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1 date: 5/25/04 spx1587 3a low dropout voltage regulator ?copy right 2004 sipex corporation 3a low dropout voltage regulator spx1587 description features guaranteed 3a output current three terminal adjustable or fixed 1.5v, 1.8v, 2.5v, 3.3v and 5.0v low quiescent current low dropout voltage: 1.1v at 3a line regulation: 0.1% load regulation: 0.1% stable with 10uf ceramic capacitor overcurrent and thermal protection available packages: to-252, to-220, and to-263 similar to industry standard lt1085/ lt1585 the spx1587 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 spx1587 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. spx1587 is available in adjustable or fixed 1.5v, 1.8v, 2.5v, 3.3v and 5.0v output voltages. the spx1587 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 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 _ + 123 spx1587 3 pin to-263 adj/gnd v in v out adj/gnd v out v in 3 2 1 spx1587 3 pin to-220 now available in lead free packaging
2 date: 5/25/04 spx1587 3a low dropout voltage regulator ?copy right 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 1.5v version spx1587a spx1587 output voltage 1.485 1.500 1.515 1.470 1.500 1.530 v i out = 10ma, v in =3.5v 1.470 1.530 1.455 1.545 ? 10ma i out 3a, 3.0v v in 10v 1.8v version output voltage 1.782 1.800 1.818 1.764 1.800 1.836 v i out = 10ma, v in =3.8v 1.764 1.836 1.746 1.854 ? 10ma i out 3a, 3.3v v in 10v 2.5v version 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 3.3v 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 % 3.0v v in 10v,v out =1.5v 0.1 0.2 0.1 0.2 3.3v v in 10v,v out =1.8v 0.1 0.2 0.1 0.2 4.25v v in 10v,v out =2.5v 0.1 0.2 0.1 0.2 4.75v v in 10v,v out =3.3v 0.1 0.2 0.1 0.2 6.50v v in 10v,v out =5.0v load regulation 0.1 0.3 0.1 0.3 % 10ma i out 3a, v out =1.5v 0.1 0.3 0.1 0.3 10ma i out 3a, v out =1.8v 0.1 0.3 0.1 0.3 10ma i out 3a, v out =2.5v 0.1 0.3 0.1 0.3 10ma i out 3a, v out =3.3v 0.1 0.3 0.1 0.3 10ma i out 3a, v out =5.0v dropout voltage 1.00 1.00 v i out =1a (note 2) 1.05 1.05 i out =2a 1.10 1.2 1.10 1.2 i out =3a minimum load current 4 10 4 10 ma (note 4) quiescent current 4 10 4 10 ma fixed voltage versions adjust pin current 50 50 a 120 120 ? current limit 3.2 5 3.2 5 a (v in -v out )=2v 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 thermal resistance 3 3 c/w to-220 junction to case, at tab 60 60 to-220 junction to ambient 33 to-263 junction to case, at tab 60 60 to-263 junction to ambient 66 to-252 junction to case, at tab 126 126 to-252 junction to ambient electrical characteristics specifications are at v in =v out + 1.5v, t a = 25 c, c in = c out = 10 f, i out =10ma, unless otherwise specified. the ? denotes the specifications which apply full operating temperature range -40 c to +85 c, unless otherwise specified. absolute maximum ratings
3 date: 5/25/04 spx1587 3a low dropout voltage regulator ?copy right 2004 sipex corporation typical performance characteristics figure 1. line regulation for spx1587u-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 vin (v) v out (v) 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 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) vout (v) 1.25v adj electrical characteristics: continued (notes) 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 applie d. excluding load or line regulation effect. note 4: adjustable version only.
4 date: 5/25/04 spx1587 3a low dropout voltage regulator ?copy right 2004 sipex corporation application information output capacitor to ensure the stability of the spx1587, 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 applica- tions 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 spx1587 die is attached to the heatsink lead which exits opposite the input, output, and ground pins. thermal characteristics the spx1587 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 tempera- ture 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 resistance of the spx1587. the actual thermal resistance can be determined with experimentation. spx1587 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 exceed the 125 c. 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 capacitor 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 independent 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 approximated 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.
