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 1 SPX3940 VIN 6.8µF + 3 2 VOUT + 10µF Figure 1. Fixed Output Linear Regulator. Date: 5/25/04 SPX3940 1A Low Dropout Voltage Regulator 1 © Copyright 2004 Sipex Corporation 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 SPX3940A (1%) MIN MAX SP3940 (2%) UNITS IOUT = 10mA 10mA≤IOUT≤1A, 6V≤VIN≤16V 1.8 1.8 1.782 1.755 1.818 1.845 1.764 1.737 1.836 1.863 V IOUT = 10mA 10mA≤IOUT ≤1A, 6V≤VIN≤16V 2.5 2.5 2.475 2.437 2.525 2.563 2.450 2.412 2.550 2.588 V IOUT = 10mA 10mA≤IOUT ≤1A, 6V≤VIN≤16V 3.3 3.3 3.267 3.217 3.333 3.383 3.234 3.184 3.366 3.416 V IOUT = 10mA 10mA≤IOUT ≤1A, 6V≤VIN≤16V 5.0 5.0 4.950 4.875 5.050 5.125 4.900 4.825 5.100 5.175 V 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 IO=10mA, (VOUT+1V)≤VIN≤16V 0.2 1.0 1.0 % Load Regulation VIN=VOUT+1V, 10mA≤IOUT≤1A 0.3 1.5 1.5 % ∆V ∆T Output Voltage Temperature Coef. 20 100 100 ppm/°C Dropout Voltage (Note 1) IO =100mA 70 200 200 mV (except 1.8V version) IO =1A 280 550 550 Ground Current (Note 3) IO =750mA, VIN=VOUT, + 1V IO =1A 12 18 25 25 IGNDDO Ground Pin Current at Dropout VIN=0.1V less than specified VOUT IOUT= 10mA 1.2 Current Limit VOUT=0V (Note 2) 2.2 Output Noise Voltage (10Hz to 100kHz) IL=100mA CL= 10µF 400 CL=33µF 260 TO-220 Junction to Case, at Tab TO-220 Junction to Ambient 3 60 °C/W TO-263 Junction to Case, at Tab TO-263 Junction to Ambient 3 60 °C/W SOT-223 Junction to Case, at Tab SOT-223 Junction to Ambient 15 150 °C/W Thermal Resistance mA mA 1.5 1.5 A µVRMS 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 2 © Copyright 2004 Sipex Corporation BLOCK DIAGRAM IN OUT O.V I LIMIT Reference 1.240V 28V + R1 Ibias Thermal Shutdown R2 GND TYPICAL PERFORMANCE CHARACTERISTICS 3.310 3.320 3.305 3.315 3.300 3.305 VOUT (V) VOUT (V) 3.310 3.300 3.295 3.290 3.3V Device IL = 10mA CL = 10µF 3.290 3.285 3.295 3.3V Device IL=4.3mA CL=10µF 3.285 3.280 4 6 8 10 12 14 16 3.280 0 VIN (V) 0.25 0.5 0.75 1 1.25 1.5 IL (A) Figure 2. Line Regulation Figure 3. Load Regulation 80.0 100 70.0 95 90 50.0 IGND (µA) IGND (mA) 60.0 40.0 30.0 80 20.0 3.3V Device VIN = 4.3V CL = 10µF 10.0 0.0 85 0 0.25 0.5 0.75 1 1.25 70 -40 1.5 IL (A) -20 0 20 40 60 80 100 120 VIN (V) Figure 4. Ground Current vs Load Current Date: 5/25/04 3.3V Device IL = 10 mA CL = 10µF 75 Figure 5. Ground Current vs Input Voltage SPX3940 1A Low Dropout Voltage Regulator 3 © Copyright 2004 Sipex Corporation TYPICAL PERFORMANCE CHARACTERISTICS 100 600 90 500 70 V Dropout (mV) I GND (mA) 80 60 50 40 3.3 Device VIN = 3.2V CL = 10µF 30 20 0 0.25 0.5 0.75 1 300 200 3.3V Device CL = 10µF 100 10 0 400 1.25 0 1.5 0 0.25 0.5 0.75 IL(A) 280 3.320 270 3.310 260 3.300 250 3.290 240 230 210 3.280 3.270 3.250 3.3V Device VIN = 4.3V IL = 10mA CL = 10µF 200 190 -20 0 20 40 60 80 100 3.3V Device VIN = 4.3V IL = 10mA CL = 10µF 3.240 3.230 3.220 -40 120 -20 0 20 Figure 8. Ground Current vs Temperature at ILOAD = 10mA 60 80 100 120 Figure 9. Output Voltage vs Temperature at ILOAD=10mA 30 7.00 6.80 29 3.3V Device VIN = 4.3V IL = 500mA CL = 10µF 6.40 3.3V Device VIN = 3.2V IL = 750mA CL = 10µF 28 IGND (mA) 