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SPX1582U

更新时间： 2024-11-15 22:53:27
品牌 Logo 应用领域
西伯斯 - SIPEX 稳压器
页数 文件大小 规格书
7页 57K
描述
3A Ultra Low Dropout Voltage Regulator Fast Response, Adjustable & Fixed

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SPX1582U 数据手册

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®
SPX1582  
3A Ultra Low Dropout Voltage Regulator  
Fast Response, Adjustable & Fixed  
FEATURES  
■Low Dropout Voltage 500mV at 3A Full Load Current  
■Adjustable Ouput Down to 1.25V from ATX Power Supply  
■Fixed Output Voltages of 3.3V and 2.5V  
SPX1582  
SPX1582  
5 Pin TO-263  
5 Pin TO-220  
1
2
3
■Extremely Tight Load and Line Regulation  
4
5
1
2
3
■Standard 5-Terminal Low Cost TO-220 and TO-263  
APPLICATIONS  
■3.3V to 2.8V ATX Power Supplies  
■3.3V to 2.9V for Portable PENTIUMTM Processor  
■5V to 3.5V VRE Supply  
■High efficiency "Green" Computer Systems  
Now Available in Lead Free Packaging  
DESCRIPTION  
The SPX1582 is a 3A Low Dropout Regulator with extremely low dropout voltage. The adjustable version requires only  
two external resistors to set the output voltage. The fixed version has a preset output of 3.3V, 2.8V or 2.5V and does  
not require any external resistors. The SPX1582 features a low dropout of 400mV(Typ.) and offers fast transient  
response. This device is suitable for Pentium applications requiring 2.8V, 2.5V from 3.3V ATX power supplies, where  
a low current input voltage 1V greater than the output voltage is needed. With an external sense pin the load regulation  
is less than 1mV. This device is an excellent choice for the use of powering low voltage microprocessors that require  
alowerdropout,fasttransientresponsetoregulatefrom3.3Vand5Vsupplies.TheSPX1582isalsoanexcellentchoice  
as a post regulator for switching supplies applications.  
The SPX1582 offers protection against over-current faults, reversed input polarity, over temperature operation and  
positive and negative transient voltage.  
The SPX1582 is offered in a 5 pin TO-220 and TO-263 compatible with industry standard 5-terminal regulators. For 5A,  
3A and 1.5A ultra low dropout versions refer to SPX1581, SPX1582 and SPX1583 data sheets respectively.  
TYPICAL APPLICATIONS CIRCUIT  
V
V
OUT  
IN  
2.5V  
OUT  
3.3V  
IN  
5
4
3
V
V
V
V
OUT  
2.5V  
OUT  
IN  
3.3V  
IN  
SPX1582  
C1  
330µF  
5
4
3
V
V
SPX1582  
C1  
330µF  
5V  
V
1
2
5V  
V
V
CTRL  
1
CTRL  
SENSE  
2
CTRL  
V
CTRL  
SENSE  
R1  
124Ω  
ADJ  
GND  
C4  
2x330µF  
C2  
10µF  
C4  
2x330µF  
C2  
10µF  
C3  
.033µF  
R2  
124Ω  
(1) V  
CTRL  
needed when V < 5V.  
IN  
(1) V  
(2) V  
(3) V  
needed when V < 5V.  
IN  
CTRL  
= V  
REF  
(1+R /R )+I R .  
OUT  
REF  
2
1
ADJ 2  
is measured across adjust to sense.  
Adjustable Regulator  
Typical Fixed Regulator  
Date:5/25/04  
SPX1582 3A Ultra Low Dropout Voltage Regulator  
©Copyright 2004 Sipex Corporation  
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