5 date: 5/25/04 spx1587 3a low dropout voltage regulator ?copy right 2004 sipex corporation figure 9. 5v regulator with shutdown spx1587 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 ? spx1587 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 spx1587 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 spx1587 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 figure 6. current source load adj spx1587 v in c 1 out in 4.7 f c 2 i out r 1 v ref r 1 i out = + v out application information: continued -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
6 date: 5/25/04 spx1587 3a low dropout voltage regulator ?copy right 2004 sipex corporation pinouts 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
7 date: 5/25/04 spx1587 3a low dropout voltage regulator ?copy right 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
8 date: 5/25/04 spx1587 3a low dropout voltage regulator ?copy right 2004 sipex corporation package: 3 pin to-220 3 pin to-220 d j1 c1 (5x) e q h1 v p e-pin e3 l e e1 b1 r dimensions in inches symbol min max a 0.160 0.190 b 0.025 0.040 c1 0.015 0.022 d 0.560 0.590 e 0.385 0.415 e 0.090 0.110 e1 0.190 0.210 e3 0.045 0.055 f 0.045 0.055 h1 0.234 0.258 j1 0.090 0.115 p 0.146 0.156 q 0.103 0.113 l 0.540 0.560 3 typ 7 typ b1 0.450 0.060 r0 .243 ref 6.170 ref u0 .300 ref 7.620 ref v0 .240 ref 6.100 ref f a c l
9 date: 5/25/04 spx1587 3a low dropout voltage regulator ?copy right 2004 sipex corporation e m p w l -a- n r b s h a k g d c dimensions in inches symbol min max a .396 0.406 b 0.326 0.336 c 0.170 0.180 d 0.026 0.036 e 0.045 0.055 g 0.100 ref 0.100 ref h 0.580 0.620 k 0.055 0.066 l .000 .010 m 0.098 0.108 n .017 .023 p .090 .110 r0 8 s .095 .105 u .30 ref .30 ref v .305 ref .305 ref w .010 .010 v u terminal 8 3 pin to-263 package: 3 pin to-263
10 date: 5/25/04 spx1587 3a low dropout voltage regulator ?copy right 2004 sipex corporation corporation analog excellence 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. sipex corporation headquarters and sales office 233 south hillview drive milpitas, ca 95035 tel: (408) 934-7500 fax: (408) 935-7600 ordering information part number acc. output voltage package spx1587ar ................... 1% ................................. adj ......................................... 3 lead to-252 spx1587ar/tr ............. 1% ................................. adj ......................................... 3 lead to-252 spx1587ar-1.5 ............. 1% ................................ 1.5v ....................................... 3 lead to-252 spx1587ar-1.5/tr ....... 1% ................................ 1.5v ....................................... 3 lead to-252 spx1587ar-1.8 ............. 1% ................................ 1.8v ....................................... 3 lead to-252 spx1587ar-1.8/tr ....... 1% ................................ 1.8v ....................................... 3 lead to-252 spx1587ar-2.5 ............. 1% ................................ 2.5v ....................................... 3 lead to-252 spx1587ar-2.5/tr ....... 1% ................................ 2.5v ....................................... 3 lead to-252 spx1587ar-3.3 ............. 1% ................................ 3.3v ....................................... 3 lead to-252 spx1587ar-3.3/tr ....... 1% ................................ 3.3v ....................................... 3 lead to-252 spx1587ar-5.0 ............. 1% ................................ 5.0v ....................................... 3 lead to-252 spx1587ar-5.0/tr ....... 1% ................................ 5.0v ....................................... 3 lead to-252 spx1587at .................... 1% ................................. adj ......................................... 3 lead to-263 spx1587at/tr .............. 1% ................................. adj ......................................... 3 lead to-263 spx1587at-1.5 ............. 1% ................................ 1.5v ....................................... 3 lead to-263 spx1587at-1.5/tr ........ 1% ................................ 1.5v ....................................... 3 lead to-263 spx1587at-1.8 ............. 1% ................................ 1.8v ....................................... 3 lead to-263 spx1587at-1.8/tr ........ 1% ................................ 1.8v ....................................... 3 lead to-263 spx1587at-2.5 ............. 1% ................................ 2.5v ....................................... 3 lead to-263 spx1587at-2.5/tr ........ 1% ................................ 2.5v ....................................... 3 lead to-263 spx1587at-3.3 ............. 1% ................................ 3.3v ....................................... 3 lead to-263 spx1587at-3.3/tr ........ 1% ................................ 3.3v ....................................... 3 lead to-263 spx1587at-5.0 ............. 1% ................................ 5.0v ....................................... 3 lead to-263 spx1587at-5.0/tr ........ 1% ................................ 5.0v ....................................... 3 lead to-263 spx1587au ................... 1% ................................. adj ......................................... 