ADD5205: Four-String White LED Driver

The ADD5205 is a white LED driver for backlight applications based on high efficiency, current mode, step-up converter technology. It is designed with a 0.3 Ω internal switch and 1 MHz fixed operating frequency. The ADD5205 contains four regulated constant current sources for uniform brightness intensity. Each current source is capable of driving up to 25 mA.

The ADD5205 has four parallel strings of multiple series connected LEDs with ±2% current matching. The device provides adjustable current sources that drive up to 25 mA using an external resistor. The LED current can be controlled by a PWM signal input on the PWM pin. An internal circuit translates the PWM signal to an analog signal with an external capacitor and linearly controls the LED current.The ADD5205 has multiple safety protection features to prevent any damage during fault conditions. If one or more LEDs are open, the device disables the faulty current regulator automatically. The internal soft start prevents inrush current during startup. A thermal shutdown protection feature prevents thermal damage.The ADD5205 is available in a low profile, thermally enhanced 3 mm × 3 mm × 0.75 mm, 12-lead lead frame chip scale package (LFCSP) and is specified over the temperature range of −25°C to +85°C.

技术特性
  • White LED driver based on inductive boost converter
    - Input voltage range:
    2.8 V to 18 V
    - Internal compensation
    - 1 MHz fixed operating frequency
    - 28 V fixed overvoltage protection
    - Built-in soft start for boost converter
  • Drives up to 4 LED current sources
    - LED current adjustable up to 25 mA for each channel
    - DC current level brightness control with PWM input
    - LED open fault protection
  • General
    - Thermal shutdown
    - Undervoltage lockout
    - 12-lead, 3 mm × 3 mm × 0.75 mm LFCSP package
技术指标
  • Switching Freq: 1MHz
  • Vin max (V): 18V
  • Vin min (V): 2.18V
  • Package: 12-Lead LFCSP
应用领域
  • Smart PCs, PMPs, tablet PCs, UMPCs, and notebooks
订购指南
产品型号 封装 引脚 温度范围 包装和数量 报价*(100-499) 报价*1000 pcs RoHS
ADD5205ACPZ-RL 产品状态: 量产 LFCSP:LEADFRM CHIP SCALE 12 工业 Reel, 5000 - $ 1.15 Y  材料信息
ADD5205 应用技术支持与电子电路设计开发资源下载
  1. ADD5205 数据手册DataSheet 下载 . pdf(Rev 0, 10/2011 pdf 434kB)
  2. ADI 模拟器件公司比较器产品选型指南 . pdf
  3. Analog Devices, Inc. 美国模拟器件公司产品订购手册 .pdf
  4. 热插拨及电源监控器广告( pdf, 306kb)
  5. 电源监控器与时序控制器 . pdf