6.60 IGND (mA) 40 Temperature (°C) Temperature (°C) 6.20 6.00 5.80 27 26 25 24 5.60 23 5.40 22 5.20 21 -20 0 20 40 60 80 100 20 -40 120 Temperature (°C) -20 0 20 40 60 80 100 120 Temperature (°C) Figure 10. Ground Current vs Temperature at ILOAD=500mA Date: 5/25/04 1.5 3.260 220 5.00 -40 1.25 Figure 7. Dropout Voltage vs Load Current VOUT(V) IGND (µA) Figure 6. Ground Current vs Load Current in Dropout 180 -40 1 IL (A) Figure 11. Ground Current vs Temperature in Dropout at ILOAD=750mA SPX3940 1A Low Dropout Voltage Regulator 4 © Copyright 2004 Sipex Corporation TYPICAL PERFORMANCE CHARACTERISTICS 100 52.0 50.0 95 IGND (mA) 48.0 90 IGND mA) 46.0 44.0 3.3V Device VIN = 4.3V IL=1.5A CL = 10µF 42.0 40.0 38.0 36.0 -40 -20 0 20 40 60 80 100 85 80 3.3V Device VIN = 3.2V IL = 1.5A CL = 10µF 75 70 -40 120 -20 0 20 Temperature (°C) 40 60 80 100 120 Temperature (°C) Figure 12. Ground Current vs Temperature at ILOAD= 1.5A Figure 13. Ground Current vs Temperature in Dropout at ILOAD=1.5A 350 500 330 480 VDROPOUT (mV) VDROPOUT (mV) 310 290 270 250 230 3.3V Device IL = 750mA CL = 10µF 210 190 460 440 420 400 3.3V Device IL = 1.5A CL = 10µF 380 360 340 170 150 -40 -20 0 20 40 60 80 100 320 -40 120 -20 0 20 40 60 Figure 14. Dropout Voltage vs Temperature at ILOAD= 750mA 2.00 30 1.90 3.3V Device VIN = 3.2V IL = 750mA CL = 10µF 1.70 20 1.60 VTH (V) IEN (µA) 1.80 25 15 3.3V Device VIN = 3.2V IL = 750mA CL = 10µF 5 0 -40 -20 0 20 40 60 80 100 1.50 1.40 1.30 1.20 1.10 1.00 -40 120 -20 0 20 40 60 80 100 120 Temperature (°C) Temperature (°C) Figure 16. Enable Current vs Temperature for VEN= 16V Date: 5/25/04 120 Figure 15. Dropout Voltage vs Temperature at ILOAD= 1.5mA 35 10 100 80 Temperature (°C) Temperature (°C) Figure 17. Enable Threshold vs Temperature SPX3940 1A Low Dropout Voltage Regulator 5 © Copyright 2004 Sipex Corporation APPLICATION INFORMATION For example, TO-220 design: Assume that VIN = 10V, VOUT = 5V, IOUT = 1.5A, TA = 50°C/W, θHA= 1°C/W, θCH = 2°C/W, and θJC = 3°C/W. Where TA = ambient temperature θHA = heatsink to ambient thermal resistance θCH = case to heatsink thermal resistance θJC = junction to case thermal resistance 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. The power calculated under these conditions is: PD = (VIN - VOUT) * IOUT = 7.5W. And the junction temperature is calculated as TJ = TA + PD * (θHA + θCH + θJC) or TJ = 50 + 7.5 * (1 + 2 + 3) = 95°C Reliable operation is insured. 1 SPX3940 VIN 6.8µF + 3 VOUT + 2 10µF 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 10µF 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 0.1µF 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 6 © Copyright 2004 Sipex Corporation PACKAGE: TO-263 SEATING PLANE E A E/2 C2 L1 H D 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 A .160 - .190 A1 .000 - .010 b .020 - .039 c .015 - D .330 D1 .270 E E1 .380 - .380 - .420 .245 - - WITH PLATING c .100 BSC H .575 - .625 L .070 - .110 L1 - - .066 L2 - - .070 L3 b .029 - e View C NOM MAX BASE METAL SECTION B-B .010 BSC 3 PIN TO-263 Date: 5/25/04 SPX3940 1A Low Dropout Voltage Regulator 7 © Copyright 