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MAX8855

MAX8855, MAX8855A

双路、5A、2MHz降压型调节器

尺寸最小、效率最高的5A调节器，内置开关，采用5mm x 5mm TQFN封装

数据资料
订阅

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概述

说明

MAX8855是一款高效、双路降压型稳压器，每路输出可提供5A电流。器件工作电压为2.35V至3.6V，输出电压为0.6V至0.9 x VIN，使得其可理想用于板载点负载应用。在整个负载、输入电压和温度变化范围内输出电压总误差低于±1%。

MAX8855采用PWM工作模式，开关频率可通过外部电阻设置为0.5MHz至2MHz范围。该器件还可同步至相同频率范围的外部时钟。两个内部开关型稳压器采用180°错相工作，以降低输入纹波电流，从而降低对输入电容的要求。高工作频率可使外部元件的尺寸最小。高效、内部双nMOS设计可在重载情况下保持电路板的温升较低。电压模式控制结构和高带宽(> 15MHz，典型值)电压误差放大器允许采用III型补偿方案来实现输入电压和负载瞬变情况下的快速响应，还允许使用陶瓷输出电容。

可编程软启动降低了输入浪涌电流。两个使能输入允许独立开启/关闭每路输出，可在系统级设计中提供极大的灵活性。提供基准输入以简化跟踪输出电压的应用。MAX8855提供32引脚薄型QFN (5mm x 5mm)封装，最大高度为0.8mm。
MAX8855：典型工作电路 MAX8855：典型工作电路 放大+

关键特性

  • 内置27mΩ导通电阻的MOSFET
  • 双路、5A、PWM降压型稳压器
  • 完善的过流、短路和过热保护
  • 在整个负载、输入电压和温度范围内，输出精度为±1%
  • 2.35V至3.6V工作电压
  • 一个通道上的REFIN用于跟踪或外部基准
  • 集成自举二极管
  • 0.6V至0.9 x VIN可调输出
  • 软启动降低电源浪涌电流
  • 0.5MHz至2MHz可调开关频率，或FSYNC输入
  • 全陶瓷电容设计
  • 180°错相工作降低输入纹波电流
  • 独立的使能输入和PWRGD输出
  • 提供5mm x 5mm薄型QFN封装
  • DDR应用中吸入/源出电流

应用

  • ASIC/CPU/DSP电源
  • DDR电源
  • 网络电源
  • 打印机电源
  • 机顶盒电源

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)		Design ToolsPackage/PinsBudgetary
Price
minmaxminmaxSee Notes
MAX8855 2.253.60.63.3Resistor5InternalYesYes22000EE-Sim
TQFN/32
$6.69 @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


MAX8855EVKIT: MAX8855评估板

技术资料

用户指南 5861 EE-SIM Design and Simulation Environment User Guide
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: MAX8855.pdf 
申请可靠性报告: MAX8855A 
无铅封装的锡（Sn）晶须报告

工具和模型

  • EE-Sim: MAX8855A 设计和仿真
  • EE-Sim: MAX8855 设计和仿真
  • MAX8855 SIMPLIS Schematic

    • CAD Symbols and Footprints

  • MAX8855AETJ+
  • MAX8855AETJ+T
  • MAX8855ETJ+
  • MAX8855ETJ+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 >
    环境管理体系 >

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    技术文档

    类型 编号 PDF 标题
    用户指南 5861 EE-SIM Design and Simulation Environment User Guide
    设计指南 5133 Power-Supply Solutions for Altera FPGAs
    设计指南 5132 Power-Supply Solutions for Xilinx FPGAs

    参考设计

    类型 编号 标题
    评估板7130MAX8855EVKIT MAX8855评估板