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LTC3452
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LTC3452

  • 所属类别：LED驱动
  • 产品名称：同步降压-升压型 主/相机白光 LED 驱动器
  • 厂商：LT
  • 生产批号：11+
  • 封装：QFN-20
  • 库存状态：有库存
  • 库存量：20000
  • 最低订购量：1
  • 详细资料：点击查找LTC3452的pdf资料
  • 点击询价
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  • Product Introduction

LTC3452 Synchronous buck-boost main/camera white LED drivers

peculiarity

  • 高效率：在整个锂离子电池范围内 ≥85%
  • 宽 VIN 范围：2.7V 至 5.5V
  • 独立主/相机电流控制
  • 高达 425mA 的连续输出电流
  • 内部软起动
  • 开路/短路 LED 保护
  • PWM 亮度控制
  • LED 电流匹配误差通常
  • 1MHz 恒定频率操作
  • 低停机电流：6.5µA
  • 过热保护

    description

    LTC®3452 是一款同步降压-升压型 DC/DC 转换器，专为从单节锂离子电池输入来驱动两组白光 LED 而优化。在低功率 LED 组中，该器件可驱动多达 5 个并联的 LED，每个 LED 的驱动电流高达 25mA，而在高功率 LED 组中，可驱动两个 LED，每个 LED 的驱动电流高达 150mA (或者一个 LED，驱动电流为 300mA)。根据输入电压和 LED 最大正向电压的不同，稳压器可工作在同步降压、同步升压或降压-升压模式。通过检测哪个 LED 在其设定电流条件下需要最大的正向压降进而调节共享输出电压以实现最低压差，可获得最佳效率。在锂离子电池的整个可用范围内 (2.7V 至 4.2V) 可实现 85% 的效率。

    每个 LED 显示屏的最大 LED 电流可利用单个外部电阻器来设置。双使能引脚允许在低功率 LED 组中进行 PWM 亮度控制，并在高电流 LED 组中进行独立的接通/关断控制 (最适合于 LED 照相闪光灯应用)。在停机模式中，电源电流仅为 6.5µA。

    1MHz 的高恒定工作频率允许采用小型外部电感器。LTC3452 采用扁平 (高度仅为 0.75mm) 的耐热增强型 20 引脚 (4mm x 4mm) QFN 封装。

  • apply

    • 蜂窝电话
    • 数码相机
    • PDA
    • 便携式设备
    •  
  • 小巧的耐热增强型 20 引脚 (4mm x 4mm) QFN 封装
  •  

LTC3452-related ICs include:


Model Manufacturers lot number encapsulation illustrate
LTC3452 LT 11+ QFN-20 Synchronous buck-boost main/camera white LED driver
3452-G600 3M 10+   IDC
3452-7616 3M 10+   IDC
3452-7600 3M 10+   IDC
3452-7000 3M 10+   IDC
3452-6616 3M 10+   IDC
3452-6600 3M 10+   IDC
3452-6016 3M 10+   IDC
3452-6000 3M 10+   IDC
PEF3452HV1.3 Infineon 03+ QFP-44 Brand new original
M34520 Mitsubishi N／A QFP New original stock in stock
M34520MB-074FP Panasonic N／A QFP New original stock in stock
TMS3452N2L TI 84+ DIP-40 Original
TXC-03452-BIPQ TRANSWIT 01+ QFP  

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