AAT2842 High Current Charge Pump with S2CwireTM Control and Dual LDO for Backlight and Flash

The AAT2842 is a monolithically integrated dual N-channel high-voltage cascode-clamp lateral TrenchDMOS array. The dual-channel AAT2842 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 AAT2842’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 AAT2842 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 AAT2842 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
  • VIN Range: 2.7V to 26V
  • Integrated 50V Boost Converter
  • Maximum IOUT: 120mA
  • Programmable Switching Frequency
  • 600kHz to 1MHz
  • Up to 93% Efficiency
  • High Efficiency Light-Load Mode
  • Four White LED Strings
  • Programmable Max Current Sink up to 30mA Each
  • ±2% Accuracy (22mA)
  • ±1.5% Matching (22mA)
  • Direct PWM Dimming
  • Automatic Phase Shifting
  • Fast Turn-On/Off
  • ntegrated Fault Protection for
  • ndependent Disable of Open/Shorted LED(s) String(s)
  • Over-Voltage
  • Over-Temperature
  • FAULT Indication for Shorted LED(s) and Over-Temperature
  • Soft-Start Minimizes Inrush Current
  • TDFN34-16 Low Profile Package
    • 40°C to +85°C Temperature Range
应用领域 APPLICATION
  • Camera-Enabled Mobile Devices
  • Digital Still Cameras
  • Multimedia Mobile Phones
订购信息 Ordering Information
  • AAT2842
AAT2842 典型应用

AAT2842 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
AAT2842 数据资料DataSheet下载:pdf Rev.V2 2 页