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MAX773CPD Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX773CPD Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 20 page _______________General Description The MAX770–MAX773 step-up switching controllers pro- vide 90% efficiency over a 10mA to 1A load. A unique current-limited pulse-frequency-modulation (PFM) control scheme gives these devices the benefits of pulse-width-modulation (PWM) converters (high efficiency at heavy loads), while using less than 110µA of supply current (vs. 2mA to 10mA for PWM converters). These ICs use tiny external components. Their high switching frequencies (up to 300kHz) allow surface- mount magnetics of 5mm height and 9mm diameter. The MAX770/MAX771/MAX772 accept input voltages from 2V to 16.5V. Output voltages are preset at 5V, (MAX770), 12V (MAX771), and 15V (MAX772); they can also be adjusted using two resistors. The MAX773 accepts inputs from 3V to 16.5V. For a wider input range, it features an internal shunt regulator that allows unlimited higher input voltages. The MAX773’s out- put can be set to 5V, 12V, or 15V, or it can be adjusted with two resistors. The MAX770–MAX773 drive external N-channel MOSFET switches, allowing them to power loads up to 15W. If less power is required, use the MAX756/MAX757 or MAX761/MAX762 step-up switching regulators with on- board MOSFETs. ________________________Applications Palmtops/Handy-Terminals High-Efficiency DC-DC Converters Battery-Powered Applications Positive LCD-Bias Generators Portable Communicators Flash Memory Programmers ____________________________Features o 90% Efficiency for 10mA to 1A Load Currents o Up to 15W Output Power o 110µA Max Supply Current o 5µA Max Shutdown Current o 2V to 16.5V Input Range (MAX770/MAX771/MAX772) o Internal Shunt Regulator for High Input Voltages (MAX773) o Preset or Adjustable Output Voltages MAX770: 5V or Adjustable MAX771: 12V or Adjustable MAX772: 15V or Adjustable MAX773: 5V, 12V, 15V, or Adjustable o Current-Limited PFM Control Scheme o 300kHz Switching Frequency ______________Ordering Information Ordering Information continued at end of data sheet. *Contact factory for dice specifications. **Contact factory for availability and processing to MIL-STD-883B. 5V/12V/15V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controllers ________________________________________________________________ Maxim Integrated Products 1 1 2 3 4 8 7 6 5 CS GND AGND REF SHDN FB V+ EXT MAX770 MAX771 MAX772 DIP/SO _________________Pin Configurations FB AGND GND V+ CS EXT N REF SHDN ON/OFF OUTPUT 12V INPUT 2V TO VOUT MAX771 __________Typical Operating Circuit PART TEMP. RANGE PIN-PACKAGE MAX770CPA 0°C to +70°C Plastic DIP MAX770CSA 0°C to +70°C 8 SO MAX770C/D 0°C to +70°C Dice* MAX770EPA -40°C to +85°C 8 Plastic DIP MAX770ESA -40°C to +85°C 8 SO MAX770MJA -55°C to +125°C 8 CERDIP** TOP VIEW Pin Configurations continued at end of data sheet. 19-0202; Rev 2; 11/96 EVALUATION KIT MANUAL FOLLOWS DATA SHEET 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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