peculiarity
双高边电流源允许阴极接地的LED操作
准确和可编程LED的电流从28.125毫安1.8A
优化的闪光电流在低电池电压条件下
独立的LED电流源可编程
效率> 90％
超小型（总）解决方案的尺寸：
四种工作模式：火炬，闪光灯，隐私指示，和消息指示器
4位ADC为V LED监测
电池的电压检测和电流缩减规模
LED热感应和目前的规模回
五金Flash和火炬启用
双同步输入射频功率放大器脉冲事件
LED和输出断接功能在关机期间
开路和短路LED检测
400 kHz的我 2 C兼容接口
有源低的硬件复位
16焊球（1.97毫米x1.97毫米x0.6毫米）的micro SMD
illustrate
The LM3559 is a 2MHz fixed-frequency synchronous boost converter with two 900 mA constant high-current white LEDs current driver. Dual high-side current sources allow cathode-grounded LED operation and provide flash current 1.8A that can be side-by-side. Adaptive regulation method, ensuring that the current is still regulated for each LED to maximize efficiency.
The LM3559 is controlled via my 2C compatible interface. Features include: a built-in 4-position ADC to monitor the voltage of the LEDs, independent hardware flash LED current control, the ability to allow a logic input to trigger flash pulses, dual Tx inputs to force into a low-current torch allow mode of flash pulse RF power amplifier events or other high-current conditions, a comprehensive comparison designed to monitor NTC thermistors and provide LED current interrupts, input voltage monitors to monitor low battery conditions, The flash current scale back function is synchronized with the active monitoring of the battery voltage and the optimized flash current under low battery voltage conditions. In addition, the active high HWEN input provides a hardware shutdown in case of system software failure.
A 2MHz switching frequency, overvoltage protection, and adjustable current limit allow for the use of slim, flat (1μH or 2.2μH) inductors and ceramic capacitors (10μF). The device can be packaged in an ultra-small 16-bump (1.97 mm x 1.97 mm x 0.6 mm) micro SMD package and operates over a temperature range of -40°C to +85°C.
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Camera phone LED flash
White LED bias