Conv DC-DC Single Step Down 4V to 11.5V 8-Pin SOIC N

The MAX640 step-down switching regulators provide high efficiency over a wide range of load currents, delivering up to 225mA. A current-limiting pulse-frequency-modulated (PFM) control scheme gives the devices the benefits of pulse-width-modulated (PWM) converters (high efficiency at heavy loads), while using only 10µA of supply current (vs. 2mA to 10mA for PWM converters). The result is high efficiency over a wide range of loads. The MAX640 input range is 4V to 11.5V, and the devices provide lower preset output voltages of 5V, 3.3V, and 3V, respectively. Or, the output can be user-adjusted to any voltage from 1.3V to the input voltage. The MAX640 have an internal 1A power MOSFET switch, making them ideal for minimum-component, low- and medium-power applications. For increased output drive capability, use the MAX649/MAX651/MAX652 step-down controllers, which drive an external P-channel FET to deliver up to 5W.

• High Efficiency for a Wide Range of Load Currents
• 10µA Quiescent Current
• Output Currents Up to 225mA
• Preset or Adjustable Output Voltage: 3.3V
• Low-Battery Detection Comparator
• Current-Limiting PFM Control Scheme