2004 Sipex Corporation PACKAGE: 3 PIN TO-220 E A B E/2 E2 SEATING PLANE A øP Q A1 H1 D D1 L1 CHAMFER OPTIONAL 1 D C C D L b e A C e1 A2 Dimensions in (mm) 3 PIN TO-220 JEDEC TO-220 (AB) Variation MIN .140 - .190 A1 .020 - .055 A2 .080 - .115 b .015 .027 .040 b2 .045 - .070 c .014 - .024 D D1 .560 - .650 D2 .330 .480 - .355 .507 E E1 E2 .380 .270 - - .420 .350 .030 b WITH PLATING c BASE METAL CONTACT AREA .100 BSC e e1 Date: 5/25/04 NOM MAX A .200 BSC H1 L1 .230 - .270 - - .250 L2 - - - ∆P Q .139 - .100 - 3 PIN TO-220 .161 .135 SPX3940 1A Low Dropout Voltage Regulator 8 © Copyright 2004 Sipex Corporation PACKAGE: 3 PIN SOT-23 D b B 3 B E1 1 SEE VIEW C E VIEW A-A 2 e Gauge Plane e1 Seating Plane L Ø L1 VIEW C 3 PIN SOT-23 JEDEC TO-236 (AB) Variation Dimensions in (mm) A MIN A 0.89 A1 0.01 A2 NOM MAX - 1.12 - 0.88 0.95 1.02 0.30 - 0.50 c 0.08 - 0.20 2.80 2.90 e 0.95 BSC e1 1.90 BSC E 2.10 A C A1 b WITH PLATING - 2.64 E1 1.30 1.40 L 0.40 0.50 c 0.60 0.54 REF L1 0º - SIDE VIEW 3.04 1.20 Ø Seating Plane 0.10 b D A2 A BASE METAL SECTION B-B 8º 3 PIN SOT-23 Date: 5/25/04 SPX3940 1A Low Dropout Voltage Regulator 9 © Copyright 2004 Sipex Corporation PINOUTS TO-263-3 Package (T) 1 2 TO-220-3 Package (U) SOT-223 (M3) 1 3 1 2 3 2 3 V GND IN V OUT VIN GND VOUT VIN GND VOUT Front View TAB=GND Front View TAB=GND Top View TAB=GND ORDERING INFORMATION PART NUMBER ACC. OUTPUT VOLTAGE PACKAGE SPX3940AU-1.8 1% 1.8V 3 lead TO-220 SPX3940AU-2.5 1% 2.5V 3 lead TO-220 SPX3940AU-3.3 1% 3.3V 3 lead TO-220 SPX3940AU-5.0 1% 5.0V 3 lead TO-220 SPX3940AT-1.8 1% 1.8V 3 lead TO-263 SPX3940AT-1.8/TR 1% 1.8V 3 lead TO-263 SPX3940AT-2.5 1% 2.5V 3 lead TO-263 SPX3940AT-2.5/TR 1% 2.5V 3 lead TO-263 SPX3940AT-3.3 1% 3.3V 3 lead TO-263 SPX3940AT-3.3/TR 1% 3.3V 3 lead TO-263 SPX3940AT-5.0 1% 5.0V 3 lead TO-263 SPX3940AT-5.0/TR 1% 5.0V 3 lead TO-263 SPX3940U-1.8 2% 1.8V 3 lead TO-220 SPX3940U-2.5 2% 2.5V 3 lead TO-220 SPX3940U-3.3 2% 3.3V 3 lead TO-220 SPX3940U-5.0 2% 5.0V 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 10 © Copyright 2004 Sipex Corporation ORDERING INFORMATION PART NUMBER ACC. OUTPUT VOLTAGE PACKAGE SPX3940T-1.8 2% 1.8V 3 lead TO-263 SPX3940T-1.8/TR 2% 1.8V 3 lead TO-263 SPX3940T-2.5 2% 2.5V 3 lead TO-263 SPX3940T-2.5/TR 2% 2.5V 3 lead TO-263 SPX3940T-3.3 2% 3.3V 3 lead TO-263 SPX3940T-3.3/TR 2% 3.3V 3 lead TO-263 SPX3940T-5.0 2% 5.0V 3 lead TO-263 SPX3940T-5.0/TR 2% 5.0V 3 lead TO-263 SPX3940AM3-1.8 1% 1.8V 3 lead SOT-223 SPX3940AM3-1.8/TR 1% 1.8V 3 lead SOT-223 SPX3940AM3-2.5 1% 2.5V 3 lead SOT-223 SPX3940AM3-2.5/TR 1% 2.5V 3 lead SOT-223 SPX3940AM3-3.3 1% 3.3V 3 lead SOT-223 SPX3940AM3-3.3/TR 1% 3.3V 3 lead SOT-223 SPX3940AM3-5.0 1% 5.0V 3 lead SOT-223 SPX3940AM3-5.0/TR 1% 5.0V 3 lead SOT-223 SPX3940M3-1.8 2% 1.8V 3 lead SOT-223 SPX3940M3-1.8/TR 2% 1.8V 3 lead SOT-223 SPX3940M3-2.5 2% 2.5V 3 lead SOT-223 SPX3940M3-2.5/TR 2% 2.5V 3 lead SOT-223 SPX3940M3-3.3 2% 3.3V 3 lead SOT-223 SPX3940M3-3.3/TR 2% 3.3V 3 lead SOT-223 SPX3940M3-5.0 2% 5.0V 3 lead SOT-223 SPX3940M3-5.0/TR 2% 5.0V 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 11 © Copyright 2004 Sipex Corporation