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| Solved by SPX2941 TM 1A Low Dropout Voltage Regulator Adjustable Output, Fast Response 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 Standard TO-220 and TO-263 packages SPX2941 5 Pin TO-263 12345 ADJUST ENABLE GND VIN 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. 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 5 + ADJ R1 VOUT 10 F VIN 4 6.8 F + EN 2 SPX2941 3 1 GND R2 Figure 1. Adjustable Output Linear Regulator Date: Sept 28-06 Rev E SPX294 A Low Dropout Linear Regulator (c) 2006 Sipex Corporation VOUT 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 (NOTE6) .... .....................................16V ELECTRICAL CHARACTERISTICS VIN=VOUT+ 1V, I OUT=10mA, CIN=6.8 F, COUT=10 F, TA= 25 C, 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) Ground Pin Current at Dropout Current Limit Output Noise Voltage (NOTE4) CONDITIONS Adjustable version only MIN. 1.228 1.215 TYP. 1.240 40 20 0.1 IOUT=10mA, (VOUT+1V) VIN 16V VIN=VOUT+1V, 10mA IOUT IFULL IOUT=100mA IOUT=1A IOUT=750mA, VIN=VOUT+1V IOUT=1A VIN=0.1V less than specified VOUT, IOUT=10mA VOUT=0V (Note2) 10Hz to 100kHz, IOUT =100mA, CL=10 F CL=33 F Input Logic Voltage VIN<10V VEN=16V VEN=0.8V Regulator Output Current in Shutdown Thermal Resistance TO-220 TO-263 (NOTE5) 10 0.2 0.3 70 280 12 18 1.2 1.5 2.2 400 260 0.8 100 600 750 1 2 500 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 V A A A LOW (OFF) HIGH (ON) ENABLE Input Pin Current 2.4 Junction to Case, at Tab Junction to Ambient 3 29.3 C/W Junction to Case, at Tab 3 C/W Junction to Ambient 31.2 NOTE1: Dropout voltage is defined as the input to output differential at which the output voltage drops to 99% of its nominal value. NOTE2: V IN=VOUT(NOMINAL)+1V; for example, VIN=4.3V for a 3.3V regulator. Employ pulse-testing procedures to minimize temperature rise. NOTE3: Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum of the load and ground currents. NOTE4: 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. NOTE5: V EN 0.8V and V IN 16V, V OUT= 0. NOTE6: Maximum positive supply voltage of 20V must be of limited duration ( <100ms) and duty cycle (<1%). The maximum continuous supply voltage is 16V. NOTE7: V REF V OUT (V IN-1), 2.5V V IN 16V, 10 mA I C I FL, TJ < TJMAX. Date: Sept 28-06 Rev E SPX294 A Low Dropout Linear Regulator (c) 2006 Sipex Corporation 2 BLOCK DIAGRAM IN O.V I LIMIT Reference 1.240V + 28V R1* OUT ADJ EN Thermal Shutdown R2* GND Figure 2. SPX2941 Block Diagram 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 Note: Tab is internally connected to GND ORDERING INFORMATION Date: Sept 28-06 Rev E (c) PART NUMBER ....................SPX294 A Low Dropout Linear Regulator ACCURACY ... OUTPUT VOLTAGE ...................... 2006 Sipex Corporation PACKAGE SPX2941T5 ............................ 3% ........................ Adj ............................. 5 lead TO-263 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 3.3V Device IL = 10mA CL = 10 F 14 16 VOUT (V) 3.305 3.3V Device VIN= 4.3V CL = 10 F 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 60.0 300 280 IGnd ( A) IGnd (mA) 50.0 40.0 30.0 20.0 10.0 0.0 0.00 0.25 0.50 0.75 1.00 260 240 220 3.3V Device VIN= 4.3V CL = 10 F 1.25 1.50 200 180 3.3V Device IL = 10mA CL = 10 F 4 6 8 10 12 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 70 80 600 500 VDROPOUT (mV) 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 = 10 F 1.25 1.50 3.3V Device CL = 10 F 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 Date: Sept 28-06 Rev E Figure 8. Dropout Voltage vs Load Current for 3.3V Device (c) 2006 Sipex Corporation SPX294 A Low Dropout Linear Regulator 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 = 10 F 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 = 10 F 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 = 10 F 30 29 28 3.3V Device VIN= 3.2V IL = 750mA CL = 10 F IGnd (mA) 6.20 6.00 5.80 5.60 5.40 5.20 5.00 -40 -20 0 20 40 60 80 IGnd (mA) 6.40 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 = 10 F 100 120 90 85 80 75 70 -40 3.3V Device VIN= 3.2V IL = 1.5A CL = 10 F -20 0 20 40 60 80 100 120 Temperature (C) Temperature (C) Figure 13. Ground Current vs Temperature at ILOAD=1.5A Date: Sept 28-06 Rev E Figure 14. Ground Current vs Temperature in Dropout at ILOAD=1.5A (c) 2006 Sipex Corporation SPX294 A Low Dropout Linear Regulator TYPICAL PERFORMANCE CHARACTERISTICS 350 330 310 500 480 460 440 420 400 380 360 340 -20 0 20 40 60 80 100 120 320 -40 -20 0 20 40 60 80 100 120 3.3V Device IL = 1.5A CL = 10 F VDROPOUT (mV) 270 250 230 210 190 170 150 -40 3.3V Device IL = 750mA CL = 10 F Temperature (C) VDROPOUT (mV) 290 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 = 10 F IEN ( A) 15 10 5 0 -40 -20 0 20 40 60 80 3.3V Device VIN= 3.2V IL = 750mA CL = 10 F 100 120 VTH (V) 20 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: Sept 28-06 Rev E SPX294 A Low Dropout Linear Regulator (c) 2006 Sipex Corporation 6 APPLICATION INFORMATION The SPX294 incorporates protection against over-current faults, reversed load insertion, over temperature operation, and positive and negative transient voltage. Thermal Considerations Although the SPX294 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. The tab of the device is electrically connected to GND. 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. Power dissipation is calculated as follows: PD = (VIN -VOUT)*(IOUT) Maximum Junction Temperature range: TJ = TA(max) + PD* JA (thermal resistance, junction-to-ambient) Maximum junction temperature must not exceed 2C. 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 Date: Sept 28-06 Rev E 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 mA for SPX294 is required. Typical Application Circuit Figure 19 shows a typical applications circuit for an adjustable output regulator. The values of R and R2 set the output voltage value as follows: VOUT = VREF * [ + (R/R2)]. A minimum value of 10k is recommended for R2 with a range between 10k to 47k. VIN 6.8F 4 2 + EN SPX2941 3 1 5 GND ADJ R1 + 10F VOUT R2 Figure 19. Adjustable Output Linear Regulator (c) 2006 Sipex Corporation SPX294 A Low Dropout Linear Regulator PACKAGe: 5 PIN TO-263 Date: Sept 28-06 Rev E SPX294 A Low Dropout Linear Regulator (c) 2006 Sipex Corporation 8 PACKAGe: 5 PIN TO-220 Date: Sept 28-06 Rev E SPX294 A Low Dropout Linear Regulator (c) 2006 Sipex Corporation 9 Note: Tab is internally connected to GND 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-263-5. Solved by Sipex Corporation TM Headquarters and Sales Office 2 South Hillview Drive Milpitas, CA 90 TEL: (408) 94-00 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: Sept 28-06 Rev E SPX294 A Low Dropout Linear Regulator (c) 2006 Sipex Corporation 0 |
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