Rev. 10/30/00
SPX1584
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 PCSupplies
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 SPX1584 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 SPX1584 features low dropout of a maximum 1.5 volts.
The SPX1584 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 SPX1584 is offered in a 3-pin TO-220 package compatible with older 3-terminal regulators. For a 5A low dropout regulator refer
to the SPX1585 datasheet.
Front View
TO-220-3 (U)
SPX1584
1
2
3
ADJ/GND V
OUT
V
IN
PIN CONNECTIONS
Rev. 10/30/00
SPX1584
ABSOLUTE MAXIMUM RATINGS
Power Dissipation..........................................Internally Limited
Input Supply Voltage .................................................... +10V
Lead Temp. (Soldering, 10 Seconds) .............................. 300C
Input to Output Voltage Differential .............................. 8.8V
Storage Temperature Range ............................ -65 to +150C
Operating Junction Temperature Range
SPX1584 Control Section..........................0C to +125C
SPX1584 Power Transistor........................0C to +150C
ELECTRICAL CHARACTERISTICS
(Note 1) at I
OUT
= 10mA, T
A
= 25
C, unless otherwise specified.
Parameter
Conditions SPX1584A
SPX1584 Units
Typ Min Max Min Max
3.3V Version
Output Voltage (Note 2)
SPX1584-3.3V, 0
I
OUT
1.5A,
4.75V
V
IN
7V
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)
SPX1584-3.3V, 0
I
OUT
1.5A,
6.5V
V
IN
7V
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
10mA
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
1.5V
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
(VI
N
- 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 SPX1584
Rev. 10/30/00
SPX1584
TYPICAL CHARACTERISTICS
Rev. 10/30/00
SPX1584
TYPICAL APPLICATIONS
LOAD
ADJ
SPX1584
8A Current Output Regulator
V
IN
C
1
R
1
OUT
IN
Pentium Processor is a trademark of Intel Corp. Power PC is a trademark of IBM Corp.
IN
OUT
ADJ
SPX1584
C
1
R
1
R
2
Powering Intel Pentium
TM
with SPX1584
V
IN
I
n
te
l P
e
n
t
iu
m
TM
+5V
C
2
3.45V
V
CC
IN
OUT
ADJ
SPX1584
C
1
R
1
R
2
V
OUT
Typical Adjustable Regulator
V
OUT
= V
REF
2
+ I
ADJ
V
IN
C
2
R
1
V
REF
R
1+
R
2
Rev. 10/30/00
SPX1584
ORDERING INFORMATION
Ordering No.
Precision
Output Voltage
Packages
SPX1584U
2%
Adj
3 Lead TO-220
SPX1584U-3.3
2%
3.3V
3 Lead TO-220
SPX1584U-5.0
2%
5.0V
3 Lead TO-220
SPX1584AU
1%
Adj
3 Lead TO-220
SPX1584AU-3.3
1%
3.3V
3 Lead TO-220
SPX1584AT-5.0
1%
5.0V
3 Lead TO-263
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 license under its patent rights nor the rights of others.
Corporation
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