SC1403ITSTRT datasheet(1/31 Pages) SEMTECH

部品番号	SC1403ITSTRT

部品情報	Mobile Multi-Output PWM Controller with Lossless Current Sense

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メーカー	SEMTECH [Semtech Corporation]

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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

6µA typical shutdown current

6mW typical quiescent power

Notebook and subnotebook computers

Tablet PCs

Embedded applications

同様の部品番号 - SC1403ITSTRT

メーカー	部品番号	データシート	部品情報
Semtech Corporation	SC1403ITSTR	567Kb / 30P	Mobile Multi-Output PWM Controller with Virtual Current SenseTM

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同様の説明 - SC1403ITSTRT

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Semtech Corporation	SC1403	567Kb / 30P	Mobile Multi-Output PWM Controller with Virtual Current SenseTM
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Fairchild Semiconductor	FAN5236	234Kb / 20P	Dual Mobile-Friendly DDR / Dual-output PWM Controller
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Fairchild Semiconductor	FAN5236	501Kb / 19P	Dual Mobile-Friendly DDR / Dual-Output PWM Controller
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