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MAX8643

MAX8643

3A、2MHz、降压型调节器，内置开关

尺寸最小、效率最高的3A降压型调节器，工作频率高达2.4MHz

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概述

说明

MAX8643是一款高效开关稳压器，在0.6V至(0.9 × VIN)输出范围内可提供最大3A负载电流。器件工作电压为2.35V至3.6V，非常适合负载点(point-of-load)和后稳压应用。在整个负载、输入电压和温度变化范围内，器件输出电压误差低于±1%。

MAX8643采用固定频率PWM工作模式，开关频率可通过外部电阻在500kHz至2MHz范围内设置。高工作频率允许全陶瓷电容设计，同时也允许采用小尺寸外部元件。

片内低导通电阻nMOS保证在较重负载下提供高效率，并使电感值最小。相对于分立元件解决方案，该器件的布局要简单得多。便利的电路布局和引脚配置保证器件在新设计应用中的一次通过率。

MAX8643内部集成了宽带(> 14MHz)电压误差放大器。电压模式控制结构和误差放大器允许使用III型补偿方案，使环路带宽达到开关频率的20%。较宽的环路频带能够保证快速瞬态响应，只需较小的输出电容，允许全陶瓷电容设计。

MAX8643提供两个三态逻辑输入，用于选择9种不同的输出电压。这些预设的输出电压为客户提供±1%的输出电压精度，无需使用昂贵的±0.1%精密电阻。另外，通过在反馈端使用两个外部电阻(内部0.6V基准)或在REFIN输入端施加外部基准电压，可以将输出电压设置在任何用户需要的数值。MAX8643利用外部电容编程软启动时间，以减少输入浪涌电流。MAX8643采用24引脚、4mm x 4mm薄型QFN无铅封装。

关于选择合适的电容、电阻和电感方面的指南，请使用我们的在线元件选型表格。
MAX8643：典型工作电路 MAX8643：典型工作电路 放大+

关键特性

  • 内置37mΩ RDS(ON) MOSFET
  • 3A连续电流输出
  • 在整个负载、输入电压和温度范围内提供±1%的输出精度
  • 2.35V至3.6V工作电压
  • 输出电压在0.6V至(0.9 × VIN)之间可调
  • 软启动抑制输入浪涌电流
  • 500kHz至2MHz可调开关频率
  • 能够使用陶瓷、聚合物以及电解输出电容
  • VID选择输出电压
    • 0.6、0.7、0.8、1.0、1.2、1.5、1.8、2.0和2.5V
  • 完整的过压和过热保护
  • DDR应用中吸入/源出电流
  • 24引脚、4mm x 4mm薄型QFN无铅封装

应用

  • ASIC/CPU/DSP核与I/O供电
  • 基站电源
  • DDR电源
  • POL
  • RAID控制电源
  • 电信与网络电源

设计资源


MAX8643EVKIT: MAX8643评估板

技术资料

设计指南 5133 Power-Supply Solutions for Altera FPGAs
设计指南 5132 Power-Supply Solutions for Xilinx FPGAs

质量和环境数据

产品可靠性报告: MAX8643.pdf 
无铅封装的锡（Sn）晶须报告

CAD Symbols and Footprints

  • MAX8643AETG+
  • MAX8643AETG+T
  • MAX8643AETG/V+
  • MAX8643AETG/V+T
  • MAX8643ETG+
  • MAX8643ETG+T
    •

    质量与环境

    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。

    质量管理体系 >
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    参考设计

    类型 编号 标题
    评估板5332MAX8643EVKIT MAX8643评估板