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pt5108x high-psrr 500ma ldo p a g e 1 general description the pt5108 is a low-dropout vo ltage regulator designed for p o rt able applications that requir e bo th low noise perfor m ance and board space. its psrr at 1k hz is be tter th an 70db. the pt5 108?s performan ce is id eal for b a tter y powered s y stems for deliv ering low d r opout voltage and low quiescen t curren t . an opti onal extern al b ypass capacitor r e duces th e ou tput noise and inc r ea se s psrr. the dev i ce can be used for mobile phone and similar batter y po wered wireless applications. it pr ovides up to 500 ma, from a 2.5v to 5 . 5v in put. the pt510 8 consumes less than 0.1a in shutdown mode and h a s fast tur n -on time less than 150s. th e pt5108 is available in 5 pin s o t-23 packag e (pd free) . selected p e rformances ar e specif ied fo r ? 40c to +85 c tem p er atur e range. th e ou tpu t voltage is availabl e in the rang e of 1 . 5v to 5.0v. fea t ures ? 2.5v to 5 . 5v inp u t rang e ? 72db psrr @1khz, v i n = v out + 1v ? < 1ua qu iescent current at shutdo wn mode ? fast turn on time: 150us (ty p ical) ? 290mv maximu m dropout voltage with 400ma load ? thermal shutdo wn and short- cir c uit curr ent limit ? 1.5, 1.8 , 2.0 , 2.5 v , 2 . 6v , 2 . 7v , 2 . 8v , 2 . 85v , 2 . 9v , 3.0v , 3.1v , 3.2v , 3.3v , 4.7v , 4 . 8v , 4.9v and 5.0v output standard ? miniatur e sot - 23-5 pack age (pd free) applica t ions ? cdma/gsm mobile phone ? handless teleph one ? wlan and blu e tooth applian c es ? pdas/ m p3 handsets ? batter y power ed portab l e devices ty pical applica t ions 100 1 k 10 k 1 0 0 k -75 -70 -65 -60 -55 -50 -45 -40 -35 -30 ri p p l e rej ecti on vs frequency frequency (hz) r i ppl e reje ct i on (db) v in (d c) = 3.0v v in (a c) = 40 0 m v v ou t = 2. 5v c ou t = 1u f c bp = 10 n f i ou t =1 00 ma,150ma i out =50ma v in v en byp a ss gnd v out 1 uf 1 uf 10 nf v in v out * c in c bp c out c out : recom m e nde d ceram ic capacitor c bp : th e op tio nal b y p a s s capacito r for n ois e red u cti o n micro-bridge
pt5108x high-psrr 500ma ldo p a g e 2 orderin g informa t ion* pack a g e t e m p eratur e ran g e out put v o ltage (v) part num b er 1. 5 p t 51 0 8 x 2 3e -1 5 1. 8 p t 51 0 8 x 2 3e -1 8 2. 0 p t 51 0 8 x 2 3e -2 0 2. 5 p t 51 0 8 x 2 3e -2 5 2. 6 p t 51 0 8 x 2 3e -2 6 2. 7 p t 51 0 8 x 2 3e -2 7 2. 8 p t 51 0 8 x 2 3e -2 8 2 . 85 p t 5 108 x23 e -285 2. 9 p t 51 0 8 x 2 3e -2 9 3. 0 p t 51 0 8 x 2 3e -3 0 3. 1 p t 51 0 8 x 2 3e -3 1 3. 2 p t 51 0 8 x 2 3e -3 2 3. 3 p t 51 0 8 x 2 3e -3 3 4. 7 p t 51 0 8 x 2 3e -4 7 4. 8 p t 51 0 8 x 2 3e -4 8 4. 9 p t 51 0 8 x 2 3e -4 9 so t - 23- 5 -4 up 5. 0 p t 51 0 8 x 2 3e -5 0 * all par t s are supplied as 3000 units , tape and r e el. p a cka g es pin descriptions nam e s o t - 2 3 descripti o n v in 1 i npu t of ldo gn d 2 gr ou n d v en 3 ena b l e i n p u t l ogi c, e n abl e h i gh byp a ss 4 opt i o nal by pas s capaci t o r fo r noi se re duct i on v out 5 o u t put o f l d o pt 5108 3 2 1 4 5 v en gnd v in byp a ss v out sot 23 - 5
