SPX1580T5 Sipex Corporation, SPX1580T5 Datasheet
SPX1580T5
Manufacturer Part Number
SPX1580T5
Description
Manufacturer
Sipex Corporation
Specifications of SPX1580T5
Date_code
06
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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
3.3V
V
5V
V
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.
APPLICATIONS
■ 3.3V ATX Power Supplies
■ 3.3V to 2.9V for Portable PENTIUM
■ 5V to 3.5V VRE Supply
■ High efficiency "Green" Computer Systems
IN
CTRL
Date: 5/16/04
C1
33µF
V
IN
V
CTRL
C2
10µF
5
4
(1) V
(2) V
(3) V
SPX1580
®
2
CTRL
OUT
REF
ADJ
is measured across adjust to sense.
= V
needed when V
3
REF
1
(1+R
TM
SENSE
V
OUT
Processor
2
/R
SPX1580 7A Ultra Dropout Voltage Regulator
1
IN
)+I
< 5V.
ADJ
R
R1
124Ω
R2
124Ω
2
.
7A Ultra Dropout Voltage Regulator
C4
68µF
2.5V
V
1
OUT
3.3V
V
5V
V
Fast Response, Adjustable & Fixed
IN
CTRL
Now Available in Lead Free Packaging
TYPICAL APPLICATIONS CIRCUITS
1
5 Pin TO-220
SPX1580
C1
33µF
2
3
V
V
IN
CTRL
C2
10µF
4 5
5
4
(1) V
SPX1580
2
CTRL
©Copyright 2004 Sipex Corporation
GND
needed when V
3
1
SPX1580
V
DESCRIPTION
OUT
SENSE
1
SPX1580
5 Pin TO-263
IN
2
< 5V.
3
C4
68µF
2.5V
V
OUT
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