1 date: 11/30/04 spx2815 1.5a low dropout voltage regulator ? copyright 2004 sipex corporation 1.5a low dropout voltage regulator spx2815 description features guaranteed 1.5a output current three terminal adjustable or fixed 2.5v, 3.3v and 5.0v low quiescent current low dropout voltage of 1.1v at 1.5a 0.1% line and 0.1% load regulation stable with 10uf ceramic capacitor overcurrent and thermal protection available packages: to-252, to-220, and to-263 similar to industry standard lt1086/ lt1586 ? the spx2815 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 spx2815 features very low quiescent current and a low dropout voltage of 1.1v at a full load. as output current decreases, quiescent current flows into the load, increasing efficiency. spx2815 is available in adjustable or fixed 2.5v, 3.3v and 5.0v output voltages. the spx2815 is offered in several 3-pin surface mount packages: to-252, to-220 and to-263. an output capacitor of 10 f ceramic or tantalum provides unconditional stability. applications desktop pc's servers powering vga and sound cards cordless phones battery chargers adjustable power supplies portable instrumentation smps post-regulator constant current regulators disk drives functional diagram (adjustable) + - current limit i cl i tl thermal limit v ref amp v out v in adj/gnd + i adj ~ 50 a 1.25v _ + refer to page 5 for pinouts now available in lead free packaging
2 date: 11/30/04 spx2815 1.5a low dropout voltage regulator ? copyright 2004 sipex corporation power dissipation.......................................internally limited 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 supply voltage .................................................... +10v input to output voltage ................................................ +8.8v esd rating .............................................................. 2kv min parameter min typ max min typ max units conditions 2.5v version spx2815a spx2815 output voltage 2.475 2.500 2.525 2.450 2.500 2.550 v i out = 10ma, v in =4.5v 2.450 2.550 2.425 2.575 10ma i out 3a, 4.25v v in 10v 3.30v version output voltage 3.267 3.300 3.333 3.234 3.300 3.366 v i out = 10ma, v in =5v 3.234 3.366 3.201 3.399 10ma i out 3a, 4.75v v in 10v 5.0v version output voltage 4.950 5.000 5.050 4.900 5.000 5.100 v i out =10ma, v in =7v 4.900 5.100 4.850 5.150 10ma i out 3a, 6.50v v in 10v all voltage options reference voltage 1.238 1.250 1.262 1.225 1.250 1.275 v i out =10ma, (v in - v out )= 2v 1.225 1.275 1.212 1.287 10ma i out 3a, 1.5v (v in -v out ) 10v output voltage 0.3 0.5 % temperature stability line regulation 0.1 0.2 0.1 0.2 % 4.25v v in 10v,v out =2.5v,i out =10ma 0.1 0.2 0.1 0.2 4.75v v in 10v,v out =3.3v,i out =10ma 0.1 0.2 0.1 0.2 6.50v v in 10v,v out =5.0v,i out =10ma load regulation 0.1 0.3 0.1 0.3 % 10ma i out 1.5a, v out =2.5v 0.1 0.3 0.1 0.3 10ma i out 1.5a, v out =3.3v 0.1 0.3 0.1 0.3 10ma i out 1.5a, v out =5.0v dropout voltage 1.00 1.00 v i out =0.5a (note 2) 1.10 1.2 1.10 1.2 i out =1.5a quiescent current 4 10 4 10 ma fixed voltage versions adjust pin current 50 120 50 120 a current limit 2.5 2.5 a (v in -v out )=5v thermal regulation 0.01 0.1 0.01 0.1 %/w 25 c, 30ms pulse ripple rejection 60 75 60 75 db f ripple =120hz, (v in -v out )=2v, v ripple =1v pp long term stability 0.03 0.03 % 125 c, 1000hrs rms output noise 0.003 0.003 % % of v out , 10hz f 10khz electrical characteristics at v in =v out + 1.5v, t a = 25 c, c in = c out = 10 f, i out =10ma, unless otherwise specified. the boldface applies over the full operating temperature range. absolute maximum ratings
3 date: 11/30/04 spx2815 1.5a low dropout voltage regulator ? copyright 2004 sipex corporation typical performance characteristics figure 1. line regulation for spx2815u-3.3; i out =10ma 3.300 3.305 3.310 3.315 3.320 3.325 4.5 6.5 8.5 10.5 12.5 14.5 v in (v) v out (v) 1.225 1.23 1.235 1.24 1.245 1.25 1.255 1.26 1.265 1.27 1.275 -50 -30 -10 10 30 50 70 90 110 130 t emp (c) v out (v) 1.25v adj figure 2. v out vs temperature, v in =2.5v, i out =10ma figure 3. v in =4.0v, i out =10ma 2.45 2.46 2.47 2.48 2.49 2.5 2.51 2.52 2.53 2.54 2.55 -50 -30 -10 10 30 50 70 90 110 130 t emp (c) v out (v) 2.5v adj 2.5v fixed figure 4. v in =5.0v, i out =10ma 3.26 3.28 3.3 3.32 3.34 3.36 3.38 -50 -30 -10 10 30 50 70 90 110 130 t emp (c) v out (v) 3.3v adj 3.3v fixed output capacitor to ensure the stability of the spx2815, an output capacitor of at least 10 f (ceramic or tantalum) or 22 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 to guarantee stability. 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 spx2815 die is attached to the heatsink lead which exits opposite the input, output, and ground pins. thermal characteristics the spx2815 features the internal thermal lim- iting to protect the device during overload con- ditions. special care needs to be taken during continuous load conditions such that the maxi- mum junction temperature does not exceed 125 c. thermal protection is activated at >179 c and deactiviated at <165 c. the thermal interaction from other components in the application can effect the thermal resis- tance of the spx2815. the actual thermal resistance can be determined with experimenta- tion. spx2815 power dissipation is calculated as follows: p d = (v in - v out )(i out ) maximum junction temperature range: t j = t a (max) + p d * thermal resistance (junction-to-ambient) maximum junction temperature must not ex- ceed the 125 c. application information
