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SPX1580 Fiches technique(PDF) 1 Page - Sipex Corporation

No de pièce SPX1580
Description  7A Ultra Low Dropout Voltage Regulator Fast Response, Adjustable & Fixed
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Fabricant  SIPEX [Sipex Corporation]
Site Internet  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SPX1580 Fiches technique(HTML) 1 Page - Sipex Corporation

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Date: 5/14/04
SPX1580 7A Ultra Dropout Voltage Regulator
©Copyright 2004 Sipex Corporation
SPX1580
DESCRIPTION
FEATURES
■ Low Dropout Voltage 540mV at 7A Full Load Current
■ Adjustable Ouput Down to 1.25V from ATX Power Supply
■ Fixed Output Voltages of 3.3V and 2.5V
■ Extremely Tight Load and Line Regulation
■ Standard 5-Terminal Low Cost TO-220 and TO-263
■ Replacement to Industry Standard LT1580
®
The SPX1580 is a 7A 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
or 2.5V and does not require any external resistors. The SPX1580 features a low dropout of 540mV(Typ.)
and offers fast transient response. This device is suitable for Pentium applications requiring 2.5V from 3.3V
ATX power supplies, where a low current input voltage 1V greater than the output voltage is available. 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 a lower dropout, fast transient response to regulate
from 3.3V and 5V supplies. The SPX1580 is also an excellent choice as a post regulator for switching
supplies applications.
The SPX1580 offers protection against over-current faults, reversed input polarity, over temperature
operation and positive and negative transient voltage.
The SPX1580 is offered in a 5 pin TO-220 and TO-263 compatible with industry standard 5-terminal
regualtors. For 5A, 3A and 1.5A ultra low dropout versions refer to SPX1581, SPX1582 and SPX1583 data
sheets respectively.
7A Ultra Dropout Voltage Regulator
Fast Response, Adjustable & Fixed
APPLICATIONS
■ 3.3V ATX Power Supplies
■ 3.3V to 2.9V for Portable PENTIUMTM Processor
■ 5V to 3.5V VRE Supply
■ High efficiency "Green" Computer Systems
C4
68µF
2.5V
VOUT
R1
124Ω
R2
124Ω
VOUT
SENSE
C2
10µF
VCTRL
C1
33µF
3.3V
VIN
5V
VCTRL
SPX1580
5
4
2
3
1
(1) VCTRL needed when VIN < 5V.
(2) VOUT = VREF (1+R2/R1)+IADJ R2.
(3) VREF is measured across adjust to sense.
ADJ
VIN
C4
68µF
2.5V
VOUT
VOUT
SENSE
C2
10µF
VCTRL
C1
33µF
3.3V
VIN
5V
VCTRL
SPX1580
5
4
2
3
1
(1) VCTRL needed when VIN < 5V.
GND
VIN
3
2
1
SPX1580
5 Pin TO-220
4 5
12
3
SPX1580
5 Pin TO-263
TYPICAL APPLICATIONS CIRCUITS
Now Available in Lead Free Packaging


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