SPX29500T-L-1-8 [EXAR]
5A Low Dropout Voltage Regulator; 5A低压差稳压器
| 型号： | SPX29500T-L-1-8 |
| 厂家： | 
EXAR CORPORATION |
| 描述： | 5A Low Dropout Voltage Regulator |
| 文件： | 总9页 (文件大小：716K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SPX29501/02
5A Low Dropout Voltage Regulator
November 2008
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%
SPX29502
5 Pin TO-263
■ Fast Transient Response
■ Reverse-Battery Protection
■ Current Limit and Thermal Protection
1
2
3
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
Now Available in Lead Free Packaging
DESCRIPTION
TheSPX29501/02are5Ahighlyaccuratevoltageregulatorswithalowdropoutvoltageof420mV
@ 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
SPX29502
1
2
4
V
V
1
SPX29500
3
VOUT
OUT
V
IN
6.8µF
IN
+
+
5
3
22µF
2
+
+
R1
22µF
ADJ
6.8µF
GND
R2
Figure 1. Fixed Output Linear Regulator
Figure 2. Adjustable Output Linear Regulator
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
www.exar.com
Tel. +1 510 668-7000 – Fax. +1 510 668-7001
ABSOLUTE MAXIMUM RATINGS
Lead Temperature (soldering, 5 seconds) ................260°C
Storage Temperature Range........................-65°C to +150°C
Operating Junction Temperature Range......-40°C to +125°C
Input Voltage (Note 1) .................................................... 20V
OPERATING RATINGS
Input Voltage ................................................................... 16V
ELECTRICAL CHARACTERISTICS
Specifications are at VIN = VOUT + 1V and IOUT = 10mA, CIN = 6.8µF, COUT = 22µF, TA = 25°C, unless otherwise specified.
The ♦ denotes the specifications which apply over the full operating temperature range, unless otherwise specified.
PARAMETER
MIN
TYP
MAX
UNITS
CONDITIONS
Fixed Voltage Options
1.8V Version
SPX29501
Output Voltage
1.782
1.764
1.800
1.800
1.818
1.836
V
V
V
V
IOUT = 10mA
10mA ≤ IOUT ≤ 5A, 2.8V ≤ VIN ≤ 16V
♦
♦
♦
♦
2.5V Version
Output Voltage
2.475
2.450
2.500
2.500
2.525
2.550
IOUT = 10mA
10mA ≤ IOUT ≤ 5A, 3.5V ≤ VIN ≤ 16V
3.3V Version
Output Voltage
3.267
3.234
3.300
3.300
3.333
3.366
IOUT = 10mA
10mA ≤ IOUT ≤ 5A, 4.3V ≤ VIN ≤ 16V
5.0V Version
Output Voltage
4.950
4.900
5.000
5.000
5.050
5.100
IOUT = 10mA
10mA ≤ IOUT ≤ 5A, 6.0V ≤ VIN ≤ 16V
All Voltage Options
Line Regulation
Load Regulation
∆V/∆T
SPX29501/02
0.06
0.2
20
0.5
1
%
%
IOUT=10mA,(VOUT+1V) ≤ VIN ≤ 16V
VIN=VOUT+2V, 10mA≤ IOUT ≤ IFL (Note 2)
VOUT Temp Coefficient (Note 5)
100
250
ppm/°C
mV
♦
♦
Dropout Voltage, except
1.8V
90
250
420
IOUT=250mA
IOUT=2.5A
IOUT=5A
800
♦
♦
Ground Current
(Note 4)
20
70
50
mA
mA
IOUT=2.5A
IOUT=5A
Ground Pin Current
at Dropout
3
VIN=0.5V less than specified VOUT,
IOUT=10mA
Current Limit
7.5
10
A
♦
(Note 3)
Output Noise Voltage
(10Hz to 100kHz)
IL=100mA
425
µVRMS
CL=22µF
350
CL=33µF
Reference Voltage
1.228
1.215
1.240
1.252
1.265
V
Adjustable version only
♦
♦
Reference Voltage
1.203
1.277
V
Adjustable version only (Note 7)
(Note 6)
Adjust Pin Bias Current
40
20
80
120
nA
Reference Voltage
Temp. Coeff.
ppm/°C
nA/°C
Adjust Pin Bias
0.1
Current Temp. Coeff.
Rev:B Nov 2008
SPX29500/01/02/03 5A Low Dropout Voltage Regulator
© Copyright 2008 Exar Corporation
2
ELECTRICAL CHARACTERISTICS: Continued
Specifications are at VIN = VOUT + 1V and IOUT = 10mA, CIN = 6.8µF, COUT = 22µF, TA = 25°C, unless otherwise specified.
