MAX640CSA

5V / 3.3V / 3V /可调，高效率，低IQ ，降压型DC- DC转换器 5V/3.3V/3V/Adjustable, High-Efficiency, Low IQ, Step-Down DC-DC Converters

General Description

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.

Features

♦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

Applications

9V Battery to 5V, 3.3V, or 3V Conversion

High-Efficiency Linear Regulator Replacement

Portable Instruments and Handy-Terminals

5V-to-3.3V Converters