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SPX1581T5-L-2.8/TR

Description
Fixed Positive LDO Regulator, 2.8V, 0.5V Dropout, PSSO5, LEAD FREE, TO-263BB, 5 PIN
CategoryPower/power management    The power supply circuit   
File Size89KB,7 Pages
ManufacturerSIPEX
Websitehttp://www.sipex.com/
Environmental Compliance
Download Datasheet Parametric View All

SPX1581T5-L-2.8/TR Overview

Fixed Positive LDO Regulator, 2.8V, 0.5V Dropout, PSSO5, LEAD FREE, TO-263BB, 5 PIN

SPX1581T5-L-2.8/TR Parametric

Parameter NameAttribute value
Is it Rohs certified?conform to
MakerSIPEX
package instructionLEAD FREE, TO-263BB, 5 PIN
Reach Compliance Codeunknown
Maximum drop-back voltage 10.5 V
Maximum input voltage5.5 V
Minimum input voltage1.75 V
JESD-30 codeR-PSSO-G5
JESD-609 codee3
length10.16 mm
Humidity sensitivity level3
Number of functions1
Number of terminals5
Working temperatureTJ-Max125 °C
Working temperature TJ-Min
Maximum output current 15 A
Maximum output voltage 12.912 V
Minimum output voltage 12.688 V
Nominal output voltage 12.8 V
Package body materialPLASTIC/EPOXY
encapsulated codeTO-263
Package shapeRECTANGULAR
Package formSMALL OUTLINE
Peak Reflow Temperature (Celsius)245
Certification statusNot Qualified
Regulator typeFIXED POSITIVE SINGLE OUTPUT LDO REGULATOR
Maximum seat height4.826 mm
surface mountYES
Terminal surfaceMatte Tin (Sn)
Terminal formGULL WING
Terminal pitch1.7 mm
Terminal locationSINGLE
Maximum time at peak reflow temperature40
Base Number Matches1
®
SPX1581
5A Ultra Low Dropout Voltage Regulator
Fast Response, Adjustable & Fixed
FEATURES
Low Dropout Voltage 500mV at 5A Full Load Current
Adjustable Ouput Down to 1.2V from ATX Power Supply
Fixed Output Voltages of 3.3V, 2.8V and 2.5V
Extremely Tight Load and Line Regulation
Standard 5-Terminal Low Cost TO-220 and TO-263
ADJ OR FIXED
SENSE
V
CNTRL
V
OUT
V
IN
SPX1581
5 Pin TO-263
SPX1581
5 Pin TO-220
1 2 3 4 5
1 2 3 4 5
APPLICATIONS
3.3V to 2.8V ATX Power Supplies
3.3V to 2.9V for Portable PENTIUM
TM
Processor
5V to 3.5V VRE Supply
High efficiency "Green" Computer Systems
ADJ OR FIXED
SENSE
Now Available in Lead Free Packaging
DESCRIPTION
The SPX1581 is a 5A 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 SPX1581 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
a lower dropout, fast transient response to regulate from 3.3V and 5V supplies. The SPX1581 is also an excellent choice
as a post regulator for switching supplies applications.
The SPX1581 offers protection against over-current faults, reversed input polarity, over temperature operation and
positive and negative transient voltage.
The SPX1581 is offered in a 5 pin TO-220 and TO-263 compatible with industry standard 5-terminal regulators. For
7A, 3A and 1.5A ultra low dropout versions refer to SPX1580, SPX1582 and SPX1583 data sheets respectively.
TYPICAL APPLICATIONS CIRCUIT
3.3V
V
IN
5V
V
CTRL
V
IN
C1
330µF
V
CTRL
5
SPX1581
4
2
ADJ
C2
10µF
C3
.033µF
R2
124Ω
1
SENSE
R1
124Ω
C4
2x330µF
3
V
OUT
2.5V
V
OUT
3.3V
V
IN
5V
V
CTRL
V
IN
C1
330µF
V
CTRL
5
SPX1581
4
2
GND
C2
10µF
1
SENSE
3
V
OUT
2.5V
V
OUT
V
CNTRL
V
OUT
V
IN
C4
2x330µF
(1) V
CTRL
needed when V
IN
< 5V.
(2) V
OUT
= V
REF
(1+R
2
/R
1
)+I
ADJ
R
2
.
(3) V
REF
is measured across adjust to sense.
(1) V
CTRL
needed when V
IN
< 5V.
Adjustable Regulator
Typical Fixed Regulator
Date: 1/21/05
SPX1581 5A Ultra Low Dropout Voltage Regulator
©Copyright 2005 Sipex Corporation
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