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Part Number: SC1403
Description: The SC1403 is a multiple-output power supply controller designed to power battery operated systems. Th...
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SC1403
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General Description
SC1403 General Description
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 efficiency 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 accuracy over a wide range of output filter components while maintaining fixed frequency operation. The SC1403 also provides a linear regulator for system housekeeping. 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 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 SC1403 includes a PSAVE# input to select pulse skipping mode for high efficiency at light load, or fixed frequency mode for low noise operation.
SC1403 Maximum Ratings
| Parameter |
Symbol |
Maximum |
Units |
| Supply Voltage, V+ to GND |
VIN |
-0.3 to +30 |
V |
| Boost Voltages, BST3, BST5, to GND |
-0.3 to +36 |
V | |
| PGND to GND |
± 0.3 |
V | |
| BST3 to PHASE3; BST5 to PHASE5; CSL5, CSH5 to GND; CSL3, CSH3 to GND |
-0.3 to +6 DC -2.0 to +7 Transient , 100nS |
V | |
| REF, SYNC, SEQ, PSAVE#, ON5, RESET#, VL, FB3, FB5, COMP3, COMP5 to GND |
-0.3V to +6 |
V | |
| ON3, SHDN# to GND |
-0.3V to (V+ + 0.3V) |
V | |
| VL, REF Short to GND |
Continuous |
||
| REF Current |
+5 |
mA | |
| VL Current |
+50 |
mA | |
| Lead Temperature (Soldering) 10 seconds |
TLEAD |
+300 |
|
| Storage Temperature Range |
TSTG |
-65 to +200 |
|
| Junction Temperature Range |
TJ |
+150 |
SC1403 Features
·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
·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
SC1403 Typical Application
·Notebook and subnotebook computers
·Automotive electronics
·Desktop DC-DC converters
·Automotive electronics
·Desktop DC-DC converters
SC1403 Connection Diagram
SC1403
PDF/DataSheet Download
- Datasheet: SC1403
- File Size: 582517 KB
- Manufacturer: SEMTECH [Semtech Corporation]
- Click here to Download
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