LTC3210

• Product Introduction

LTC3210

Main/camera LED controller in a 3mm x 3mm QFN package

peculiarity

• 低噪声充电泵利用自动模式切换提供高效率
• 多模式运作：1x、1.5x、2x
• 单独的全标度电流设定电阻器
• 高达 500mA 的总输出电流
• 用于主 (MAIN) 和照相 (CAM) LED 的单线式 EN (使能)/亮度控制 (8 个亮度等级)
• 用于主显示屏的 64:1 亮度控制范围
• 四个 25mA 低压降主 LED 输出
• 一个 400mA 低压降相机 LED 输出
• 低噪声恒定频率操作
• 低停机电流：3µA
• 内部软起动功能限制启动和模式切换期间的浪涌电流
• 开路/短路 LED 保护
• 无电感器
• 3mm x 3mm 16 引脚塑料 QFN 封装

• description

  The LTC®3210 is a low-noise charge pump DC/DC converter designed to drive 4 main LEDs and a high-current CAM LED for camera illumination. LTC3210 requires only four small ceramic capacitors and two current-setting resistors to form a complete LED power supply and current controller.

  An internal soft-start circuit prevents excessive inrush current during start-up and mode changes. The high switching frequency allows for the use of small external capacitors. Independent main and camera full-scale current setpoints are set by two external resistors. The shutdown mode and current output level are selected via two logic inputs.

  The full-scale current flowing through the LEDs utilizes an external resistor to set. Transform the ENM and ENC pin levels to regulate LED current through an internal counter and DAC. The device is shut down when both the ENM and ENC pins are low and persist for 150μs (typical).

  The charging pump optimizes efficiency based on the voltage across the LED current source. The device is powered on in 1x mode and automatically switches to boost mode when any enabled LED current source begins to enter a voltage drop state. LTC3210 is available in a 3mm x 3mm 16-pin QFN package.

• apply

  • 用于蜂窝电话 / DSC / PDA 的多 LED 照明灯电源