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 SPX2940 3 Pin TO-263 1 VIN 3 GND VOUT Now Available in Lead Free Packaging ■ ■ ■ ■ ■ ■ APPLICATIONS ■ Powering VGA & Sound Card ■ LCD Monitors ■ USB Power Supply ■ Power PCTM Supplies ■ SMPS Post-Regulator 2 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 1 SPX2940 VIN 6.8µF + 3 VOUT + 2 10µF Figure 1. Fixed Output Linear Regulator. Date: 5/25/04 SPX2940 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 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 TYP MIN IOUT = 10mA 10mA≤IOUT≤1A, 6V≤VIN≤16V 1.8 1.8 1.746 1.710 1.854 1.890 V IOUT = 10mA 10mA≤IOUT ≤1A, 6V≤VIN≤16V 2.5 2.5 2.425 2.375 2.575 2.625 V IOUT = 10mA 10mA≤IOUT ≤1A, 6V≤VIN≤16V 3.3 3.3 3.201 3.135 3.399 3.465 V IOUT = 10mA 10mA≤IOUT ≤1A, 6V≤VIN≤16V 5.0 5.0 4.850 4.750 5.150 5.250 V IO=10mA, (VOUT+1V)≤VIN≤16V VIN=VOUT+1V, 10mA≤IOUT≤1A 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= 10µF 0.2 0.3 20 1.0 1.5 100 % % ppm/°C 70 280 12 18 1.2 200 550 25 mV 2.2 400 CL=33µF 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 MAX UNITS mA mA 1.5 A µVRMS °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 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 3.320 3.310 3.315 3.305 3.305 VOUT (V) VOUT (V) 3.310 3.300 3.295 3.3V Device IL = 10mA CL = 10µF 3.290 3.285 6 8 10 12 14 3.295 3.290 3.3V Device VIN = 4.3V CL = 10µF 3.285 3.280 0.00 3.280 4 3.300 16 0.25 0.50 0.75 Figure 2. Line Regulation 280 IGnd (mA) 60.0 IGnd (mA) 1.50 300 70.0 50.0 40.0 30.0 260 240 220 20.0 3.3V Device VIN = 4.3V CL = 10µF 10.0 3.3V Device IL = 10mA CL = 10µF 200 180 0.25 0.50 0.75 1.00 1.25 4 1.50 6 8 10 12 14 16 VIN (V) IL (A) Figure 4. Ground Current vs Load Current Date: 5/25/04 1.25 Figure 3. Load Regulation 80.0 0.0 0.00 1.00 IL (A) VIN (V) Figure 5. Ground Current vs Input Voltage SPX2940 1A Low Dropout Voltage Regulator 3 © Copyright 2004 Sipex Corporation TYPICAL PERFORMANCE CHARACTERISTICS 100 600 90 500 VDROPOUT (mV) 80 IGnd (mA) 70 60 50 40 30 3.3V Device VIN = 3.2V CL = 10µF 20 10 0 0.00 0.25 0.50 0.75 1.00 1.25 400 300 200 3.3V Device CL = 10µF 100 0 0.00 1.50 0.25 0.50 IL (A) 280 3.320 270 3.310 260 3.300 250 3.290 240 230 220 3.3V Device VIN = 4.3V IL = 10mA CL = 10µF 210 200 190 -20 0 20 40 60 100 80 3.260 3.3V Device VIN = 4.3V IL = 10mA CL = 10µF 3.240 3.230 3.220 -40 120 -20 0 20 40 60 100 80 120 Temperature (°C) Figure 9. Output Voltage vs Temperature at ILOAD=10mA 30 7.00 29 6.80 3.3V Device VIN = 4.3V IL = 500mA CL = 10µF 6.40 6.20 3.3V Device VIN = 3.2V IL = 750mA CL = 10µF 28 IGnd (mA) 6.60 IGnd (mA) 1.50 3.270 3.250 Figure 8. Ground Current vs Temperature at ILOAD = 10mA 6.00 5.80 27 26 25 24 5.60 23 5.40 22 21 5.20 -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 1.25 3.280 Temperature (°C) 5.00 -40 1.00 Figure 7. Dropout Voltage vs Load Current VOUT (V) IGnd (µA) Figure 6. Ground Current vs Current in Dropout 180 -40 0.75 IL (A) Figure 11. Ground Current vs Temperature in Dropout at ILOAD=750mA SPX2940 1A Low Dropout Voltage Regulator 4 © Copyright 2004 Sipex Corporation TYPICAL PERFORMANCE CHARACTERISTICS 100 52.0 95 48.0 IGnd (mA) IGnd (mA) 50.0 46.0 44.0 42.0 3.3V Device VIN = 4.3V IL = 1.5A CL = 10µF 40.0 38.0 36.0 -40 -20 0 20 40 60 100 80 90 85 80 75 70 -40 120 3.3V Device VIN = 3.2V IL = 1.5A CL = 10µF -20 0 Figure 12. Ground Current vs Temperature at ILOAD= 1.5A 60 VDROPOUT (mV) 290 270 250 230 3.3V Device IL = 750mA CL = 10µF 210 190 170 460 440 420 400 3.3V Device IL = 750A CL = 10µF 380 360 340 -20 0 20 40 60 100 80 320 -40 120 -20 0 20 40 60 Figure 14. Dropout Voltage vs Temperature at ILOAD= 750mA 120 Figure 15. Dropout Voltage vs Temperature at ILOAD= 1.5mA 35 2.00 1.90 30 3.3V Device VIN = 3.2V IL = 750mA CL = 10µF 1.80 25 1.70 20 1.60 VTH (V) IEN (µA) 100 80 Temperature (°C) Temperature (°C) 15 10 3.3V Device VIN = 3.2V IL = 750mA CL = 10µF 5 -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: 5/25/04 120 480 310 0 -40 100 80 500 330 VDROPOUT (mV) 40 Figure 13. Ground Current vs Temperature in Dropout at ILOAD=1.5A 350 150 -40 20 Temperature (°C) Temperature (°C) Figure 17. Enable Threshold vs Temperature SPX2940 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 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. 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 SPX2940 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 SPX2940 is required. Date: 5/25/04 SPX2940 1A Low Dropout Voltage Regulator 6 © Copyright 2004 Sipex Corporation PACKAGE: 3 PIN 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 SPX2940 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 SPX2940 1A Low Dropout Voltage Regulator 8 © Copyright 2004 Sipex Corporation PACKAGE PINOUTS TO-263-3 Package (T) 1 2 TO-220-3 Package (U) 3 1 2 3 VIN GND VOUT VIN GND VOUT Front View TAB = GND Front View TAB = GND ORDERING INFORMATION PART NUMBER 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 ACC. OUTPUT VOLTAGE 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 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 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 9 © Copyright 2004 Sipex Corporation