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| (R) 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 Internal Thermal Protection Internal Short Circuit Current Limit Replacement for LM3940 Standard SOT-223, TO-220 and TO-263 packages APPLICATIONS Powering VGA & Sound Card Automotive Electronics LCD Monitors Cordless Telephones Power PCTM Supplies SPX3940 3 Pin TO-263 1 2 3 VIN GND VOUT Now Available in Lead Free Packaging SMPS Post-Regulator Laptop, Palmtop, and Notebook Computer High Efficiency Linear Power Supplies Portable Instrumentation Constant Current Regulators DESCRIPTION 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 dropout voltage and a fast transient response. They are fully fault protected against over-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 VIN 6.8F + 1 SPX3940 2 3 + 10F VOUT Figure 1. Fixed Output Linear Regulator. Date: 5/25/04 SPX3940 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 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 CL=33F 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 0.2 0.3 20 70 280 12 18 1.2 2.2 400 260 3 60 3 60 15 150 C/W C/W C/W 1.5 1.5 1.0 1.5 100 200 550 25 1.0 1.5 100 200 550 25 mA mA A VRMS % % ppm/C mV IOUT = 10mA 10mAIOUT 1A, 6VVIN16V 5.0 5.0 4.950 4.875 5.050 5.125 4.900 4.825 5.100 5.175 V IOUT = 10mA 10mAIOUT 1A, 6VVIN16V 3.3 3.3 3.267 3.217 3.333 3.383 3.234 3.184 3.366 3.416 V IOUT = 10mA 10mAIOUT 1A, 6VVIN16V 2.5 2.5 2.475 2.437 2.525 2.563 2.450 2.412 2.550 2.588 V IOUT = 10mA 10mAIOUT1A, 6VVIN16V 1.8 1.8 1.782 1.755 1.818 1.845 1.764 1.737 1.836 1.863 V CONDITIONS TYP MIN MAX SPX3940A (1%) MIN MAX SP3940 (2%) UNITS 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 SPX3940 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 3.310 3.320 3.315 3.310 3.305 3.300 VOUT (V) VOUT (V) 3.305 3.300 3.295 3.290 3.285 3.280 4 6 8 10 VIN (V) 12 14 16 3.3V Device IL = 10mA CL = 10F 3.295 3.290 3.285 3.280 0 0.25 0.5 0.75 IL (A) 1 1.25 1.5 3.3V Device IL=4.3mA CL=10F Figure 2. Line Regulation Figure 3. Load Regulation 80.0 70.0 60.0 IGND (mA) IGND (A) 100 95 90 85 80 3.3V Device IL = 10 mA CL = 10F 50.0 40.0 30.0 20.0 10.0 0.0 0 0.25 0.5 0.75 1 3.3V Device VIN = 4.3V CL = 10F 1.25 1.5 75 70 -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 (c) Copyright 2004 Sipex Corporation 3 TYPICAL PERFORMANCE CHARACTERISTICS 100 90 80 V Dropout (mV) 600 500 400 300 200 100 3.3V Device CL = 10F I GND (mA) 70 60 50 40 30 20 10 0 0 0.25 0.5 0.75 1 1.25 1.5 3.3 Device VIN = 3.2V CL = 10F 0 0 0.25 0.5 0.75 IL (A) 1 1.25 1.5 IL(A) Figure 6. Ground Current vs Load Current in Dropout Figure 7. Dropout Voltage vs Load Current 280 270 260 250 VOUT(V) 3.320 3.310 3.300 3.290 3.280 3.270 3.260 3.250 3.240 3.230 3.220 -40 3.3V Device VIN = 4.3V IL = 10mA CL = 10F -20 0 20 40 60 80 100 120 IGND (A) 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 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 IGND (mA) 6.40 6.20 6.00 5.80 5.60 5.40 5.20 5.00 -40 -20 0 20 40 60 80 100 120 3.3V Device VIN = 4.3V IL = 500mA CL = 10F 30 29 28 IGND (mA) 27 26 25 24 23 22 21 20 -40 -20 0 20 40 60 80 3.3V Device VIN = 3.2V IL = 750mA CL = 10F 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 (c) Copyright 2004 Sipex Corporation 4 TYPICAL PERFORMANCE CHARACTERISTICS 52.0 50.0 48.0 100 95 90 IGND mA) IGND (mA) 46.0 44.0 42.0 40.0 38.0 36.0 -40 -20 0 20 40 60 3.3V Device VIN = 4.3V IL=1.5A CL = 10F 80 100 120 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 = 1.5A 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) 20 VTH (V) 1.50 1.40 1.30 1.20 1.10 1.00 -40 15 10 5 0 -40 -20 0 20 40 60 80 3.3V Device VIN = 3.2V IL = 750mA CL = 10F 100 120 -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 SPX3940 1A Low Dropout Voltage Regulator (c) Copyright 2004 Sipex Corporation 5 APPLICATION INFORMATION The SPX3940 incorporates protection against over-current faults, reversed load insertion, over temperature operation, and positive and negative transient voltage. Thermal Considerations 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 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 SPX3940 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 SPX3940 is required. Date: 5/25/04 SPX3940 1A Low Dropout Voltage Regulator (c) Copyright 2004 Sipex Corporation 6 PACKAGE: 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 SPX3940 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 SPX3940 1A Low Dropout Voltage Regulator (c) Copyright 2004 Sipex Corporation 8 PACKAGE: 3 PIN SOT-23 D b 3 B B E1 E SEE VIEW C VIEW A-A 1 e 2 e1 L L1 Gauge Plane Seating Plane O VIEW C 3 PIN SOT-23 JEDEC TO-236 (AB) Variation A A1 A2 b c D e e1 E E1 L L1 O 0 2.10 1.20 0.40 Dimensions in (mm) A MIN 0.89 0.01 0.88 0.30 0.08 2.80 NOM MAX 0.95 2.90 1.12 0.10 1.02 0.50 0.20 3.04 A A1 A A2 Seating Plane C SIDE VIEW b WITH PLATING 0.95 BSC 1.90 BSC 1.30 0.50 0.54 REF 8 2.64 1.40 0.60 c BASE METAL SECTION B-B 3 PIN SOT-23 Date: 5/25/04 SPX3940 1A Low Dropout Voltage Regulator (c) Copyright 2004 Sipex Corporation 9 PINOUTS TO-263-3 Package (T) TO-220-3 Package (U) SOT-223 (M3) 1 2 3 1 1 23 2 3 V VIN GND VOUT VIN GND VOUT Front View TAB=GND Front View TAB=GND IN GND V OUT 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 SPX3940U-2.5 SPX3940U-3.3 SPX3940U-5.0 ACC. 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 2% 2% 2% 2% OUTPUT VOLTAGE 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 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 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 (c) Copyright 2004 Sipex Corporation 10 ORDERING INFORMATION PART NUMBER SPX3940T-1.8 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 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 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 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 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 (c) Copyright 2004 Sipex Corporation 11 |
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