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SC1404ITSTR Datasheet(PDF) 1 Page - Semtech Corporation |
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SC1404ITSTR Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 27 page  1 www.semtech.com SC1404 Mobile Multi-Output PWM Controller with Virtual Current SenseTM POWER MANAGEMENT Description Features Applications Typical Application Circuit The SC1404 is a multiple-output power supply controller designed to power battery operated systems. The SC1404 provides syn- chronous 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 compo- nents 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, power- good signaling, and frequency synchronization. Line and load regulation is to +/-1% of the output voltage. The internal oscilla- tor can be adjusted to 200 kHz or 300 kHz or synchronized to an external clock. The MOSFET drivers provide >1A peak drive cur- rent 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. 6 to 30V input range (operation possible below 6V) 3.3V and 5V dual synchronous outputs Fixed-frequency or PSAVE for maximum efficiency over wide load current range 5V/50mA linear regulator 12V/200mA linear regulator Virtual Current Sense TM for enhanced stability Accurate low-loss current limiting Out-of-phase switching reduces input capacitance External compensation supports wide range of output filter components for reduced cost 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 Revision 4, July 2003 U4 SC1404 CSH3 1 CSL3 2 COMP3 3 12OUT 4 VDD 5 ON5 7 REF 9 RESET 11 COMP5 12 CSL5 13 CSH5 14 SEQ 15 DH5 16 PHASE5 17 BST5 18 DL5 19 PGND 20 V+ 22 SHDN 23 DL3 24 BST3 25 PHASE3 26 DH3 27 RUN/ON3 28 L1 + 4.7uF 10 + + T1 0.1uF C7 0.1uF 0.1uF 0.1uF 3 V O N /O F F S C 1404 O N /O F F INP UT + 6 V to + 3 0 V + 0.1uF 5 V O N /O F F + 2 .5 V RE F P O W E R GOOD +3 V O U T P U T + 5 V AL W A YS O N + 4.7uF + 2.2uF + 12V O U TP U T +5 V O U T P U T S C 1404 O N /O F F C11 0.22uF 0.1uF |
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