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1 date: 9/01/04 spx2810 1a low dropout linear regulator ? copyright 2004 sipex corporation 1a low dropout positive linear regulator spx2810 / sp2810a features output current of 1a accurate output voltage low quiescent current low dropout voltage of 1.1v at full load 0.2% line and 0.3% load regulation adjustable output down to 1.2v overcurrent and thermal protection output accuracy spx2810a = 1% room temp. spx2810 = 2% room temp. fixed output voltage: 1.5v, 2.5v, 3.0v, 3.3v and 5v (sot223 only) available packages: sot-223,to-252, to-220, and to-263 ? 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 1.5, 2.5v, 3.0v, 3.3v and 5.0v 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 10 f or larger, provides unconditionally stability for most applications. description now available in lead free packaging typical application circuits applications scsi-ii active terminator pocket pc/pdas notebook computers battery chargers disk drives portable consumer equipment portable instrumentation smps post-regulator in out i adj spx2810 c 1 r 1 r 2 v out v in c 2 v out =v ref (1+r 2 /r 1 ) +i adj r 2 v ref 50 a adj 4.7 f + 123 spx2810 3 pin sot-223 adj/gnd v in v out
2 date: 9/01/04 spx2810 / spx2810a 1a low dropout linear regulator ? copy right 2004 sipex corporation spx2810a spx2810 parameter conditions min typ max min typ max units 1.5v version output voltage 0 i out = 1a, 3.3v v in 10v 1.485 1.5 1.515 1.470 1.5 1.530 v 1.470 1.530 1.455 1.545 2.5v version output voltage 0 i out = 1a, 4.0v v in 10v 2.475 2.5 2.525 2.450 2.5 2.550 v 2.450 2.550 2.425 2.575 3.0v version output voltage 0 i out = 1a, 4.5v v in 10v 2.970 3.0 3.030 2.940 3.0 3.060 v 2.940 3.060 2.790 3.090 3.3v version output voltage 0 i out = 1a, 4.8v v in 10v 3.267 3.3 3.333 3.234 3.3 3.366 v 3.234 3.366 3.069 3.399 5.0v version output voltage 0 i out = 1a, 6.5v v in 12v 4.950 5.0 5.050 4.900 5.0 5.100 v 4.900 5.100 4.650 5.150 all output options reference voltage i out =10ma, v in = v out +3v 1.238 1.250 1.263 1.225 1.250 1.275 v 10 i out 1a, 1.5v (v in -v out ) 5.75v 1.225 1.281 1.212 1.288 min load current 1.5 (v in - v out ) 5.75v 510 510ma line regulation 2.75 v in 7v, i out =t j =25 c (note 2) 0.005 0.2 0.005 0.2 % load regulation (v in - v out )=3.0v, 10ma i out 1a, 0.05 0.3 0.05 0.2 % t j =25 c (note 2) dropout voltage i out =1a 1.1 1.2 1.1 1.2 v (note 1) current limit v in =7v,1.4 (v in -v out ) 1.2 2.0 1.2 2.0 a long term stability t a =25 c, 1000hrs 0.3 1.0 0.3 1.0 % thermal regulation 25 c, 20ms pulse 0.01 0.02 0.01 0.02 %/ ? rms output noise t a =25 c, 10hz f 10khz 0.003 0.003 % thermal resistance to-220 junction to tab 3.0 3.0 c/w to-220 junction to ambient 60 60 to-220 junction to tab 3.0 3.0 c/w to-220 juinction to ambient 60 60 to-220 junction to tab 6 6 c/w to-220 junction to ambient 126 126 c/w sot-223 junction tab 15 15 cw to-220 junction to ambient 156 156 c/w 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 notes: note 1: dropout voltage is defined as the input to output differential at which the output voltage drops 100mv below its nomin al 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 int o account. note 2: thermal regulation is defined as the change in output voltage at a time t after a change in power dissipation is appl ied excluding load or line regulation effect. v in =v out + 1.5v, c out = 10 f, at i out = 10ma, t a = 25 c, unless otherwise specified. limits in boldface applies over the full operating temperature range. electrical characterisitcs
3 date: 9/01/04 spx2810 1a low dropout linear regulator ? copyright 2004 sipex corporation typical performance characteristics figure 1. load regulation for spx2810m3-3.3; figure 2. line regulation for spx2810m3--3.3; v in =4.8v, c out =2.2 fv in =4.8v, c out =2.2 f figure 3. dropout voltage vs output current for spx2810m3-3.3; v in =4.89v, c out =10 f figure 5. current limit for spx2810m3-3.3, output voltage deviation, (i out pulsed from 10ma to 1a). 3.280 3.285 3.290 3.295 3.300 3.305 3.310 3.315 3.320 10 100 1000 output current (a) output voltage (v) 3.300 3.310 3.320 3.330 4.8 9.8 14.8 v in (v) v out (v) series 1 series 2 line regulation at 25 c 0.9 1.0 1.1 1.2 1.3 100 200 300 400 500 600 700 800 900 1000 output current (ma) dropout voltage (v) figure 4. current limit for sp1202m3-3.3; v in =4.8v, c in =c out =1.0 f, i out pulsed from 10ma to current limit t emp ( c) -50 -25 0 25 50 75 100 125 2.00 1.50 1.00 0.50 0.00 series 1 series 2 current limit (a) current limit vs temp 125 c 22 f indicating current limit starts v in = 4.0v v in =3.3v fixed 1 o =10ma c in =1 f ten cap c out =2.2 f ten cap 100 0 -100 15 10 0.5 0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 time (ms) output current (a) output devation (mv)
