AAT3157 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications

The AAT3157 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 AAT3157 is capable of driving six LED channels at a total of 180mA 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' AS2Cwire™ (Advanced Simple Serial Control) serial digital input is used to enable, disable, and set current for each LED with a 16-level logarithmic scale plus four low-current settings down to 50μA for optimized efficiency, with a low housekeeping current of only 50μA. Each output of the AAT3157 is equipped with built-in protection for VOUT short circuit and auto-disable for LED failure 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 AAT3157 is available in a Pb-free, space-saving, thermally-enhanced 16-pin 4x4mm QFN package.

技术特性
  • VIN Range: 2.7V to 5.5V
  • Fully Programmable Current with Single Wire
  • 16 Current Levels
  • Four Low Current Settings Down to 50μA
  • Low IQ (50μA) for Low Current Mode
  • Tri-Mode 1X, 1.5X, and 2X Charge Pump for Maximum Efficiency and VF Coverage
  • Drives up to Three Channels of LEDs
  • No Inductors, Low Noise Operation
  • 1MHz Constant Switching Frequency
  • Small Application Circuit
  • Built-In Thermal Protection
  • Automatic Soft Start
  • IQ <1μA in Shutdown
  • 2.85x3.0mm TSOPJW-12 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
  • AAT3157
AAT3157 典型应用

AAT3157 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
AAT3157 数据资料DataSheet下载:pdf Rev.V2 2 页