SPX3940M3-5.0-L [EXAR]
Fixed Positive LDO Regulator, 5V, 0.55V Dropout, PDSO4, LEAD FREE, SOT-223, 4 PIN;
| 型号： | SPX3940M3-5.0-L |
| 厂家： | 
EXAR CORPORATION |
| 描述： | Fixed Positive LDO Regulator, 5V, 0.55V Dropout, PDSO4, LEAD FREE, SOT-223, 4 PIN 光电二极管 输出元件 调节器 |
| 文件： | 总11页 (文件大小：202K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
®
SPX3940
1A Low Dropout Voltage Regulator
Fixed Output, Fast Response
FEATURES
■ 1% Output Accuracy SPX3940A
■ Guaranteed 1.5A Peak Current
■ Low Quiescent Current
■ Low Dropout Voltage of 280mV at 1A
■ Extremely Tight Load and Line Regulation
■ Extremely Fast Transient Response
■ Reverse-battery Protection
SPX3940
3 Pin TO-263
1
2
3
VOUT
VIN
GND
Now Available in Lead Free Packaging
■ Internal Thermal Protection
■ Internal Short Circuit Current Limit
■ Replacement for LM3940
■ Standard SOT-223, TO-220
and TO-263 packages
■ SMPS Post-Regulator
APPLICATIONS
■ Laptop, Palmtop, and Note-
■ Powering VGA & Sound Card
■ Automotive Electronics
■ LCD Monitors
book Computer
■ High Efficiency Linear Power
Supplies
■ Portable Instrumentation
■ Constant Current Regulators
DESCRIPTION
■ Cordless Telephones
■ Power PCTM Supplies
The SPX3940 is a 1A, accurate voltage regulators with a low drop out voltage of 280mV(typical)
at 1A. These regulators are specifically designed for low voltage applications that require a low
dropoutvoltageandafasttransientresponse. Theyarefullyfaultprotectedagainstover-current,
reverse battery, and positive and negative voltage transients.
The SPX3940 is offered in 3-pin SOT-223, TO-220 & TO-263 packages. For a 3A version, refer
to the SPX29300 data sheet.
TYPICAL APPLICATIONS CIRCUIT
SPX3940
1
3
VOUT
V
IN
+
+
2
10µF
6.8µF
Figure 1. Fixed Output Linear Regulator.
Date: 5/25/04
SPX3940 1A Low Dropout Voltage Regulator
© Copyright 2004 Sipex Corporation
1
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 5) ................................................................... 16V
ELECTRICAL CHARACTERISTICS
At VIN=VOUT + 1V and IOUT = 10 mA, CIN = 6.8 µF, COUT = 10µF; TA= 25°C, unless otherwise specified.
The Boldface applies over the junction temperature range. Adjustable versions are set at 5.0V.
PARAMETER
CONDITIONS
TYP
MIN
MAX
MIN
MAX
UNITS
SPX3940A (1%)
SP3940 (2%)
1.8V Version
Output Voltage
IOUT = 10mA
1.8
1.782
1.818
1.764
1.836
V
V
V
V
10mA≤IOUT≤1A, 6V≤VIN≤16V
1.8
1.755
1.845
1.737
1.863
2.5V Version
Output Voltage
IOUT = 10mA
2.5
2.475
2.525
2.450
2.412
2.550
2.588
10mA≤IOUT ≤1A, 6V≤VIN≤16V
2.5
2.437
2.563
3.3V Version
Output Voltage
IOUT = 10mA
3.3
3.267
3.333
3.234
3.366
10mA≤IOUT ≤1A, 6V≤VIN≤16V
3.3
3.217
3.383
3.184
3.416
5.0V Version
Output Voltage
IOUT = 10mA
5.0
4.950
5.050
4.900
4.825
5.100
10mA≤IOUT ≤1A, 6V≤VIN≤16V
5.0
4.875
5.125
5.175
All Voltage Options
Line Regulation
Load Regulation
∆V
IO=10mA, (VOUT+1V)≤VIN≤16V
VIN=VOUT+1V, 10mA≤IOUT≤1A
Output Voltage
0.2
0.3
20
1.0
1.5
1.0
1.5
%
%
100
100
ppm/°C
∆T
Temperature Coef.
