Page 1
®
SPX1587
3A Low Dropout Voltage Regulator
FEATURES
■ Guaranteed 3A Output Current
■ Three Terminal Adjustable or Fixed
1.5V, 1.8V, 2.5V, 3.3V and 5.0V
■ Low Quiescent Current
■ Low Dropout Voltage: 1.1V at 3A
■ Line Regulation: 0.1%
■ Load Regulation: 0.1%
■ Stable with 10uF Ceramic Capacitor
■ Overcurrent and Thermal Protection
■ Available Packages: TO-252,
TO-220, and TO-263
■ Similar to Industry Standard LT1085/
LT1585
APPLICATIONS
■ Desktop PC's Servers
■ Powering VGA and Sound Cards
■ Cordless Phones
■ Battery Chargers
■ Adjustable Power Supplies
■ Portable Instrumentation
■ SMPS Post-Regulator
The SPX1587 is a low power positive-voltage regulator designed to satisfy moderate power requirements
with a cost effective, small footprint solution. This device is an excellent choice for use in battery-powered
applications and portable computers. The SPX1587 features very low quiescent current and a low dropout
voltage of 1.1V at a full load. As output current decreases, quiescent current flows into the load, increasing
efficiency. SPX1587 is available in adjustable or fixed 1.5V, 1.8V, 2.5V, 3.3V and 5.0V output voltages.
The SPX1587 is offered in several 3-pin surface mount packages: TO-252, TO-220 and TO-263. An output
capacitor of 10µF ceramic or tantalum provides unconditional stability.
SPX1587
3 Pin TO-263
123
ADJ/GND
V
OUT
V
IN
3 Pin TO-220
ADJ/GND
SPX1587
V
OUTVIN
321
Now Available in Lead Free Packaging
DESCRIPTION
FUNCTIONAL DIAGRAM (Adjustable)
V
IN
Current Limit
Thermal Limit
I
TL
Date: 5/25/04 SPX1587 3A Low Dropout Voltage Regulator © Copyright 2004 Sipex Corporation
+
-
V
ADJ/GND
~
I
ADJ
OUT
–
50µA
I
CL
+
–
AMP
_
+
1.25V
V
REF
1
Page 2
ABSOLUTE MAXIMUM RATINGS
Power Dissipation.......................................Internally Limited
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 Supply Voltage .................................................... +10V
Input to Output Voltage ................................................ +8.8V
ESD Rating .............................................................. 2kV min
ELECTRICAL CHARACTERISTICS
Specifications are at VIN=V
the specifications which apply full operating temperature range -40°C to +85°C, unless otherwise specified.
PARAMETER MIN TYP MAX MIN TYP MAX UNITS CONDITIONS
1.5V Version SPX1587A SPX1587
Output Voltage 1.485 1.500 1.515 1.470 1.500 1.530 V I
1.8V Version
Output Voltage 1.782 1.800 1.818 1.764 1.800 1.836 V I
2.5V Version
Output Voltage 2.475 2.500 2.525 2.450 2.500 2.550 V I
3.3V Version
Output Voltage 3.267 3.300 3.333 3.234 3.300 3.366 V I
5.0V Version
Output Voltage 4.950 5.000 5.050 4.900 5.000 5.100 V I
All Voltage Options
Reference Voltage 1.238 1.250 1.262 1.225 1.250 1.275 V I
