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SPX2941 1A Low Dropout Voltage Regulator,
Adjustable Output, Fast Response
Now Available in Lead Free Packaging APPLICATIONS Powering VGA & Sound Card LCD Monitors USB Power Supply Power PC Supplies SMPS Post-Regulator High Efficiency Linear Power Supplies Battery Charger Portable Instrumentation Constant Current Regulators Adjustable Power Supplies DESCRIPTION The SPX2941 is a 1A, accurate voltage regulator with a low drop out voltage of 280mV(typ.) 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. Other features include Enable, and Error Flag. The SPX2941 is offered in 5-pin TO-220 & TO-263 packages. For a 3A version, refer to the SPX29300 data sheet.
TYPICAL APPLICATIONS CIRCUIT
VIN 6.8F + 4 EN 2 5 + ADJ R1 VOUT 10F
FEATURES Adjustable Output Down To 1.25V Low Quiescent Current Guaranteed 1.5A Peak Output Current Low Dropout Voltage of 280mV @ 1A Extremely Tight Load and Line Regulation Extremely Fast Transient Response Reverse-battery Protection Internal Thermal and Current Limit Protection Zero Current Shutdown Error Flag Output for Out of Regulation State Standard TO-220 and TO-263 packages Replacement for LM2941 and AS2941
SPX2941
5 Pin TO-263
12345
ADJUST
ENABLE
GND
SPX2941
3 1
GND
R2
Figure 1. Adjustable Output Linear Regulator
Date: 08/25/04 SPX2941 1A Low Dropout Voltage Regulator (c) Copyright 2004 Sipex Corporation
1
VOUT VIN
ABSOLUTE MAXIMUM RATINGS
Lead Temperature (soldering, 5 seconds) ................260C Storage Temperature Range........................-65C to +150C Operating Junction Temperature Range......-40C to +125C Input Supply Voltage (NOTE 7) .... .....................................16V
ELECTRICAL CHARACTERISTICS
VIN=VOUT + 1V, IOUT=10mA, CIN=6.8F, COUT=10F, TA = 25C, unless otherwis specified. The boldface applies over the junction temperature range. Adjustable versions are set at +5.0V. PARAMETER Reference Voltage Adjust Pin Bias Current Reference Voltage Temperature Coefficient Adjust Pin Bias Current Temperature Coefficient Line Regulation Load Regulation Dropout Voltage (Note1) (except 1.8V version) Ground Current (Note3) (NOTE 4) CONDITIONS Adjustable version only MIN. 1.228 1.215 TYP. 1.240 40 20 0.1 0.2 0.3 70 280 12 18 1.2 1.5 2.2 400 260 0.1 200 40 25 60 75 15 0.8 2.4 100 600 750 1 2 10 500 Junction to Case, at Tab Junction to Ambient Junction to Case, at Tab Junction to Ambient 3 60 3 60 C/W C/W A 95 140 1 2 300 400 1.0 1.5 200 550 25 MAX 1.252 1.265 80 120 UNIT V V ppm/C nA/C % % mV mA mA A VRMS
IOUT=10mA, (VOUT+1V)VIN16V VIN=VOUT+1V, 10mAIOUTIFULL IOUT=100mA IOUT=1A IOUT=750mA, VIN=VOUT+1V IOUT=1A Ground Pin Current at VIN=0.1V less than specified VOUT, Dropout IOUT=10mA Current Limit VOUT=0V (Note2) Output Noise Voltage 10Hz to 100kHz, IOUT =100mA, CL=10F CL=33F ERROR COMPARATOR (FLAG OUTPUT) Output Leakage Current VOH=16V Output Low Voltage Upper Threshold Voltage Lower Threshold Voltage Hysteresis Input Logic Voltage LOW (OFF) HIGH (ON) ENABLE Input Pin Current Device set for 5V, VIN=4.5, IOL=250A Device set for 5V (Note 5) Device set for 5V (Note 5) Device set for 5V (Note 5) VIN<10V VEN=16V VEN=0.8V Regulator Output Current in Shutdown Thermal Resistance TO-220 TO-263 (NOTE 6)
A mV mV mV mV V
A
A
Date: 08/25/04
SPX2941 1A Low Dropout Voltage Regulator
(c) Copyright 2004 Sipex Corporation
2
NOTE 1: Dropout voltage is defined as the input to output differential at which the output voltage drops to 99% of its nominal value. NOTE 2: VIN=VOUT(NOMINAL)+1V; for example, 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 and ground currents. 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: 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 = VOUT/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 = 38mV. 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 6: VEN 0.8V and VIN 16V, VOUT = 0. NOTE7: Maximum positive supply voltage of 20V must be of limited duration ( <100ms) and duty cycle (<1%). The maximum continuous supply voltage is 16V. NOTE 8: VREF VOUT (VIN-1), 2.5V VIN 16V, 10 mA IC IFL, TJ < TJMAX.