pt5108x high-psrr 500ma ldo p a g e 3 sim p li fied bl ock dia g ram c u rre n t sens e & c u rre n t l i m i t th e r m a l shut dow n b a ndgap r e fe re n c e 1. 25v q u ic k s t a r t ci r u c u t v en v in b y pa ss r1 gn d r2 v out figure 1. g r aph t h e pt5 1 0 8 m a jor func tio nal bl oc ks in fi g u re 1 , t h e bl oc k o f b a n dga p r e fere nc e p r o v i d es t h e refe rence v o l t a ge of t h e l d o. th e resisto r and b y p a ss cap a cito r conn ected to th e byp a ss p i n t o g e t h er form a lo w p a ss filter to attenu ate th e noi se ge nerat e d at t h e re fere n ce bl oc k. the qui c k s t a r t c i rcui t bl oc k i n ject s a s h o r t - t i m e curre nt t o cha r ge t h e by pass ca paci t o r very fast d u r i n g t h e tu rn -o n p e ri o d fo r t h e pu rpo s e o f sp eed u p th e ou tpu t v o l t a g e settle m e n t . th e fast ch ar g i ng stop s when th e b y p a ss capacitor voltage reaches 95% of 1.23v (typical). the op am p block is use d as the error am plifier of th e l d o by c o m p are the refe re nce with the out put feedbac k vol t a ge s. it s ou t put c ont rol s t h e gat e of a l a r g e pm os d r i v e r an d here by a d j u st s t h e o u t p ut vol t a ge . the resistor r 1 and r 2 fo rm a vol t a ge di vi de r t o pr o v i d e t h e feed bac k vol t a ge. the c u r r ent s e nse & li m i t bl oc k se nses t h e l d o o u t p u t cur r ent a n d l i m i t s t h e out p u t cur r ent fr om bei n g t o o h i gh . th is is mo stly a short circu it p r o t ectio n feature. absol ute maxi mum ra tings p a ra mete r v a lue unit v in r a nge -0 .3~ 6 . 0 v v v out r a nge -0 .3~ ( v in +0.3)< 6.0v v v en r a nge -0 .3~ 6 . 0 v v m a x i mu m p o w e r di ssi pat i o n (n ot e1 ) sot 2 3-5 36 4 m w ju nctio n t e m p . 15 0 c st o r a g e t e m p . - 6 5 ~ 150 c lead t e m p . (note2) 23 5 c esd rating , hbm 2 k v
pt5108x high-psrr 500ma ldo p a g e 4 opera t ing range p a ra mete r v a lue u n i t v in r a nge -0 .3~ 5 . 5 v v v en r a nge -0 .3~ ( v in +0. 3 ) < 5. 5 v v therm a l resistance, ja sot 2 3-5 22 0 c / w m a x i mu m p o w e r di ssi pat i o n (n ot e 3 ) sot 2 3-5 25 0 m w op eration t e mp . -4 0~8 5 c el ectrical chara c teristics unless otherwise s p ecif i ed: v in = v ou t( n o m ) + 0. 5v , v en = v in , c in = 1 uf , i out = 1 m a, c out = 1 uf , c by p a s s = 0 . 01 uf t a = +25c. li m its appearin g in bo ldfa ce ty pe apply over the entire junction te m p er atur e r a nge for operation, ? 40 ? c to +85 ? c. ( n ote 4) (note5) sy m b ol para m e ter conditions ty p . min. max. unit output v o ltage e r ror i out = 1 m a -2 2 %v out - 0 . 0 7 0 . 0 7 l i ne regulation e r r o r v in =(v o u t (n o m ) + 0.5v) to 5. 5v 0. 02 - 0 . 1 0 . 1 %/v 0. 006 ? v out l o ad regulation e r r o r ( n ote 6) i out = 1 m a to 500 m a 0. 0023 0. 04 %/ m a i out = 50 m a 72 c by p a s s = 0. 01 uf i out = 150 m a 72 i out = 50 m a 65 psrr power supply rejection ratio ( n ote 7) v in = v o u t (n om ) + 1. 0v f = 1khz c by p a s s = 0 i out = 150 m a 65 db i out = 0 m a 70 75 i out = 1 m a to 500 m a 90 100 i q quiescent current v en = 0v 0. 1 1. 0 ua i out = 50 m a 26 42 76 i out = 100 m a 53 83 1 16 i out = 150 m a 80 182 v di ff dr opout v o ltage ( n ote 8) i out = 400 m a 230 290 mv i sc output shor t c u r r e nt li m it output gr ounded 600 ma i out ( p k) peak output cur r e nt v out v o u t (n om ) ? 5% 550 450 ma t on t u rn -on t i m e (no t e 9 ) c b y p a ss = 0. 01 uf 150 us output noise density c bp = 0, f = 100 khz 200 nv/ hz i en m a xim u m i nput cur r e nt at v en v en = 0. 4 and v in = 5. 5 1 na v il m a xim u m l o w i nput lev e l at v en v in = 2. 5 to 5. 5 0. 4 v v ih m i nim u m high i nput lev e l at v en v in = 2. 5 to 5. 5 1. 4 v t h erm a l shutdown t e m p eratu r e 1 6 0 c tsd t h erm a l shutdown hyster esis 2 0 c ? v out /v out v out t e m p er a t ur e characteristics t e m p eratu r e = -40 to 125 o c 70 pp m / o c
