SPX2810 ® 1A Low Dropout Positive Linear Regulator FEATURES ■ Guaranteed 1A Output ■ Three Terminal Adjustable or Fixed 2.5V, 3.0V and 3.3V ■ Low Quiescent Current ■ Low Dropout Voltage of 1.1V at Full Load ■ 0.2% Line and 0.3% Load Regulation ■ Voltage Temperature Stability 0.25% ■ Overcurrent and Thermal Protection ■ Available Packages: SOT-223,TO-252, TO-220, and TO-263 APPLICATIONS ■ SCSI-II Active Terminator ■ Portable/Palm Top/Notebook Computers ■ Battery Chargers SPX2810 3 Pin TO-263 1 2 3 ADJ/GND VOUT VIN Now Available in Lead Free Packaging SPX2810 is 2% Accuracy SPX2810A is 1% Accuracy ■ ■ ■ ■ Disk Drives Portable Consumer Equipment Portable Instrumentation SMPS Post-Regulator DESCRIPTION The SPX2810 is a low power positive-voltage regulator designed to satisfy moderate power requirements with a cost effective, small footprint solution. This device is an excellent choice for use in battery-powered applications and portable computers. The SPX2810 has a very low quiescent current and a low dropout voltage of 1.1V at full load. As output current decreases, quiescent current flows into the load, increasing efficiency. SPX2810 is available in adjustable or fixed 2.5V, 3.0V and 3.3V output voltages. The SPX2810 is offered in several industry standard 3-pin surface mount packages: SOT-223, TO-252, TO-220 and TO-263. An output capacitor of 10µF or larger, provides unconditionally stability for most applications. TYPICAL APPLICATION CIRCUITS VIN IN 4.7µF + SPX2810 VOUT OUT C2 C1 ADJ I ADJ 50µA VREF VOUT = V REF (1+R 2 /R1 ) +I ADJ R 2 Date: 5/25/04 SPX2810 1A Low Dropout Linear Regulator 1 R1 R2 © Copyright 2004 Sipex Corporation ABSOLUTE MAXIMUM RATINGS Lead Temperature (soldering, 5 seconds) .................. 300°C Storage Temperature Range ...................... -65°C to +150°C Operating Junction Temperature Range ..... -40°C to +125°C Input Supply Voltage ..................................................... +10V ELECTRICAL CHARACTERISITCS VIN=VOUT + 1.5V, COUT = 10µF, at IOUT = 10mA, TA = 25°C, unless otherwise specified. Limits in Boldface applies over the full operating temperature range. SPX2810A PARAMETER CONDITIONS SPX2810 MIN TYP MAX MIN TYP MAX UNITS 0 ≤ IOUT = 1A, 4.0V ≤ VIN ≤ 10V 2.475 2.450 2.500 2.525 2.550 2.450 2.425 2.500 2.550 2.575 V 0 ≤ IOUT = 1A, 4.5V ≤ VIN ≤ 10V 2.970 2.940 3.000 3.030 3.060 2.940 2.790 3.000 3.060 3.090 V 0 ≤ IOUT = 1A, 4.8V ≤ VIN ≤ 10V 3.267 3.234 3.300 3.333 3.366 3.234 3.069 3.300 3.366 3.399 V Reference Voltage IOUT=10mA, VIN = VOUT +3V 10≤IOUT≤ 1A, 1.5V≤(VIN-VOUT)≤ 5.75V 1.238 1.225 1.250 1.263 1.281 1.225 1.212 1.250 1.275 1.288 V Min Load Current (Note 3) 1.5≤(VIN - VOUT)≤5.75V 5 10 10 mA Line Regulation 2.75≤VIN≤ 7V, IOUT=TJ=25°C (Note 2) 0.005 0.2 0.005 0.2 % Load Regulation (VIN - VOUT)=3.0V, 10mA≤IOUT≤ 1A, TJ=25°C (Note 3) 0.05 0.3 0.05 0.2 % Dropout Voltage (Note 2) IOUT=1A (Note 3) IOUT=1A (Note 2) 1.1 1.05 1.2 1.15 1.1 1.2 V 1.0 % 0.02 %/Ω 2.5V Version Output Voltage (Note 2) 3.0V Version Output Voltage (Note 2) 3.3V Version Output Voltage (Note 2) All Output Options Current Limit VIN=7V,1.4≤(VIN-VOUT)(Note 3) Long Term Stability TA=25°C, 1000Hrs (Note2) 1.2 2.0 1.2 Thermal Regulation 25°C, 20mS Pulse 0.01 RMS Output Noise TA=25°C, 10Hz≤f≤10kHz 0.003 Thermal Resistance TO-220 Junction to Tab TO-220 Junction to Ambient 3.0 60 3.0 60 °C/W TO-220 Junction to Tab TO-220 Juinction to Ambient 3.0 60 3.0 60 °C/W TO-220 Junction to Tab TO-220 Junction to Ambient 6 126 6 126 °C/W °C/W SOT-223 Junction Tab TO-220 Junction to Ambient 15 156 15 156 °CW °C/W 0.03 0.02 1.0 0.01 A 0.003 % NOTES: Note 1: Output temperature coefficient is defined as the worst case voltage change divided by the total temperature range. Note 2: Dropout voltage is defined as the input to output differential at which the output voltage drops 100mV below its nominal value measured at 1V differential at very low values of programmed output voltage, the minimum input supply voltage of 2V ( 2.3V over temperature) must be taken into account. Note 3: