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MAX640

Part Number	MAX640
Manufacturer	Maxim
Description	5V/3.3V/3V/Adjustable / High-Efficiency / Low IQ / Step-Down DC-DC Converters
Published	May 2, 2005
Detailed Description	19-4505; Rev 3; 8/97 KIT ATION D EVALU CLUDE IN N IO T A M R O INF 5V/3.3V/3V/Adjustable, High-Efficiency, Low IQ, Ste...
Datasheet	MAX640 PDF File

Overview

19-4505; Rev 3; 8/97 KIT ATION D EVALU CLUDE IN N IO T A M R O INF 5V/3.
3V/3V/Adjustable, High-Efficiency, Low IQ, Step-Down DC-DC Converters ____________________________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 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.
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 ______________Ordering Information PART MAX639CPA MAX639CSA MAX639C/D MAX639EPA MAX639ESA MAX639MJA TEMP.
RANGE 0°C to +70°C 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C -55°C to +125°C PIN-PACKAGE 8 Plastic DIP 8 SO Dice* 8 Plastic DIP 8 SO 8 CERDIP ________________________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 Ordering Information continued on last page.
* Contact factory for dice specificati...

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