rev. 10/19/00 spx1202 600ma low dropout npn voltage regulator features applications ? guaranteed 600ma output ? portable/ palm top / notebook computers ? three terminal adjustable or fixed 1.5v, 2.5v, 3v, 3.3v & 5v ? battery chargers ? very low quiescent current ? disk drives ? low dropout voltage of 1.2 volts at full load ? portable consumer equipment ? extremely tight load and line regulation ? portable instrumentation ? very low temperature coefficient ? smps post-regulator ? logic-controlled electronic shutdown ? internal overcurrent limiting & thermal overload protection ? surface mount package sot-223, to-263, to-252 , to-220 & so-8 product description the spx1202 is a low power positive-voltage regulator designed to meet 600ma output current. this device is an excellent choic e for use in battery-powered applications, as active terminators for the scsi bus, and portable computers. the spx1202 features very low quiescent current and very low dropout voltage of 1.2v at a full load and lower as output current decreases. this product is a vailable as an adjustable or fixed 3v, 3.3v, and 5v output voltages. the spx1202 is offered in a 3-pin surface mount package sot-223, to-252, to-220 & to-263. the output capacitor of 10 f or larger is needed for output stability of spx1202 as required by most of the other regulator circuits. pin connections front view to-263-3 package 3 2 1 v in v out adj/gnd spx1202 sot-223 package front view spx1202 13 2 v in v out adj/gnd to-220 package front view spx1202 v in adj/gnd v out top view 2 1 3 4 8 7 6 5 spx1202 v out v out v in v in n/c v in n/c gnd 8-pin surface mount front view to-252 package 3 2 1 spx1202 v in v out adj/gnd
rev. 10/19/00 spx1202 absolute maximum ratings power dissipation..........................................internally limited input supply voltage ............................. .........-20v to +20v lead temp. (soldering, 5 seconds) ................................ 260c esd rating ............................................. ...............2kv min storage temperature range ............................ -65 to +150c operating junction temperature range spx1202................................................ -40c to +125c electrical characteristics at v in = v out +1, ta=25c, cl =3.3 f, unless otherwise specified. limits in boldface apply over the full operating temperature range. parameter conditions typ spx1202 min max units 1.5v version output voltage i out =10ma, v in =5.00v 0 i out 600ma, 4.50 v in 10v 1.500 1.485 1.470 1.515 1.530 v 2.5v version output voltage i out =10ma, v in =5.00v 0 i out 600ma, 4.50 v in 10v 2.500 2.475 2.450 2.525 2.550 v 3.0v version output voltage i out =10ma, v in =5.00v 0 i out 600ma, 4.50 v in 10v 3.000 2.970 2.940 3.030 3.060 v 3.3 v version output voltage i out =10ma, v in =5.00v 0 i out 600ma, 4.50 v in 10v 3.300 3.267 3.234 3.333 3.366 v 5.0v version output voltage i out =10ma, v in =5.00v 0 i out 600ma, 4.50 v in 10 5.000 4.950 4.900 5.050 5.100 v all output voltage reference voltage i out =10ma, (v in- v in ) =2v 10 i out 600ma, 1.4 (v in -v in ) 10v 1.250 1.238 1.225 1.262 1.270 v output voltage temperature stability (note 1) 0.05 % line regulation 4.50v v in 12v, v out =3.00, i out =0 4.80v v in 12v, v out =3.30, i out =0 6.50v v in 15v, v out =5.00, i out =0 1.00 1.00 1.00 7.00 7.00 10.00 mv load regulation 0 i out 600ma, v in =4.50v, v out =3.00 0 i out 600ma, v in =4.80v, v out =3.30 0 i out 600ma, v in =6.50v, v out =5.00 1.00 1.00 1.00 12.00 12.00 15.00 mv dropout voltage ( note 2) i l = 100ma i l = 600ma 1.00 1.05 1.10 1.15 v quiescent current 4.25v v in 6.5v 5.00 10.00 ma current limit (v in -v out )=5v 850 1000 ma thermal regulation 25 c, 30ms pulse 0.01 0.1 %/w ripple rejection f ripple =120hz, (v in -v out ) = 3v, v ripple =1v p-p 60 75 db long term stability 125 c, 1000hrs 0.03 % rms output noise % of v out , 10hz f 10khz 0.003 % thermal resistance junction to case, at tab 15 c/w 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 valu e 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 3: thermal regulation is defined as the change in output voltage at a time t after a change in power dissipation is applied. excl uding loads or line regulation effect
