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 device...