IO =100mA
Dropout Voltage (Note 1)
(except 1.8V version)
Ground Current (Note 3)
70
280
12
200
550
25
200
550
25
mV
mA
mA
IO =1A
IO =750mA, VIN=VOUT, + 1V
IO =1A
18
IGNDDO Ground Pin
Current at Dropout
Current Limit
VIN=0.1V less than specified VOUT
IOUT= 10mA
1.2
VOUT=0V (Note 2)
CL= 10µF
2.2
1.5
1.5
A
Output Noise Voltage
(10Hz to 100kHz)
IL=100mA
400
µVRMS
CL=33µF
260
3
Thermal Resistance
TO-220 Junction to Case, at Tab
TO-220 Junction to Ambient
TO-263 Junction to Case, at Tab
TO-263 Junction to Ambient
SOT-223 Junction to Case, at Tab
SOT-223 Junction to Ambient
°C/W
°C/W
°C/W
60
3
60
15
150
NOTES:
Note 1: Dropout voltage is defined as the input to output differential when the output voltage drops to 99% of its normal value.
Note 2: V =V + 1V. For example, use V =4.3V for a 3.3V regulator. Employ pulse-testing procedures to minimize temperature rise.
IN
OUT (NOMINAL)
IN
Note 3: Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum of the load current to the ground current.
Note 4: Thermal regulation is defined as the change in the output voltage at a time T after a change in power dissipation is applied, excluding load or line regulation effects.
Note 5: Maximum positive supply voltage of 20V must be of limited duration (<100ms) and duty cycle (<1%). The maximum continuous supply voltage is 16V.
Date: 5/25/04
SPX3940 1A Low Dropout Voltage Regulator
© Copyright 2004 Sipex Corporation
2
BLOCK DIAGRAM
IN
OUT
O.V
ILIMIT
1.240V
28V
R1
Reference
+
-
Ibias
Thermal
Shutdown
R2
GND
TYPICAL PERFORMANCE CHARACTERISTICS
3.310
3.305
3.300
3.295
3.290
3.320
3.315
3.310
3.305
3.300
3.295
3.290
3.285
3.280
3.3V Device
IL = 10mA
CL = 10µF
3.3V Device
IL=4.3mA
CL=10µF
3.285
3.280
4
6
8
10
12
14
16
0
0.25
0.5
0.75
1
1.25
1.5
VIN (V)
IL (A)
Figure 2. Line Regulation
Figure 3. Load Regulation
100
95
90
85
80
75
70
80.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
0.0
3.3V Device
IL = 10 mA
CL = 10µF
3.3V Device
CILN = 10µF
V
= 4.3V
0
0.25
0.5
0.75
1
1.25
1.5
-40
-20
0
20
40
VIN (V)
60
80
100
120
IL (A)
Figure 4. Ground Current vs Load Current
Figure 5. Ground Current vs Input Voltage
Date: 5/25/04
SPX3940 1A Low Dropout Voltage Regulator
© Copyright 2004 Sipex Corporation
3
TYPICAL PERFORMANCE CHARACTERISTICS
100
90
80
70
60
50
40
30
20
10
0
600
500
400
300
200
3.3 Device
VIN = 3.2V
CL = 10µF
3.3V Device
100
CL = 10µF
0
0
0.25
0.5
0.75
1
1.25
1.5
0
0.25
0.5
0.75
1
1.25
1.5
IL (A)
IL(A)
Figure 6. Ground Current vs Load Current in Dropout
Figure 7. Dropout Voltage vs Load Current
280
270
260
250
240
230
220
3.320
3.310
3.300
3.290
3.280
3.270
3.260
3.250
3.240
3.230
3.220
3.3V Device
VIN = 4.3V
IL = 10mA
CL = 10µF
210
200
190
180
3.3V Device