Output Voltage 0.3 0.5 %
Temperature Stability
Line Regulation 0.1 0.2 0.1 0.2 % 3.0V≤VIN≤ 10V,V
Load Regulation 0.1 0.3 0.1 0.3 % 10mA≤I
Dropout Voltage 1.00 1.00 V I
(Note 2) 1.05 1.05 I
Minimum Load Current 4 10 4 10 mA
(Note 4)
Quiescent Current 4 10 4 10 mA Fixed voltage versions
Adjust Pin Current 50 50 µA
Current Limit 3.2 5 3.2 5 A (VIN-V
Thermal Regulation 0.01 0.1 0.01 0.1 %/W 25°C, 30mS pulse
Ripple Rejection 60 75 60 75 dB F
Long Term Stability 0.03 0.03 % 125°C, 1000Hrs
RMS Output Noise 0.003 0.003 % % of V
Thermal Resistance 3 3 °C/W TO-220 Junction to Case, at Tab
Date: 5/25/04 SPX1587 3A Low Dropout Voltage Regulator © Copyright 2004 Sipex Corporation
+ 1.5V, TA = 25°C, CIN = C
OUT
= 10µF, I
OUT
1.470 1.530 1.455 1.545
1.764 1.836 1.746 1.854
2.450 2.550 2.425 2.575
3.234 3.366 3.201 3.399
4.900 5.100 4.850 5.150
1.225 1.275 1.212 1.287
0.1 0.2 0.1 0.2 3.3V≤VIN≤ 10V,V
0.1 0.2 0.1 0.2 4.25V≤VIN≤ 10V,V
0.1 0.2 0.1 0.2 4.75V≤VIN≤ 10V,V
0.1 0.2 0.1 0.2 6.50V≤VIN≤ 10V,V
0.1 0.3 0.1 0.3 10mA≤I
0.1 0.3 0.1 0.3 10mA≤I
0.1 0.3 0.1 0.3 10mA≤I
0.1 0.3 0.1 0.3 10mA≤I
1.10 1.2 1.10 1.2 I
120 120
60 60 TO-220 Junction to Ambient
33 TO-263 Junction to Case, at Tab
60 60 TO-263 Junction to Ambient
66 TO-252 Junction to Case, at Tab
126 126 TO-252 Junction to Ambient
=10mA, unless otherwise specified. The ♦ denotes
OUT
= 10mA, VIN =3.5V
OUT
♦
♦
♦
♦
♦
♦
10mA ≤ I
OUT
10mA ≤ I
OUT
10mA ≤ I
OUT
10mA ≤ I
OUT
10mA ≤ I
OUT
10mA≤I
OUT
OUT
OUT
≤ 3A, 3.0V ≤ V
OUT
= 10mA, VIN =3.8V
≤ 3A, 3.3V ≤ V
OUT
= 10mA, VIN =4.5V
≤ 3A, 4.25V ≤ V
OUT
= 10mA, VIN =5V
≤ 3A, 4.75V ≤ V
OUT
=10mA, VIN=7V
≤ 3A, 6.50V ≤ V
OUT
=10mA, (V
- V
IN
OUT
≤ 3A, 1.5V≤(VIN-V
OUT
OUT
OUT
OUT
OUT
OUT
≤ 3A, V
OUT
OUT
≤ 3A, V
OUT
OUT
≤ 3A, V
OUT
OUT
≤ 3A, V
OUT
OUT
≤ 3A, V
OUT
OUT
=1.5V
=1.8V
=1A
=2A
=3A
)= 2V
=2.5V
=3.3V
=5.0V
=1.5V
=1.8V
=2.5V
=3.3V
=5.0V
IN
IN
IN
IN
IN
OUT
≤ 10V
≤ 10V
≤ 10V
≤ 10V
≤ 10V
♦
)=2V
OUT
RIPPLE
V
RIPPLE
=120Hz, (VIN-V
=1V
PP
, 10Hz≤f≤10kHz
OUT
OUT
)=2V,
)≤ 10V
2
Page 3
ELECTRICAL CHARACTERISTICS: Continued (Notes)
NOTES:
Note 1: Output temperature coefficient is defined as the worst case voltage change divided by the total temperature range
Note 2: Dropout voltage is defined as the input to output differential at which the output voltage drops 100mV below its nominal value
measured at 1V differential at very low values of programmed output voltage, the minimum input supply voltage of 2V ( 2.3V
over temperature) must be taken into account.
Note 3: Thermal regulation is defined as the change in output voltage at a time T after a change in power dissipation is applied. excluding
load or line regulation effect.
Note 4: Adjustable Version Only.
