MAX1973

尺寸最小的1A、1.4MHz降压型稳压器


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说明

MAX1973/MAX1974是工作在1.4MHz固定频率的脉宽调制(PWM)、电流模式、降压型稳压器。输出电压通过外部分压电路调节至0.75V或预置为1V、1.5V (MAX1974)、1.8V或2.5V (MAX1973)。MAX1973还具有电压裕量特性可以使输出电压提高或降低4%,简化板级产品的测试。

1.4MHz的固定工作频率确保芯片工作在DSL频带之外,可提供快速瞬态响应、并且允许选用更小的外部元件。在1A应用中输入和输出端只需使用4.7µF的陶瓷电容。强制PWM操作模式保证开关频率在各种负载条件下保持恒定。

输出电压在整个负载、输入及工作温度范围内保持±1%精度。MAX1973具有电压裕量特性,MAX1974的电源就绪(POK)输出用于指示输出电压是否达到标称电压的90%。两者均采用微型10引脚µMAX®封装。

有关PowerMind™的更多信息。
MAX1973、MAX1974:典型工作电路 MAX1973、MAX1974:典型工作电路 放大+

关键特性

  • 0.19in²小尺寸
  • 1.8mm超低高度
  • 4.7µF陶瓷输入和输出电容
  • 2.6V至5.5V输入电压
  • 1A输出电流
  • 1%精度
  • 内置±4%的逻辑控制电压裕量(MAX1973)
  • 预置输出电压为1V、1.5V、1.8V、2.5V或可调(0.75V至VIN)
  • 固定频率PWM电流模式
  • 1.4MHz开关频率(DSL频带之外)
  • 100%占空比特性提供低压差
  • 小尺寸外部元件

应用

  • 蜂窝电话基站
  • 局端DSL和电信
  • DSL与无线调制解调器/路由器
  • DSP/ASIC核及I/O电源
  • 网络设备
  • 光模块
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
MAX1973 2.65.51.255
1.8
2.5
Preset
Resistor
0.95InternalYes-11400
UMAX/10
$3.07 @1k
MAX1974 0.75
1
1.5
Yes
UMAX/10
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。

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 1767 USB-Powered DSL Modem Supply

质量和环境数据

产品可靠性报告: MAX1973.pdf 
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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Package:
Temperature:

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