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부품번호 SPX1580 기능
기능 7A Ultra Low Dropout Voltage Regulator
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SPX1580 데이터시트, 핀배열, 회로
® SPX1580
7A Ultra Dropout Voltage Regulator
Fast Response, Adjustable & Fixed
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
SPX1580
5 Pin TO-220
123 45
SPX1580
5 Pin TO-263
1 23
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
Now Available in Lead Free Packaging
DESCRIPTION
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.
TYPICAL APPLICATIONS CIRCUITS
3.3V
VIN
5V
VCTRL
VIN
C1
33µF
VCTRL
5
4
SPX1580
2
3
1
ADJ
C2
10µF
VOUT
SENSE
R1
124
R2
124
2.5V
VOUT
3.3V
VIN
5V
VCTRL
C4
68µF
VIN 5
3 VOUT
C1 SPX1580
33µF
41
VCTRL
2
SENSE
C2
10µF
GND
2.5V
VOUT
C4
68µF
Date: 5/14/04
(1) VCTRL needed when VIN < 5V.
(2) VOUT = VREF (1+R2/R1)+IADJ R2.
(3) VREF is measured across adjust to sense.
SPX1580 7A Ultra Dropout Voltage Regulator
1
(1) VCTRL needed when VIN < 5V.
©Copyright 2004 Sipex Corporation




SPX1580 pdf, 반도체, 판매, 대치품
Output Capacitor
An output capacitor for SPX1580 is for circuit
compensation for the device to prevent
oscilliation. The minimum size of the output
capacitor is either a 330µF aluminum electro-
lytic capacitor or 33uF tantalum. Larger capaci-
tor values improve the regulator transient re-
sponse performance and increase surge load
capability. The output capacitor should have an
ESR not more than 0.3.
Adjustable Regulator Design
1.25V reference voltage is being developed be-
tween the SENSE pin and the ADJ pin of the
SPX1580. Adding two external resistors (see fig
1.) will allow setting the output voltage from
1.25V to 6V. R1 is chosen so that this current is
specified minimum load current of 10mA. R2 is
given by the formula: VOUT = VREF (1+ R2/R1)
+ IADJ (R2). The current flowing from the ADJ
pin is typicaly 50uA. This ADJ pin contributes
to the final VOUT but is usually neglected.
Connecting the sense pin to the top of the resis-
tor divider will improve load regualtion.
APPLICATION INFORMATION
Lowering Noise
Using the SENSE pin to Kelvin the load will
increase accuracy of the output voltage during
load regulation. For the fixed voltage device,
adding a bypass capacitor from ADJ pin to
ground improves transient response. A 330pF
ceramic capacitor is recommended.
3.3V
VIN
5V
VCTRL
VIN
C1
33µF
VCTRL
5
4
SPX1580
2
3
1
ADJ
C2
10µF
VOUT
SENSE
C4
0.033µF
R1
124
R2
124
2.5V
VOUT
C3
68µF
(1) VCTRL needed when VIN < 5V.
(2) VOUT = VREF (1+R2/R1)+IADJ R2.
(3) VREF is measured across adjust to sense.
Figure 1. Adjustable Regulator.
Date: 5/14/04
SPX1580 7A Ultra Dropout Voltage Regulator
4
©Copyright 2004 Sipex Corporation

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SPX1580 전자부품, 판매, 대치품
(DATUM A)
PACKAGE: 5 PIN TO-263
SEATING PLANE
A
C2
E
1 2 34 5
E
L2
4X e
5X b
5 PIN TO-263
JEDEC TO-263
(BB) Variation
A
A1
b
c
c2
D1
E
E1
e
H
L
L1
L2
L3
Dimensions in (mm)
MIN NOM MAX
.160 - .190
0 - .010
.020 - .039
.015 - .029
.045 -
.023
.270 - -
.380
- .420
.245 -
-
.067 BSC
.575
- .625
.070 - .110
- - .066
- - .070
.010 BSC
H
c
(E)
L1
D1
E1
0º-8º
L3
L
WITH PLATING
c
(b)
BASE METAL
CONTACT AREA
5 PIN TO-263
Date: 5/14/04
SPX1580 7A Ultra Dropout Voltage Regulator
7
©Copyright 2004 Sipex Corporation

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