4 date: 9/01/04 spx2810 / spx2810a 1a low dropout linear regulator ? copy right 2004 sipex corporation output capacitor to ensure the stability of the spx1202, an output capacitor of at least 10 f (tantalum or ceramic) or 50 f (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 0.5 ? or less. a larger value of output capacitance (up to 100 f) can improve the load transient response. soldering methods the spx2810 sot-223 package is designed to be compatible with infrared reflow or vapor- phase reflow soldering techniques. during sol- dering, 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. 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 tem- perature range. 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 acti- vated at >144 c and deactiviated at <137 c. 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 sub- strate. refer to table 1 for the results of the experiment. the thermal interaction from other components in the application can effect the thermal resis- tance of the spx2810. the actual thermal resis- tance can be determined with experimentation. spx2810 power dissipation is calculated as follows: p d = (v in - v out )(i out ) maximum junction temperature range: t j = t ambient (max) + p d * ( junction to ambient thermal resistance) although the spx2810 offers some limiting circuitry for overload conditions, it is still nec- essary 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 resis- tance must be taken into account. for example: v in =10v, v out =5v. i out =1.5a and t a =50 c/w theta jc = 3 c/w, theta sinkcase = 6 c/w theta sink = 0.5 c/w power dissipation is calculated as p d = (v in -v out )* i out =7.5w junction temperature will be t j =t a + p d *(theta case-hs +theta hs + theta jc ) or t j = 50 + 7.5(0.5+6+3) = 121.25 c figure 7. substrate layout for sot-223 for thermal experiment. 50 x 50mm 35 x 17mm 16 x 10mm application information
5 date: 9/01/04 spx2810 1a low dropout linear regulator ? copyright 2004 sipex corporation pc board topside copper backside copper thermal resistance area mm 2 area mm 2 area mm 2 junction to ambient c/w 2500 2500 2500 46 2500 1250 2500 47 2500 950 2500 49 2500 2500 0 51 2500 1800 0 53 1600 600 1600 55 2500 1250 0 58 2500 915 0 59 1600 600 0 67 900 240 900 72 900 240 0 85 figure 8. 600ma current source figure 9. typical adjustable regulator 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 2.2 f for a solid tantalum capacitor (fig 10). however the value of the adj-bypass capacitor should be chosen with respectto the following equation: c = 1 / ( 6.28 * f r * r 1 ) where c = value of the capacitor in farads (select an equal or larger standard value), f r = ripple frequency in hz, r 1 = value of resistor r 1 in ohms if an adj-bypass capacitor is used, the amplitude of the output ripple will be inde- pendent of the output voltage. if an adj- bypass capacitor is not used, the output ripple will be proportional to the ratio of the output voltage to the reference voltage: m = v out / v ref where m = multiplier for the ripple seen when the adj pin is optimally bypassed. v ref =1.25v typical application circuits load adj spx2810 v in c 1 out in 4.7 f c 2 i out r 1 v ref r 1 i out = + in out i adj spx2810 c 1 r 1 r 2 v out v in c 2 v out =v ref (1+r 2 /r 1 ) +i adj r 2 v ref 50 a adj 4.7 f +
6 date: 9/01/04 spx2810 / spx2810a 1a low dropout linear regulator ? copy right 2004 sipex corporation figure 11. 12.5v regulator with shutdown figure 10. improving ripple rejection figure 12. recommended connections for best results output voltage the output of the adjustable regulator can be set to any voltage between 1.25v and 10v. the value of v out can be quickly approximated using the formula (figure 9) v out =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 50 a) flows through r2. when i adj is taken into account, the formula becomes v out = v ref (1+ (r 2 /r 1 )) + i adj * r 2 , where v ref =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 r 1 to the case as illustrated in figure 11. for the same reason, r 2 should be connected to the negative side of the load. spx2810 v in r 2 r 1 connect r 2 to load r l connect r 1 to case of regulator r p parasitic line resistance v out adj spx2810 v in 10 f 1 k ? 1% 330 ? 1% + + 4.7 f 5v adj in out (note a) 1k 1k ttl input 2n3904 dropout (max) note a: v in(min) = (intended v out ) + (v ) spx2810 v in r 1 r 2 10 f 10 f* 1k ? , 330 ? 1% + + 4.7 f c 1 *c 1 improves ripple rejection. z c should be ~ r1 at ripple frequency 5v adj in out (note a) v out note a: v in(min) = (intended v out ) + (v dropout (max) ) 1%