4 date: 11/30/04 spx2815 1.5a low dropout voltage regulator ? copyright 2004 sipex corporation -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 100 1000 10000 100000 1000000 frequency, hz ripple rejection, db figure 5. ripple rejection; vin=3.3v, vout=1.8v (adj.), iload=200ma figure 6. current source load adj spx2815 v in c 1 out in 4.7 f c 2 i out r 1 v ref r 1 i out = + v out ripple rejection ripple rejection can be improved by adding a capacitor between the adj pin and ground as shown in figure 8. 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 22 f for an electrolytic aluminum capacitor or 10 f for a solid tantalum capacitor (fig 7). however the value of the adj-bypass capaci- tor should be chosen with respect to 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 r1 in ohms. if an adj-bypass capacitor is used, the amplitude of the output ripple will be indepen- dent 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 ripple rejection for the adjustable version is shown in figure 5. output voltage the output of the adjustable regulator can be set to any voltage between 1.25v and 15v. the value of v out can be quickly approxi- mated using the formula v out =1.25 *(r 1 + r 2 )/r 1 a small correction to this formula is required depending on the values of resistors r 1 and r 2 , since the adjustable pin current (approx 50 a) flows through r 2 . 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 to avoid this, connect r 1 directly to v out as illustrated in figure 13. for the same reason, r 2 should be connected to the negative side of the load. application information: continued
5 date: 11/30/04 spx2815 1.5a low dropout voltage regulator ? copyright 2004 sipex corporation figure 9. 5v regulator with shutdown spx2815 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% 1k ? spx2815 10 f 1% 330w 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 ) v in figure 10. recommended connections for best results figure 8. improving ripple rejection spx2815 r 2 r 1 connect r 2 to load r l connect r to case of regulator r p parasitic line resistance adj v out v in in out i adj spx2815 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 + figure 7. typical adjustable regulator application information: continued t op view t o-263-3 (t) 1 2 3 front view t o-220-3 (u) 1 23 front 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 pinouts
6 date: 11/30/04 spx2815 1.5a low dropout voltage regulator ? copyright 2004 sipex corporation package: 3 pin to-263 e d l1 b2 e b 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 symbol min nom max a 0.16 - 0.19 a1 0 - 0.01 b 0.02 - 0.039 c 0.015 - 0.029 d 0.33 - 0.28 d1 0.27 - - e 0.38 - 0.42 e1 0.245 - - e h 0.575 - 0.625 l 0.07 - 0.11 l1 - - 0.066 l2 - - 0.07 l3 note: dimensions in (mm) 3 pin to-263 jedec to-263 (aa) variation .100 bsc .010 bsc
7 date: 11/30/04 spx2815 1.5a low dropout voltage regulator ? copyright 2004 sipex corporation package: 3 pin to-220 h1 b seating plane a1 a chamfer optional c a2 a a c with plating base metal b contact area e ?p q d d1 e2 e/2 l l1 c c d d b 1 e e1 e symbol min nom max a 1.4 - 0.19 a1 0.02 - 0.055 a2 0.08 - 0.115 b 0.015 0.027 0.04 b2 0.045 - 0.07 c 0.014 - 0.024 d 0.56 - 0.65 d1 0.33 - 0.355 d2 0.48 - 0.507 e 0.38 - 0.42 e1 0.27 - 0.35 e2 - - 0.03 e e1 h1 0.23 - 0.27 l1 - - 0.25 l2 --- ?p 0.139 - 0.161 q 0.1 - 0.135 note: dimensions in (mm) 3 pin to-220 jedec to-220 (ab) variation .100 bsc .100 bsc
8 date: 11/30/04 spx2815 1.5a low dropout voltage regulator ? copyright 2004 sipex corporation package: 3 pin to-252 e1 e1/2 d1 c with plating base metal b contact area seating plane a1 (l1) l c c gauge plane l2 c ? symbol min nom max a1 - - 0.005 c0. 018 - 0.024 d1 0.205 - - e1 0.17 - - h0.37- 0.41 l0. 055 0.06 0.07 l1 l2 note: dimensions in (mm) .020 bsc 3 pin to-252 jedec to-252 (aa) variation .108 ref
