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Rev. 10/23/00
SPX1083
8A Low DropOut Voltage Regulator
Adjustable & Fixed 3.3V
FEATURES
APPLICATIONS
Adjustable Output Down to 1.2V or Fixed 3.3V & 5V Powering Intel Pentium P from +5V Supplies
Output Current of 8A
Power PC Supplies
Low Dropout Voltage
SMPS Post-Regulator
Extremely Tight Load and Line Regulation
High Efficiency "Green" Computer Systems
Current & Thermal Limiting
High Efficiency Linear Power Supplies
Standard 3-Terminal Low Cost TO-220
Portable Instrumentation
Similar to Industry Standard LT1083/LT1584
Constant Current Regulators
Adjustable Power Supplies
Battery Charger
PRODUCT DESCRIPTION
The SPX1083 is a low power 8A Adjustable Voltage Regulator that is very easy to use. It requires only 2 external resistors to set the
output voltage. This device is an excellent choice when using Powering Intel
Microprocessor to convert from +5V to 3.3V supplies,
and as a post regulator for switching supplies applications. The SPX1083 features low dropout of a maximum 1.5 volts.
The SPX1083 offers full protection against over-current faults, reversed input polarity, reversed load insertion, over temperature
operation, and positive and negative transient voltage. On-Chip trimming adjusts the reference voltage to 1%. The I
Q
of this device
flows into the load which increases efficiency.
The SPX1083 is offered in a 3-pin TO-220 package compatible with older 3-terminal regulators. For a 5A low dropout regulator refer
to the SPX1083 datasheet.
Front View
TO-220-3 (U)
SPX1083
1
2
3
ADJ/GND V
OUT
V
IN
PIN CONNECTIONS
Rev. 10/23/00
SPX1083
ABSOLUTE MAXIMUM RATINGS
Power Dissipation..........................................Internally Limited
Input Supply Voltage ...................................................... 30V
Lead Temp. (Soldering, 10 Seconds) .............................. 300C
Input to Output Voltage Differential ............................... 30V
Storage Temperature Range ............................ -65 to +150C
Operating Junction Temperature Range
SPX1083 Control Section..........................0C to +125C
SPX1083 Power Transistor........................0C to +150C
ELECTRICAL CHARACTERISTICS
(Note 1) at I
OUT
= 10mA, T
A
= 25
C, unless otherwise specified.
Parameter
Conditions SPX1083A
SPX1083 Units
Typ Min Max Min Max
3.3V Version
Output Voltage (Note 2)
SPX1083-3.3V, 0
I
OUT
8A,
4.75V
V
IN
25V
3.3
3.3
3.270
3.240
3.330
3.360
3.230
3.201
3.370
3.399
V
5.0V Version
Output Voltage (Note 2)
SPX1083-3.3V, 0
I
OUT
8A,
6.5V
V
IN
25V
5.0
5.0
4.950
4.900
5.050
5.100
4.900
4.650
5.100
5.150
All Voltage Options
Reference Voltage
10 mA
I
OUT
I
FULLLOAD
3.3V
(V
IN
- V
OUT
)
V
IN
MAX
V
OUT MAX
1.250
1.250
1.238
1.225
1.262
1.270
1.238
1.225
1.262
1.270
V
Mid Load Current
(V
IN
- V
OUT
) = V
IN
MAX
V
OUT
MAX
5
10
10
mA
Line Regulation
29V
V
IN
- V
OUT
V
IN
MAX
V
OUT MAX
I
LOAD
= 10mA
0.015
0.05
0.2
0.5
0.2
0.5
%
Load Regulation
10mA
I
OUT
I
FULLLOAD
(V
IN
- V
OUT
)=3V
0.1
0.2
0.3
0.4
0.3
0.4
%
Dropout Voltage
I
OUT
=I
FULLLOAD
,
V
REF
=1%
1.1 1.2 1.2 V
Current Limit
V
IN
- V
OUT
=5V
9.5 8.0 8.0
A
Long Term Stability
T
A
=125
C, 1000Hrs.
