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SC1403 Datasheet(PDF) 1 Page - Semtech Corporation |
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SC1403 Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 30 page  1 www.semtech.com SC1403 Mobile Multi-Output PWM Controller with Virtual Current SenseTM POWER MANAGEMENT PRELIMINARY Revision 3, August 2002 Description Features Applications Typical Application Circuit The SC1403 is a multiple-output power supply controller designed to power battery operated systems. The SC1403 provides synchronous rectified buck converter control for two (3.3 V and 5 V) power supplies. An effi- ciency of 95% can be achieved for the two supplies. The SC1403 uses Semtech’s proprietary Virtual Current SenseTM technology along with external error amplifier compensation to achieve enhanced stability and DC ac- curacy over a wide range of output filter components while maintaining fixed frequency operation. The SC1403 also provides a linear regulator for system housekeep- ing. The 5 V linear regulator takes its input from the battery; for efficiency, the output is switched to the 5V output when available. Control functions include: power up sequencing, soft start, power-good signaling, and frequency synchroniza- tion. 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 SC1403 includes a PSAVE# input to select pulse skipping mode for high efficiency at light load, or fixed frequency mode for low noise operation. 3.3V and 5V dual synchronous outputs, resistor programmable to 2.5V Fixed frequency or PSAVE for maximum efficiency over wide load current range 5V / 50mA linear regulator Virtual Current Sense TM for enhanced stability Accurate low loss current limiting Out of phase switching reduces input capacitance requirements External compensation supports wide range of output filter components Programmable power-up sequence Power good output Output overvoltage & overcurrent protection with output undervoltage shutdown 4µA typical shutdown current 6mW typical quiescent power Notebook and subnotebook computers Automotive electronics Desktop DC-DC converters 4 5 L2 L1 COMP3 BST3 DH3 PHASE3 DL3 CSH3 CSL3 FB3 ON3 ON5 PSAV# GND RST# REF SEQ FB5 CSL5 CSH5 PGND DL5 PHASE5 DH5 BST5 COMP5 SYNC V+ SHDN# VL |
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