TYPICAL PERFORMANCE CHARACTERISTICS
3.325
3.320
3.315
Vout (V)
3.310
3.305
3.300
4.5 6.5 8.5 10.5 12.5 14.5
Vin (V)
Figure 1. Line Regulation for SPX1587U-3.3; I
2.55
2.54
2.53
2.52
2.51
2.5
Vout (V)
2.49
2.48
2.47
2.46
2.45
-50 -30 -10 10 30 50 70 90 110 130
Temp (°C)
2.5v Adj
2.5v Fixed
OUT
=10mA
1.275
1.27
1.265
1.26
1.255
1.25
Vou t (V)
1.245
1.24
1.235
1.23
1.225
-50 -30 -10 10 30 50 70 90 110 130
Figure 2. V
Vout (V)
vs Temperature, VIN=2.5V, I
OUT
3.38
3.36
3.34
3.32
3.3
3.28
3.26
-50 -30 -10 10 30 50 70 90 110 130
Temp (C)
Temp (C)
1.25v Adj
=10mA
OUT
3.3v Adj
3.3v Fixed
Figure 3. VIN=4.0V, I
Date: 5/25/04 SPX1587 3A Low Dropout Voltage Regulator © Copyright 2004 Sipex Corporation
OUT
=10mA
Figure 4. VIN=5.0V, I
OUT
=10mA
3
Page 4
APPLICATION INFORMATION
Output Capacitor
To ensure the stability of the SPX1587, an output
capacitor of at least 10µF (ceramic or tantalum) or
22µF (aluminum) is required. The value may change
based on the application requirements of the output
load or temperature range. The value of ESR can vary
based on the type of capacitor used in the applications to guarantee stability. The recommended value
for ESR is 0.5Ω or less. A larger value of output
capacitance (up to 100µF) can improve the load
transient response.
Soldering Methods
The SPX1587 die is attached to the heatsink lead
which exits opposite the input, output, and ground
pins.
Thermal Characteristics
The SPX1587 features the internal thermal limiting
to protect the device during overload conditions.
Special care needs to be taken during continuous load
conditions such that the maximum junction temperature does not exceed 125°C. Thermal protection is
activated at >179°C and deactiviated at <165 °C.
The thermal interaction from other components in
the application can effect the thermal resistance of
the SPX1587. The actual thermal resistance can be
determined with experimentation.
However the value of the ADJ-bypass capacitor
should be chosen with respect to the following
equation:
C = 1 / ( 6.28 * F
Where
* R1 )
R
C = value of the capacitor in Farads
(select an equal or larger standard value),
= ripple frequency in Hz,
F
R
= value of resistor R1 in Ohms.
R
1
If an ADJ-bypass capacitor is used, 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:
OUT
/ V
REF
M = V
Where M = multiplier for the ripple seen when the
ADJ pin is optimally bypassed.
V
=1.25V
REF
Ripple rejection for the adjustable version is
shown in Figure 5.
Output Voltage
The output of the adjustable regulator can be set to
any voltage between 1.25V and 15V. The value of
V
can be quickly approximated using the
OUT
formula
SPX1587 power dissipation is calculated as follows:
= (VIN - V
P
D
OUT
)(I
OUT
)
Maximum Junction Temperature range:
TJ = TA(max) + PD* thermal resistance
(junction-to-ambient)
Maximum junction temperature must not exceed the
125°C.
Ripple Rejection
Ripple rejection can be improved by adding a
A small correction to this formula is required
depending on the values of resistors R
since the adjustable pin current (approx 50µA)
flows through R
the formula becomes
where
V
=1.25 *(R1 + R2)/R
OUT
. When I
2
= V
V
OUT
(1+ (R2/R1)) + I
REF
V
is taken into account,
ADJ
=1.25V
REF
ADJ
1
and R2,
1
* R
2
capacitor between the ADJ pin and ground as
shown in Figure 8. When ADJ pin bypassing is
used, the value of the output capacitor required
increases to its maximum. If the ADJ pin is not
bypassed, the value of the output capacitor can be
lowered to 22µF for an electrolytic aluminum
capacitor or 10µF for a solid tantalum capacitor
(Fig 7).
