SPX1587R-2.5 [SIPEX]
3A Low Dropout Voltage Regulator Adjustable & Fixed Output, Fast Response; 3A低压差稳压器可调节和固定输出,响应速度快型号: | SPX1587R-2.5 |
厂家: | SIPEX CORPORATION |
描述: | 3A Low Dropout Voltage Regulator Adjustable & Fixed Output, Fast Response |
文件: | 总7页 (文件大小:190K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
SPX1587
3A Low Dropout Voltage Regulator
Adjustable & Fixed Output,
Fast Response
FEATURES
APPLICATIONS
• Adjustable Output Down To 1.2V
• Fixed Output Voltages 1.5, 2.5, 3.3, 5.0V
• Output Current Of 3A
• Powering VGA & Sound Card
• Power PC Supplies
• SMPS Post-Regulator
• Low Dropout Voltage 1.1V Typ.
• Extremely Tight Load And Line Regulation
• Current & Thermal Limiting
• High Efficiency “Green” Computer Systems
• High Efficiency Linear Power Supplies
• Portable Instrumentation
• Standard 3-Terminal Low Cost TO-220, TO-263 & TO-252
• Similar To Industry Standard LT1085/LT1585
• Constant Current Regulators
• Adjustable Power Supplies
• Battery charger
PRODUCT DESCRIPTION
The SPX1587 is a low power 3A adjustable and fixed voltage regulator that is very easy to use. It requires only 2 external resistors to
set the output voltage for adjustable version. The SPX1587 are designed for low voltage applications that offers lower dropout voltage
and faster transient response. This device is an excellent choice for use in powering low voltage microprocessor that require a lower
dropout, faster transient response to regulate from +2.5V to 3.8V supplies and as a post regulator for switching supplies applications.
The SPX1587 features low dropout of a maximum 1.2 volts.
The SPX1587 offers over current limit and full protection against reversed input polarity, reversed load insertion, 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 SPX1587 are offered in a 3-pin TO-220, TO-263 & TO-252 packages compatible with other 3 terminal regulators. For a 5A low
dropout regulator refer to the SPX1585 data sheet.
PIN CONNECTIONS
TO-263-3 (T)
TO-220-3 (U)
TO-252 (R)
SPX1587
SPX1587
SPX1587
2
1
3
1
3
2
1
2
3
ADJ/GND VOUT VIN
VIN
Front View
ADJ/GND
VOUT
Top View
VIN
V
ADJ/GND
OUT
Front View
Rev. 10/30/00
SPX1587
ABSOLUTE MAXIMUM RATINGS
Lead Temp. (Soldering, 10 Seconds) .............................. 300°C
Storage Temperature Range ............................-65° to +150°C
Operating Junction Temperature Range ......................
SPX1587 Control Section.......................... -45°C +125°C
SPX1587 Power Transistor.........................-45°C +150°C
Maximum Input Voltage ...................................... 10V
Input to Output Voltage Differential Max........... 8.8V
ELECTRICAL CHARACTERISTICS (NOTE 1) at IOUT = 10mA, T =25 C, unless otherwise specified.
°
A
SPX1587A
SPX1587
PARAMETER
CONDITIONS
Typ
Units
Min
Max
Min
Max
1.5V Version
Output Voltage (Note 2)
1.5
1.5
1.485
1.470
1.515
1.530
1.470
1.455
1.530
1.545
V
SPX1587-1.5V, 0 ≤IOUT≤3A, 2.75V≤VIN ≤10V
2.5V Version
Output Voltage (Note 2)
2.5
2.5
2.475
2.450
2.525
2.550
2.450
2.425
2.550
2.575
V
SPX1587-2.5V, 0 ≤IOUT≤3A, 4.0V≤VIN ≤10V
3.3V Version
Output Voltage (Note 2)
3.3
3.3
3.270
3.240
3.330
3.360
3.230
3.201
3.370
3.399
V
V
V
SPX1587-3.3V, 0 ≤IOUT≤3A, 4.75V≤VIN ≤10V
SPX1587-5.0V, 0 ≤IOUT≤3A, 6.5V≤VIN ≤10V
VIN≤ 7V, P≤ PMAX
5.0V Version
Output Voltage (Note 2)
5.0
5.0
4.95
4.90
5.05
5.10
4.900
4.850
5.100
5.150
All Voltage Options
Reference Voltage (VREF
)
1.238
1.225
1.263
1.270
1.225
1.212
1.270
1.288
1.250
1.5V≤ (VIN -VOUT)≤(VIN-VOUT
10mA≤IOUT≤3A
)
,
MAX
Min. Load Current (Note 3)
Line Regulation (∆VREF (VIN)) 2.75V≤VIN ≤7V, IOUT=10mA, TJ=25°C
5
10
0.2
10
0.2
mA
%
1.5V≤ (VIN -VOUT)≤ (VIN-VOUT
)
MAX
0.005
(Note 3)
0.005
0.05
0.05
1.1
0.2
0.3
0.3
1.2
0.2
0.3
0.3
1.2
%
%
V
IN ≤7V, IOUT=0mA, TJ=25°C
(Note 2)
Load Regulation (∆VREF
10mA≤IOUT ≤3A, (VIN-VOUT)=3V, TJ=25°C
(IOUT))
(Note 3)
%
0≤IOUT ≤3A, VIN=7V, TJ=25°C
(Note 2)
Dropout Voltage
Current Limit
V
∆VREF=1%
IOUT =3A
OUT≤3A
I
VIN=7V
1.4V≤ (VIN- VOUT) (Note3)
TA=125°C, 1000 Hrs.
