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MAX652MJA Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX652MJA Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 16 page _______________General Description The MAX649/MAX651/MAX652 BiCMOS, step-down DC- DC switching controllers provide high efficiency over three decades of load current. A unique, current-limited pulse-frequency-modulated (PFM) control scheme gives these devices the benefits of pulse-width-modulation (PWM) converters (high efficiency at heavy loads), while using only 100µA of supply current (vs. 2mA to 10mA for PWM converters). The result is high efficiency over loads ranging from 10mA to more than 2.5A. These devices use miniature external components. Their high switching frequency (up to 300kHz) allows for less than 9mm diameter surface-mount inductors. The MAX649/MAX651/MAX652 have dropout voltages less than 1V and accept input voltages up to 16.5V. Output voltages are preset at 5V (MAX649), 3.3V (MAX651), and 3V (MAX652). These controllers can also be adjusted to any voltage from 1.5V to the input voltage by using two resistors. These step-down controllers drive external P-channel MOSFETs at loads greater than 10W. If less power is required, use the MAX639/MAX640/MAX653 step-down converters with on-chip FETs, which allow up to a 225mA load current. ________________________Applications 5V-to-3.3V Green PC Applications High-Efficiency Step-Down Regulation Minimum-Component DC-DC Converters Battery-Powered Applications ____________________________Features o More than 90% Efficiency (10mA to 1.5A Loads) o More than 12.5W Output Power o 100µA Max Quiescent Supply Current o 5µA Max Shutdown Supply Current o Less than 1.0V Dropout Voltage o 16.5V Max Input Voltage o 5V (MAX649), 3.3V (MAX651), 3V (MAX652), or Adjustable Output Voltage o Current-Limited Control Scheme o Up to 300kHz Switching Frequency ______________Ordering Information Ordering Information continued at end of data sheet. * Dice are tested at TA = +25°C. **Contact factory for availability and processing to MIL-STD-883. 5V/3.3V/3V or Adjustable, High-Efficiency, Low IQ, Step-Down DC-DC Controllers ________________________________________________________________ Maxim Integrated Products 1 1 2 3 4 8 7 6 5 GND EXT CS V+ REF SHDN FB OUT DIP/SO TOP VIEW MAX649 MAX651 MAX652 __________________Pin Configuration __________Typical Operating Circuit 19-0225; Rev 3; 9/97 PART TEMP. RANGE PIN-PACKAGE MAX649CPA 0°C to +70°C 8 Plastic DIP MAX649CSA 0°C to +70°C 8 SO MAX649C/D 0°C to +70°C Dice* MAX649EPA -40°C to +85°C 8 Plastic DIP MAX649ESA -40°C to +85°C 8 SO MAX649MJA -55°C to +125°C 8 CERDIP** MAX651 V+ CS SHDN FB GND ON/OFF P EXT REF OUT OUTPUT 3.3V INPUT 4V TO 16.5V EVALUATION KIT AVAILABLE For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. |
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