0.3 1
1 %
Adjust Pin Current
T
A
=25
C
55
90 90
A
Adjust Pin Current
Change
0.2 5
5
A
Thermal Regulation
30ms pulse
0.003
0.01
0.01
%/W
Temperature Stability
0.5
%
Ripple Rejection Ratio
V
IN
- V
OUT
=3V
I
OUT
=3A, C
OUT
= 25
F, C
ADJ
= 25
F,
f= 120Hz
75 60
60
dB
Output Noise, RMS
10Hz to 10kHz
0.003
% V
O
Thermal Resistance
Junction-to-Case
TO-220
Junction to Tab
Junction to Ambient
2.7
0.65
2.7
0.65
C/W
The Bold specifications apply to the full operating temperature range.
Note 1: Changes in output voltage due to heating effects are covered under the specification for thermal regulation.
Note 2: A 10
F output capacitor is required on SPX1083
Rev. 10/23/00
SPX1083
TYPICAL CHARACTERISTICS
REFERENCE VOLTAGE (V)
1.270
1.260
1.230
TEMPERATURE (C)
TEMPERATURE STABILITY
1.250
1.240
SHORT CIRCUIT CURRENT (A)
12
10
6
4
0
INPUT/OUTPUT DIFFERENTIAL (V)
8
2
0
5
10
15
20
25
30
SHORT CIRCUIT CURRENT
MINIMUM OPERATING CURRENT
7
6
3
0
INPUT/OUTPUT DIFFERENTIAL (V)
5
4
1
0
5
10
15 20
25
30
35
MINIMUM OPERATING CURRENT
MINIMUM INPUT/OUTPUT DIFFERENTIAL (V)
2
0
0
6
8
10
OUTPUT CURRENT (A)
DROPOUT VOLTAGE
9
7
5
1
OUTPUT VOLTAGE DEVIATION (%)
0.05
-0.05
-0.15
-0.20
-50
25
150
INPUT/OUTPUT DIFFERENTIAL (V)
LOAD REGULATION
-25
0
50
100 125
0
ADJUSTMENT PIN CURRENT (A)
90
50
20
TEMPERATURE (C)
40
30
10
0
ADJUSTMENT PIN CURRENT
100
60
70
80
25
50
75 100 125 150
0
-25
-50
25
50
75 100 125 150
0
-25
-50
2
8
10
9
35
75
4
3
2
1
-0.10
0.10
INDICATES GUARANTEED TEST
POINT
-40C T
J
150C
0C T
J
120C
T
J
=150C
T
J
=25C
T
J
= -55C
T
J
=150C
T
J
=-55C
T
J
=25C
I
FULLLOAD
-55C
150C
25C
Rev. 10/23/00
SPX1083
TYPICAL APPLICATIONS
Pentium Processor is a trademark of Intel Corp. Power PC is a trademark of IBM Corp.
IN
OUT
ADJ
SPX1083
C
1
R
1
R
2
Powering Intel Pentium
TM
with SPX1083
V
IN
I
n
te
l P
e
n
t
iu
m
TM
+5V
C
2
3.45V
V
CC
IN
OUT
ADJ
SPX1083
C
1
R
1
V
OUT
Fig. 5 Typical Adjustable Regulator
V
IN
LOAD
ADJ
SPX1083
Fig. 4 8A Current output Regulator
V
IN
C
1
OUT
IN
R
2
C
2
V
OUT
= V
REF
(1 + R
2
) + I
ADJ
R
2
R
1
R
1
V
REF
Rev. 10/23/00
SPX1083
ORDERING INFORMATION
Ordering No.
Precision
Output Voltage
Packages
SPX1083U
2%
Adj
3 Lead TO-220
SPX1083U-3.3
2%
3.3V
3 Lead TO-220
SPX1083U-5.0
2%
5.0V
3 Lead TO-220
SPX1083AU
1%
Adj
3 Lead TO-220
SPX1083AU-3.3
1%
3.3V
3 Lead TO-220
SPX1083AT-5.0
1%
5.0V
3 Lead TO-220
SIGNAL PROCESSING EXCELLENCE
Sipex Corporation
Headquarters and Main Offices:
22 Linnell Circle
Billerica, MA 01821
TEL: (978) 667-8700
FAX: (978) 670-9001
e-mail: sales@sipex.com
233 South Hillview Drive
Milpitas, CA 95035
TEL: (408) 935-7600
FAX: (408) 934-7500
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
hereing; neither does it convey any licens
Corporation
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