Thermal regulation is defined as the change in output voltage at a time T after a change in power dissipation is applied excluding load or line regulation effect. Date: 5/25/04 SPX2810 1A Low Dropout Linear Regulator 2 © Copyright 2004 Sipex Corporation 3.320 3.315 3.310 3.305 3.300 3.295 3.290 3.285 3.280 Line Regulation at 25°C Series 1 Series 2 3.330 Vout (V) Output Voltage (V) TYPICAL PERFORMANCE CHARACTERISTICS 3.320 3.310 3.300 10 100 4.8 1000 9.8 14.8 Vin (V) Output Current (A) Figure 1. Load Regulation for SPX2810M3-3.3; VIN=4.8V, COUT=2.2µF Figure 2. Line Regulation for SPX2810M3--3.3; VIN=4.8V, COUT=2.2µF 1.3 Current Limit (A) Dropout Voltage (V) Current Limit VS Temp 2.00 1.2 1.1 1.0 Series 1 Series 2 1.50 1.00 0.50 0.9 100 200 300 400 500 600 700 800 900 0.00 -50 1000 Output Current (mA) -25 0 25 50 75 100 125 Temp (°C) Output Devation (mV) Figure 3. Dropout Voltage vs Output Current for SPX2810M3-3.3; VIN=4.89V, COUT=10µF Figure 4. Current Limit for SP1202M3-3.3; VIN=4.8V, CIN=COUT=1.0µF, IOUT pulsed from 10mA to Current Limit 125°C 22µF 100 0 Indicating Current Limit Starts -100 Output Current (A) 15 10 V = 4.0V V =3.3V Fixed 1 =10mA C =1µF Ten Cap C =2.2µF Ten Cap IN 0.5 IN O IN 0 OUT 0 0.1 0.2 0.3 0.4 0.5 0.6 Time (ms) 0.7 0.8 0.9 1.0 Figure 5. Current Limit for SPX2810M3-3.3, Output Voltage Deviation, (IOUT pulsed from 10mA to 1A). Date: 5/25/04 SPX2810 1A Low Dropout Linear Regulator 3 © Copyright 2004 Sipex Corporation APPLICATION INFORMATION Output Capacitor To ensure the stability of the SPX1202, an output capacitor of at least 10µF (tantalum or ceramic) or 50µF (aluminum) is required. The value may change based on the application requirements of the output load or temperature range. The value of ESR can vary based on the type of capacitor used in the applications. The recommended value for ESR is 0.5Ω or less. A larger value of output capacitance (up to 100µF) can improve the load transient response. 50 X 50mm 35 X 17mm 16 X 10mm Figure 7. Substrate Layout for SOT-223 for thermal experiment. SOLDERING METHODS The SPX2810 SOT-223 package is designed to be compatible with infrared reflow or vaporphase reflow soldering techniques. During soldering, the non-active or mildly active fluxes may be used. The SPX2810 die is attached to the heatsink lead which exits opposite the input, output, and ground pins. The thermal interaction from other components in the application can effect the thermal resistance of the SPX2810. The actual thermal resistance can be determined with experimentation. SPX2810 power dissipation is calculated as follows: PD = (VIN - VOUT)(IOUT) Maximum Junction Temperature range: Hand soldering and wave soldering should be avoided since these methods can cause damage to the device with excessive thermal gradients on the package. The SOT-223 recommended soldering method are as follows: vapor phase reflow and infrared reflow with the component preheated to within 65°C of the soldering temperature range. TJ = TAMBIENT (max) + PD* (Junction to ambient Thermal Resistance) Although the SPX2810 offers some limiting circuitry for overload conditions, it is still necessary to insure that maximum junction tepmerature is not exceeded. Heat will flow through the lowest resistance path, in this case the junction to case. Therfore proper mounting of the regulator to the board is critical. The case of the device is electrically connected to the output. If the case must be electrically isolated, a thermal nonconductive spacer should be used between the case and the board. It thermal resistance must be taken into account. THERMAL CHARACTERISTICS The thermal resistance of SPX2810 depends on type of package and PC board layout as shown in Table 1. The SPX2810 features the internal thermal limiting to protect the device during overload conditions. Special care needs to be taken during continuous load conditions such that the maximum junction temperature does not exceed 125°C. Thermal protection is activated at >144°C and deactiviated at <137°C. For example: