AAT2847 Four-Channel Backlight Driver with Dual LDOs

The AAT2847 is a monolithically integrated dual N-channel high-voltage cascode-clamp lateral TrenchDMOS array. The dual-channel AAT2847 monolithically integrates both current-sink (CS) and high-voltage cascode-clamp (CC) power MOSFETs required for reliably driving a large series string of LEDs as used in a variety of lighting and display backlight applications. The AAT2847’s low-voltage current-sink (CS) device, required for closed-loop current control in large panel LED driver applications, is constructed using Skyworks' robust lateral TrenchDMOS process featuring superior hot carrier performance needed for reliable constantcurrent operation. It has a low on resistance, typically 1.5Ω, facilitating constant current operation over a wide dynamic range. The low-voltage current-sink Lateral TrenchDMOS process features a low threshold voltage (VGS(ON)) and can be driven directly from a 5V supply. The high-voltage cascode-clamp TrenchDMOS device has a drain-to-source voltage rating of 150V. With a 12V gate drive, it exhibits a typical on-resistance of 5Ω. In high-voltage LED backlighting applications for TVs and large-screen LCD panels, the AAT2847 TrenchDMOS array allows control of two series strings of LEDs with up to 40 LEDs per string. Each series connected TrenchDMOS pair comprises a current sink device with its gate actively driven by a backlight driver IC (such as the AAT2430A-1 or the AAT2405). To facilitate direct temperature measurement of the AAT2847 in a system, a series connected string of P-N junction diodes is included with both anode and cathode connections available separate from the supply.

技术特性
  • Input Voltage Range: 2.7V to 5.5V
  • Four-Channel LED Driver:
  • Tri-Mode Charge Pump
    ▪ Up to 20mA/Channel
  • Easy Control with Single Wire Interface
  • 16 Current Levels
  • Four Low Current Settings Down to 50μA
  • Low IQ (50μA) for Low Current Mode
  • >90% Peak Efficiency
  • Dual, 200mA LDOs
  • User-Programmable Outputs: AAT2847-EE
  • Fixed Output Voltages
  • AAT2847-QG: 2.8V and 1.5V
  • AAT2847-QI: 2.8V and 1.8V
  • Automatic Soft-Start
  • Over-Temperature Protection
  • Available in 3x4mm TQFN34-20 Package
  • 40°C to +85°C Temperature Range
应用领域 APPLICATION
  • Camera Function Power Supplies
  • Camera Phone Displays
  • LCD Modules
  • White LED Backlighting
订购信息 Ordering Information
  • AAT2847
AAT2847 典型应用

AAT2847 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
AAT2847 数据资料DataSheet下载:pdf Rev.V2 2 页