LTC3212

LTC3212RGB LED驱动器和电荷

特点

• Power and Current Control for Driving RGB LEDs 驱动RGB LED的功率和电流控制
• Individually Programmable Current Sources 独立的可编程电流源
• 1x or 2x Mode, Low Noise, Constant Frequency Charge Pump 1x或2x模式，低噪声，恒定频率的电荷泵
• Single Wire Enable Control for All LEDs 单线控制所有LED启用
• White Mode Adjusts R, G, B Currents for White Light黑白模式调整的R，G，乙电流白光
• 25mA Maximum LED Current 25毫安最大的LED电流
• VIN Range: 2.7V to 5.5V VIN范围：2.7V至5.5V
• Automatic Soft-Start, Mode Switching and Output Disconnect in Shutdown Mode自动软启动，模式转换和输出在停机模式断开
• Available in 12-Lead (3mm × 2mm) DFN Package提供12引线（3毫米×2毫米）DFN封装
• 描述

  The LTC3212 is a low noise charge pump RGB LED driver capable of driving three LEDs up to 25mA each from a 2.7V to 5.5V input. LTC3212是一款低噪声电荷泵RGB LED驱动器能够驱动三个LED从2.7V至5.5V输入至25mA每个。 Low external part count (one flying capacitor, two bypass capacitors and one to three programming resistors) makes the LTC3212 ideally suited for small, battery-powered applications.低外部元件数量（一个跨接电容器，两个旁路电容器和一至三年的编程电阻）使LTC3212非常适合为小型，电池供电的应用。

  Built-in soft-start circuitry prevents excessive inrush current during start-up and mode switching.内置软启动电路，防止过大的浪涌电流在启动和模式切换。 High switching frequency enables the use of small external capacitors.高开关频率允许使用小的外部电容器。 The charge pump shuts down to a high impedance mode to prevent LED leakage while the LTC3212 is off.电荷泵关闭，以防止LED的泄漏，而LTC3212是关闭一个高阻抗模式。

  Each LED may be individually turned on or off via a single pin interface.每个LED可以单独打开或关闭通过单引脚接口。 The current through the LEDs may be individually programmed with resistors or may share a single programming resistor.通过LED的电流可单独编程电阻或可能共享一个单一的编程电阻。 White mode adjusts the red, green and blue LED current ratios for a white light when all three LEDs are programmed to be on.黑白模式调整编程时，所有三个指示灯是红色，绿色和蓝色LED白光的电流比。

  LED currents are regulated using internal low dropout current sources.使用内部低压差电流源LED电流调节。 Automatic mode switching optimizes effi ciency by monitoring the LED current drivers and switches mode only when dropout is detected.自动模式切换优化效率，通过监视LED电流驱动器和开关模式，只有当检测辍学。 The part is available in a 3mm × 2mm 12-lead DFN package.一部分是在一个3mm×2mm的12引线DFN封装

  应用

  • Cellular Phones手机
  • Media Players媒体播放器
  • RGB Back Lights RGB背光灯