VIN =10V, VOUT =5V. IOUT =1.5A and TA =50°C/W ThetaJC=3°C/W, thetaSinkCase= 6°C/W thetaSink=0.5°C/W Power dissipation is calculated as PD= (VIN-VOUT)* IOUT=7.5W Taking the FR-4 printed circuit board and 1/16 thick with 1 ounce copper foil as an experiment, the PCB material is effective at transmitting heat with the tab attached to the pad area and a ground plane layer on the backside of the substrate. Refer to table 1 for the results of the experiment. Date: 5/25/04 Junction Temperature will be TJ=TA + PD*(thetaCase-Hs +thetaHs + thetaJc) or TJ = 50 + 7.5(0.5+6+3) = 121.25°C SPX2810 1A Low Dropout Linear Regulator 4 © Copyright 2004 Sipex Corporation If an ADJ-bypass capacitor is used, the amplitude of the output ripple will be independent of the output voltage. If an ADJbypass capacitor is not used, the output ripple will be proportional to the ratio of the output voltage to the reference voltage: Ripple Rejection Ripple rejection can be improved by adding a capacitor between the ADJ pin and ground as shown in Figure 6. When ADJ pin bypassing is used, the value of the output capacitor required increases to its maximum. If the ADJ pin is not bypassed, the value of the output capacitor can be lowered to 10(F for an electrolytic aluminum capacitor or 2.2µF for a solid tantalum capacitor (Fig 10). However the value of the ADJ-bypass capacitor should be chosen with respectto the following equation: M = VOUT / VREF Where M = multiplier for the ripple seen when the ADJ pin is optimally bypassed. C = 1 / ( 6.28 * FR * R1 ) VREF =1.25V Where C = value of the capacitor in Farads (select an equal or larger standard value), FR= ripple frequency in Hz, R1= value of resistor R1 in Ohms PC BOARD AREA mm2 TOPSIDE COPPER AREA mm2 2500 2500 2500 2500 2500 1600 2500 2500 1600 900 900 2500 1250 950 2500 1800 600 1250 915 600 240 240 BACKSIDE COPPER AREA mm2 THERMAL RESISTANCE JUNCTION TO AMBIENT °C/W 2500 2500 2500 0 0 1600 0 0 0 900 0 46 47 49 51 53 55 58 59 67 72 85 TYPICAL APPLICATION CIRCUITS V IN IN 4.7µF + SPX2810 VIN OUT C1 IN 4.7µF + C2 R1 VREF VREF IOUT VOUT = V REF (1+R 2 /R1 ) +I ADJ R 2 LOAD R1 R2 R1 Figure 8. 600mA Current Source Date: 5/25/04 VOUT OUT C2 ADJ I ADJ 50µA ADJ IOUT = SPX2810 C1 Figure 9. Typical Adjustable Regulator SPX2810 1A Low Dropout Linear Regulator 5 © Copyright 2004 Sipex Corporation SPX2810 SPX2810 (Note A) V IN IN 5V V IN (Note A) VOUT OUT + 4.7µF ADJ + Note A: VIN(MIN) = (Intended VOUT ) + (V + + 4.7µF 10µF R2 330Ω 1% 5V 1kΩ 1% ADJ R1 1kΩ, 1% *C 1 improves ripple rejection. ZC should be ~ R1 at ripple frequency OUT IN C1 10µF* 2N3904 1k DROPOUT (MAX) ) 10µF 1k TTL Input 330Ω 1% Note A: VIN(MIN) = (Intended VOUT ) + (VDROPOUT (MAX) ) Figure 10. Improving Ripple Rejection Figure 11. 12.5V Regulator with Shutdown Output Voltage The output of the adjustable regulator can be set to any voltage between 1.25V and 10V. The value of VOUT can be quickly approximated using the formula (Figure 9) VOUT=1.25 *(R1 + R2)/R1. A small correction to this formula is required depending on the values of resistors R1 and R2, since adjustable pin current (approx 50µA) flows through R2. When IADJ is taken into account, the formula becomes VOUT = VREF(1+ (R2/R1)) + IADJ * R2, where VREF=1.25V. Layout Considerations Parasitic line resistance can degrade load regulation. In order not to affect the behavior of the regulator, it is best to connect R1 to the case as illustrated in Figure 11. For the same reason, R2 should be connected to the negative side of the load. R P Parasitic Line Resistance V IN V OUT SPX2810 Connect R 1 to Case of Regulator ADJ R1 RL R2 Connect R 2 to Load Figure 12. Recommended Connections for Best Results Date: 5/25/04 SPX2810 1A Low Dropout Linear Regulator 6 © Copyright 2004 Sipex Corporation PACKAGE: PINOUTS SOT-223 (M3) 1 2 TO-220-3 (U) TO-252 (R) 3 1 2 3 V OUT 2 1 1 ADJ/GND TO-263-3 (T) 2 3 3 V IN Top View ADJ/GND V V IN OUT ADJ/GND Front View ADJ/GND V OUT V IN Top View V OUT V IN Front View BLOCK DIAGRAM VIN + Current Limit VOUT ICL AMP VREF Thermal