A
IOUT
(
)
4.0
0.3
3.2
3.2
MAX
Long Term Stability
1
1
%
(Note 2)
0.01
Thermal Regulation
(∆VOUT (Pwr))
0.020
0.020
%/W
%
TA=25°C, 20 ms pulse
Temperature Stability
(∆VOUT (T))
0.25
Output Noise, RMS
Thermal Resistance
0.003
%V
°C/W
10Hz to 10kHz TA = 25°c
TO-220
Junction to Tab
3.0
60
3.0
60
Junction to Ambient
Junction to Tab
DD Package
3.0
60
3.0
60
Junction to Ambient
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: Fixed Version Only
Note 3: Adjustable Version Only
Rev. 10/30/00
SPX1587
APPLICATION HINTS
Reducing parasitic resistance and inductance
The SPX1587 incorporates protection against over-current
faults, reversed load insertion, over temperature operation, and
positive and negative transient voltage. However, the use of
an output capacitor is required in order to improve the stability
and the performances.
One solution to minimize parasitic resistance and inductance is
to connect in parallel capacitors. This arrangement will
improve the transient response of the power supply if your
system requires rapidly changing current load condition.
Thermal Consideration
Stability
Although the SPX1587 offers some limiting circuitry for
overload conditions, it is necessary not to exceed the
maximum junction temperature, and therefore to be careful
about thermal resistance. The heat flow will follow the lowest
resistance path, which is the Junction-to-case thermal
resistance. In order to insure the best thermal flow of the
component, a proper mounting is required. Note that the case
of the device is electrically connected to the output. In case
the case has to be electrically isolated, a thermally conductive
spacer can be used. However do not forget to consider its
contribution to thermal resistance.
The output capacitor is part of the regulator’s frequency
compensation system. Either a 22µF aluminum electrolytic
capacitor or a 10µF solid tantalum capacitor between the
output terminal and ground guarantees stable operation for all
operating conditions.
However, in order to minimize overshoot and undershoot, and
therefore optimize the design, please refer to the section
‘Ripple Rejection’.
Ripple Rejection
Ripple rejection can be improved by adding a capacitor
between the ADJ pin and ground as shown in figure 6. When
ADJ pin bypassing is used, the value of the output capacitor
required increases to its maximum (22µF for an aluminum
electrolytic capacitor, or 10µF for a solid tantalum capacitor).
If the ADJ pin is not bypass, the value of the output capacitor
can be lowered to 10µF for an electrolytic aluminum capacitor
or 4.7µF for a solid tantalum capacitor.
Assuming:
V
IN = 10V, VOUT = 5V, IOUT = 1.5A, TA = 50°C/W,
θ Heatsink Case = 6°C/W, θ Heatsink Case = 0.5°C/W, θ JC = 3°C/W
Power dissipation under this condition
PD = (VIN – VOUT) * IOUT = 7.5W
Junction Temperature
TJ = TA + PD * (θ Case - HS+ θ HS + θ JC
However the value of the ADJ-bypass capacitor should be
chosen with respect to the following equation:
)
C = 1 / (6.28 * FR * R1)
For the Control Sections
TJ = 50 + 7.5*(0.5 +6=3) = 121.25°C
Where C
= value of the capacitor in Farads (select an
121.25°C < TJ (max) for the Control & Power Sections.
equal or larger standard value),
FR = ripple frequency in Hz,
R1 = value of resistor R1 in Ohms.
In both case reliable operation is insured by adequate junction
temperature.
If an ADJ-bypass capacitor is use, the amplitude of the output
ripple will be independent of the output voltage. If an ADJ-
bypass capacitor is not used, the output ripple will be
proportional to the ratio of the output voltage to the reference
voltage:
M = VOUT / VREF
Where M = multiplier for the ripple seen when the ADJ pin
is optimally bypassed.
