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MAX639 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX639 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 12 page ________________________________________________________________ Maxim Integrated Products 1 _______________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 volt- ages 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-compo- nent, 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. ________________________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 ____________________________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 ______________Ordering Information Ordering Information continued on last page. * Contact factory for dice specifications. 5V/3.3V/3V/Adjustable, High-Efficiency, Low IQ, Step-Down DC-DC Converters 19-4505; Rev 3; 8/97 PART TEMP. RANGE PIN-PACKAGE MAX639CPA 0°C to +70°C 8 Plastic DIP MAX639CSA 0°C to +70°C 8 SO MAX639C/D 0°C to +70°C Dice* 1 2 3 4 5 8 7 6 MAX639 MAX640 MAX653 DIP/SO TOP VIEW VFB SHDN V+ LX VOUT LBO LBI GND __________________Pin Configuration GND MAX639 SHDN LX VOUT LBO LOW-BATTERY DETECTOR OUTPUT ON/OFF LBI LOW-BATTERY DETECTOR INPUT OUTPUT 5V 225mA INPUT 5.5V TO 11.5V V+ VFB __________Typical Operating Circuit MAX639ESA -40°C to +85°C 8 SO MAX639EPA -40°C to +85°C 8 Plastic DIP MAX639MJA -55°C to +125°C 8 CERDIP EVALUATION KIT INFORMATION INCLUDED For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468. |
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