SS6580L

SS6580/L Step-Down DC/DC Controller with Shutdown n l l l l FEATURES Operating Voltage up to 15V. Simple Voltage-Mode PWM Control. Fast Transient Response. 2V and 1.3V ± 2% Feedback Voltage Reference Options. Adjustable Current Limit without External Sense Resistors. 200 KHz Switching Oscillator. Short-Circuit Protection with Low Short-Circuit Output Current. Low Shutdown Current Built-in Soft Start. n DESCRIPTION The SS6580 is a high-power, high-efficiency voltage-mode switching regulator controller for motherboard VI/O power supply applications. Designed to drive an N-channel MOSFET in a standard buck topology, the SS6580 features a high voltage CMOS output driver with short-circuit protection in an 8-pin package. An external 4-bit Digital-to-Analog Converter (DAC) can be used along with the SS6580 to adjust the output voltage from 2.0V to 3.5V in 0.1V increments. Table 1 on the following page specifies the corresponding output voltage for 16 combinations of DAC inputs as shown in the typical application circuit. The 200 KHz switching frequency allows the use of small external components while maintaining high conversion efficiency. The 11MHz bandwidth and the 6V/µS slew rate of the error amplifier ensure high converter bandwidth and fast transient response. The SS6580 provides both adjustable l l l l l n l l l l APPLICATIONS Power Supply for Motherboard VGTL (1.5V Output) Power Supply for Motherboard VI/O. High-Power 5V to 3.xV DC/DC Regulators. Low-Voltage Distri...