Limit ADJ/GND IADJ ~ –50µA I TL Date: 5/25/04 SPX2810 1A Low Dropout Linear Regulator 7 © Copyright 2004 Sipex Corporation PACKAGE: 3 PIN SOT-223 C D C b2 C N E See detail A E1 A A1 H 1 B B GAUGE PLANE e b SEATING PLANE L 0 C 3 PIN SOT-223 JEDEC TO-261 (AA) Variation A - - 1.80 - 0.10 A2 1.50 1.60 1.70 b 0.66 0.76 0.84 b2 2.90 3.00 3.10 c 0.23 0.30 0.35 D 6.30 6.50 6.70 E 6.70 7.00 7.30 E1 3.30 3.50 3.70 e 2.30 BASIC e1 4.60 BASIC 0.75 0º WITH PLATING NOM MAX 0.02 L Date: 5/25/04 MIN A1 ø b Dimensions in (mm) - c Section B-B BASE METAL c b2 Section C-C - 10º 3 PIN SOT-223 SPX2810 1A Low Dropout Linear Regulator 8 © Copyright 2004 Sipex Corporation PACKAGE: 3 PIN TO-252 GAUGE PLANE L2 c C c L O SEATING PLANE A1 (L1) b E1 WITH PLATING E1/2 c D1 BASE METAL CONTACT AREA 3 PIN TO-252 JEDEC TO-252 (AA) Variation MIN A1 - c .018 D1 E1 Date: 5/25/04 Dimensions in inches NOM MAX - .205 .170 H .370 L .055 .005 - .024 - - - - .410 .060 .070 L1 .108 REF L2 .020 BSC 3 PIN TO-252 SPX2810 1A Low Dropout Linear Regulator 9 © 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 SPX2810 1A Low Dropout Linear Regulator 10 © 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 - .029 D .330 - .380 D1 .270 E E1 - - .380 - .420 .245 - - e b WITH PLATING c .100 BSC H .575 - .625 L .070 - .110 L1 - - .066 L2 - - .070 L3 View C NOM MAX BASE METAL SECTION B-B .010 BSC 3 PIN TO-263 Date: 5/25/04 SPX2810 1A Low Dropout Linear Regulator 11 © Copyright 2004 Sipex Corporation ORDERING INFORMATION Part Number Accuracy SPX2810AM3 ............................................... SPX2810AM3/TR ........................................ SPX2810AM3-2.5 ........................................ SPX2810AM3-2.5/TR ................................. SPX2810AM3-3.0 ........................................ SPX2810AM3-3.0/TR ................................. SPX2810AM3-3.3 ........................................ SPX2810AM3-3.3/TR ................................. SPX2810AR .................................................. SPX2810AR/TR ........................................... SPX2810AR-2.5 ........................................... SPX2810AR-2.5/TR .................................... SPX2810AR-3.0 ........................................... SPX2810AR-3.0/TR .................................... SPX2810AR-3.3 ........................................... SPX2810AR-3.3/TR .................................... SPX2810AT .................................................. SPX2810AT/TR ............................................ SPX2810AT-2.5 ........................................... SPX2810AT-2.5/TR ..................................... SPX2810AT-3.0 ........................................... SPX2810AT-3.0/TR ..................................... SPX2810AT-3.3 ........................................... SPX2810AT-3.3/TR ..................................... SPX2810AU .................................................. SPX2810AU-2.5 ........................................... SPX2810AU-3.0 ........................................... SPX2810AU-3.3 ........................................... 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% Package Types .............................................................. 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 TO-252 ................................................................ 3 lead TO-252 ................................................................ 3 lead TO-252 ................................................................ 3 lead TO-252 ................................................................ 3 lead TO-252 ................................................................ 3 lead TO-252 ................................................................ 3 lead TO-252 ................................................................ 3 lead TO-252 ............................................................... 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 TO220 .................................................................. 