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SPX2940 1A Low Dropout Voltage Regulator
Fixed Output, Fast Response
FEATURES Guaranted 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 Internal Thermal Protection Internal Short Circuit Current Limit Replacement for LM2940, MIC2940A, AS2940 Standard TO-220 and TO-263 packages APPLICATIONS Powering VGA & Sound Card LCD Monitors USB Power Supply Power PCTM Supplies SMPS Post-Regulator
SPX2940
3 Pin TO-263
1
2
3
VIN
GND VOUT
Now Available in Lead Free Packaging

PDA or Notebook Computer High Efficiency Linear Power Supplies Portable Instrumentation Constant Current Regulators Cordless Telephones Automotive Electronics DESCRIPTION
The SPX2940 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 dropout voltage and a fast transient response. They are fully fault protected against over-current, reverse battery, and positive and negative voltage transients. The SPX2940 is offered in 3-pin TO-220 & TO-263 packages. For a 3A version, refer to the SPX29300 data sheet. TYPICAL APPLICATIONS CIRCUIT
VIN 6.8F +
1 SPX2940 2
3 + 10F
VOUT
Figure 1. Fixed Output Linear Regulator.
Date: 5/25/04
SPX2940 1A Low Dropout Voltage Regulator
(c) Copyright 2004 Sipex Corporation
1
ABSOLUTE MAXIMUM RATINGS
Lead Temperature (soldering, 5 seconds) ................................. 260C Storage Temperature Range ..................................... -65C to +150C Operating Junction Temperature Range ................... -40C to +125C Input Voltage (Note 5) ................................................................... 16V
ELECTRICAL CHARACTERISTICS
at VIN=VOUT + 1V and IOUT = 10 mA, CIN = 6.8 F, COUT = 10F; TA= 25C, unless otherwise specified. The Boldface applies over the junction temperature range. Adjustable versions are set at 5.0V.
PARAMETER 1.8V Version Output Voltage 2.5V Version Output Voltage 3.3V Version Output Voltage 5.0V Version Output Voltage All Voltage Options Line Regulation Load Regulation V T Dropout Voltage (Note 1) (except 1.8V version) Ground Current (Note 3) IGNDDO Ground Pin Current at Dropout Current Limit Output Noise Voltage 10Hz to 100kHz) IL=100mA Thermal Resistance
CONDITIONS IOUT = 10mA 10mAIOUT1A, 6VVIN16V IOUT = 10mA 10mAIOUT 1A, 6VVIN16V IOUT = 10mA 10mAIOUT 1A, 6VVIN16V IOUT = 10mA 10mAIOUT 1A, 6VVIN16V IO=10mA, (VOUT+1V)VIN16V VIN=VOUT+1V, 10mAIOUT1A Output Voltage Temperature Coef. IO =100mA IO =1A IO =750mA, VIN=VOUT, + 1V IO =1A VIN=0.1V less than specified VOUT IOUT= 10mA VOUT=0V (Note 2) CL= 10F
TYP 1.8 1.8 2.5 2.5 3.3 3.3 5.0 5.0 0.2 0.3 20 70 280 12 18 1.2 2.2 400
MIN 1.746 1.710 2.425 2.375 3.201 3.135 4.850 4.750
MAX UNITS 1.854 1.890 2.575 2.625 3.399 3.465 5.150 5.250 1.0 1.5 100 200 550 25 V
V
V
V
% % ppm/C mV mA mA
1.5
A VRMS
CL=33F 260 TO-220 Junction to Case, at Tab 3 TO-220 Junction to Ambient 60 TO-263 Junction to Case, at Tab 3 TO-263 Junction to Ambient 60
C/W
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: VIN=VOUT (NOMINAL) + 1V. For example, use VIN=4.3V for a 3.3V regulator. Employ pulse-testing procedures to minimize temperature rise. 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
SPX2940 1A Low Dropout Voltage Regulator
(c) Copyright 2004 Sipex Corporation
2
BLOCK DIAGRAM
IN O.V I LIMIT Reference 1.240V + Ibias 28V R1
OUT
Thermal Shutdown
R2
GND
TYPICAL PERFORMANCE CHARACTERISTICS
3.320 3.315 3.310
3.310 3.305 3.300 3.295 3.290 3.285 3.280 0.00
VOUT (V)
3.300 3.295 3.290 3.285 3.280 4 6 8 10 12 14 16 3.3V Device IL = 10mA CL = 10F
