MAX8686

单相/多相、降压型、DC-DC转换器,每相可提供高达25A的电流

可编程相屏蔽功能大大提高负载降低条件下的效率


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说明

MAX8686电流模式同步整流PWM降压调节器内置MOSFET,工作电压范围:4.5V至20V,可产生0.7V至5.5V可调输出电压,每相可提供高达25A的电流。

MAX8686采用峰值电流检测模式,开关频率调节范围为300kHz至1MHz。可调限流门限允许针对具体应用的负载电流进行优化。可通过外部检流电阻限制电感电流或利用电感进行无损电流检测。折返式限流和打嗝式限流可降低过载或短路情况下的功耗,故障排除后可自动恢复工作。

MAX8686即使在输出存在预偏置电压时也能够实现单调启动。此外,还提供可调节的软启动,实现受控开启过程。MAX8686内置精度为1%的基准,所提供基准输入用于支持更高精度的外部基准,实现电压追踪设计(如DDR存储器供电)。

MAX8686可以将8路输出并联使用,实现真正的多相模式,以提供高达200A的输出电流。此工作模式下,满载时器件各相的电流均衡度达到10%。轻载时,MAX8686支持可编程换相操作,提高系统效率。

MAX8686的其它功能包括使能输入和用于电源排序的电源就绪(POK)指示。MAX8686还具有过压闭锁保护,可在输出电压大于额定电压的120%时开启低边MOSFET。MAX8686提供增强散热的40引脚、6mm x 6mm TQFN封装。

MAX8686:典型工作电路 MAX8686:典型工作电路 放大+

关键特性

  • 工作电压范围4.5V至20V
  • 基准电压在整个温度范围内的精度为1%
  • 基准输入(REFIN)用于输出跟踪或系统基准电压
  • 开关频率300kHz至1MHz可调
  • 内置MOSFET,单相/多相工作模式可提供高达25A/200A电流
  • 可调节限流
  • 输出电压单调启动(预偏置)
  • 输出可源出、吸入电流
  • 可调节软启动
  • 热过载保护
  • 输出过压保护
  • 增强散热的40引脚、6mm x 6mm TQFN封装(4W)

应用

  • DDR存储器
  • 模块替代产品
  • 网络设备
  • POL电源
  • 服务器
  • 电信设备
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
MAX8686 4.5200.75.5Resistor25InternalYesYes11000
TQFN HYBRID/40
$6.84 @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。


MAX8686EVKIT: MAX8686评估板

CAD Symbols and Footprints

  • MAX8686ETL+
  • MAX8686ETL+T
  • 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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