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SC1403

Part Number	SC1403
Manufacturer	Semtech Corporation
Description	Mobile Multi-Output PWM Controller with Virtual Current SenseTM
Published	Apr 8, 2005
Detailed Description	Mobile Multi-Output PWM Controller with Virtual Current SenseTM POWER MANAGEMENT Description The SC1403 is a multiple-ou...
Datasheet	SC1403 PDF File

Overview

Mobile Multi-Output PWM Controller with Virtual Current SenseTM POWER MANAGEMENT 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.
skipping mode for high efficiency at light load, or fixed frequency mode for low noise operation.
SC1403 PRELIMINARY 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 TM Virtual Current Sense 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 Applications Notebook and subnotebook computers Automotive electronics The SC1403 includes a PSAVE# input...

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