rev. 10/19/00 spx1202 application notes external capacitor to ensure the stability of the spx1202 an output capacitor of at least 10 f (tantalum)or 50 f (aluminum) is required. the value may change based on the application requirements on the output load or temperature range. the capacitor equivalent series resistance (esr) will effect the spx1202 stability. the value of esr can vary from the type of capacitor used in the applications. the recommended value for esr is 0.5 ? . the output capacitance could increase in size to above the minimum value. the larger value of output capacitance as high as 100 f can improve the load transient response. soldering methods the spx1202 sot-223 package is designed to be compatible with infrared reflow or vapor-phase reflow soldering techniques. during soldering the non-active or mildly active fluxes may be used. the spx1202 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 temperature range. thermal characteristics the thermal resistance of spx1202 is 15 c/w from junction to tab and 31 c/w from tab to ambient for a total of 46 c/w from junction to ambient. the spx1202 features the internal thermal limiting to protect the device during overload conditions. special care needs to be taken during continuos load conditions the maximum junction temperature does not exceed 125 c. taking the fr-4 printed circuit board and 1/16 thick with 1 ounce copper foil as an experiment (fig.1 & fig.2), 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. the thermal interaction from other components in the application can effect the thermal resistance of the spx1202. the actual thermal resistance can be determined with experimentation. spx1202 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 * thermal resistance(junction-to- ambient) maximum junction temperature must not exceed the 125 c. 10uf + ? .. 27k spx1202 + 10v 10uf 2.85v 50 x 50 mm 35 x 17 mm 16 x 10 mm p o = (10v - 2.85)(105ma) = (7.15)(105ma) = 703mw fig. 1. circuit layout, thermal experiments. fig. 2. substrate layout for sot-223
rev. 10/19/00 spx1202 table 1. total pc board area topdide copper area backside copper area thermal resistance junction to ambient 2500mm 2500mm 2500mm 2500mm 2500mm 1600mm 2500mm 2500mm 1600mm 900mm 900mm 2500mm 1250mm 950mm 2500mm 1800mm 600mm 1250mm 915mm 600mm 240mm 240mm 2500mm 2500mm 2500mm 0 0 1600mm 0 0 0 900mm 0 46 c/w 47 c/w 49 c/w 51 c/w 53 c/w 55 c/w 58 c/w 59 c/w 67 c/w 72 c/w 85 c/w load adj spx1202 600ma current output l v in c 1 r 1 out in in out adj spx1202 c 1 r 1 r 2 v out typical adjustable regulator v out = v ref (1 + r 2 ) + i adj r 2 r 1 v in c 2
rev. 10/19/00 spx1202 ordering information ordering no. precision output voltages packages spx1202u 1% adj 3 lead to-220 spx1202u-1.5 1% 1.5v 3 lead to-220 spx1202u-2.5 1% 2.5v 3 lead to-220 spx1202u-3.0 1% 3.0v 3 lead to-220 spx1202u-3.3 1% 3.3v 3 lead to-220 spx1202u-5.0 1% 5.0v 3 lead to-220 spx1202t 1% adj 3 lead to-263 spx1202t-1.5 1% 1.5v 3 lead to-263 spx1202t-2.5 1% 2.5v 3 lead to-263 spx1202t-3.0 1% 3.0v 3 lead to-263 spx1202t-3.3 1% 3.3v 3 lead to-263 spx1202t-5.0 1% 5.0v 3 lead to-263 spx1202m3 1% adj 3 lead to-223 spx1202m3-1.5 1% 1.5v 3 lead to-223 spx1202m3-2.5 1% 2.5v 3 lead to-223 spx1202m3-3.0 1% 3.0v 3 lead to-223 spx1202m3-3.3 1% 3.3v 3 lead to-223 spx1202m3-5.0 1% 5.0v 3 lead to-223 spx1202s 1% adj 3 lead to-220 spx1202s-1.5 1% 1.5v 8 lead soic spx1202s-2.5 1% 2.5v 8 lead soic spx1202s-3.0 1% 3.0v 8 lead soic spx1202s-3.3 1% 3.3v 8 lead soic spx1202s-5.0 1% 5.0v 8 lead soic spx1202r 1% adj 3 lead t0-252 spx1202r-1.5 1% 1.5v 3 lead to-252 spx1202r-2.5 1% 2.5v 3 lead to-252 spx1202r-3.0 1% 3.0v 3 lead to-252 spx1202r-3.3 1% 3.3v 3 lead to-252 spx1202r-5.0 1% 5.0v 3 lead to-252 signal processing excellence sipex corporation headquarters and main offices: 22 linnell circle billerica, ma 01821 tel: (978) 667-8700 fax: (978) 670-9001 e-mail: sales@sipex.com 233 south hillview drive milpitas, ca 95035 tel: (408) 935-7600 fax: (408) 934-7500 sipex corporation reserves the right to make changes to any products described herein. sipex does not assume any liab ility arising out of the application or use of any pr oduct or circuit described hereing; neither does it convey any license under its patent rights nor the rights of others. corporation
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