DESCRIPTION

The SPX1580 is a 7A Low Dropout Regulator with extremely low dropout voltage. The adjustable version requires only two external resistors to set the output voltage. The fixed version has a preset output of 3.3V or 2.5V and does not require any external resistors. The SPX1580 features a low dropout of 540mV(Typ.) and offers fast transient response. This device is suitable for Pentium applications requiring 2.5V from 3.3V ATX power supplies, where a low current input voltage 1V greater than the output voltage is available. With an external sense pin the load regulation is less than 1mV. This device is an excellent choice for the use of powering low voltage microprocessors that require a lower dropout, fast transient response to regulate from 3.3V and 5V supplies. The SPX1580 is also an excellent choice as a post regulator for switching supplies applications.

FEATURES

■ Low Dropout Voltage 540mV at 7A Full Load Current

■ Adjustable Ouput Down to 1.25V from ATX Power Supply

■ Fixed Output Voltages of 3.3V and 2.5V

■ Extremely Tight Load and Line Regulation

■ Standard 5-Terminal Low Cost TO-220 and TO-263

■ Replacement to Industry Standard LT1580

APPLICATIONS

■ 3.3V ATX Power Supplies

■ 3.3V to 2.9V for Portable PENTIUMTM Processor

■ 5V to 3.5V VRE Supply

■ High efficiency Green Computer Systems