7 date: 9/01/04 spx2810 1a low dropout linear regulator ? copyright 2004 sipex corporation package: pinouts 13 2 sot-223 (m3) t op view t o-263-3 (t) 1 2 3 f ront view t o-220-3 (u) 1 23 f ront view t o-252 (r) adj/gnd v out 1 23 v in adj/gnd v out v in adj/gnd v out v in adj/gnd v out v in t op view + - current limit i cl i tl thermal limit v ref amp v out v in adj/gnd i adj ~ 50 a ? block diagram
8 date: 9/01/04 spx2810 / spx2810a 1a low dropout linear regulator ? copy right 2004 sipex corporation package: 3 pin sot-223 see detail a c b2 c gauge plane seating plane h a a1 l c 0 e d 1 e e1 c c n b b b2 b section c-c - - 1.80 0.02 - 0.10 dimensions in (mm) 3 pin sot-223 jedec to-261 (aa) variation 6.50 6.70 7.00 7.30 a a1 d e e1 e l min nom max c 0.23 0.30 0.35 6.30 6.70 0 - 10 a2 1.50 1.60 1.70 0.66 0.76 0.84 b b2 2.90 3.00 3.10 3.30 3.50 3.70 2.30 basic e1 4.60 basic 0.75 - - c with plating base metal b section b-b 3 pin sot-223
9 date: 9/01/04 spx2810 1a low dropout linear regulator ? copyright 2004 sipex corporation package: 3 pin to-252 e1 e1/2 d1 dimensions in inches 3 pin to-252 jedec to-252 (aa) variation .018 - .024 c min nom max a1 - - .005 d1 .205 - - e1 h l l1 l2 .370 - .410 .170 - - .055 .060 .070 .108 ref .020 bsc c with plating base metal b contact area seating plane c a1 (l1) l c c gauge plane o l2 3 pin to-252
10 date: 9/01/04 spx2810 / spx2810a 1a low dropout linear regulator ? copy right 2004 sipex corporation package: 3 pin to-220 h1 b seating plane a1 a chamfer optional c a2 a a e ? q d d1 e2 e/2 l l1 c c d d b c with plating base metal b contact area 1 e e1 .140 - .190 .020 - .055 dimensions in (mm) 3 pin to-220 jedec to-220 (ab) variation .080 - .115 .015 .027 .040 .045 - .070 .480 - .507 a a1 a2 b b2 d1 d2 .380 - .420 e min nom max c .014 - .024 d .560 - .650 .330 - .355 e1 .270 - .350 e2 - - .030 e .100 bsc e1 .200 bsc h1 .230 - .270 l1 - - .250 l2 - - - ? p .139 - .161 q .100 - .135 3 pin to-220
11 date: 9/01/04 spx2810 1a low dropout linear regulator ? copyright 2004 sipex corporation package: 3 pin to-263 e d l1 b2 e b .160 - .190 .000 - .010 dimensions in inches 3-pin to-263 jedec to-263 (aa) variation .020 - .039 .015 - .029 .070 - .110 - - - a a1 b c d e e1 l l1 l2 min nom max e .100 bsc .066 - .330 - .380 d1 .270 - - .380 - .420 .245 - - h .575 - .625 .070 l3 .010 bsc 123 c c2 a h seating plane l 0o-8o see view c e/2 v iew c gauge plane a1 seating plane c with plating base metal b section b-b b b 3 pin to-263
12 date: 9/01/04 spx2810 / spx2810a 1a low dropout linear regulator ? copy right 2004 sipex corporation ordering information part number accuracy package types spx2810am3 ............................................... 1% .............................................................. 3 lead sot-223 spx2810am3/tr ........................................ 1% .............................................................. 3 lead sot-223 spx2810am3-1.5 ........................................ 1% .............................................................. 3 lead sot-223 spx2810am3-1.5/tr ................................. 1% .............................................................. 3 lead sot-223 spx2810am3-2.5 ........................................ 1% .............................................................. 3 lead sot-223 spx2810am3-2.5/tr ................................. 1% .............................................................. 3 lead sot-223 spx2810am3-3.0 ........................................ 1% .............................................................. 3 lead sot-223 spx2810am3-3.0/tr ................................. 1% .............................................................. 3 lead sot-223 spx2810am3-3.3 ........................................ 1% .............................................................. 3 lead sot-223 spx2810am3-3.3/tr ................................. 1% .............................................................. 3 lead sot-223 spx2810ar .................................................. 1% ................................................................ 3 lead to-252 spx2810ar/tr ........................................... 1% ................................................................ 