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PDF SPX29501 Data sheet ( Hoja de datos )
| Número de pieza | SPX29501 | |
| Descripción | 5A Low Dropout Voltage Regulator | |
| Fabricantes | Exar | |
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November 2008
®
5
A
P SPX29501/02
5A Low Dropout Voltage Regulator
Rev. B
FEATURES
■ Adjustable Output Down to 1.25V
■ 1% Output Accuracy
■ Output Current of 5A
■ Low Dropout Voltage: 420mV @ 5A
■ Tight Line Regulation: 0.06%
■ Load Regulation: 0.2%
■ Fast Transient Response
■ Reverse-Battery Protection
■ Current Limit and Thermal Protection
SPX29502
5 Pin TO-263
1 23
SP29500
3 Pin TO-220
1 23
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
VIN GND VOUT
Now Available in Lead Free Packaging
DESCRIPTION
The SPX29501/02 are 5A highly accurate voltage regulators with a low dropout voltage of 420mV
@ 5A. 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 include Enable, and Error Flag.
The SPX295001/02 are offered in 5-pin TO-220 & TO-263 packages. For a 1.5A version, refer
to the SPX29150 data sheet. For a 3A version, refer to the SPX29300 datasheet.
TYPICAL APPLICATION CIRCUITS
VIN
+
6.8µF
1 SPX29500 3
2
VOUT
+ 22µF
VIN
+
6.8µF
1 SPX29502 4
2
3
GND
5
ADJ
VOUT
R1+ 22µF
R2
Figure 1. Fixed Output Linear Regulator
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
Figure 2. Adjustable Output Linear Regulator
www.exar.com
Tel. +1 510 668-7000 – Fax. +1 510 668-7001
1 page  
The SPX29501/02 incorporates protection
against over-current faults, reversed load
insertion, over temperature operation, and
positive and negative transient voltage.
Thermal Considerations
Although the SPX29501/02 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 = 8V, VOUT = 5V, IOUT = 5A, TA
= 50°C, θHA= 1°C/W, θCH= 2°C/W, and θJC=
2°C/W, where:
T = ambient temperature,
A
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 = 15W.
And the junction temperature is calculated as
TJ = TA + PD * (θHA + θCH + θJC) or
T
J
=
50
+
15
*
(1+2+2)
=
125°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 22µF aluminum capacitor
will guarantee stability over all load conditions.
A tantalum capacitor is recommended if a faster
APPLICATION INFORMATION
load transient response is needed. If the power
source has a high AC impedance, a 0.1µF ce-
ramic capacitor between input & ground is rec-
ommended.
Minimum Load Current
To ensure a proper behavior of the regulator
under light load, a minimum load of 10mA for
SPX29501/02 is required.
Adjustable Regulator Design
The SPX29502 is an adjustable regulator that
can be programmed to any value between 1.24V
and 16V using 2 resistors, R1 and R2. The
relationship between the resistors is:
R1 = R2(VOUT/1.24-1).
Error Flag
The SPX29501 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 SPX29501/02 have an Enable function that
switches the regulator on and off. Their thresh-
olds are TTL compatible. Enabling the regulator
requires approximately 20µA of current.
Typical Application Circuits
Figure 1 represents at typical fixed output regu-
lator. 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
guarantee a minimum regulator load current of
10mA.
Rev:B Nov 2008
SPX29500/01/02/03 5A Low Dropout Voltage Regulator
5
© Copyright 2008 Exar Corporation
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet SPX29501.PDF ] | |
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