VIN = 4.3V
IL = 10mA
CL = 10µF
-40
-20
0
20
40
60
80
100
120
-40
-20
0
20
40
60
80
100
120
Temperature (°C)
Temperature (°C)
Figure 8. Ground Current vs Temperature at
ILOAD = 10mA
Figure 9. Output Voltage vs Temperature at
ILOAD=10mA
7.00
6.80
30
29
3.3V Device
3.3V Device
VIN = 4.3V
IL = 500mA
CL = 10µF
VIN = 3.2V
6.60
6.40
6.20
6.00
5.80
5.60
5.40
5.20
5.00
28
27
26
25
24
23
22
21
20
IL = 750mA
CL = 10µF
-40
-20
0
20
40
60
80
100
120
-40
-20
0
20
40
60
80
100
120
Temperature (°C)
Temperature (°C)
Figure 10. Ground Current vs Temperature at
ILOAD=500mA
Figure 11. Ground Current vs Temperature in Dropout
at ILOAD=750mA
Date: 5/25/04
SPX3940 1A Low Dropout Voltage Regulator
© Copyright 2004 Sipex Corporation
4
TYPICAL PERFORMANCE CHARACTERISTICS
100
95
52.0
50.0
48.0
46.0
44.0
42.0
40.0
38.0
36.0
90
85
3.3V Device
IN = 4.3V
IL=1.5A
80
3.3V Device
V
VIN = 3.2V
IL = 1.5A
75
CL = 10µF
CL = 10µF
70
-40
-40
-20
0
20
40
60
80
100
120
-20
0
20
40
60
80
100
120
Temperature (°C)
Temperature (°C)
Figure 12. Ground Current vs Temperature at ILOAD= 1.5A
Figure 13. Ground Current vs Temperature in Dropout
at ILOAD=1.5A
350
330
310
290
270
250
230
500
480
460
440
420
400
3.3V Device
IL = 1.5A
380
360
340
320
3.3V Device
210
IL = 750mA
CL = 10µF
190
170
150
CL = 10µF
-40
-20
0
20
40
60
80
100
120
-40
-20
0
20
40
60
80
100
120
Temperature (°C)
Temperature (°C)
Figure 14. Dropout Voltage vs Temperature at
ILOAD= 750mA
Figure 15. Dropout Voltage vs Temperature at
ILOAD= 1.5mA
35
30
25
20
15
2.00
1.90
3.3V Device
1.80
1.70
1.60
1.50
1.40
1.30
1.20
1.10
1.00
VIN = 3.2V
IL = 750mA
CL = 10µF
10
5
3.3V Device
VIN = 3.2V
IL = 750mA
CL = 10µF
0
-40
100
120
-20
0
20
40
60
80
100
120
-40
-20
0
20
40
60
80
Temperature (°C)
Temperature (°C)
Figure 16. Enable Current vs Temperature for VEN= 16V
Figure 17. Enable Threshold vs Temperature
Date: 5/25/04
SPX3940 1A Low Dropout Voltage Regulator
© Copyright 2004 Sipex Corporation
5
APPLICATION INFORMATION
For example, TO-220 design:
Assume that V = 10V, VOUT = 5V, IOUT = 1.5A,
TA = 50°C/W, IθNHA= 1°C/W, θCH = 2°C/W, and
θJC = 3°C/W.
The SPX3940 incorporates protection against
over-currentfaults,reversedloadinsertion,over
temperature operation, and positive and nega-
tive transient voltage.
Where TA = ambient temperature
θ
= heatsink to ambient thermal resistance
Thermal Considerations
θCHHA = case to heatsink thermal resistance
θJC = junction to case thermal resistance
Although the SPX3940 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 mount-
ing is required. Consult heatsink manufacturer
for thermal resistance and design of heatsink.
The power calculated under these conditions is:
PD = (VIN - VOUT) * IOUT = 7.5W.
