MAX639

5V/3.3V/3V/可调、高效率、低IQ、降压型DC-DC转换器

在较宽负载范围内具有低电源电流、高转换效率


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说明

The MAX639/MAX640/MAX653 step-down switching regulators provide high efficiency over a wide range of load currents, delivering up to 225mA. A current-limiting pulse-frequency-modulated (PFM) control scheme gives the devices the benefits of pulse-width-modulated (PWM) converters (high efficiency at heavy loads), while using only 10µA of supply current (vs. 2mA to 10mA for PWM converters). The result is high efficiency over a wide range of loads.

The MAX639/MAX640/MAX653 input range is 4V to 11.5V, and the devices provide lower preset output voltages of 5V, 3.3V, and 3V, respectively. Or, the output can be user-adjusted to any voltage from 1.3V to the input voltage.

The MAX639/MAX640/MAX653 have an internal 1A power MOSFET switch, making them ideal for minimum-component, low- and medium-power applications. For increased output drive capability, use the MAX649/MAX651/MAX652 step-down controllers, which drive an external P-channel FET to deliver up to 5W.
MAX639、MAX640、MAX653:典型工作电路 MAX639、MAX640、MAX653:典型工作电路 放大+

关键特性

  • High Efficiency for a Wide Range of Load Currents
  • 10µA Quiescent Current
  • Output Currents Up to 225mA
  • Preset or Adjustable Output Voltage:
    • 5.0V (MAX639)
    • 3.3V (MAX640)
    • 3.0V (MAX653)
  • Low-Battery Detection Comparator
  • Current-Limiting PFM Control Scheme

应用

  • 5V至3.3V转换
  • 9V电池至5V、3.3V或3V转换
  • 替代高效线性稳压器
  • 便携式仪表与手持终端

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
申请可靠性报告: MAX639 
型号   生产流程   工艺   样本量   不合格   FIT @ 25°C   FIT @ 55°C   Material Composition  

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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