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.
PIN CONNECTIONS
TO-220-3 (U)
SPX1083
1
2
3
ADJ/GND V
OUT
V
IN
Front View
Rev. 10/23/00
SPX1083
ABSOLUTE MAXIMUM RATINGS
Power Dissipation..........................................Internally Limited
Lead Temp. (Soldering, 10 Seconds) .............................. 300°C
Storage Temperature Range ............................ -65° to +150°C
Operating Junction Temperature Range
SPX1083 Control Section..........................0C° to +125°C
SPX1083 Power Transistor........................0C° to +150°C
Input Supply Voltage ...................................................... 30V
Input to Output Voltage Differential ............................... 30V
ELECTRICAL CHARACTERISTICS
(Note 1) at I
OUT
= 10mA, T
A
= 25°C, unless otherwise specified.
Parameter
3.3V Version
Output Voltage (Note 2)
5.0V Version
Output Voltage (Note 2)
All Voltage Options
Reference Voltage
Mid Load Current
Line Regulation
Load Regulation
Dropout Voltage
Current Limit
Long Term Stability
Adjust Pin Current
Adjust Pin Current
Change
Thermal Regulation
Temperature Stability
Ripple Rejection Ratio
V
IN
- V
OUT
=3V
I
OUT
=3A, C
OUT
= 25µF, C
ADJ
= 25µF,
f= 120Hz
10Hz to 10kHz
TO-220
Junction to Tab
Junction to Ambient
SPX1083-3.3V, 0≤I
OUT
≤8A,
4.75V≤V
IN
≤25V
SPX1083-3.3V, 0≤I
OUT
≤8A,
6.5V≤V
IN
≤25V
10 mA
≤
I
OUT
≤
I
FULLLOAD
3.3V≤(V
IN
- V
OUT
)≤ V
IN MAX
– V
OUT MAX
(V
IN
- V
OUT
) = V
IN MAX
– V
OUT MAX
29V
≤V
IN
- V
OUT
≤
V
IN MAX
– V
OUT MAX
I
LOAD
= 10mA
10mA
≤
I
OUT
≤
I
FULLLOAD
(V
IN
- V
OUT
)=3V
I
OUT
=I
FULLLOAD
,
∆V
REF
=1%
V
IN
- V
OUT
=5V
T
A
=125°C, 1000Hrs.
T
A
=25°C
3.3
3.3
5.0
5.0
1.250
1.250
5
0.015
0.05
0.1
0.2
1.1
9.5
0.3
55
0.2
30ms pulse
0.003
0.5
75
60
60
3.270
3.240
4.950
4.900
1.238
1.225
3.330
3.360
5.050
5.100
1.262
1.270
10
0.2
0.5
0.3
0.4
1.2
3.230
3.201
4.900
4.650
1.238
1.225
3.370
3.399
5.100
5.150
1.262
1.270
10
0.2
0.5
0.3
0.4
1.2
V
mA
%
%
V
A
1
90
5
0.01
%
µA
µA
%/W
%
dB
V
Conditions
Typ
SPX1083A
Min
Max
SPX1083
Min
Max
Units
8.0
1
90
5
0.01
8.0
Output Noise, RMS
Thermal Resistance
Junction-to-Case
0.003
2.7
0.65
2.7
0.65
% V
O
°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 10µF output capacitor is required on SPX1083
Rev. 10/23/00
SPX1083
TYPICAL CHARACTERISTICS
DROPOUT VOLTAGE
LOAD REGULATION
SHORT CIRCUIT CURRENT
2
MINIMUM INPUT/OUTPUT DIFFERENTIAL (V)
OUTPUT VOLTAGE DEVIATION (%)
0.05
0
-0.05
-0.10
-0.15
-0.20
SHORT CIRCUIT CURRENT (A)
INDICATES GUARANTEED TEST
POINT
-40ºC T
J
150ºC
0ºC T
J
120ºC
0.10
12
10
8
6
4
2
0
-25
0
25
50
75 100 125 150
0
5
10
15
20
25
30 35
-55ºC
I
FULLLOAD
25ºC
150ºC
1
T
J
=25ºC
T
J
=150ºC
T
J
= -55ºC
0
0 1
2
3
4
5
6 7
8
9
10
-50
OUTPUT CURRENT (A)
MINIMUM OPERATING CURRENT
INPUT/OUTPUT DIFFERENTIAL (V)
ADJUSTMENT PIN CURRENT
INPUT/OUTPUT DIFFERENTIAL (V)
TEMPERATURE STABILITY
10
9
MINIMUM OPERATING CURRENT
ADJUSTMENT PIN CURRENT (µA)
100
90
REFERENCE VOLTAGE (V)
1.270
8
7
6
5
4
3
2
1
0
0
5
10
15 20
25
30
35
T
J
=-55ºC
T
J
=25ºC
T
J
=150ºC
80
70
60
50
40
30
20
10
0
-50
-25
0
25
50
75
100 125 150
1.260
1.250
1.240
1.230
-50
-25
0
25
50
75
100 125 150
INPUT/OUTPUT DIFFERENTIAL (V)
TEMPERATURE (ºC)
TEMPERATURE (ºC)
Rev. 10/23/00
SPX1083
TYPICAL APPLICATIONS
V
IN
C
1
IN
SPX1083
ADJ
OUT
R
1
V
IN
C
1
OUT
IN
SPX1083
ADJ
V
REF
C
2
R
1
V
OUT
LOAD
V
OUT
= V
REF
(1 + R
2
) + I
ADJ
R
2
R
1
R
2
Fig. 4 8A Current output Regulator
Fig. 5 Typical Adjustable Regulator
Intel Pentium
TM
3.45V
V
IN
+5V
C
1
ADJ
R
1
IN
SPX1083
V
CC
C
2
OUT
R
2
TM
Powering Intel Pentium with SPX1083
Pentium Processor is a trademark of Intel Corp. Power PC is a trademark of IBM Corp.
Rev. 10/23/00
SPX1083
ORDERING INFORMATION
Ordering No.
SPX1083U
SPX1083U-3.3
SPX1083U-5.0
SPX1083AU
SPX1083AU-3.3
SPX1083AT-5.0
Precision
2%
2%
2%
1%
1%
1%
Output Voltage
Adj
3.3V
5.0V
Adj
3.3V
5.0V
Packages
3 Lead TO-220
3 Lead TO-220
3 Lead TO-220
3 Lead TO-220
3 Lead TO-220
3 Lead TO-220
Corporation
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
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