3 lead TO220 .................................................................. 3 lead TO220 .................................................................. 3 lead TO220 Available in lead free packaging. To order add "-L" suffix to part number. Example: SPX2810AM-3.3/TR = standard; SPX2810AM-L-3.3/TR = lead free /TR = Tape and Reel Pack quantity is 500 for TO-263, 2000 for TO-252 and 2500 for SOT-223. Corporation ANALOG EXCELLENCE Sipex Corporation Headquarters and Sales Office 22 Linnell Circle Billerica, MA 01821 TEL: (978) 667-8700 FAX: (978) 670-9001 e-mail: [email protected] Date: 5/25/04 SPX2810 1A Low Dropout Linear Regulator 12 © Copyright 2004 Sipex Corporation ORDERING INFORMATION Part Number Accuracy SPX2810M3 .................................................. SPX2810M3/TR ........................................... SPX2810M3-2.5 ........................................... SPX2810M3-2.5/TR .................................... SPX2810M3-3.0 ........................................... SPX2810M3-3.0/TR .................................... SPX2810M3-3.3 ........................................... SPX2810M3-3.3/TR .................................... SPX2810R ..................................................... SPX2810R ..................................................... SPX2810R-2.5 ............................................. SPX2810R-2.5/TR ....................................... SPX2810R-3.0 ............................................. SPX2810R-3.0/TR ....................................... SPX2810R-3.3 ............................................. SPX2810R-3.3/TR ....................................... SPX2810T ..................................................... SPX2810T/TR .............................................. SPX2810T-2.5 .............................................. SPX2810T-2.5/TR ....................................... SPX2810T-3.0 .............................................. SPX2810T-3.0/TR ....................................... SPX2810T-3.3 .............................................. SPX2810T-3.3/TR ....................................... SPX2810U ..................................................... SPX2810U-2.5 ............................................. SPX2810U-3.0 ............................................. SPX2810U-3.3 ............................................. 2% 2% 2% 2% 2% 2% 2% 2% 2% 2% 2% 2% 2% 2% 2% 2% 2% 2% 2% 2% 2% 2% 2% 2% 2% 2% 2% 2% Package Types .............................................................. 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 TO-252 ................................................................ 3 lead TO-252 ................................................................ 3 lead TO-252 ................................................................ 3 lead TO-252 ................................................................ 3 lead TO-252 ................................................................ 3 lead TO-252 ................................................................ 3 lead TO-252 ................................................................ 3 lead TO-252 ............................................................... 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 TO220 .................................................................. 3 lead TO220 .................................................................. 3 lead TO220 .................................................................. 3 lead TO220 Available in lead free packaging. To order add "-L" suffix to part number. Example: SPX2810AM-3.3/TR = standard; SPX2810AM-L-3.3/TR = lead free /TR = Tape and Reel Pack quantity is 500 for TO-263, 2000 for TO-252 and 2500 for SOT-223. Corporation ANALOG EXCELLENCE Sipex Corporation Headquarters and Sales Office 22 Linnell Circle Billerica, MA 01821 TEL: (978) 667-8700 FAX: (978) 670-9001 e-mail: [email protected] 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 SPX2810 1A Low Dropout Linear Regulator 13 © Copyright 2004 Sipex Corporation