MAX640 Datasheet Step-Down DC-DC Converters

Manufacturer: Maxim Integrated (now Analog Devices)

Overview: 19-4505; Rev 3; 8/97 KIT ATION D EVALU CLUDE IN N IO T A M R O INF 5V/3.

MAX640 step-down dc-dc converters by Maxim Integrated (now Analog Devices) - Datasheet Preview

Datasheet Details

Part number	MAX640
Manufacturer	Maxim Integrated (now Analog Devices)
File Size	755.54 KB
Description	Step-Down DC-DC Converters
Download	MAX640 Download (PDF)

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).

Key Features

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

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