pt5108x high-psrr 500ma ldo p a g e 5 note 1 : t h e absolute m a xim u m power dissipation depe nds on the am bien t te m p er ature and c a n be calcu lated using the form ula: p d =(t j -t a )/ ja , where t j is the junction te m p erature, t a is the a m bient t e m p eratur e, and ja is the junction- to- a m b ient ther m a l resistance. t h e 364m w ratin g f o r sot 23- 5 appear in g under absolute m a xim u m ratings r e sults fr o m substituting the absolut e m a xi m u m junction tem p er atur e, 150 ? c, for t j , 7 0 ? c for t a , and 220 ? c/w for ja . m o r e power can be dissipated safely at a m bient tem p er atures below 70 ? c. less power can be dis s ipated saf e ly a t am bient te m p er atu r es above 70 ? c. t h e absolute m a xi m u m power dissipation can be increase d by 4.5 m w f o r ea ch degree below 7 0 ? c, and it m u st be der a ted by 4. 5 m w for each degr ee above 70 ? c. note 2 : additional inform ation on lea d te m p eratur e and pad te m p erature may be obtained by contact cr powt ech note 3 : l i ke the absolute m a xim u m power dissipa tion, the m a xi m u m power dissipation for oper a tion depends on the am bien t te m p er atur e. th e 250 m w rating for sot23-5 appearin g under oper ating ratings results from substituting th e m a xi m u m junction te m p e r ature for o p era tion, 125 ? c, for t j , 7 0 ? c for t a , and 220 ? c/w for ja above. m o r e p o wer can be dissipate d at am bient tem p er atur es below 70 ? c. l e ss power can be dissipated at am bient te m p eratur es above 70 ? c. the m a xi m u m po wer dissipation f o r operation can be increased by 4.5 m w f o r each degree below 70 ? c, and it m u st be derated by 4. 5 m w for each degr ee above 70 ? c. note 4 : the tar g et output voltage, which is labeled v out ( n o m ) , is the desir e d voltage option. note 5 : all lim its ar e guar a nteed. all electr i cal character i stics having r o o m - t e m p e r a tur e li m i ts are tested dur ing pr oduction wi th t j = 25 ? c or correlated using st atistical quality co ntrol m e thods. all hot and cold li m i t s are guarante e d by correlating the e l ectrical char act eri s tics to process and tem p er atur e var i ations and appl y i ng statistical pr ocess contr o l. note 6 : an increas e in the load cur r e nt r e sults in a slight decr ease in the output voltage and vice ver s a. note 7 : the prss is m easured b y ap plying a 50 m v p- p s i ne wave on v in an d m easure the ripp le at v out (see fig u re 2 ) . figur e 2. gr aph s how the sine waveform added on v in to m e asure ps rr note 8 : dr opout voltage is the input- t o- output volta ge d i ffer e nce at which the output voltage is 100 m v below its no m i nal value. this specif i cation does not apply for input voltages belo w 2. 5v. note 9 : turn-on t i m e is ti m e m easu r ed between the e n able input ju st exceeding vih and the output voltag e just reaching 95 % of its nom inal value.