The ♦ denotes the specifications which apply over the full operating temperature range, unless otherwise specified.
PARAMETER
MIN
TYP
SPX29501
0.01
MAX
UNITS
CONDITIONS
Flag Output (Error Comparator)
Output Leakage
Current
1
2
µA
mV
mV
mV
mV
VOH=16V
♦
♦
♦
♦
Output Low Voltage
220
60
300
400
Device set for 5V,VIN=4.5V, IOL=250µA
Device set for 5V, (Note 8)
Device set for 5V, (Note 8)
Device set for 5V, (Note 8)
Upper Threshold
Voltage
40
25
Lower Threshold
Voltage
75
95
140
Hysteresis
15
Enable Input
SPX29501/02
Input Logic Voltage
Low (OFF)
0.8
V
(Note 10)
High (ON)
2.4
ENABLE Input Current
100
0.6
600
750
2
µA
µA
VEN=16V
VEN=0.8V
♦
♦
4
Regulator Output
10
µA
(Note 9)
Current in Shutdown
500
♦
Thermal Resistance
2
60
2
°C/W
TO-220 Junction to Case, at Tab
TO-220 Junction to Ambient
TO-263 Junction to Case, at Tab
TO-263 Junction to Ambient
60
NOTES:
Note 1: Maximum positive supply voltage of 20V must be of limited duration (<100ms) and duty cycle of less than 1%. The
maximum continuous supply voltage is 16V.
Note 2: Full load current (IFL) is defined as 5A.
Note 3: VIN = VOUT (NOMINAL) +1V. For example, use VIN = 4.3V for a 3.3V regulator. Employ pulse-testing procedures to minimize
temperature rise.
Note 4 Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum of the load current
plus the ground pin current.
Note 5: Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.
Note 6: Thermal regulation is defined as the change in output voltage at time T after a change in power dissipation is applied,
excluding load / line regulation effects. Specifications for a 200mA load pulse as VIN = 20V (a 4W pulse) for t = 10ms.
Note 7: VREF≤ VOUT ≤ (VIN-1), 2.3V≤VIN ≤ 16V, 10mA ≤ IL ≤ IFL, Tj < Tjmax
.
Note 8: Comparator threshold is expressed in terms of a voltage differential at the Adjust terminal below the nominal reference
voltage measured 6V input. To express these thresholds in terms of output voltage change, multiply the error amplifier gain =
V
OUT/VREF = (R1 + R2)/R2. For example, at a programmable output voltage of 5V, the Error output is guaranteed to go low when
the output drops by 95mVx 5V/ 1.240V = 383mV. Threshold remain constant as a percent of VOUT as VOUT is varied, with the
dropout warning occurring at typically 5% below nominal, 7.7% guaranteed.
Note 9: VEN ≤ 0.4V and VIN ≤ 16V, VOUT = 0.
Note 10: Measured with IOUT = IOUT MIN (10mA).
Rev:B Nov 2008
SPX29500/01/02/03 5A Low Dropout Voltage Regulator
© Copyright 2008 Exar Corporation
3
FUNCTIONAL DIAGRAM
IN
OUT
O.V
ILIMIT
1.180V
FLAG
1.240V
20V
R1*
Reference
+
-
+
-
ADJ
EN
Thermal
Shutdown
R2*
GND
TYPICAL PERFORMANCE CHARACTERISTICS
600
550
500
450
400
350
300
250
200
150
100
50
120
110
100
90
80
70
60
50
40
30
20
10
0
0
1
2
3
4
5
0
1
2
3
4
5
6
Output Current (A)
Output Current (A)
Figure 3. Ground Current (mA) vs. Output Current (A)
Figure 4. Dropout (mV) vs. Output Current (A)
VOUT (AC)
VOUT (AC)
IOUT (2A/DIV)
VIN
Figure 5. Load Transient (VIN=4V, VO=3.3V, COUT=22µF,
Figure 6. Line Transient (COUT=22µF, IO=10mA)
10mA~5A)
Rev:B Nov 2008
SPX29500/01/02/03 5A Low Dropout Voltage Regulator
© Copyright 2008 Exar Corporation
4
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.
The SPX29501/02 incorporates protection
against over-current faults, reversed load
insertion, over temperature operation, and
positive and negative transient voltage.
Thermal Considerations
Minimum Load Current
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,thejunction-to-casepath. Inordertoinsure
the best thermal flow of the component, proper
mounting is required.
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:
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:
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.
TA = ambient temperature,
θHA= heatsink to ambient thermal
resistance
θCH= case to heatsink thermal
resistance
Enable Input
θJC = junction to case thermal
resistance
The SPX29501/02 have an Enable function that
switches the regulator on and off. Their thresh-
oldsareTTLcompatible. Enablingtheregulator
requires approximately 20µA of current.