VOUT (V)
3.305
3.3V Device VIN = 4.3V CL = 10F
0.25
0.50
0.75
1.00
1.25
1.50
VIN (V)
IL (A)
Figure 2. Line Regulation
Figure 3. Load Regulation
80.0 70.0
300 280
IGnd (mA)
60.0
IGnd (mA)
50.0 40.0 30.0 20.0 10.0 0.0 0.00
260 240 220
3.3V Device VIN = 4.3V CL = 10F
0.25 0.50 0.75 1.00 1.25 1.50
200 180 4 6 8 10 12
3.3V Device IL = 10mA CL = 10F
14
16
IL (A)
VIN (V)
Figure 4. Ground Current vs Load Current
Figure 5. Ground Current vs Input Voltage
Date: 5/25/04
SPX2940 1A Low Dropout Voltage Regulator
(c) Copyright 2004 Sipex Corporation
3
TYPICAL PERFORMANCE CHARACTERISTICS
100 90
600 500
70
VDROPOUT (mV)
80
IGnd (mA)
400 300 200 100 0 0.00
60 50 40 30 20 10 0 0.00 0.25 0.50 0.75 1.00
3.3V Device VIN = 3.2V CL = 10F
1.25 1.50
3.3V Device CL = 10F
0.25
0.50
0.75
1.00
1.25
1.50
IL (A)
IL (A)
Figure 6. Ground Current vs Current in Dropout
Figure 7. Dropout Voltage vs Load Current
280 270 260 250
3.320 3.310 3.300 3.290
IGnd (A)
VOUT (V)
240 230 220 210 200 190 180 -40 -20 0 20 40 60 80 3.3V Device VIN = 4.3V IL = 10mA CL = 10F 100 120
3.280 3.270 3.260 3.250 3.240 3.230 3.220 -40 -20 0 20 40 60 80 3.3V Device VIN = 4.3V IL = 10mA CL = 10F 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 6.60 3.3V Device VIN = 4.3V IL = 500mA CL = 10F
30 29 28 3.3V Device VIN = 3.2V IL = 750mA CL = 10F
IGnd (mA)
IGnd (mA)
6.40 6.20 6.00 5.80 5.60 5.40 5.20 5.00 -40 -20 0 20 40 60 80
27 26 25 24 23 22 21 20 -40
100
120
-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
SPX2940 1A Low Dropout Voltage Regulator
(c) Copyright 2004 Sipex Corporation
4
TYPICAL PERFORMANCE CHARACTERISTICS
52.0 50.0
100 95
IGnd (mA)
IGnd (mA)
48.0 46.0 44.0 42.0 40.0 38.0 36.0 -40 -20 0 20 40 60 80 3.3V Device VIN = 4.3V IL = 1.5A CL = 10F 100 120
90 85 80 75 70 -40
3.3V Device VIN = 3.2V IL = 1.5A CL = 10F -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
500 480
VDROPOUT (mV)
290 270 250 230 210 190 170 150 -40 -20 0 20 40 60 80 100 120 3.3V Device IL = 750mA CL = 10F
VDROPOUT (mV)
460 440 420 400 380 360 340 320 -40 -20 0 20 40 60 80 100 120 3.3V Device IL = 750A CL = 10F
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
2.00 1.90 1.80 1.70 1.60 3.3V Device VIN = 3.2V IL = 750mA CL = 10F
IEN (A)
VTH (V)
20 15 10 5 0 -40 -20 0 20 40 60 80 3.3V Device VIN = 3.2V IL = 750mA CL = 10F 100 120
1.50 1.40 1.30 1.20 1.10 1.00 -40 -20 0 20 40 60 80 100 120
Temperature (C)
Temperature (C)
Figure 16. Enable Current vs Temperature for VEN= 16V
Figure 17. Enable Threshold vs Temperature
Date: 5/25/04
SPX2940 1A Low Dropout Voltage Regulator
(c) Copyright 2004 Sipex Corporation
5
APPLICATION INFORMATION The SPX2940 incorporates protection against over-current faults, reversed load insertion, over temperature operation, and positive and negative transient voltage. Thermal Considerations Although the SPX2940 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. Consult heatsink manufacturer for thermal resistance and design of heatsink. For example, TO-220 design: Assume that VIN = 10V, VOUT = 5V, IOUT = 1.5A, TA = 50C/W, HA= 1C/W, CH = 2C/W, and JC = 3C/W. Where TA = ambient temperature HA = heatsink to ambient thermal resistance CH = case to heatsink thermal resistance JC = junction to case thermal resistance The power calculated under these conditions is: PD = (VIN - VOUT) * IOUT = 7.5W. And the junction temperature is calculated as TJ = TA + PD * (HA + CH + JC) or TJ = 50 + 7.5 * (1 + 2 + 3) = 95C Reliable operation is insured.
