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.

Features

♦ High Efficiency for a Wide Range of Load Currents

♦ 250mA Output Current

♦ 120µA Max Supply Current

♦ 5µA Max Shutdown Current

♦ 3V to 16V Input Voltage Range

♦ -5V (MAX764), -12V (MAX765), -15V (MAX766), or Adjustable Output from -1V to -16V

♦ Current-Limited PFM Control Scheme

♦ 300kHz Switching Frequency

♦ Internal, P-Channel Power MOSFET

Applications

  LCD-Bias Generators

  Portable Instruments

  LAN Adapters

  Remote Data-Acquisition Systems

  Battery-Powered Applications