SC1404 datasheet(1/25 Pages) SEMTECH

номер детали	SC1404

подробное описание детали	Mobile Multi-Output PWM Controller with Virtual Current SenseTM

PDF	25 Pages

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производитель	SEMTECH [Semtech Corporation]

домашняя страница	http://www.semtech.com

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SC1404

Mobile Multi-Output PWM Controller

with Virtual Current SenseTM

POWER MANAGEMENT

Description

Features

Applications

Typical Application Circuit

The SC1404 is a multiple-output power supply controller designed

for battery operated systems. The SC1404 provides synchronous

rectified buck converter control for two power supplies. An effi-

ciency of 95% can be achieved. The SC1404 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 SC1404 also pro-

vides two linear regulators for system housekeeping. The 5V lin-

ear regulator takes its input from the battery; for efficiency, the

output is switched to the 5V output when available. The 12V lin-

ear regulator output is generated from a coupled inductor off the

5V switching regulator.

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 oscilla-

tor 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 SC1404 includes a PSAVE# input to select pulse skipping

mode for high efficiency at light load, or fixed frequency mode for

low noise operation.

6 to 30V input range (operation possible below 6V)

3.3V and 5V dual synchronous outputs

Fixed-frequency or PSAVE for maximum efficiency over

wide load current range

5V/50mA linear regulator

12V/200mA linear regulator

Virtual Current Sense

TM for enhanced stability

Accurate low-loss current limiting

Out-of-phase switching reduces input capacitance

External compensation supports wide range of

output filter components for reduced cost

Programmable power-up sequence

Power Good output

Output overvoltage & overcurrent protection with output

undervoltage shutdown

4µA typical shutdown current

6mW typical quiescent power

Notebook and Subnotebook Computers

Automotive Electronics

Desktop DC-DC Converters

Revision: May 19, 2004

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Аналогичное описание - SC1404

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Аналогичный номер детали - SC1404

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