3 lead to-252 spx2810ar-1.5 ........................................... 1% ................................................................ 3 lead to-252 spx2810ar-1.5/tr .................................... 1% ................................................................ 3 lead to-252 spx2810ar-2.5 ........................................... 1% ................................................................ 3 lead to-252 spx2810ar-2.5/tr .................................... 1% ................................................................ 3 lead to-252 spx2810ar-3.0 ........................................... 1% ................................................................ 3 lead to-252 spx2810ar-3.0/tr .................................... 1% ................................................................ 3 lead to-252 spx2810ar-3.3 ........................................... 1% ................................................................ 3 lead to-252 spx2810ar-3.3/tr .................................... 1% ................................................................ 3 lead to-252 spx2810at .................................................. 1% ............................................................... 3 lead to-263 spx2810at/tr ............................................ 1% ............................................................... 3 lead to-263 spx2810at-1.5 ........................................... 1% ............................................................... 3 lead to-263 spx2810at-1.5/tr ..................................... 1% ............................................................... 3 lead to-263 spx2810at-2.5 ........................................... 1% ............................................................... 3 lead to-263 spx2810at-2.5/tr ..................................... 1% ............................................................... 3 lead to-263 spx2810at-3.0 ........................................... 1% ............................................................... 3 lead to-263 spx2810at-3.0/tr ..................................... 1% ............................................................... 3 lead to-263 spx2810at-3.3 ........................................... 1% ............................................................... 3 lead to-263 spx2810at-3.3/tr ..................................... 1% ............................................................... 3 lead to-263 spx2810au .................................................. 1% .................................................................. 3 lead to220 spx2810au-1.5 ........................................... 1% .................................................................. 3 lead to220 spx2810au-2.5 ........................................... 1% .................................................................. 3 lead to220 spx2810au-3.0 ........................................... 1% .................................................................. 3 lead to220 spx2810au-3.3 ........................................... 1% .................................................................. 3 lead to220 /tr = tape and reel pack quantity is 500 for to-263, 2000 for to-252 and 2500 for sot-223. 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 click here to order samples
13 date: 9/01/04 spx2810 1a low dropout linear regulator ? copyright 2004 sipex corporation /tr = tape and reel pack quantity is 500 for to-263, 2000 for to-252 and 2500 for sot-223. part number accuracy package types spx2810m3 .................................................. 2% .............................................................. 3 lead sot-223 spx2810m3/tr ........................................... 2% .............................................................. 3 lead sot-223 spx2810m3-1.5 ........................................... 2% .............................................................. 3 lead sot-223 spx2810m3-1.5/tr .................................... 2% .............................................................. 3 lead sot-223 spx2810m3-2.5 ........................................... 2% .............................................................. 3 lead sot-223 spx2810m3-2.5/tr .................................... 2% .............................................................. 3 lead sot-223 spx2810m3-3.0 ........................................... 2% .............................................................. 