pt5108x high-psrr 500ma ldo p a g e 6 typical performance chara cteristics unless othe rwi s e s p ecified: v in = v out(no m ) + 0.2v , v en = v in , c in = c ou t = 1 uf c e ra m i c, c byp a s s = 0.01 uf t a = +2 5c, en ab le p i n is tied t o v in .
pt5108x high-psrr 500ma ldo p a g e 7 ti me (100 s/ d i v) short circuit current 0 600 10 0 200 30 0 400 50 0 70 0 800 v in = 5 v ou tp u t sh ort e d to gnd tim e (100 s/ di v ) en ab le resp on se v in = 3 . 0v v ou t = 2.5 v c ou t = 1uf c bp = 10n f
pt5108x high-psrr 500ma ldo p a g e 8 1 0 0 1 k 10k 100 k -75 -70 -65 -60 -55 -50 -45 -40 -35 -30 ri pp le re je ct i o n vs fr e que nc y f r e q u e nc y (hz ) ri pp le r e jec t io n ( d b) v in( d c) = 3 . 0v v in( a c) = 4 0 0 m v v out = 2. 5v c out = 1 u f c bp = 10 nf i out = 1 0 0 m a ,1 50ma i out = 50ma
pt5108x high-psrr 500ma ldo p a g e 9 applica t ion informa t ion in pu t cap ac it or an i n pu t cap acito r of 1. 0 f i s requi re d bet w een t h e pt5 1 0 8 v in and g nd pi n. thi s capaci t o r m u st be located wit h in 1cm distance from v in pin and c o nnecte d to a clear ground . a ce ram i c capacitor is recomm ended alth o ugh a g o o d qu ality tan t alu m o r film m a y b e u s ed at th e in pu t. howev e r , a tan t alu m cap acit o r can su f f er catastrophic fa ilures due to s u r g e c u rre nt when c o nnected to a l o w i m pedance po wer s u p p l y ( s uc h a s a bat t e ry o r a very lar g e capa c itor). there i s n o re qui rem e nt fo r t h e e s r on t h e i n put ca pac itor , but tolera nce and tem p erature c o ef ficient m u st be co nsid ered in o r d e r to en su re th e cap acito r wo rk wit h in th e op er ation ran g e o v e r th e f u ll r a ng e of te m p er atu r e and ope rat i n g c o n d i t i ons. outp ut ca p a cit o r in app licatio n s , it is im p o r tant to select th e o u t p u t cap acit o r to k e ep th e pt510 8 in stable o p e ration . th e o u t p u t cap acito r m u st m eet all th e req u i rem e n t s sp ecified i n the follo wing reco mmen d e d cap acito r tab l e o v e r all co nd itio ns in app licatio n s . th e m i n i m u m cap acitan c e for stab ility a n d correct o p e ratio n is 0 . 6 f . the capacita nce tolerance shoul d be 3 0 % or b e tter over th e op eration te m p erature range. the rec o mmended cap acito r typ e is x7 r t o m eet t h e full device temperat ure speci fication. recommende d output capacitor (c out ) t y p m i n m a x u n i t c a paci t a n c e 1 . 0 0. 