1 www.gs-power.com gs78lxx 3-terminal positive voltage regulator dec. 2009 product description features ? wide range of available, fixed output voltages ? internal short circuit current limiting ? internal thermal overload protection ? no external components required ? complementary negative regulators offered (gs79lxx series) ? available in 5% accuracy ? rohs and halogen free compliant and 100% lead(pb)-free applications the gs78lxx series of positive voltage regulators are inexpensive, easy-to-use devices suitable for a multitude of applications that require a regulated supply of up to 100ma. like their higher-powered gs78xx series cousins, these regulators feature internal current limiting and thermal shutdown making them remarkably rugged. no external components are required with the gs78lxx devices in many applications. these devices offer a substantial performance advantage over the traditional zener diode-resistor combination, as output impedance and quiescent current are substantially reduced. ? battery powered systems ? portable consumer equipment ? portable computer ? radio control systems ? logic systems ? power adapter representative schematic diagram 15k 1.2k 420 3.8k 5.0k 3.0 0-25k 1.9k 1.0k 2.85k 19k q1 q2 q3 q11 q12 q7 2.2k c q8 input output ground z1 q4 q6 q5 q9 q10 free datasheet http://www.ndatasheet.com
2 www.gs-power.com gs78lxx packages & pin assignments gs78lxxyf (sot-89) gs78lxxsf (sop-8) gs78lxxnf (to-92) pin no. GS78L05YF gs78l05yuf gs78l12yuf pin no. gs78l05sf gs78l12sf pin no. gs78l05nf gs78l12nf 1 v in v out 1 v out 1 v out 2 gnd gnd 8 v in 2 g nd 3 v out v in 2,3,6,7 gnd 3 v in 4,5 nc ordering information *request for other voltages, please contact factory directly. marking information free datasheet http://www.ndatasheet.com
3 www.gs-power.com gs78lxx absolute maximum ratings t a =+125oc, unless otherwise noted.) symbol parameter maximum unit v in input voltage 25 v sot-89 0.5 sop-8 0.625 p d power dissipation to-92 0.5 w sot-89 200 sop-8 160 ja the junction-to-ambient thermal resistance to-92 200 oc/ w t j operating junction temperat ure range -20 to +120 oc t stg storage temperature range -65 to +150 oc gs78l05 electrical characteristics (v in =10v, i out =40ma, c in =0.33 f, c out =0.1 f, 0oc 4 www.gs-power.com gs78lxx gs78l08 electrical characteristics (v in =14v, i out =40ma, c in =0.33 f, c out =0.1 f, 0oc 5 www.gs-power.com gs78lxx typical performance characteristics dropout characteristics dropout voltage versus junction temperature 4.0 0 2.0 4.0 6.0 8.0 io=1.0ma io=40ma io=100ma v i ,input voltage(v) v o ,output voltage(v) gs78l05 v out =5.0v t j =25 0 2.0 6.0 8.0 10 0 0 25 50 75 100 125 0.5 1.0 1.5 2.0 2.5 v i - v o , i n p u t / o u t p u t d i f f e r e n t i a l v o l t a g e ( v ) t j ,junction temperature() i o =70ma io=40ma io=1.0ma dropout of regulation is defined as when vo=2% of vo input bias current versus ambient temperature input bias current versus input voltage 0 0 25 50 75 100 125 0.5 1.0 1.5 2.0 2.5 v i - v o , i n p u t / o u t p u t d i f f e r e n t i a l v o l t a g e ( v ) t j ,junction temperature() i o =70ma io=40ma io=1.0ma dropout of regulation is defined as when vo=2% of vo 05.010 15 20 25 30 35 40 0 1.0 2.0 3.0 4.0 5.0 i ib ,input bias current(ma) v i ,input voltage(v) gs78l05 v out =5.0v i o =40ma t j =25 maximum average power dissipation versus ambient temperature to-92 type package 1000 10,000 100 10 2 5 5 0 75 100 125 150 p d ,power dissipation(mv) t a ,ambient temperature() no heatsink r ja =200/w p d(max) to 25=625mw free datasheet http://www.ndatasheet.com