3 lead to-220 spx1587au-1.5 ............. 1% ................................ 1.5v ....................................... 3 lead to-220 spx1587au-1.8 ............. 1% ................................ 1.8v ....................................... 3 lead to-220 spx1587au-2.5 ............. 1% ................................ 2.5v ....................................... 3 lead to-220 spx1587au-3.3 ............. 1% ................................ 3.3v ....................................... 3 lead to-220 spx1587au-5.0 ............. 1% ................................ 5.0v ....................................... 3 lead to-220 /tr = tape and reel pack quantity is 500 for to-263 and 2,000 for to-252. available in lead free packaging. to order add "-l" suffix to part number. example: spx1587at-5.0/tr = standard; spx1587at-l-5.0/tr = lead free
11 date: 5/25/04 spx1587 3a low dropout voltage regulator ?copy right 2004 sipex corporation ordering information part number acc. output voltage package spx1587r ...................... 2% ................................. adj ......................................... 3 lead to-252 spx1587r/tr ................ 2% ................................. adj ......................................... 3 lead to-252 spx1587r-1.5 ............... 2% ................................ 1.5v ....................................... 3 lead to-252 spx1587r-1.5/tr .......... 2% ................................ 1.5v ....................................... 3 lead to-252 spx1587r-1.8 ............... 2% ................................ 1.8v ....................................... 3 lead to-252 spx1587r-1.8/tr .......... 2% ................................ 1.8v ....................................... 3 lead to-252 spx1587r-2.5 ............... 2% ................................ 2.5v ....................................... 3 lead to-252 spx1587r-2.5/tr .......... 2% ................................ 2.5v ....................................... 3 lead to-252 spx1587r-3.3 ............... 2% ................................ 3.3v ....................................... 3 lead to-252 spx1587r-3.3/tr .......... 2% ................................ 3.3v ....................................... 3 lead to-252 spx1587r-5.0 ............... 2% ................................ 5.0v ....................................... 3 lead to-252 spx1587r-5.0/tr .......... 2% ................................ 5.0v ....................................... 3 lead to-252 spx1587t ...................... 2% ................................. adj ......................................... 3 lead to-263 spx1587t/tr ................ 2% ................................. adj ......................................... 3 lead to-263 spx1587t-1.5 ................ 2% ................................ 1.5v ....................................... 3 lead to-263 spx1587t-1.5/tr .......... 2% ................................ 1.5v ....................................... 3 lead to-263 spx1587t-1.8 ................ 2% ................................ 1.8v ....................................... 3 lead to-263 spx1587t-1.8/tr .......... 2% ................................ 1.8v ....................................... 3 lead to-263 spx1587t-2.5 ................ 2% ................................ 2.5v ....................................... 3 lead to-263 spx1587t-2.5/tr .......... 2% ................................ 2.5v ....................................... 3 lead to-263 spx1587t-3.3 ................ 2% ................................ 3.3v ....................................... 3 lead to-263 spx1587t-3.3/tr .......... 2% ................................ 3.3v ....................................... 3 lead to-263 spx1587t-5.0 ................ 2% ................................ 5.0v ....................................... 3 lead to-263 spx1587t-5.0/tr .......... 2% ................................ 5.0v ....................................... 3 lead to-263 spx1587u ...................... 2% ................................. adj ......................................... 3 lead to-220 spx1587u-1.5 ............... 2% ................................ 1.5v ....................................... 3 lead to-220 spx1587u-1.8 ............... 2% ................................ 1.8v ....................................... 3 lead to-220 spx1587u-2.5 ............... 2% ................................ 2.5v ....................................... 3 lead to-220 spx1587u-3.3 ............... 2% ................................ 3.3v ....................................... 3 lead to-220 spx1587u-5.0 ............... 2% ................................ 5.0v ....................................... 3 lead to-220 corporation analog excellence sipex corporation headquarters and sales office 233 south hillview drive milpitas, ca 95035 tel: (408) 934-7500 fax: (408) 935-7600 available in lead free packaging. to order add "-l" suffix to part number. example: spx1587at-5.0/tr = standard; spx1587at-l-5.0/tr = lead free /tr = tape and reel pack quantity is 500 for to-263 and 2,000 for to-252.

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