MAX639 - 5V/3.3V/3V/可调、高效率、低IQ、降压型DC-DC转换器

MAX639是Maxim美信半导体公司的一款DC-DC开关调节器产品，MAX639是5V/3.3V/3V/可调、高效率、低IQ、降压型DC-DC转换器，本站介绍了MAX639的封装应用图解、特点和优点、功能等，并给出了与MAX639相关的Maxim元器件型号供参考。

MAX639 - 5V/3.3V/3V/可调、高效率、低IQ、降压型DC-DC转换器 - DC-DC开关调节器 - 在较宽负载范围内具有低电源电流、高转换效率 - 美信半导体

产品概述

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.

关键特性

以下关键特性由Maxim美信半导体提供：

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

热门应用

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

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