And the junction temperature is calculated as
T = TA + PD * (θHA + θ + θJC) or
TJJ = 50 + 7.5 * (1 + 2 +C3H) = 95°C
Reliable operation is insured.
SPX3940
1
3
VOUT
V
IN
+
+
2
10µF
6.8µF
Figure 18. Fixed Output Linear Regulator.
Capacitor Requirements
The output capacitor is needed to insure stability and minimize the output noise. The value of the
capacitorvarieswiththeload. However,aminimumvalueof10µFaluminumcapacitorwillguarantee
stability over all load conditions. A tantalum capacitor is recommended if a faster load transient
response is needed.
If the power source has a high AC impedance, a 0.1µF ceramic capacitor 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 SPX3940
is required.
Date: 5/25/04
SPX3940 1A Low Dropout Voltage Regulator
© Copyright 2004 Sipex Corporation
6
PACKAGE: TO-263
SEATING PLANE
C2
E
A
E/2
L1
D
H
1
2
3
B
B
c
e
See View C
b
b2
SEATING
PLANE
GAUGE PLANE
0º-8º
A1
L
3-PIN TO-263
JEDEC TO-263
(AA) Variation
Dimensions in inches
MIN NOM MAX
View C
A
A1
b
.160
.000
-
.190
.010
-
.020
.015
.330
-
.039
.029
.380
b
c
-
-
D
WITH PLATING
c
D1
E
.270
-
-
.420
-
.380
.245
-
E1
-
e
.100 BSC
.625
H
.575
-
BASE METAL
SECTION B-B
L
.070
-
.110
.066
.070
L1
L2
L3
-
-
-
-
.010 BSC
3 PIN TO-263
Date: 5/25/04
SPX3940 1A Low Dropout Voltage Regulator
© Copyright 2004 Sipex Corporation
7
PACKAGE: 3 PIN TO-220
A
E
B
E/2
E2
SEATING
PLANE
A
øP
Q
A1
H1
D
D1
CHAMFER
OPTIONAL
L1
1
D
D
C
C
L
b
A
e
C
e1
A2
3 PIN TO-220
JEDEC TO-220
(AB) Variation
Dimensions in
(mm)
MIN NOM MAX
b
A
.140
.020
-
-
.190
.055
A1
A2
b
WITH PLATING
c
.080
-
.115
.015 .027 .040
b2
c
.045
.014
.560
-
.070
.024
.650
-
-
D
D1
.330
.480
.380
.270
-
-
-
-
-
.355
.507
.420
.350
BASE METAL
CONTACT AREA
D2
E
E1
E2
e
-
.030
.100 BSC
.200 BSC
e1
.230
-
.270
.250
H1
L1
-
-
3 PIN TO-220
-
-
-
L2
.139
.100
-
.161
.135
∆P
Q
-
Date: 5/25/04
SPX3940 1A Low Dropout Voltage Regulator
© Copyright 2004 Sipex Corporation
8
PACKAGE: 3 PIN SOT-23
D
b
3
B
B
SEE VIEW C
VIEW A-A
E1
E
1
2
e
Gauge Plane
e1
Seating Plane
L
Ø
L1
VIEW C
3 PIN SOT-23
JEDEC TO-236
(AB) Variation
Dimensions in (mm)
MIN NOM MAX
A
A2
A
A
0.89
0.01
-
1.12
0.10
Seating Plane
A1
A2
b
-
C
A
A1
SIDE VIEW
0.88 0.95 1.02
0.30
0.08
-
0.50
0.20
c
-
D
2.80 2.90 3.04
0.95 BSC
b
e
WITH PLATING
1.90 BSC
e1
E
2.10
-
2.64
c
1.20 1.30 1.40
E1
L
0.40 0.50
0.54 REF
0.60
8º
L1
Ø
BASE METAL SECTION B-B
0º
-
3 PIN SOT-23
Date: 5/25/04
SPX3940 1A Low Dropout Voltage Regulator
© Copyright 2004 Sipex Corporation
9
PINOUTS
TO-263-3 Package (T)
TO-220-3 Package (U)
SOT-223 (M3)
1
2
3
1
2
3
1
2 3
V
V
GND
IN
OUT
VIN GND VOUT
VIN GND VOUT
Front View
TAB=GND
Front View
TAB=GND
Top View
TAB=GND
ORDERING INFORMATION
PART NUMBER
SPX3940AU-1.8
SPX3940AU-2.5
SPX3940AU-3.3
SPX3940AU-5.0
SPX3940AT-1.8
SPX3940AT-1.8/TR
SPX3940AT-2.5
SPX3940AT-2.5/TR
SPX3940AT-3.3
SPX3940AT-3.3/TR
SPX3940AT-5.0
SPX3940AT-5.0/TR
SPX3940U-1.8
ACC.