6 www.gs-power.com gs78lxx typical applications gs78lxx cin* 0.33uf cout* input output a common ground is required between the input and the output voltages. * c in is required if regulator is located an appreciable distance form power supply filter. **c out is not needed for stability, however, it does improve transient response. design considerations the gs78lxx series of fixed voltage regulators are desi gned with thermal overload protection that shuts down the circuit when subjected to an excessive power overload condition. internal short circuit protection limits the maximum current the circuit will pass. in many low current applications, compensation capacitors are not required. however, it is recommended that the regulator input be bypassed with a capacitor if the regulator is connected to the power supply filter with long wire lengths, or if the output load capaci tance is large. the input bypass capacitor should be selected to provide good high-frequency characteristics to insu re stable operation under all load conditions. a 0.33 f or larger tantalum, mylar, or other capacitor having low internal imped ance at high frequencies should be chosen. the bypass capacitor should be mounted with the shortest possible le ads directly across the regulators input terminals. good construction techniques should be used to minimize ground loops and lead resistance drops since the regulator has no external sense lead. bypassing the output is also recommended. current regulator the gs78lxx regulators can also be used as a current s ource when connected as above. in order to minimize dissipation the gs78l05 is chosen in this applicati on. resistor r determines the current as follows: iout = r v 0 . 5 + i b i b =3.8ma over line and load changes for example, a 100ma current source would require r to be a 50 ? , 1/2 w resistor and the output voltage compliance would be the input voltage less 7v. gs78l05 iout r input 0.33uf constant current to grounded load positive and negative regulator gs78lxx -vi 0.33uf gs79lxx -vo +vo +vi 0.1 uf 0.1 uf 0.33uf free datasheet http://www.ndatasheet.com
7 www.gs-power.com gs78lxx package dimension sop-8 plastic package a1 a a2 e1/2 e1 d b e e/2 pin 1 marking c h e r1 r gauge plane l2 1 2 1 l l1 dimensions millimeters inches symbol min max min max a 1.35 1.75 .053 .069 a1 0.10 0.25 .004 .010 a2 1.25 1.65 .049 .065 b 0.31 0.51 .012 .020 c 0.17 0.25 .007 .010 d 4.90 (typ) .193 (typ) e 6.00 (typ) .236 (typ) e1 3.90 (typ) .154 (typ) e 1.27 (typ) .050 (typ) l 0.40 1.27 .016 .050 l1 1.04 (typ) .041 (typ) l2 0.25 (typ) .010 (typ) r 0.07 - .003 - r1 0.07 - .003 - h 0.25 0.50 .010 .020 0 8 0 8 1 5 15 5 15 2 0 - 0 - free datasheet http://www.ndatasheet.com
8 www.gs-power.com gs78lxx sot-89 plastic package d d1 h l b1 b e e1 ee1 a c dimensions millimeters inches symbol min max min max a 1.40 1.60 .055 .063 b 0.44 0.56 .017 .022 b1 0.36 0.48 .014 .019 c 0.35 0.44 .014 .017 d 4.40 4.60 .173 .181 d1 1.62 1.83 .064 .072 e 2.29 2.60 .090 .102 e1 2.13 2.29 .084 .090 e 1.50 (typ) .059 (typ) e1 3.00 (typ) .118 (typ) h 3.94 4.25 .155 .167 l 0.89 1.20 .035 .047 free datasheet http://www.ndatasheet.com
9 www.gs-power.com gs78lxx to-92 plastic package dimensions millimeters inches symbol min max min max a1 4.4 4.6 .173 .181 a 4.4 4.6 .173 .181 t 3.4 3.6 .133 .142 d .36 .40 .014 .016 p 12.4 13.0 .487 .512 p0 12.5 12.9 .491 .508 p2 6.05 6.65 .238 .262 f1,f2 2.2 2.8 .086 .110 h -1.0 1.0 -.039 .039 w 17.5 19 .688 .748 w0 5.5 6.5 .216 .256 w1 8.5 9.5 .334 .374 w2 - 1 - .039 h 19. 21 .747 .827 h0 15.5 16.5 .609 .650 l1 2.5 - .098 - d0 3.8 4.2 .149 .165 t1 .35 .45 .014 .018 t2 .15 .25 .006 .010 p1 3.55 4.15 .140 .163 p -1 1 -.039 .039 free datasheet http://www.ndatasheet.com
notice notice information furnished is believed to be accurate and reliable. however globaltech semiconductor assumes no responsibility for the consequences of use of such informat ion nor for any infringement of patents or other rights of third parties, which may result from it s use. no license is granted by implicat ion or otherwise under any patent or patent rights of globaltech semiconductor. specifications mentioned in this publication are subject to change without notice. this publication supersedes and replaces all information without express written approval of globaltech semiconductor. contact us gs headquarter 4f.,no.43-1,lane11,sec.6,minquan e.rd neihu di strict taipei city 114, taiwan (r.o.c) 886-2-2657-9980 886-2-2657-3630 sales_twn@gs-power.com wu-xi branch no.21 changjiang rd., wnd, wuxi, jiangsu, china (i nfo. &. tech. science park building a 210 room) 86-510-85217051 86-510-85211238 sales_cn@gs-power.com rd division 824 bolton drive milpitas. ca. 95035 1-408-457-0587 free datasheet http://www.ndatasheet.com
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