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MAX8505

MAX8505

3A、1MHz、1%精度、内置开关的降压型调节器，带有电源就绪指示

数据资料
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概述

说明

MAX8505降压型调节器工作在2.6V至5.5V输入电压范围内，产生0.8V至0.85 x VIN的可调输出电压，电流可达3A。在外加2.6V至5.5V的偏置电源时，输入电压最低可达2.25V。

MAX8505集成了功率MOSFET，工作于1MHz/500kHz开关频率，以提供紧凑的设计。电流模式脉宽调制(PWM)控制功能简化了采用陶瓷电容或聚合物输出电容的补偿，并提供极好的瞬态响应。

MAX8505在整个负载、输入电源和温度范围内具有1%的精确输出。通过外部电容实现可调的软启动功能。在软启动期间，电压调节回路工作。当有源器件，如微处理器或是ASIC连接到MAX8505的输出，一旦超过其低压门限时将产生一个突变的负载电流，上述控制方式将限制电压的跌落。

MAX8505具有限流保护、短路保护和热过载保护功能，使设计更为可靠。漏极开路电源就绪(POK)监视输出电压。

有关PowerMind™的更多信息。
MAX8505：典型工作电路 MAX8505：典型工作电路 放大+

关键特性

  • 节省空间—4.9mm x 6mm占位面积, 1µH电感, 47µF陶瓷输出电容
  • 输入电压范围
    • 2.6V至5.5V
    • 由偏置电源供电时可降至2.25V
  • 0.8V至0.85 x VIN，3A输出电流
  • 陶瓷电容或聚合体电容
  • 在整个负载、输入电源和温度范围内具有±1%的精确输出
  • 快速瞬态响应
  • 可调的软启动
  • 上电过程中的电压调节软启动限制了输出电压跌落
  • POK监视输出电压

应用

  • µP/ASIC/DSP/FPGA核与I/O电源
  • 芯片组供电
  • 网络与电信设备
  • 服务器、RAID和存储系统

参数规格

Part NumberVIN
(V)		VIN
(V)		VOUT1
(V)		VOUT1
(V)		Output Adjust. MethodIOUT1
(A)		Switch TypeSynchronous SwitchingPower Good SignalDC-DC OutputsOper. Freq.
(kHz)		Package/PinsBudgetary
Price
minmaxminmaxSee Notes
MAX8505 2.65.50.84.5Resistor3InternalYesYes11000
QSOP/16
$3.11 @1k
查看所有Step-Down Switching Regulators (367)
Pricing Notes:
价格仅供参考，用于同类产品的比较。所提供报价为美元，需要依汇率折合成人民币。该价格将因当地关税、税率和汇率而异。有关特定订购量和指定版本的报价和供货问题，请参考：价格与供货网站或与指定代理商联系。

设计资源


MAX8505EVKIT: MAX8505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
应用笔记 3560 高效DC-DC转换器，占用面积等同于LDO
参考原理图 3430 提供三路、±5%稳定输出的高效PoE (以太网供电)电源

质量和环境数据

产品可靠性报告: MAX8505.pdf 
无铅封装的锡（Sn）晶须报告

CAD Symbols and Footprints

  • MAX8505EEE
  • MAX8505EEE+
  • MAX8505EEE+T
  • MAX8505EEE-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。

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    技术文档

    参考设计

    类型 编号 标题
    参考电路3430提供三路、±5%稳定输出的高效PoE (以太网供电)电源
    评估板4150MAX8505EVKIT MAX8505评估板