MAX1972

双路、180°异相、1.4MHz、750mA、降压型调节器,带有POR和RSI/PFO

适用于GBIC、xDSL调制解调器和USB供电设备的更小尺寸、内置开关的双路降压转换器


点击查看特定型号的库存状况。

说明

MAX1970/MAX1971/MAX1972是双路输出电流型PWM buck转换器,工作于2.6V至5.5V的输入电压,达到每路至少750mA的输出电流。MAX1970和MAX1972工作于固定的1.4MHz (MAX1971工作于700kHz)频率,降低了输出电感和电容的尺寸和成本。稳压器180°错相开关工作也降低了输入电容的尺寸和成本。陶瓷电容可用于输入和输出。

通过外置反馈电阻,输出电压可以设定为1.2V至VIN;或将输出1预置为1.8V或3.3V, 输出2预置1.5V或2.5V。如果某路输出高于1.2V,则另一路输出可设定至1V以下的电压。考虑负载、线路和温度等变化的条件下,输出精确度仍优于±1%。内置软启动将降低启动时的浪涌电流。

这三种器件都有上电复位(/POR)的特性。MAX1971包括一个复位输入(RSI),强制/POR在RSI变低后继续保持175ms的低电平。MAX1970和MAX1972包括一个漏极开路的电源无效输出(PFO),用于监测输入电压,并在输入跌至3.94V以下时,输出高电平。对于USB供电的xDSL调制解调器,该输出可以用于检测USB电源无效。最小1.2MHz的开关频率保证工作在xDSL带宽以外。

有关PowerMind™的更多信息。
MAX1970、MAX1971、MAX1972:典型工作电路 MAX1970、MAX1971、MAX1972:典型工作电路 放大+

关键特性

  • 电流模式、1.4MHz固定频率PWM工作
  • 180°错相工作减小输入电容
  • 在整个负载、线路和温度变化范围内,达到了±1%输出精确度
  • 保证750mA输出电流
  • 2.6V至5.5V的输入电压
  • 上电复位延迟16.6ms (MAX1970)或175ms (MAX1972和MAX1972)
  • 电源失效输出(仅MAX1970和MAX1972)
  • 上电复位输入(仅MAX1971)
  • 工作在xDSL带外
  • 采用更小元件的超紧凑设计
  • 0.8V至VIN可调输出或1.8V/3.3V和1.5V/2.5V的预置输出
  • 全部采用陶瓷电容
  • 软启动减小浪涌电流

应用

  • 铜缆千兆位SFP和GBIC模块
  • 替代双LDO
  • USB供电设备
  • xDSL调制解调器
  • xDSL路由器
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
MAX1970 2.65.50.85
1.5
1.8
2.5
3.3
Preset
Resistor
0.75InternalYesYes21400
QSOP/16
$7.47 @1k
MAX1971 700
QSOP/16
$7.47 @1k
MAX1972 1400
QSOP/16
$3.74 @1k
查看所有Step-Down Switching Regulators (388)
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。


MAX1972EVKIT: MAX1970、MAX1971、MAX1972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

申请可靠性报告: MAX1972 
无铅封装的锡(Sn)晶须报告
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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