AAT2862 Backlight LED Driver and Multiple LDO Lighting Management Unit

The AAT2862 is a monolithically integrated dual N-channel high-voltage cascode-clamp lateral TrenchDMOS array. The dual-channel AAT2862 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 AAT2862’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 AAT2862 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 AAT2862 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
  • AS2Cwire Serial Interface
  • Tri-Mode Charge Pump
  • Drives up to Eight LEDs (Backlight/Flash)
  • Programmable Backlight Current Settings
  • 31mA Maximum Current per Channel
  • 32 Linear Current Settings
  • ndependent Main/Sub Settings
  • Programmable Fade-In and Fade-Out
  • Programmable Flash Current
  • 600mA Total Flash Current
  • 16 Linear Current Settings
  • 1- or 2-Channel Configuration
  • 1MHz Switching Frequency
  • Automatic Soft-Start
  • Three Linear Low Dropout Regulators
  • 300mA Output Current
  • 150mV Dropout
  • Programmable Output Voltage from 1.2V to 3.3V
  • Output Auto-Discharge for Fast Shutdown
  • Built-In Thermal Protection
  • Automatic Soft Start
  • 40°C to +85°C Temperature Range
  • TQFN34-24 Package
应用领域 APPLICATION
  • Camera Enabled Mobile Devices
  • Digital Still Cameras
  • Multimedia Mobile Phones
订购信息 Ordering Information
  • AAT2862
AAT2862 典型应用

AAT2862 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
AAT2862 数据资料DataSheet下载:pdf Rev.V2 2 页