SPX1580U5-L-3.3 [SIPEX]
Fixed Positive LDO Regulator, 3.3V, 0.8V Dropout, PSFM5, TO-220, 5 PIN;![SPX1580U5-L-3.3](http://pdffile.icpdf.com/pdf2/p00307/img/icpdf/SPX1580U5-L-_1850136_icpdf.jpg)
型号: | SPX1580U5-L-3.3 |
厂家: | ![]() |
描述: | Fixed Positive LDO Regulator, 3.3V, 0.8V Dropout, PSFM5, TO-220, 5 PIN |
文件: | 总8页 (文件大小:88K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
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®
SPX1580
7A Ultra Dropout Voltage Regulator
Fast Response, Adjustable & Fixed
FEATURES
■ Low Dropout Voltage 540mV at 7A Full Load Current
SPX1580
5 Pin TO-263
■ Adjustable Ouput Down to 1.25V from ATX Power Supply
■ Fixed Output Voltages of 3.3V and 2.5V
SPX1580
1
2
3
5 Pin TO-220
4
5
1
2
3
■ Extremely Tight Load and Line Regulation
■ Standard 5-Terminal Low Cost TO-220 and TO-263
■ Replacement to Industry Standard LT1580
APPLICATIONS
■ 3.3V ATX Power Supplies
■ 3.3V to 2.9V for Portable PENTIUMTM Processor
■ 5V to 3.5V VRE Supply
Now Available in Lead Free Packaging
■ High efficiency "Green" Computer Systems
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.)
andoffersfasttransientresponse. ThisdeviceissuitableforPentiumapplicationsrequiring2.5Vfrom3.3V
ATXpowersupplies, wherealowcurrentinputvoltage1Vgreaterthantheoutputvoltageisavailable. 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. For5A, 3Aand1.5AultralowdropoutversionsrefertoSPX1581, SPX1582andSPX1583data
sheets respectively.
TYPICAL APPLICATIONS CIRCUITS
V
V
OUT
IN
2.5V
OUT
3.3V
IN
V
V
OUT
2.5V
IN
5
4
3
3.3V
IN
V
V
5
4
3
V
OUT
SPX1580
V
C1
33µF
SPX1580
C1
33µF
5V
V
1
5V
V
1
2
V
CTRL
CTRL
SENSE
2
V
CTRL
CTRL
SENSE
R1
124Ω
ADJ
GND
C4
68µF
C4
68µF
C2
10µF
C2
10µF
R2
124Ω
(1) V
(2) V
(3) V
needed when V < 5V.
IN
CTRL
OUT
REF
(1) V
needed when V < 5V.
IN
CTRL
= V
REF
(1+R /R )+I
R .
ADJ 2
2
1
is measured across adjust to sense.
Date: 5/16/04
SPX1580 7A Ultra Dropout Voltage Regulator
©Copyright 2004 Sipex Corporation
1
ABSOLUTE MAXIMUM RATINGS
Power Dissipation ..................................... Internally Limited
Lead Temp. (Soldering, 10 Seconds) ......................... 300°C
Storage Temperature Range ..................... -65°C to +150°C
Operating Junction Temperature Range
Input Supply Voltage ..................................................... 7V
VCTRL Input Voltage .................................................... 13.2V
SPX1580 Control Section ............................. 0°C to +125°C
SPX1580 Power Transistor .......................... 0°C to +150°C
ELECTRICAL CHARACTERISTICS
Electrical characteristics at VOUT = VSENSE, VADJ = 0V, TA = 25ºC, CCTL = CPWR = COUT = 33µF tantalum cap unless otherwise specified.
The ♦ denotes the specifications which apply over the -40°C to 85°C temperature range, unless otherwise specified.
PARAMETER
2.5V Version
CONDITIONS
MIN.
TYP.
MAX.