3 lead sot-223 spx2810m3-3.0/tr .................................... 2% .............................................................. 3 lead sot-223 spx2810m3-3.3 ........................................... 2% .............................................................. 3 lead sot-223 spx2810m3-3.3/tr .................................... 2% .............................................................. 3 lead sot-223 spx2810m3-5.0 ........................................... 2% .............................................................. 3 lead sot-223 spx2810m3-5.0/tr .................................... 2% .............................................................. 3 lead sot-223 spx2810r ..................................................... 2% ................................................................ 3 lead to-252 spx2810r/tr .............................................. 2% ................................................................ 3 lead to-252 spx2810r-1.5 ............................................. 2% ................................................................ 3 lead to-252 spx2810r-1.5/tr ....................................... 2% ................................................................ 3 lead to-252 spx2810r-2.5 ............................................. 2% ................................................................ 3 lead to-252 spx2810r-2.5/tr ....................................... 2% ................................................................ 3 lead to-252 spx2810r-3.0 ............................................. 2% ................................................................ 3 lead to-252 spx2810r-3.0/tr ....................................... 2% ................................................................ 3 lead to-252 spx2810r-3.3 ............................................. 2% ................................................................ 3 lead to-252 spx2810r-3.3/tr ....................................... 2% ................................................................ 3 lead to-252 spx2810t ..................................................... 2% ............................................................... 3 lead to-263 spx2810t/tr .............................................. 2% ............................................................... 3 lead to-263 spx2810t-1.5 .............................................. 2% ............................................................... 3 lead to-263 spx2810t-1.5/tr ....................................... 2% ............................................................... 3 lead to-263 spx2810t-2.5 .............................................. 2% ............................................................... 3 lead to-263 spx2810t-2.5/tr ....................................... 2% ............................................................... 3 lead to-263 spx2810t-3.0 .............................................. 2% ............................................................... 3 lead to-263 spx2810t-3.0/tr ....................................... 2% ............................................................... 3 lead to-263 spx2810t-3.3 .............................................. 2% ............................................................... 3 lead to-263 spx2810t-3.3/tr ....................................... 2% ............................................................... 3 lead to-263 spx2810u ..................................................... 2% .................................................................. 3 lead to220 spx2810u-1.5 ............................................. 2% .................................................................. 3 lead to220 spx2810u-2.5 ............................................. 2% .................................................................. 3 lead to220 spx2810u-3.0 ............................................. 2% .................................................................. 3 lead to220 spx2810u-3.3 ............................................. 2% .................................................................. 3 lead to220 ordering information corporation analog excellence available in lead free packaging. to order add "-l" suffix to part number. example: spx2810m-3.3/tr = standard; spx2810m-l-3.3/tr = lead free headquarters and sales office 233 south hillview drive milpitas, ca 95035 tel: (408) 934-7500 fax: (408) 935-7600 click here to order samples

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