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參數(shù)資料
| 型號： | SC339SKTRT |
| 廠商： | Semtech Corporation |
| 英文描述： | Ultra Low Output Voltage Linear FET Controller |
| 中文描述： | 超低輸出電壓線性場效應管控制器 |
| 文件頁數(shù)： | 1/15頁 |
| 文件大?。?/td> | 744K |
| 代理商： | SC339SKTRT |
1
www.semtech.com
SC339
Ultra Low Output Voltage
Linear FET Controller
POWER MANAGEMENT
Description
The SC339 is an ultra-low output voltage, linear power
supply controller designed to simplify power manage-
ment for notebook PCs. It is part of Semtech’s Smart
LDO
TM
family of products. The SC339 has a user
adjustable output that can be set anywhere between 0.5V
and 3.3V using two external resistors.
Sept 11, 2006
Features
SC339 features include tight output voltage regulation (±
1% over 0°C to +85°C), enable control, open drain power
good signal, under-voltage protection and soft-start. The
enable pin allows the part to enter a very low power standby
mode. Pulling it high enables the output. The power good
pin is an open drain and asserts low when the voltage at
the adjust pin is below 88% (typ) of nominal. If the voltage
at the adjust pin is below 50% (typ) of nominal, the under-
voltage protection circuitry will shut down the output. The
SC339 is available in a tiny SOT-23 6-pin surface mount
package.
± 1% Voltage Accuracy Over-Temperature
Low Shutdown Current
Runs Off 5V Supply
Ultra-Fast Transient Response
Enable Control for the Output
Power Good Monitoring and Signaling for the Output
Gate Drive from Input Supply Enables Use of
N-Channel MOSFET
User Selectable Dropout Voltage
Under-Voltage Protection for the Output
SOT-23 6-pin Surface Mount Package
Compatible with Ceramic Capacitors
Low Ripple Output
Internal 1ms soft-start requires no external compo-
nents
Fully WEEE and RoHS compliant
Applications
Notebook PCs
Desktop Computers
Battery Powered Devices
Portable Instruments
Typical Application Circuit
1.05V @ 3A
SC339
IN
DRV
ADJ
PGD
EN
GND
C1
C2
C4
5V IN
1.05V
Enable
1.05V
Power Good
1.2V +/-5% IN
IRF7311
or similar
V
out
= (1+R1/R2)*0.5
Notes:
(1) Optional Components to use with ceramic output
capacitors (C2)
C3
(1)
R3
(1)
R1
R2
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