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PDF SPX29302 Data sheet ( Hoja de datos )
| Número de pieza | SPX29302 | |
| Descripción | (SPX29300 - SPX29303) 3A High Current / Low Dropout Voltage Regulator Adjustable & Fixed Output / Fast Response Time | |
| Fabricantes | Sipex Corporation | |
| Logotipo |  |
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® SPX29300/01/02/03
3A High Current, Low Dropout Voltage Regulator
Adjustable & Fixed Output, Fast Response Time
FEATURES
■ Adjustable Output Down To 1.25V
■ 1% Output Accuracy
SPX29300
3 Pin TO-263
■ Output Current of 3A
1 23
■ Low Dropout Voltage of 450mV @ 3A
■ Extremely Tight Load and Line
Regulation
■ Extremely Fast Transient Response
VIN GND VOUT
Now Available in Lead Free Packaging
■ Reverse-Battery Protection
■ Zero Current Shutdown (5 pin version)
■ Error Flag Signal Output for Out of
Regulation State (5 pin version)
■ Standard TO-220 and TO-263
Packages
APPLICATIONS
■ Powering VGA & Sound Card
■ Power PC™ Supplies
■ SMPS Post Regulator
■ High Efficiency “Green” Computer
Systems
■ High Efficiency Linear Power Supplies
■ Constant Current Regulators
■ Adjustable Power Supplies
■ Battery Charger
DESCRIPTION
The SPX29300/01/02/03 are 3A, highly accurate voltage regulators with a low drop out
voltage of 450mV dropout (typical) @ 3A. These regulators are specifically designed for low
voltage applications that require a low dropout voltage and a fast transient response. They
are fully fault protected against over-current, reverse battery, and positive and negative
voltage transients. On-Chip trimming adjusts the reference voltage to 1% initial accuracy.
Other features in the 5 pin versions include Enable, and Error Flag.
The SPX29300/01/02/03 are offered in 3 & 5-pin TO-220 & TO-263 packages. For a 1.5A
version, refer to the SPX29150 data sheet.
TYPICAL APPLICATIONS CIRCUITS
VIN
+
6.8µF
1 SPX29300 3
2
VOUT
+ 10µF
VIN
+
6.8µF
1 SPX29302 4
2
3
GND
5
ADJ
VOUT
R1+ 10µF
R2
Figure 1. Fixed Output Linear Regulator
Figure 2. Adjustable Output Linear Regulator
Date: 5/25/04
SPX29300/01/02/03 3A Low Dropout Voltage Regulator
1
© Copyright 2004 Sipex Corporation
1 page  
The SPX29300/01/02/03 incorporates protec-
tion against over-current faults, reversed load
insertion, over temperature operation, and
positive and negative transient voltage.
Thermal Considerations
Although the SPX29300/01/02/03 offers
limiting circuitry for overload conditions, it is
still necessary to insure that the maximum
junction temperature is not exceeded in the
application. Heat will flow through the lowest
resistance path, the junction-to-case path. In
order to insure the best thermal flow of the
component, proper mounting is required.
TO-220 Design Example:
Assume that VIN = 10V, VOUT = 5V, IOUT =
1.5A, TA = 50°C, θHA= 1°C/W, θCH= 2°C/W,
and θJC= 3C°/W, where:
TA = ambient temperature,
θHA= heatsink to ambient thermal
resistance
θCH= case to heatsink thermal
resistance
θJC = junction to case thermal
resistance
The power calculated under these conditions
is:
PD = (VIN – VOUT) * IOUT = 7.5W.
And the junction temperature is calculated as
TJ = TA + PD * (θHA + θCH + θJC) or
TJ = 50 + 7.5 * (1+2+3) = 95°C
Reliable operation is insured.
Capacitor Requirements
The output capacitor is needed to insure
stability and minimize the output noise. The
value of the capacitor varies with the load.
However, a minimum value of 10µF alumi-
num capacitor will guarantee stability over all
load conditions. A tantalum capacitor is
recommended if a faster load transient
APPLICATION INFORMATION
response is needed. If the power source has a
high AC impedance, a 0.1µF ceramic capaci-
tor between input & ground is recommended.
Minimum Load Current
To ensure a proper behavior of the regulator
under light load, a minimum load of 5mA for
SPX29300/01/02/03 is required.
Adjustable Regulator Design
The SPX29302/03 are adjustable regulators
that can be programmed to any value between
1.25V and 16V using 2 resistors, R1 and R2.
The relationship between the resistors is:
R1 = R2(Vout/1.240-1).
Error Flag
The SPX29301/03 features an error flag that
indicates either an over current or under
voltage condition. The flag output goes low,
sinking 10mA when either condition occurs.
Enable Input
The SPX29301/02 have an Enable function
that switches the regulator on and off. Their
thresholds are TTL compatible. When the
regulator is active, approximately 20 uA flows
through the Enable pin.
Typical Application Circuits
Figure 1 represents at typical fixed output
regulator. Figure 2 represents an adjustable
output regulator. The values of R1 and R2 set
the output voltage value as follows:
V =V * [1 + (R1/R2)].
OUT REF
For best results, the total series resistance
should be small enough to pass a minimum
regulator load current of 5 mA. A minimum
value of 10kohms is recommended for R2
with a range between 10kohms and 47 kohms.
Date: 5/25/04
SPX29300/01/02/03 3A Low Dropout Voltage Regulator
5
© Copyright 2004 Sipex Corporation
5 Page 
PART NUMBER
SPX29301U5-1.8
SPX29301U5-2.5
SPX29301U5-3.3
SPX29301U5-5.0
SPX29301T5-1.8
SPX29301T5-1.8/TR
SPX29301T5-2.5
SPX29301T5-2.5/TR
SPX29301T5-3.3
SPX29301T5-3.3/TR
SPX29301T5-5.0
SPX29301T5-5.0/TR
SPX29302T5
SPX29302T5/TR
SPX29302U5
SPX29303T5
SPX29303T5/TR
SPX29303U5
ORDERING INFORMATION
ACCURACY OUTPUT VOLTAGE
1.0%
1.8V
1.0%
2.5V
1.0%
3.3V
1.0%
5.0V
1.0%
1.8V
1.0%
1.8V
1.0%
2.5V
1.0%
2.5V
1.0%
3.3V
1.0%
3.3V
1.0%
5.0V
1.0%
5.0V
1.0%
Adj
1.0%
Adj
1.0%
Adj
1.0%
Adj
1.0%
Adj
1.0%
Adj
PACKAGE
5 lead TO-220
5 lead TO-220
5 lead TO-220
5 lead TO-220
5 lead TO-263
5 lead TO-263
5 lead TO-263
5 lead TO-263
5 lead TO-263
5 lead TO-263
5 lead TO-263
5 lead TO-263
5 lead TO-263
5 lead TO-263
5 lead TO-220
5 lead TO-263
5 lead TO-263
5 lead TO-220
Available in lead free packaging. To order add "-L" suffix to part number.
Example: SPX29302T5/TR = standard; SPX29302T5-L-5.0/TR = lead free
/TR = Tape and Reel
Pack quantity is 500 for TO-263.
Corporation
ANALOG EXCELLENCE
Sipex Corporation
Headquarters
233 South Hillview Drive
Milpitas, CA 95035
TEL: (408) 934-7500
FAX: (408) 935-7600m
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: 5/25/04
SPX29300/01/02/03 3A Low Dropout Voltage Regulator
11
© Copyright 2004 Sipex Corporation
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet SPX29302.PDF ] | |
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