UNITS
Output Voltage
2.45
2.40
2.5
2.5
2.55
2.60
VCTRL = 4.5V to 12V, VIN = VOUT
+0.8V, IO = 10mA to 7A
♦
V
3.3V Version
♦
♦
Output Voltage
3.234
3.168
3.3
3.3
3.366
3.432
VCTRL = 4.5V to 12V, VIN = VOUT
+0.8V, IO = 10mA to 7A
V
V
All Voltage Options
Reference Voltage (Note 3)
VCTRL = 4.5V, VIN = 2.05V, IO =
10mA
1.237
1.231
1.25
-
1.263
1.269
VCTRL = 4.5V, VIN = 2.05V, IO =
10mA to 7A
♦
Line Regulation
-
-
-
-
1.0
-
-
VCTRL = 4.5V to 12V, VIN = VOUT
0.8V to 5.5V, IO = 10mA
+
mV
mV
♦
♦
3.0
-
Load Regulation (Note 1)
1.1
-
VCTRL = 4.5V to 12V, VIN = VOUT
0.8V, IO = 10mA
+
5.0
Dropout Voltage Minimum
VIN (Note 2) (VIN - VOUT)
VCTRL = 4.75V, IO = 7A
0.54
-
0.80
-
V
A
Current Limit
VCTRL = 4.5V, VIN = 2.05V,
VOUT = 100mV
7.1
Minimum Load Current
-
-
5
-
-
VCTRL = 5V, VIN=VOUT + 0.8V
mA
♦
10
Thermal Regulation
Ripple Rejection
-
0.002
80
60
-
0.02
%/W
dB
30mS Pulse
60
-
-
VCTRL = 5V, VIN = 5V, IO = 7A
Control Pin Current
-
VCTRL = 4.5V, VIN=VOUT + 0.8V, IO
= 7A
mA
µA
♦
♦
-
130
Adjustable Pin Current
-
50
-
VCTRL = 4.5V, VIN= 2.05V, IO =
10mA
120
Thermal Resistance
TO-220 & TO-263
-
-
2
-
-
Junction to Case (Ø )
JC
ºC/W
60
Junction to Ambient (Ø )
JC
Date: 5/16/04
SPX1580 7A Ultra Dropout Voltage Regulator
©Copyright 2004 Sipex Corporation
2
PIN DESCRIPTION
Pin Number
Pin Name
DESCRIPTION
Allows Kelvin sense of VOUT at load. (Positive side of the reference
voltage of the device)
1
SENSE
Negative side of the reference voltage for the device. Adding a
small bypass capacitor from ADJ pin to ground will improve the
transient response.
2
3
ADJ
VOUT
Power output of the device.
Supply pin for the control circuitry of the device. The current flow
into this pin will be about 1% of the output current. VCTRLmust be
between 0.1V and 1.3V greater than the ouput voltage for the
device to regulate.
4
5
VCTRL
Output load current is supplied through this pin. VIN must be
between 0.1V and 0.8V greater than the output voltage for this
device to regulate.
VIN
Note that TAB is internally connected to Pin 3.
BLOCK DIAGRAM
(4) VCTRL
VIN (5)
S.O.A
LIMIT
CURRENT
LIMIT
AMPLIFIER
V
OUT (3)
SENSE
THERMAL OVERLOAD
SENSE (1)
ADJ (2)
VOLTAGE
REGULATION
AMPLIFIER
VREF
APPLICATION INFORMATION
The SPX1580 is designed as a high performance
and low cost solution for application requiring a
lower dropout than traditional NPN regulators.
A typical application would use 3.3V for VIN
and 5.0V for VCTRL from a motherboard power
supply to provide a nominal 2.5V output. Using
the sense pin allows Kelvin measure the output,
reducing resistance-associated errors.
TheSPX1580usesaseparateinputvoltageVCTRL
( VCTRL ≥ VOUT + 1.3V) to minimize the dropout
voltage. This allows the 2.5V power for the load
to come from a 3.3V system supply.
As added benefit this will reduce the heat dissi-
pation*, andlowerheatsinkandcoolingfancost.
The SPX1580 can power the 2.5V core voltage
TM
for microprocessors such as a PentiumPC
,
TM
TM
TM
P55C , AMD5k86 and K6 and the IBM
PowerPC 603EV and 604EV processors.
TM
Date: 5/16/04
SPX1580 7A Ultra Dropout Voltage Regulator
©Copyright 2004 Sipex Corporation
3
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.
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 0.3Ω.
Adjustable Regulator Design
1.25V reference voltage is being developed be-
tween the SENSE pin and the ADJ pin of the
SPX1580.Addingtwoexternalresistors(seefig
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.
V
V
OUT
2.5V
OUT
IN
3.3V
IN
5
3
V
V
SPX1580
C1
33µF
5V
V
4
1
2
V
CTRL
CTRL
SENSE
R1
124Ω
ADJ
C3
68µF
C2
10µF
C4
0.033µF
R2
124Ω
(1) V
(2) V
(3) V
needed when V < 5V.