BLOCK DIAGRAM
IN O.V I LIMIT FLAG + 1.180V Reference 1.240V + ADJ EN Thermal Shutdown 28V R1* OUT
R2*
GND
Figure 2. SP2941 Block Diagram
Date: 08/25/04
SPX2941 1A Low Dropout Voltage Regulator
(c) Copyright 2004 Sipex Corporation
3
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 3. Line Regulation for 3.3V Device
Figure 4. Load Regulation for 3.3V Device
80.0 70.0
300 280
60.0
IGnd (A)
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 5. Ground Current vs Load Current for 3.3V Device Figure 6. Ground Current vs Input Current
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 7. Ground Current vs Load Current in Dropout
Figure 8. Dropout Voltage vs Load Current for 3.3V Device
Date: 08/25/04
SPX2941 1A Low Dropout Voltage Regulator
(c) Copyright 2004 Sipex Corporation
4
TYPICAL PERFORMANCE CHARACTERISTICS
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 9. Ground Current vs Temperature at ILOAD=10mA
Figure 10. 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)
6.40 6.20 6.00 5.80 5.60 5.40 5.20 5.00 -40 -20 0 20 40 60 80
IGnd (mA)
27 26 25 24 23 22 21 20 -40
100
120
-20
0
20
40
60
80
100
120
Temperature (C)
Temperature (C)
Figure 11. Ground Current vs Temperature at ILOAD=500mA
Figure 12. Ground Current vs Temperature in Dropout at ILOAD=750mA
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 13. Ground Current vs Temperature at ILOAD=1.5A
Figure 14. Ground Current vs Temperature in Dropout at ILOAD=1.5A
Date: 08/25/04
SPX2941 1A Low Dropout Voltage Regulator
(c) Copyright 2004 Sipex Corporation
5
TYPICAL PERFORMANCE CHARACTERISTICS
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 = 1.5A CL = 10F
Temperature (C)
Temperature (C)
Figure 15. Dropout Voltage vs Temperature at ILOAD=750mA
Figure 16. Dropout Voltage vs Temperature at ILOAD=1.5A
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)
120
20 15 10 5 0 -40 -20 0 20 40 60 80 3.3V Device VIN = 3.2V IL = 750mA CL = 10F 100
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 17. Enable Current vs Temperature for 3.3V Devices
Figure 18. Enable Threshold vs Temperature for 3.3V Devices
Date: 08/25/04
SPX2941 1A Low Dropout Voltage Regulator
(c) Copyright 2004 Sipex Corporation
6
APPLICATION INFORMATION The SPX2941 incorporates protection against over-current faults, reversed load insertion, over temperature operation, and positive and negative transient voltage. Thermal Considerations Although the SPX2941 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. Since the tab of the device is electrically connected to GND, the tab must be electrically isolated using a thermally conductive spacer, which itself contributes some small additional thermal resistance. Consult heatsink manufacturer for thermal resistance and design of heatsink. TO-220 Design Example: Assume that VIN = 10V, VOUT = 5V, IOUT = 1A, TA = 50C, 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 = 5W, and the junction temperature is calculated as TJ = TA + PD * (HA + CH + JC) or TJ = 50 + 5.0 * (1 + 2 + 3) = 80C. Reliable operation is insured. 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 SPX2941 is required. Typical Application Circuit Figure 18 shows a typical applications circuit for an adjustable output regulator. The values of R1 and R2 set the output voltage value as follows: VOUT = VREF * [1 + (R1/R2)]. For best results, the total series resistance should be small enough to pass a minimum regulator load current of 5 mA. A minimum value of 10k is recommended for R2 with a range between 10k to 47k .
VIN 6.8F +
4 EN 2
SPX2941
3 1
5 + ADJ R1
VOUT 10F
GND
R2
Figure 19. Adjustable Output Linear Regulator
Date: 08/25/04
SPX2941 1A Low Dropout Voltage Regulator
(c) Copyright 2004 Sipex Corporation
7
PACKAGE: 5PIN TO-263
SEATING PLANE
(DATUM A)
A C2
H
E 1 2 3 4 5 L2
(E)
c
E
L1
D1
5X b 4X e
E1
5 PIN TO-263 JEDEC TO-263 (BB) Variation A A1 b c c2 D1 E E1 e H L L1 L2 L3
Dimensions in (mm) MIN .160 0 .020 .015 .045 .270 .380 .245 NOM MAX .067 BSC .575 .070 .625 .110 .066 .070
c
.190 .010 .039 .029 .023 .420 (b)
0-8 L3
L
WITH PLATING
.010 BSC
BASE METAL CONTACT AREA
5 PIN TO-263
Date: 08/25/04 SPX2941 1A Low Dropout Voltage Regulator (c) Copyright 2004 Sipex Corporation
8
PACKAGE: 5PIN TO-220
E E/2
A B
A
SEATING PLANE
Q H1
oP
F
D D1 L1
D CHAMFER OPTIONAL
CC
D
D L
e e1
b
C1 J1
A
5 PIN TO-220
Dimensions in (inches)
MIN NOM MAX
A b C1 D E e e1 F H1 J1 L L1 P Q U V
.160 .015 .014 .560 .385 .385 .062 .045 .234 .090 .540
-
.190 .040 .022 .590 .415 .415 .072 .055 .258 .115 .560 .250 .156 .113 -
.146 .103 -
.30 .24
5 PIN TO-220
Date: 08/25/04
SPX2941 1A Low Dropout Voltage Regulator
(c) Copyright 2004 Sipex Corporation
9
PACKAGE PINOUTS
TO-263-5 Package (T5)
TO-220-5 Package (U5) SPX2941 1) ADJUST 2) Enable 3) GND 4) VIN 5) VOUT
1 234 5
1
2
3
45
Top View
Top View
ORDERING INFORMATION
PART NUMBER .................... ACCURACY ... OUTPUT VOLTAGE ...................... PACKAGE
SPX2941T5 ............................ 3% ........................ Adj ............................. 5 lead TO-263 SPX2941T5/TR ...................... 3% ........................ Adj ............................. 5 lead TO-263 SPX2941U5 ........................... 3% ........................ Adj ............................. 5 lead TO-220
Available in lead free packaging.To order add "-L" suffix to part number. Example: SPX2941T5/TR = standard; SPX2941T5-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: 08/25/04
SPX2941 1A Low Dropout Voltage Regulator
(c) Copyright 2004 Sipex Corporation
10

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