VIN 6.8F +
1 SPX2940 2
3 + 10F
VOUT
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 capacitor varies with the load. However, a minimum value of 10F aluminum capacitor will guarantee 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 0.1F 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 SPX2940 is required.
Date: 5/25/04
SPX2940 1A Low Dropout Voltage Regulator
(c) Copyright 2004 Sipex Corporation
6
PACKAGE: 3 PIN TO-263
E E/2 L1
SEATING PLANE A C2
D
H
1
2
3 B B c
e See View C
b2
b GAUGE PLANE 0-8 A1 View C SEATING PLANE
L
3-PIN TO-263 JEDEC TO-263 (AA) Variation A A1 b c D D1 E E1 e H L L1 L2 L3 .575 .070 Dimensions in inches MIN .160 .000 .020 .015 .330 .270 .380 .245 .100 BSC .625 .110 .066 .070 NOM MAX .190 .010 .039 .029 .380 .420 -
b
WITH PLATING
c
BASE METAL SECTION B-B
.010 BSC
3 PIN TO-263
Date: 5/25/04 SPX2940 1A Low Dropout Voltage Regulator (c) Copyright 2004 Sipex Corporation
7
PACKAGE: 3 PIN TO-220
E
B A
E2
E/2
A SEATING PLANE
Q
oP
A1
H1
D D1 L1
1
CHAMFER OPTIONAL
CC
D
D L
e
e1
b
C A2
A
Dimensions in (mm) A A1 A2 b b2 c D D1 D2 E E1 E2 e e1 H1 L1 L2 P Q
3 PIN TO-220 JEDEC TO-220 (AB) Variation
MIN NOM MAX
.140 .020 .080 .015 .045 .014 .560 .330 .480 .380 .270 -
.027 -
.190 .055 .115 .040 .070 .024 .650 .355 .507 .420 .350 .030
b
WITH PLATING
c
BASE METAL CONTACT AREA
.100 BSC .200 BSC .230 .139 .100 .270 .250 .161 .135
3 PIN TO-220
Date: 5/25/04
SPX2940 1A Low Dropout Voltage Regulator
(c) Copyright 2004 Sipex Corporation
8
PACKAGE PINOUTS
TO-263-3 Package (T) TO-220-3 Package (U)
1
2
3
1
23
VIN GND VOUT V GND VOUT IN Front View TAB = GND Front View TAB = GND
ORDERING INFORMATION
PART NUMBER ACC. OUTPUT VOLTAGE PACKAGE
SPX2940U-1.8 SPX2940U-2.5 SPX2940U-3.3 SPX2940U-5.0 SPX2940T-1.8 SPX2940T-1.8/TR SPX2940T-2.5 SPX2940T-2.5/TR SPX2340T-3.3 SPX2340T-3.3/TR SPX2940T-5.0 SPX2940T-5.0/TR
3% 3% 3% 3% 3% 3% 3% 3% 3% 3% 3% 3%
1.8V 2.5V 3.3V 5.0V 1.8V 1.8V 2.5V 2.5V 3.3V 3.3V 5.0V 5.0V
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
Available in lead free packaging. To order add "-L" suffix to part number. Example: SPX2940T-3.3/TR = standard; SPX2940T-3.3-L/TR = lead free /TR = Tape and Reel Pack quantity is 500 for TO-263.
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
SPX2940 1A Low Dropout Voltage Regulator
(c) Copyright 2004 Sipex Corporation
9


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