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
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.
