MAX1965

三/五路电源控制器,提供跟踪/排序功能

成本最低的三路/五路的调制解调器电源,具备跟踪和排序特性


点击查看特定型号的库存状况。

说明

MAX1964/MAX1965电源控制器设计面向于那些要求电压排序/跟踪功能、且成本敏感的应用,如线缆调制解调器用户端设备(CPE)、xDSL CPE和机顶盒。工作于低成本、非稳压的DC电源(比如交流适配器输出),MAX1964有三路正电源输出,MAX1965有4路正电源输出和一路负电源输出,提供了一组低成本的系统电源。

MAX1964包含一个电流型同步降压控制器和两个正电源稳压增益单元,而MAX1965还包括另一个正电源增益和一个负电源增益单元。主同步降压控制器产生大电流的3.3V预置输出或由外部电阻分压器设定、1.236V至0.75 x VIN的可调输出。200kHz的开关频率允许使用低成本的铝电解电容和功率电感。另外,MAX1964/MAX1965降压控制器通过检测低端MOSFET导通电阻上的压降,高效率地提供限流信号,省去了昂贵的检流电阻。

MAX1964/MAX1965以低成本产生其它电源。正稳压增益单元采用外部PNP调整管,直接从主降压转换器输出产生低电压电源(例如从3.3V主输出产生2.5V或1.8V电源),或从降压转换器的耦合绕组产生一些较高的电压电源(如5V、12V或15V)。MAX1965负增益单元采用外部的NPN调整管和一个耦合绕组,以产生-5V、-12V或-15V的电源。

所有输出电压都可以外部可调,提供了最大的灵活性。在启动过程中,MAX1964具有电源排序功能,而MAX1965具有电压跟踪的特性。两种控制器都提供一个电源就绪输出,以监测所有的输出电压。
MAX1964、MAX1965:典型工作电路 MAX1964、MAX1965:典型工作电路 放大+

关键特性

  • 4.5V至28V的输入电压范围
  • 主DC-DC降压转换器:
    • 预置3.3V或可调的输出电压(1.236V至0.75 x VIN)
    • 固定频率(200kHz) PWM控制器
    • 无需检流电阻
    • 可调限流
    • 95%效率
    • 软启
  • 两个(MAX1964)/四个(MAX1965)模拟增益单元:
    • 正电源模拟单元驱动低成本PNP调整管,构建正电源线性稳压器
    • 负电源模拟单元(MAX1965)驱动低成本NPN调整管,构建负电源线性稳压器
  • 电源就绪指示
  • 电压排序(MAX1964)或跟踪特性(MAX1965)

应用

  • 机顶盒
  • 无线本地环路(WLL)
  • xDSL、电缆和ISDN调制解调器
Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Preset VOUT
(V)
Output Adjust. MethodIOUT1
(A)
Switch TypeSynchronous SwitchingPower Good SignalDC-DC OutputsOper. Freq.
(kHz)
Package/PinsBudgetary
Price
minmaxminmaxSee Notes
MAX1964 4.5281.23203.3
Preset
Resistor
5ExternalYesYes1200
QSOP/16
$1.86 @1k
查看所有Step-Down Switching Regulators (389)
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。

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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