9 date: 11/30/04 spx2815 1.5a low dropout voltage regulator ? copyright 2004 sipex corporation corporation analog excellence sipex corporation headquarters and sales office 233 south hillview drive milpitas, ca 95035 tel: (408) 934-7500 fax: (408) 935-7600 part numbers acc. top mark output voltage package spx2815ar ............................. 1% .......... spx2815aryyww..............adj .................. 3 lead to-252 spx2815ar/tr ....................... 1% .......... spx2815aryyww..............adj .................. 3 lead to-252 spx2815ar-2.5 ....................... 1% .......... spx2815ar25yyww...........adj ................. 3 lead to-252 spx2815ar-2.5/tr ................. 1% .......... spx2815ar25yyww...........adj ................. 3 lead to-252 spx2815ar-3.3 ....................... 1% .......... spx2815ar33yyww...........adj ................. 3 lead to-252 spx2815ar-3.3/tr ................. 1% .......... spx2815ar33yyww...........adj ................. 3 lead to-252 spx2815ar-5.0 ....................... 1% .......... spx2815ar50yyww...........adj ................. 3 lead to-252 spx2815ar-5.0/tr ................. 1% .......... spx2815ar50yyww...........adj ................. 3 lead to-252 spx2815at ............................. 1% ........... spx2815atyyww..............adj .................. 3 lead to-263 spx2815at/tr ....................... 1% ........... spx2815atyyww..............adj .................. 3 lead to-263 spx2815at-2.5 ....................... 1% .......... spx2815at25yyww...........adj ................. 3 lead to-263 spx2815at-2.5/tr ................. 1% .......... spx2815at25yyww...........adj ................. 3 lead to-263 spx2815at-3.3 ....................... 1% .......... spx2815at33yyww...........adj ................. 3 lead to-263 spx2815at-3.3/tr ................. 1% .......... spx2815at33yyww...........adj ................. 3 lead to-263 spx2815at-5.0 ....................... 1% .......... spx2815at50yyww...........adj ................. 3 lead to-263 spx2815at-5.0/tr ................. 1% .......... spx2815at50yyww...........adj ................. 3 lead to-263 spx2815au ............................. 1% .......... spx2815auyyww..............adj .................. 3 lead to-220 spx2815au-2.5 ....................... 1% .......... spx2815au25yyww...........adj ................. 3 lead to-220 spx2815au-3.3 ....................... 1% .......... spx2815au33yyww...........adj ................. 3 lead to-220 spx2815au-5.0 ....................... 1% .......... spx2815au50yyww...........adj ................. 3 lead to-220 ordering information /tr = tape and reel pack quantity is 500 for to-263 and 2,000 for to-252. click here to order samples
10 date: 11/30/04 spx2815 1.5a low dropout voltage regulator ? copyright 2004 sipex corporation part numbers acc. top mark output voltage package spx2815r ............................... 2% ............ spx2815ryyww..............adj ................... 3 lead to-252 spx2815r/tr ......................... 2% ............ spx2815ryyww..............adj ................... 3 lead to-252 spx2815r-2.5 ......................... 2% ........... spx2815r25yyww...........adj .................. 3 lead to-252 spx2815r-2.5/tr ................... 2% ........... spx2815r25yyww...........adj .................. 3 lead to-252 spx2815r-3.3 ......................... 2% ........... spx2815r33yyww...........adj .................. 3 lead to-252 spx2815r-3.3/tr ................... 2% ........... spx2815r33yyww...........adj .................. 3 lead to-252 spx2815r-5.0 ......................... 2% ........... spx2815r50yyww...........adj .................. 3 lead to-252 spx2815r-5.0/tr ................... 2% ........... spx2815r50yyww...........adj .................. 3 lead to-252 spx2815t ................................ 2% ............ spx2815tyyww..............adj ................... 3 lead to-263 spx2815t/tr .......................... 2% ............ spx2815tyyww..............adj ................... 3 lead to-263 spx2815t-2.5 ......................... 2% ........... spx2815t25yyww...........adj .................. 3 lead to-263 spx2815t-2.5/tr .................... 2% ........... spx2815t25yyww...........adj .................. 3 lead to-263 spx2815t-3.3 ......................... 2% ........... spx2815t33yyww...........adj .................. 3 lead to-263 spx2815t-3.3/tr .................... 2% ........... spx2815t33yyww...........adj .................. 3 lead to-263 spx2815t-5.0 ......................... 2% ........... spx2815t50yyww...........adj .................. 3 lead to-263 spx2815t-5.0/tr .................... 2% ........... spx2815t50yyww...........adj .................. 3 lead to-263 spx2815u ............................... 2% ............ spx2815uyyww..............adj ................... 3 lead to-220 spx2815u-2.5 ......................... 2% ........... spx2815u25yyww...........adj .................. 3 lead to-220 spx2815u-3.3 ......................... 2% ........... spx2815u33yyww...........adj .................. 3 lead to-220 spx2815u-5.0 ......................... 2% ........... spx2815u50yyww...........adj .................. 3 lead to-220 ordering information /tr = tape and reel pack quantity is 500 for to-263 and 2,000 for to-252. 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 aris ing out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor t he rights of others. click here to order samples
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