Date: 5/25/04 SPX1587 3A Low Dropout Voltage Regulator © Copyright 2004 Sipex Corporation
Layout Considerations
Parasitic line resistance can degrade load
regulation. In order to avoid this, connect R
directly to V
same reason, R
negative side of the load.
as illustrated in Figure 13. For the
OUT
should be connected to the
2
1
4
Page 5
0
-10
-20
-30
-40
-50
-60
Ripple Rejection, Db
-70
-80
-90
10 100 1000 10000 100000 1000000
Frequency, Hz
Figure 5. Ripple Rejection; Vin=3.3V, Vout=1.8V (adj.),
Iload=200mA
APPLICATION INFORMATION: Continued
V
IN
+
4.7µF
C
I
OUT
Figure 6. Current Source
SPX1587
IN
1
V
REF
=
R
1
ADJ
OUT
R
LOAD
V
OUT
C
2
1
I
OUT
V
IN
+
C
4.7µF
SPX1587
IN
1
OUT
ADJ
I
ADJ
50µA
V
=V
REF
OUT
(1+R2/R
) +I
R
1
2
ADJ
Figure 7. Typical Adjustable Regulator
4.7µF
1K
SPX1587
IN
1k
OUT
ADJ
2N3904
V
IN
(Note A)
TTL
Input
+
V
REF
330W
1kΩ
1%
1%
(Note A)
V
IN
V
OUT
C
2
R
1
4.7µF
+
SPX1587
IN
ADJ
OUT
5V
R
1
330Ω
1%
V
OUT
10µF
R
2
+
C
1
10µF*
DROPOUT (MAX)
1kΩ,
1%
)
improves ripple rejection.
*C
R
2
1
Z
should be ~ R1 at ripple frequency
C
Note A: V
= (Intended V
IN(MIN)
) + (V
OUT
Figure 8. Improving Ripple Rejection
R
Parasitic Line
P
5V
+
10µF
V
IN
SPX1587
ADJ
Resistance
to
Connect R
Case of Regulator
R
R
1
2
Connect R
to Load
V
OUT
2
R
L
Note A: V
Figure 9. 5V Regulator with Shutdown
= (Intended V
IN(MIN)
) + (V )
DROPOUT (MAX)
OUT
Figure 10. Recommended Connections for Best Results
Date: 5/25/04 SPX1587 3A Low Dropout Voltage Regulator © Copyright 2004 Sipex Corporation
5
Page 6
PINOUTS
TO-252 (R)
ADJ/GND
Front View
1
V
23
V
OUT
IN
TO-220-3 (U)
ADJ/GND
Front View
1
V
23
V
OUT
IN
TO-263-3 (T)
1
ADJ/GND
Top View
2
3
V
OUT
V
IN
Date: 5/25/04 SPX1587 3A Low Dropout Voltage Regulator © Copyright 2004 Sipex Corporation
6
Page 7
PACKAGE: 3 PIN TO-252
GAUGE PLANE
L2
O
WITH PLATING
3 PIN TO-252
JEDEC TO-252
(AA) Variation
A1
c
D1
E1
H
L
L1
L2
c
c
L
(L1)
c
BASE METAL
CONTACT AREA
Dimensions in inches
MIN NOM MAX
- - .005
.018 - .024
.205 - -
.170 - -
.370 - .410
.055 .060 .070
b
.108 REF
.020 BSC
C
SEATING PLANE
A1
E1
E1/2
D1
3 PIN TO-252
Date: 5/25/04 SPX1587 3A Low Dropout Voltage Regulator © Copyright 2004 Sipex Corporation
7
Page 8
H1
PACKAGE: 3 PIN TO-220
φ P
E
α (5X)
Q
D
V
E-PIN
b1
L
e3
e
e1
C
L
F
A
R
C1
J1
DIMENSIONS
in inches
SYMBOL MIN MAX
A 0.160 0.190
b 0.025 0.040
C1 0.015 0.022
D 0.560 0.590
E 0.385 0.415
e 0.090 0.110
e1 0.190 0.210
e3 0.045 0.055
F 0.045 0.055
H1 0.234 0.258
J1 0.090 0.115
φ P 0.146 0.156
Q 0.103 0.113
L 0.540 0.560
α 3° typ 7° typ
b1 0.450 0.060
R0.243 REF 6.170 REF
U0.300 REF 7.620 REF
V0.240 REF 6.100 REF
3 Pin TO-220
Date: 5/25/04 SPX1587 3A Low Dropout Voltage Regulator © Copyright 2004 Sipex Corporation
8
Page 9
PACKAGE: 3 PIN TO-263
K
B
TERMINAL 8
V
A
S
H
G
D
U
E
M
L
W
P
-A-
N
R
C
DIMENSIONS
in inches
SYMBOL MIN MAX
A .396 0.406
B 0.326 0.336
C 0.170 0.180
D 0.026 0.036
E 0.045 0.055
G 0.100 REF 0.100 REF
H 0.580 0.620
K 0.055 0.066
L .000 .010
M 0.098 0.108
N .017 .023
P .090 .110
R0° 8°
S .095 .105
U .30 REF .30 REF
V .305 REF .305 REF
W .010 .010
3 Pin TO-263
Date: 5/25/04 SPX1587 3A Low Dropout Voltage Regulator © Copyright 2004 Sipex Corporation
9
Page 10
ORDERING INFORMATION
PART NUMBER ACC. OUTPUT VOLTAGE PACKAGE
SPX1587AR ................... 1% ................................. Adj ......................................... 3 lead TO-252
SPX1587AR/TR ............. 1% ................................. Adj ......................................... 3 lead TO-252
SPX1587AR-1.5 ............. 1% ................................ 1.5V ....................................... 3 lead TO-252