The power calculated under these conditions is:
PD = (VIN – VOUT) * IOUT = 15W.
Typical Application Circuits
And the junction temperature is calculated as
TJ = TA + PD * (θHA + θCH + θJC) or
TJ = 50 + 15 * (1+2+2) = 125°C
Figure 1 represents at typical fixed output regu-
lator. Figure 2 represents an adjustable output
regulator. ThevaluesofR1andR2settheoutput
voltage value as follows:
Reliable operation is insured.
VOUT =VREF * [1 + (R1/R2)].
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
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
© Copyright 2008 Exar Corporation
5
PACKAGES
TO-263-5 Package (T5)
SPX29501
1)ENABLE
2)INPUT
SPX29502
1) ENABLE
2) INPUT
1
2
3 4 5
GND
3)GND
3)
4) OUTPUT
5)
4)OUTPUT
5)
ADJUST
FLAG
Top View
TO-220-5 Package (U5)
SPX29501
1)ENABLE
2)INPUT
SPX29502
1)
2)
3)
4)
5)
ENABLE
INPUT
GND
OUTPUT
3)
4)
5)
GND
OUTPUT
FLAG
ADJUST
1 2 3 4 5
Top View
*Tab is internally connected to GND
Rev:B Nov 2008
SPX29500/01/02/03 5A Low Dropout Voltage Regulator
© Copyright 2008 Exar Corporation
6
PACKAGES: 5 PIN TO-263
Rev:B Nov 2008
SPX29500/01/02/03 5A Low Dropout Voltage Regulator
© Copyright 2008 Exar Corporation
7
PACKAGES: 5 PIN TO-220
Rev:B Nov 2008
SPX29500/01/02/03 5A Low Dropout Voltage Regulator
© Copyright 2008 Exar Corporation
8
ORDERING INFORMATION
PART NUMBER
ACCURACY
OUTPUT VOLTAGE
PACKAGE
SPX29500U-L-1-8 ...................EOL
SPX29500U-L-2-5 ...................EOL
SPX29500U-L-3-3 ...................EOL
SPX29500U-L-5-0 ...................EOL
SPX29500T-L-1-8 ...................EOL
SPX29500T-L-2-5 ...................EOL
SPX29500T-L-3-3 ...................EOL
SPX29500T-L-5-0 ...................EOL
SPX29501U5-L-1-8 .................EOL
SPX29501U5-L-2-5 .................EOL
SPX29501U5-L-3-3 .................EOL
SPX29501U5-L-5-0 .................EOL
SPX29501T5-L-1-8 ................. 1.0% ................................... 1.8V ............................ 5 lead TO-263
SPX29501T5-L-2-5 ................. 1.0% ................................... 2.5V ............................ 5 lead TO-263
SPX29501T5-L-3-3 ................. 1.0% ................................... 3.3V ............................ 5 lead TO-263
SPX29501T5-L-5-0 ................. 1.0% ................................... 5.0V ............................ 5 lead TO-263
SPX29502T5-L ........................ 1.0% .................................... Adj.............................. 5 lead TO-263
SPX29502U5-L ....................... 1.0% .................................... Adj.............................. 5 lead TO-220
SPX29503T5-L ........................EOL
SPX29503U5-L .......................EOL
Please consult the factory for pricing and availability on a Tape-On-Reel option.
FOR FURTHER ASSISTANCE
Email:
customersupport@exar.com
Exar Technical Documentation:
http://www.exar.com/TechDoc/default.aspx?
EXAR CORPORATION
HEADQUARTERS AND SALES OFFICES
48720 Kato Road
Fremont, CA 94538 – USA
Tel.: +1 (510) 668-7000
Fax: +1 (510) 668-7030
www.exar.com
NOTICE
EXAR Corporation reserves the right to make changes to the products contained in this publication in order to improve
design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any circuits described herein,
conveys no license under any patent or other right, and makes no representation that the circuits are free of patent
infringement. Charts and schedules contained here in are only for illustration purposes and may vary depending upon a
user’s specific application. While the information in this publication has been carefully checked; no responsibility, however,
is assumed for inaccuracies.
EXAR Corporation does not recommend the use of any of its products in life support applications where the failure or
malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its
safety or effectiveness. Products are not authorized for use in such applications unless EXAR Corporation receives, in
writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user assumes all
such risks; (c) potential liability of EXAR Corporation is adequately protected under the circumstances.
Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited.
Rev:B Nov 2008
SPX29500/01/02/03 5A Low Dropout Voltage Regulator
© Copyright 2008 Exar Corporation
9
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