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參數資料
| 型號： | SC1403 |
| 廠商： | Semtech Corporation |
| 英文描述： | Mobile Multi-Output PWM Controller with Virtual Current SenseTM |
| 中文描述： | 移動多輸出PWM控制器虛擬電流SenseTM |
| 文件頁數： | 1/30頁 |
| 文件大?。?/td> | 567K |
| 代理商： | SC1403 |
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www.semtech.com
SC1403
Mobile Multi-Output PWM Controller
with Virtual Current Sense
TM
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 effi-
ciency of 95% can be achieved for the two supplies. The
SC1403 uses Semtech’s proprietary Virtual Current
Sense
TM
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.
PRELIMINARY
Revision 3, August 2002
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
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
Desktop DC-DC converters
Typical Application Circuit
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.
TM
for enhanced stability
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
相關PDF資料 |
PDF描述 |
|---|---|
| SC1403ITSTR | Mobile Multi-Output PWM Controller with Virtual Current SenseTM |
| SC1404_05 | Differential Input, Dual, Simultaneous Sampling, 4.25 MSPS, 14-Bit, SAR ADC, 16-TSSOP, Ind Temp |
| SC1404 | Mobile Multi-Output PWM Controller with Virtual Current Sense |
| SC1404ISSTR | Mobile Multi-Output PWM Controller with Virtual Current Sense |
| SC1404ITSTR | Mobile Multi-Output PWM Controller with Virtual Current Sense |
相關代理商/技術參數 |
參數描述 |
|---|---|
| SC1403_04 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Mobile Multi-Output PWM Controller with Lossless Current Sense |
| SC1403ITSTR | 制造商:Semtech Corporation 功能描述:IC, MULTI-OUTPUT PWM CONTROLLER, 28-TSSOP, Primary Input Voltage:15V, No. of Out |
| SC1403ITSTRT | 制造商:Semtech Corporation 功能描述:DC DC Cntrlr Triple-OUT PWM DC to DC Controller/Step Down 6V to 30V Input 28-Pin TSSOP T/R |
| SC1404 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:移動多輸出PWM控制器用虛擬當前SenseTM |
| SC1404_05 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Mobile Multi-Output PWM Controller with Virtual Current SenseTM |
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