SPX1587AR-1.5/TR ....... 1% ................................ 1.5V ....................................... 3 lead TO-252
SPX1587AR-1.8 ............. 1% ................................ 1.8V ....................................... 3 lead TO-252
SPX1587AR-1.8/TR ....... 1% ................................ 1.8V ....................................... 3 lead TO-252
SPX1587AR-2.5 ............. 1% ................................ 2.5V ....................................... 3 lead TO-252
SPX1587AR-2.5/TR ....... 1% ................................ 2.5V ....................................... 3 lead TO-252
SPX1587AR-3.3 ............. 1% ................................ 3.3V ....................................... 3 lead TO-252
SPX1587AR-3.3/TR ....... 1% ................................ 3.3V ....................................... 3 lead TO-252
SPX1587AR-5.0 ............. 1% ................................ 5.0V ....................................... 3 lead TO-252
SPX1587AR-5.0/TR ....... 1% ................................ 5.0V ....................................... 3 lead TO-252
SPX1587AT.................... 1% ................................. Adj ......................................... 3 lead TO-263
SPX1587AT/TR .............. 1% ................................. Adj ......................................... 3 lead TO-263
SPX1587AT-1.5 ............. 1% ................................ 1.5V ....................................... 3 lead TO-263
SPX1587AT-1.5/TR........ 1% ................................ 1.5V ....................................... 3 lead TO-263
SPX1587AT-1.8 ............. 1% ................................ 1.8V ....................................... 3 lead TO-263
SPX1587AT-1.8/TR........ 1% ................................ 1.8V ....................................... 3 lead TO-263
SPX1587AT-2.5 ............. 1% ................................ 2.5V ....................................... 3 lead TO-263
SPX1587AT-2.5/TR........ 1% ................................ 2.5V ....................................... 3 lead TO-263
SPX1587AT-3.3 ............. 1% ................................ 3.3V ....................................... 3 lead TO-263
SPX1587AT-3.3/TR........ 1% ................................ 3.3V ....................................... 3 lead TO-263
SPX1587AT-5.0 ............. 1% ................................ 5.0V ....................................... 3 lead TO-263
SPX1587AT-5.0/TR........ 1% ................................ 5.0V ....................................... 3 lead TO-263
SPX1587AU ................... 1% ................................. Adj ......................................... 3 lead TO-220
SPX1587AU-1.5 ............. 1% ................................ 1.5V ....................................... 3 lead TO-220
SPX1587AU-1.8 ............. 1% ................................ 1.8V ....................................... 3 lead TO-220
SPX1587AU-2.5 ............. 1% ................................ 2.5V ....................................... 3 lead TO-220
SPX1587AU-3.3 ............. 1% ................................ 3.3V ....................................... 3 lead TO-220
SPX1587AU-5.0 ............. 1% ................................ 5.0V ....................................... 3 lead TO-220
Available in lead free packaging. To order add "-L" suffix to part number.
Example: SPX1587AT-5.0/TR = standard; SPX1587AT-L-5.0/TR = lead free
/TR = Tape and Reel
Pack quantity is 500 for TO-263 and 2,000 for TO-252.