V
REF = Reference Voltage
Rev. 10/30/00
SPX1587
Basic Adjustable Regulator
VIN
5V
VOUT
3.3V
VIN
VOUT
SPX1587
SPX1587
C2
10uF
R1
R2
VREF
C1
10uF
IADJ
50µA
Basic Fixed Regulator
VOUT = VREF * ( 1 + R/R1) + IADJ * R2
2
Fig.2 Basic Adjustable Regulator
Output Voltage
Output Voltage
The fixed voltage LDO voltage regulators are simple to use
regulators since the VOUT is preset to the specifications. It is
important however, to provide the proper output capacitance
for stability and improvement. For most operating conditions
a capacitance of 22uF tantalum or 100uF electrolytic will
ensure stability and prevent oscillation.
Consider Figure 2. The resistance R1 generates a constant
current flow, normally the specified load current of 10mA.
This current will go through the resistance R2 to set the overall
output voltage. The current IADJ is very small and constant.
Therefore its contribution to the overall output voltage is very
small and can generally be ignored.
Load Regulation
Parasitic line resistance can degrade load regulation. In order
not to affect the behavior of the regulator, it is best to connect
directly the R1 resistance from the resistor divider to the case,
and not to the load. For the same reason, it is best to connect
the resistor R2 to the Negative side of the load.
R
Parasitic Line
RPesistance
VIN
SPX1587
Connect R to
1
Case of Regulator
R1
RL
R2
Connect Rto Load
2
Fig.3 Basic Adjustable Regulator
Rev. 10/30/00
SPX1587
TYPICAL APPLICATIONS
VIN
VOUT
VIN
OUT
IN
SPX1587
OUT
IN
SPX1587
C2
C1
C1
R1
R2
ADJ
R1
ADJ
VOUT = VREF (1 + R ) + IADJ R2
R21
LOAD
Fig. 5 Typical Adjustable Regulator
Fig. 4 3A Current output Regulator
(Note A)
VIN
5V
VIN
(Note A)
IN
SPX1587 OUT
ADJ
5V
IN
OUT
VOUT
SPX1587
+
10µF
121Ω
ADJ
R1
1%
+
121Ω
+
10µF
1k
1%
100µF
TTL
Input
150µF
2N3904
1k
XC
*C1 improves ripple rejection.
should be ~ R 1 at ripple frequency.
365Ω
R2
365Ω
1%
1%
+
C1
10µF*
Note A: VIN(MIN)= (Intended VOUT) + (VDROPOUT (MAX)
)
Note A: VIN(MIN)= (Intended VOUT) + (VDROPOUT (MAX)
)
Fig. 6 Improving Ripple Rejection
Fig.7 5V Regulator with Shutdown
Rev. 10/30/00
SPX1587
TYPICAL CHARACTERISTICS
Rev. 10/30/00
SPX1587
ORDERING INFORMATION
Ordering No.
SPX1587T
Precision
2%
2%
2%
2%
2%
1%
1%
1%
1%
1%
2%
2%
2%
2%
2%
1%
1%
1%
1%
1%
2%
2%
2%
2%
2%
1%
1%
1%
1%
1%
Output Voltage
Adj
Packages
3 Lead TO-263
3 Lead TO-263
3 Lead TO-263
3 Lead TO-263
3 Lead TO-263
3 Lead TO-263
3 Lead TO-263
3 Lead TO-263
3 Lead TO-263
3 Lead TO-263
3 Lead TO-220
3 Lead TO-220
3 Lead TO-220
3 Lead TO-220
3 Lead TO-220
3 Lead TO-220
3 Lead TO-220
3 Lead TO-220
3 Lead TO-220
3 Lead TO-220
3 Lead TO-252
3 Lead TO-252
3 Lead TO-252
3 Lead TO-252
3 Lead TO-252
3 Lead TO-252
3 Lead TO-252
3 Lead TO-252
3 Lead TO-252
3 Lead TO-252
1.5V
2.5V
3.3V
5.0V
Adj
SPX1587T-1.5
SPX1587T-2.5
SPX1587T-3.3
SPX1587T-5.0
SPX1587AT
1.5V
2.5V
3.3V
5.0V
Adj
SPX1587AT-1.5
SPX1587AT-2.5
SPX1587AT-3.3
SPX1587AT-5.0
SPX1587U
1.5V
2.5V
3.3V
5.0V
Adj
SPX1587U-1.5
SPX1587U-2.5
SPX1587U-3.3
SPX1587U-5.0
SPX1587AU
1.5V
2.5V
3.3V
5.0V
Adj
SPX1587AU-1.5
SPX1587AU-2.5
SPX1587AU-3.3
SPX1587AU-5.0
SPX1587R
1.5V
2.5V
3.3V
5.0V
Adj
SPX1587R-1.5
SPX1587R-2.5
SPX1587R-3.3
SPX1587R-5.0
SPX1587AR
1.5V
2.5V
3.3V
5.0V
SPX1587AR-1.5
SPX1587AR-2.5
SPX1587AR-3.3
SPX1587AR-5.0
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 license under its patent rights nor the rights of others.
Rev. 10/30/00
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