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 is ideal for most applications， so no magnetics design is necessary. An internal power MOSFET makes the MAX764/MAX765/ MAX766 ideal for minimum component count， low- and medium-power applications. For increased output drive capability or higher output voltages， use the MAX774/MAX775/MAX776 or MAX1774， which drive an external power P-channel MOSFET for loads up to 5W