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| 型号： | SC1403ITSTRT |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A DUAL SWITCHING CONTROLLER, 380 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封装： | LEAD FREE, MO-153AE, TSSOP-28 |
| 文件页数： | 1/31页 |
| 文件大小： | 590K |
| 代理商： | SC1403ITSTRT |
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United States Patent No. 6,377,032
www.semtech.com
SC1403
Mobile Multi-Output PWM Controller
with Lossless Current Sense
POWER MANAGEMENT
Revision 5, April 2004
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 buck converter control
for two (3.3V and 5V) power supplies. An efficiency of
95% can be achieved for the two supplies. The SC1403
uses Semtech’s proprietary Virtual Current Sense
tech-
nology along with external error amplifier compensation
to achieve enhanced stability and DC accuracy over a
wide range of output filter components while maintain-
ing fixed frequency operation. Lossless current sensing
can be used to eliminate current sense resistors and
reduce cost. The SC1403 also provides a 5V linear regu-
lator for system housekeeping. The 5V linear regulator
is derived from the battery; for improved 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%. The internal oscillator
can be set to 200kHz, 300kHz, 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 skip-
ping mode for high efficiency at light load, or fixed fre-
quency mode for low noise operation.
3.3V and 5V dual synchronous outputs, resistor
programmable to 2.5V
Fixed frequency or PSAVE operation for maximum
efficiency over wide load range
5V / 50mA linear regulator
Virtual Current Sense for enhanced stability
Lossless current limiting
Out of phase switching reduces input capacitance
External compensation supports wide range of
output filter components
Programmable power-up sequence
Power Good output
Output overvoltage and overcurrent protection with
output undervoltage shutdown
6A typical shutdown current
6mW typical quiescent power
Notebook and subnotebook computers
Tablet PCs
Embedded applications
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| SC1531CSTR | 200mA & 250mA SmartLDOs |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SC1404 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:移动多输出PWM控制器用虚拟当前SenseTM |
| SC1404_05 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Mobile Multi-Output PWM Controller with Virtual Current SenseTM |
| SC1404ISSTR | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Mobile Multi-Output PWM Controller with Virtual Current SenseTM |
| SC1404ITSTR | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Mobile Multi-Output PWM Controller with Virtual Current SenseTM |
| SC1405 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:HIGH SPEED SYNCHRONOUS POWER MOSFET SMART DRIVER |
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