MAX20343

超低静态电流、低噪声、3.5W升/降压调节器

针对可穿戴生物识别检测和物联网优化功耗


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说明

MAX20343为超低静态电流、同相升/降压转换器,拥有1A @ 3.5V电流驱动能力,适用于要求长运行时间且需要高突发电流的应用。器件采用独有的控制算法,能够在降压、升/降压和升压模式之间平稳切换,最大程度降低输出电压纹波的不连续性和次谐波。1.9V低启动输入电压允许用户利用各种电源为器件供电,并且接近于零的最小工作电压使用户能够充分利用其能源的功效。MAX20343也是为最大程度降低电感和输出电容要求进行的设计,适合空间受限的应用。

MAX20343非常适合为光传感器应用供电,以及为低功率广域网(LPWAN)应用供电,这两种应用中的噪声必须保持最小,效率要求较高。例如,较小的轻载输出电压纹波允许光电容积脉搏波法(PPG)系统工作在较低LED电流,且没有干扰。此外,工作模式之间的平稳切换支持使用动态电压调节(DVS),以最大程度降低LED净空裕量,以及节省系统的功耗。对于有些应用,低功率密度电池必须经过超级电容缓冲,以提供较大LPWAN类型的突发电流,这时MAX20343的超低工作电压就允许用户可以利用超级电容储存的能量。较低的输出电感/电容要求支持较小的方案总尺寸。例如,在PPG系统中,如果主PCB电路板上的空间太拥挤,就能够灵活地将MAX20343安装在远端光模块上。

MAX20343支持带高度可配置I2C串行接口,或者单引脚支持的固定设置版本。器件工作在-40°C至+85°C温度范围,采用16焊球、1.77mm x 2.01mm、0.4mm焊距WLP封装,以及12引脚、2.50mm x 2.50mm、0.5mm焊距FC2QFN封装。

MAX20343: Typical Application Circuit MAX20343: Typical Application Circuit 放大+

关键特性

  • 延长系统运行时间
    • 3.5μA (典型值)超低静态电流
    • 250mW输出功率 @ 500mV输入电压
    • 动态电压调节(DVS)
  • 低、连续噪声特性
    • 避免工作电压范围不连续
    • 噪声敏感应用中无需后滤波LDO
  • 自适应负载瞬态响应
    • 可调节峰值电流,可以在各种应用中达到最佳性能
    • 快速负载瞬态响应最大程度降低建立时间
    • 可选反馈积分器
      • 3.5W输出功率时使能
      • 1.75W输出功率时关断以及快速负载瞬态建立时间
    • FAST引脚预触发负载响应并改进负载瞬态
  • 灵活的控制选项
    • I2C接口,带状态中断
    • EN和状态引脚、单电阻VOUT选择(RSEL)
  • -40°C至+85°C扩展级工作温度
  • 适合小型应用的最佳尺寸
    • 16焊球、1.77mm x 2.01mm、0.4mm焊距WLP封装,12引脚、2.50mm x 2.50mm、侧面防潮、0.5mm焊距、倒装芯片QFN封装
    • 电感/电容支持使用0603/0402尺寸

应用

  • 包含PPG的生物识别光检测
  • 工业传感器
  • IoT
  • LPWAN (LTE/NB-IoT, LTE/Cat-M1)

MAX20343EVKIT: MAX20343 评估套件

工具和模型

  • EE-Sim: MAX20343 设计和仿真
  • 型号   生产流程   工艺   样本量   不合格   FIT @ 25°C   FIT @ 55°C  

    备注: 通过技术手段对故障率进行汇总,并映射到相关的材料部件号。 故障率与被测件的数量密切相关。

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