Current Mode Operation
True Load Disconnect in Shutdown; IQ < 1μA
Built-In Thermal Protection
Built-In Auto-Disable for Open LED Circuit
Automatic Soft-Start Minimizes Inrush Startup Current
2.85x3x1mm TSOPJW-14 Package

应用领域 APPLICATION

Color (RGB) Lighting
Programmable Current Sinks
White LED Backlighting
White Photo Flash for Digital Still Cameras

订购信息 Ordering Information

AAT3159

AAT3159 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
AAT3159 数据资料DataSheet下载:pdf	Rev.V2	2 页