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MAX772 Dataheets PDF



Part Number MAX772
Manufacturers Maxim
Logo Maxim
Description 5V/12V/15V or Adjustable / High-Efficiency / Low IQ / Step-Up DC-DC Controllers
Datasheet MAX772 DatasheetMAX772 Datasheet (PDF)

19-0202; Rev 2; 11/96 L MANUA ION KIT HEET T A U L EVA TA S WS DA FOLLO 5V/12V/15V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controllers ____________________________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.

  MAX772   MAX772


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19-0202; Rev 2; 11/96 L MANUA ION KIT HEET T A U L EVA TA S WS DA FOLLO 5V/12V/15V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controllers ____________________________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 _______________General Description The MAX770–MAX773 step-up switching controllers provide 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 surfacemount 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 output 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 onboard MOSFETs. MAX770–MAX773 ______________Ordering Information PART MAX770CPA MAX770CSA MAX770C/D MAX770EPA MAX770ESA MAX770MJA 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 Plastic DIP 8 SO Dice* 8 Plastic DIP 8 SO 8 CERDIP** ________________________Applications Palmtops/Handy-Terminals High-Efficiency DC-DC Converters Battery-Powered Applications Positive LCD-Bias Generators Portable Communicators Flash Memory Programmers Ordering Information continued at end of data sheet. *Contact factory for dice specifications. **Contact factory for availability and processing to MIL-STD-883B. _________________Pin Configurations __________Typical Operating Circuit INPUT 2V TO VOUT OUTPUT 12V EXT V+ 1 2 8 CS GND AGND REF 7 6 5 TOP VIEW MAX771 ON/OFF SHDN EXT CS N FB 3 SHDN 4 MAX770 MAX771 MAX772 DIP/SO REF FB AGND GND V+ Pin Configurations continued at end of data sheet. ________________________________________________________________ Maxim Integrated Products 1 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. 5V/12V/15V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controllers MAX770–MAX773 ABSOLUTE MAXIMUM RATINGS Supply Voltages V+ to GND.............................................................-0.3V to 17V V+ to SGND.............................................................-0.3V to 7V SGND........................................................-0.3V to (V+ + 0.3V) EXT, CS, REF, LBO, LBI, SHDN, FB.............-0.3V to (V+ + 0.3V) EXTH, EXTL ..................................................-0.3V to (V+ + 0.3V) V5, V12, V15 .............................................................-0.3V to 17V GND to AGND .........................................................0.1V to -0.1V ISGND ..................................................................................50mA Continuous Power Dissipation (TA = +70°C) 8-Pin Plastic DIP (derate 9.09mW/°C above +70°C)....727mW 8-Pin SO (derate 5.88mW/°C above +70°C) ................471mW 8-Pin CERDIP (derate 8.00mW/°C above +70°C) ........640mW 14-Pin Plastic DIP (derate 10.00mW/°C above +70°C) .............................800mW 14-Pin SO (derate 8.33mW/°C above +70°C) ..............667mW 14-Pin CERDIP (derate 9.09mW/°C above +70°C) ......727mW Operating Temperature Ranges MAX77_C_ _ ........................................................0°C to +70°C MAX77_E_ _......................................................-40°C to +85°C MAX77_MJ_ ...................................................-55°C to +125°C Junction Temperatures MAX77_C_ _/E_ _ ..........................................................+150°C MAX77_MJ_..................................................................+175°C Storage Temperature Range .............................-65°C to +160°C Lead Temperature (soldering, 10sec) .............................+300°C Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these o.


MAX771 MAX772 MAX773


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