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SPX1083
8A Low DropOut Voltage Regulator Adjustable & Fixed 3.3V
FEATURES
* Adjustable Output Down to 1.2V or Fixed 3.3V & 5V * Output Current of 8A * Low Dropout Voltage * Extremely Tight Load and Line Regulation * Current & Thermal Limiting * Standard 3-Terminal Low Cost TO-220 * Similar to Industry Standard LT1083/LT1584
APPLICATIONS
* Powering Intel Pentium P from +5V Supplies * Power PC Supplies * SMPS Post-Regulator * High Efficiency "Green" Computer Systems * High Efficiency Linear Power Supplies * Portable Instrumentation * 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 IQ 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 VOUT VIN
Front View
Rev. 10/23/00
SPX1083
ABSOLUTE MAXIMUM RATINGS
Power Dissipation..........................................Internally Limited Lead Temp. (Soldering, 10 Seconds) .............................. 300C Storage Temperature Range ............................ -65 to +150C Operating Junction Temperature Range SPX1083 Control Section..........................0C to +125C SPX1083 Power Transistor........................0C to +150C Input Supply Voltage ...................................................... 30V Input to Output Voltage Differential ............................... 30V
ELECTRICAL CHARACTERISTICS (Note 1) at IOUT = 10mA, TA = 25C, 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 VIN - VOUT=3V IOUT =3A, COUT = 25F, CADJ = 25F, f= 120Hz 10Hz to 10kHz TO-220 Junction to Tab Junction to Ambient SPX1083-3.3V, 0IOUT8A, 4.75VVIN25V SPX1083-3.3V, 0IOUT8A, 6.5VVIN25V 10 mA IOUT IFULLLOAD 3.3V(VIN - VOUT ) VIN MAX - VOUT MAX (VIN- VOUT) = VIN MAX - VOUT MAX 29V VIN - VOUT VIN MAX - VOUT MAX ILOAD = 10mA 10mA IOUT IFULLLOAD (VIN - VOUT)=3V IOUT=IFULLLOAD , VREF=1% VIN - VOUT=5V TA=125C, 1000Hrs. TA=25C 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 % A A %/W % dB V
Conditions Typ
SPX1083A Min Max
Min
SPX1083 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
% VO 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 10F 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 -40C T J 150C 0C T J 120C
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
-55C IFULLLOAD 25C 150C
1
T J =25C T J =150C T J = -55C
0 01 2 3 4 5 67 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 (A)
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 =-55C T J =25C T J =150C
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 (C)
TEMPERATURE (C)
Rev. 10/23/00
SPX1083
TYPICAL APPLICATIONS
VIN C1
IN
SPX1083
ADJ
OUT R1
VIN C1
OUT IN
SPX1083
ADJ VREF C2 R1
VOUT
LOAD
VOUT = VREF (1 + R2 ) + IADJ R2 R1
R2
Fig. 4 8A Current output Regulator
Fig. 5 Typical Adjustable Regulator
Intel PentiumTM
3.45V VIN +5V C1 ADJ R1 IN
SPX1083
VCC C2
OUT
R2
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 hereing; neither does it convey any licens
Rev. 10/23/00

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