DESCRIPTION
An efficiency of 95% can be achieved. 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 outputs Fixed-frequency or PSAVE for maximum efficien...
Semtech Corporation