IN
CTRL
OUT
REF
= V
(1+R /R )+I
R .
ADJ 2
REF
2
1
is measured across adjust to sense.
Figure 1. Adjustable Regulator.
Date: 5/16/04
SPX1580 7A Ultra Dropout Voltage Regulator
©Copyright 2004 Sipex Corporation
4
V
V
V
OUT
2.5V
OUT
IN
3.3V
IN
5
4
3
V
V
SPX1580
5V
V
1
2
CTRL
CTRL
SENSE
C1
33µF
GND
C3
68µF
C2
10µF
(1) V
needed when V < 5V.
IN
CTRL
Figure 2. Typical Fixed Regulator.
Date: 5/16/04
SPX1580 7A Ultra Dropout Voltage Regulator
©Copyright 2004 Sipex Corporation
5
PACKAGE: 5 PIN TO-220
E
A
B
E/2
SEATING
PLANE
A
øP
Q
F
H1
D
D
D1
L1
CHAMFER
OPTIONAL
D
D
C
C
L
A
b
e
C1
e1
J1
Dimensions in
(inches)
5 PIN TO-220
MIN NOM MAX
A
b
.160
-
.190
.040
.022
.590
.415
.015
.014
.560
.385
.385
.062
-
C1
D
-
-
-
-
-
E
e
.415
.072
e1
.045
.234
.090
.540
-
.055
.258
.115
.560
.250
F
H1
-
-
-
-
J1
L
L1
∆P
Q
.146
-
-
.156
.103
.113
5 PIN TO-220
U
-
-
.30
.24
-
-
V
Date: 5/16/04
SPX1580 7A Ultra Dropout Voltage Regulator
©Copyright 2004 Sipex Corporation
6
PACKAGE: 5 PIN TO-263
SEATING PLANE
A
(DATUM A)
C2
H
E
1
2
3
5
4
c
L2
(E)
E
L1
D1
5X b
E1
e
4X
5 PIN TO-263
JEDEC TO-263
(BB) Variation
Dimensions in (mm)
MIN NOM MAX
A
A1
b
.160
0
-
-
-
.190
.010
.039
.029
.023
-
.020
.015
.045
.270
c
-
0º-8º
L3
c2
D1
E
-
-
L
.380
.245
-
.420
-
E1
-
(b)
e
.067 BSC
.625
WITH PLATING
c
H
.575
-
L
.070
-
.110
.066
.070
L1
L2
L3
-
-
-
-
.010 BSC
BASE METAL
CONTACT AREA
5 PIN TO-263
Date: 5/16/04
SPX1580 7A Ultra Dropout Voltage Regulator
©Copyright 2004 Sipex Corporation
7
ORDERING INFORMATION
Operating Temperature Range Package Type
Part Number
SPX1580U5 ................................................ -40°C to +85°C ........................................................ 5 Pin TO-220
SPX1580U5-2.5.......................................... -40°C to +85°C ....................................................... 5 Pin TO-220
SPX1580U5-3.3.......................................... -40°C to +85°C ....................................................... 5 Pin TO-220
SPX1580T5 ................................................ -40°C to +85°C ........................................................ 5 Pin TO-263
SPX1580T5/TR .......................................... -40°C to +85°C ........................................................ 5 Pin TO-263
SPX1580T5-2.5 .......................................... -40°C to +85°C ....................................................... 5 Pin TO-263
SPX1580T5-2.5/TR .................................... -40°C to +85°C ....................................................... 5 Pin TO-263
SPX1580T5-3.3 .......................................... -40°C to +85°C ....................................................... 5 Pin TO-263
SPX1580T5-3.3/TR .................................... -40°C to +85°C ....................................................... 5 Pin TO-263
Available in lead free packaging. To order add "-L" suffix to part number.
Example: SPX1580T5-3.3/TR = standard; SPX1580T5-L-3.3/TR = lead free
/TR = Tape and Reel
Pack quantity is 500 for TO-263.
Corporation
ANALOG EXCELLENCE
Sipex Corporation
Headquarters and
Sales Office
233 South Hillview Drive
Milpitas, CA 95035
TEL: (408) 934-7500
FAX: (408) 935-7600
Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the
application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others.
Date: 5/16/04
SPX1580 7A Ultra Dropout Voltage Regulator
©Copyright 2004 Sipex Corporation
8
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