MAX761

19-0201; Rev 0; 11/93 K tion lua able a v E il Ava it 12V/15V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Converters ____________________________Features o o o o o o o o o o High Efficiency for a Wide Range of Load Currents 12V/150mA Flash Memory Programming Supply 110µA Max Supply Current 5µA Max Shutdown Supply Current 2V to 16.5V Input Voltage Range 12V (MAX761), 15V (MAX762) or Adjustable Output Current-Limited PFM Control Scheme 300kHz Switching Frequency Internal, 1A, N-Channel Power FET LBI/LBO Low-Battery Comparator _______________General Description The MAX761/MAX762 step-up switching regulators provide high efficiency over a wide range of load currents, delivering up to 150mA. A unique, current-limited pulse-frequency-modulated (PFM) control scheme gives the devices the benefits of pulse-width-modulated (PWM) converters (high efficiency with heavy loads), while using less than 110µA of supply current (vs. 2mA to 10mA for PWM converters). The result is high efficiency over a wide range of loads. The MAX761/MAX762 input voltage range is 2V to 16.5V. Output voltages are preset to 12V (MAX761) and 15V (MAX762), or they can be set with two external resistors. With a 5V input, the MAX761 guarantees a 12V, 150mA output. Its high efficiency, low supply current, fast start-up time, SHDN controlling capability, and small size make the MAX761 ideal for powering flash memory. The MAX761/MAX762 have an internal 1A power MOSFET, making them ideal for minimum-compone...