Corporation
ANALOG EXCELLENCE
Sipex Corporation
Headquarters and
Sales Office
233 South Hillview Drive
Milpitas, CA 95035
TEL: (408) 934-7500
FAX: (408) 935-7600
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 SPX1587 3A Low Dropout Voltage Regulator © Copyright 2004 Sipex Corporation
10
Page 11
ORDERING INFORMATION
PART NUMBER ACC. OUTPUT VOLTAGE PACKAGE
SPX1587R...................... 2% ................................. Adj ......................................... 3 lead TO-252
SPX1587R/TR ................ 2% ................................. Adj ......................................... 3 lead TO-252
SPX1587R-1.5 ............... 2% ................................ 1.5V ....................................... 3 lead TO-252
SPX1587R-1.5/TR.......... 2% ................................ 1.5V ....................................... 3 lead TO-252
SPX1587R-1.8 ............... 2% ................................ 1.8V ....................................... 3 lead TO-252
SPX1587R-1.8/TR.......... 2% ................................ 1.8V ....................................... 3 lead TO-252
SPX1587R-2.5 ............... 2% ................................ 2.5V ....................................... 3 lead TO-252
SPX1587R-2.5/TR.......... 2% ................................ 2.5V ....................................... 3 lead TO-252
SPX1587R-3.3 ............... 2% ................................ 3.3V ....................................... 3 lead TO-252
SPX1587R-3.3/TR.......... 2% ................................ 3.3V ....................................... 3 lead TO-252
SPX1587R-5.0 ............... 2% ................................ 5.0V ....................................... 3 lead TO-252
SPX1587R-5.0/TR.......... 2% ................................ 5.0V ....................................... 3 lead TO-252
SPX1587T ...................... 2% ................................. Adj ......................................... 3 lead TO-263
SPX1587T/TR ................ 2% ................................. Adj ......................................... 3 lead TO-263
SPX1587T-1.5 ................ 2% ................................ 1.5V ....................................... 3 lead TO-263
SPX1587T-1.5/TR .......... 2% ................................ 1.5V ....................................... 3 lead TO-263
SPX1587T-1.8 ................ 2% ................................ 1.8V ....................................... 3 lead TO-263
SPX1587T-1.8/TR .......... 2% ................................ 1.8V ....................................... 3 lead TO-263
SPX1587T-2.5 ................ 2% ................................ 2.5V ....................................... 3 lead TO-263
SPX1587T-2.5/TR .......... 2% ................................ 2.5V ....................................... 3 lead TO-263
SPX1587T-3.3 ................ 2% ................................ 3.3V ....................................... 3 lead TO-263
SPX1587T-3.3/TR .......... 2% ................................ 3.3V ....................................... 3 lead TO-263
SPX1587T-5.0 ................ 2% ................................ 5.0V ....................................... 3 lead TO-263
SPX1587T-5.0/TR .......... 2% ................................ 5.0V ....................................... 3 lead TO-263
SPX1587U...................... 2% ................................. Adj ......................................... 3 lead TO-220
SPX1587U-1.5 ............... 2% ................................ 1.5V ....................................... 3 lead TO-220
SPX1587U-1.8 ............... 2% ................................ 1.8V ....................................... 3 lead TO-220
SPX1587U-2.5 ............... 2% ................................ 2.5V ....................................... 3 lead TO-220
SPX1587U-3.3 ............... 2% ................................ 3.3V ....................................... 3 lead TO-220
SPX1587U-5.0 ............... 2% ................................ 5.0V ....................................... 3 lead TO-220
Available in lead free packaging. To order add "-L" suffix to part number.
Example: SPX1587AT-5.0/TR = standard; SPX1587AT-L-5.0/TR = lead free
/TR = Tape and Reel
Pack quantity is 500 for TO-263 and 2,000 for TO-252.
Corporation
ANALOG EXCELLENCE
Sipex Corporation
Headquarters and
Sales Office
233 South Hillview Drive
Milpitas, CA 95035
TEL: (408) 934-7500
FAX: (408) 935-7600
Date: 5/25/04 SPX1587 3A Low Dropout Voltage Regulator © Copyright 2004 Sipex Corporation
11
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