SC1404

www.DataSheet4U.com Mobile Multi-Output PWM Controller with Virtual Current SenseTM POWER MANAGEMENT Description The SC1404 is a multiple-output power supply controller designed to power battery operated systems. The SC1404 provides synchronous rectified buck converter control for two power supplies. An efficiency of 95% can be achieved. The SC1404 uses Semtech’s proprietary Virtual Current SenseTM technology along with external error amplifier compensation to achieve enhanced stability and DC accuracy over a wide range of output filter components while maintaining fixed frequency operation. The SC1404 also provides two linear regulators for system housekeeping. The 5V linear regulator takes its input from the battery; for efficiency, the output is switched to the 5V output when available. The 12V linear regulator output is generated from a coupled inductor off the 5V switching regulator. Control functions include: power up sequencing, soft start, powergood signaling, and frequency synchronization. Line and load regulation is to +/-1% of the output voltage. The internal oscillator can be adjusted to 200 kHz or 300 kHz or synchronized to an external clock. The MOSFET drivers provide >1A peak drive current for fast MOSFET switching. The SC1404 includes a PSAVE# input to select pulse skipping mode for high efficiency at light load, or fixed frequency mode for low noise operation. SC1404 Features 6 to 30V input range (operation possible below 6V) 3.3V and 5V dual synchronous o...