MAX764

19-0176; Rev 0; 6/94 K tion lua able a v E il Ava it -5V/-12V/-15V or Adjustable, High-Efficiency, Low IQ DC-DC Inverters ____________________________Features o High Efficiency for a Wide Range of Load Currents o 250mA Output Current o 120µA Max Supply Current o 5µA Max Shutdown Current o 3V to 16V Input Voltage Range o -5V (MAX764), -12V (MAX765), -15V (MAX766), or Adjustable Output from -1V to -16V o Current-Limited PFM Control Scheme o 300kHz Switching Frequency o Internal, P-Channel Power MOSFET _______________General Description The MAX764/MAX765/MAX766 inverting switching regulators are highly efficient over a wide range of load currents, delivering up to 1.5W. A unique, current-limited, pulse-frequency-modulated (PFM) control scheme combines the benefits of traditional PFM converters with the benefits of pulse-width-modulated (PWM) converters. Like PWM converters, the MAX764/MAX765/MAX766 are highly efficient at heavy loads. Yet because they are PFM devices, they use less than 120µA of supply current (vs. 2mA to 10mA for a PWM device). The input voltage range is 3V to 16V. The output voltage is preset at -5V (MAX764), -12V (MAX765), or -15V (MAX766); it can also be adjusted from -1V to -16V using two external resistors (Dual ModeTM). The maximum operating VIN - VOUT differential is 20V. These devices use miniature external components; their high switching frequencies (up to 300kHz) allow for less than 5mm diameter surface-mount magnetics. A standard 47µH inductor i...