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
2%
2%
2%
2%
OUTPUT VOLTAGE
PACKAGE
3 lead TO-220
3 lead TO-220
3 lead TO-220
3 lead TO-220
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
1.8V
2.5V
3.3V
5.0V
1.8V
1.8V
2.5V
2.5V
3.3V
3.3V
5.0V
5.0V
1.8V
2.5V
3.3V
5.0V
SPX3940U-2.5
SPX3940U-3.3
SPX3940U-5.0
Available in lead free packaging. To order add "-L" suffix to part number.
Example: SPX3940AT-3.3/TR = standard; SPX3940AT-L-3.3/TR = lead free
/TR = Tape and Reel
Pack quantity is 500 for TO-263 and 2,500 for SOT-23.
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
SPX3940 1A Low Dropout Voltage Regulator
© Copyright 2004 Sipex Corporation
10
ORDERING INFORMATION
PART NUMBER
SPX3940T-1.8
ACC.
2%
2%
2%
2%
2%
2%
2%
2%
1%
1%
1%
1%
1%
1%
1%
1%
2%
2%
2%
2%
2%
2%
2%
2%
OUTPUT VOLTAGE
PACKAGE
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 SOT-223
3 lead SOT-223
3 lead SOT-223
3 lead SOT-223
3 lead SOT-223
3 lead SOT-223
3 lead SOT-223
3 lead SOT-223
3 lead SOT-223
3 lead SOT-223
3 lead SOT-223
3 lead SOT-223
3 lead SOT-223
3 lead SOT-223
3 lead SOT-223
3 lead SOT-223
1.8V
1.8V
2.5V
2.5V
3.3V
3.3V
5.0V
5.0V
1.8V
1.8V
2.5V
2.5V
3.3V
3.3V
5.0V
5.0V
1.8V
1.8V
2.5V
2.5V
3.3V
3.3V
5.0V
5.0V
SPX3940T-1.8/TR
SPX3940T-2.5
SPX3940T-2.5/TR
SPX3940T-3.3
SPX3940T-3.3/TR
SPX3940T-5.0
SPX3940T-5.0/TR
SPX3940AM3-1.8
SPX3940AM3-1.8/TR
SPX3940AM3-2.5
SPX3940AM3-2.5/TR
SPX3940AM3-3.3
SPX3940AM3-3.3/TR
SPX3940AM3-5.0
SPX3940AM3-5.0/TR
SPX3940M3-1.8
SPX3940M3-1.8/TR
SPX3940M3-2.5
SPX3940M3-2.5/TR
SPX3940M3-3.3
SPX3940M3-3.3/TR
SPX3940M3-5.0
SPX3940M3-5.0/TR
Available in lead free packaging. To order add "-L" suffix to part number.
Example: SPX3940AM3-3.3/TR = standard; SPX3940AM3-L-3.3/TR = lead free
/TR = Tape and Reel
Pack quantity is 500 for TO-263 and 2,500 for SOT-23.
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
SPX3940 1A Low Dropout Voltage Regulator
© Copyright 2004 Sipex Corporation
11
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