6 1 0 f esr 0 40 0 m ? th e cap acitor ap p lication con d ition s also i n clud e dc-b ia s, freq u e n c y an d tem p eratu r e. un stab le op eratio n will resu lt if th e cap acitan ce d r ops b e l o w m i nimum specified value (see the next section cap acito r ch aracteristics). th e pt510 8 is d e sign ed to wo rk with v e ry small cera m ic o u tpu t cap acitors. a 1.0 f capacitor (x7r type) wit h esr t y pe bet w een 0 a n d 4 00m ? is su itab l e in th e pt51 08 app lication s . x5 r cap acito rs m a y b e used bu t h a ve a narrow tem p erature range. w ith these a n d oth e r cap acito r typ e s (y5 v , z6u) t h at m a y b e u s ed , selection relies on th e rang e o f op eratin g con d ition s an d tem p eratu r e ran g e fo r a sp ecified app licatio n . i t m a y also b e p o s sib l e to use tan t alu m or f ilm cap acito r s at th e o u t p u t , but th ese ar e no t as g ood fo r r e aso n s of size and c o st. it i s al s o rec o m m e nded t h at t h e out put ca pa ci t o r be l o cat e d wi t h i n 1cm from t h e o u t p ut pi n a n d ret u rn t o a cl ea n g r ou nd w i r e . ca p a cit o r ch a r a c te risti c s th e pt5 108 is d e si g n ed to wo rk with ceram ic cap acitor on th e ou tpu t t o t a k e adv a n t ag e o f th e ben e fit th ey o f fer: for capacitor values from 1.0 f to 4.7uf ra nge , ceram ic c a pacitors a r e t h e sm alles t , le ast expe nsive and ha ve the l o west esr va l u es ( w hi c h i s go o d f o r el i m inat i ng hi g h f r e que ncy n o i s e) . the esr of a t y pi cal 1uf ce r a m i c capaci t o r is in th e ran g e o f 20 m ? to 40m ? th at easily satisfies th e esr requ irem en t for stab ility b y th e pt51 08 . for b o t h i n put an d out put ca paci t o rs ca ref u l u n d e rst a ndi ng t h e capacitor s p ecifications is re qui red t o e n s u re co rrect d e v i ce o p e ration . th e cap acito r v a l u e can ch ang e g r eatly b ecau s e o f t h e op eratin g co nd ition an d cap acitor type. in particular the out put c a pacitor selection s h oul d ta ke account of all the c a pacitor pa ram e ters to e n s u re that the sp ecification i s satisfied for th e ap p lication. cap acito r v a lu es can v a ry with dc b i as co nd itio ns, tem p eratu r e, and freq u e n c y o f op eration . cap a cito r v a l u es will also d e m o n s trate so m e d ecrease o v e r time d u e to ag ing . th e cap acito r param e t e rs are al so de pe nda nt o n t h e part i c ul ar case si ze wi t h sm al l e r si ze gi vi n g po ore r pe rf o r m a nce fi gu res on gene ral . as a n e x am ple, the followi ng fi gure shows a typical g r ap h s h o w i n g a c o m p ari s on of capacitor case sizes in c a paci t a nce vs . dc b i as pl ot . as s h ow n i n t h e g r ap h, as a result of t h e dc bias condition t h e ca pacitance val u e m a y dr o p bel o w t h e m i nim u m capaci t a nce val u e gi ve n i n t h e re co m m e nded ca paci t o r t a bl e. i t is also recom m ended that the capacitor manufact ure ? s specifi cation for t h e norm al value cap acitor are co nsu lted fo r all co nd i tio n s as so me capacitor sizes may not be s u itable in t h e act ual applica tion.
pt5108x high-psrr 500ma ldo p a g e 1 0 fi gu re 3. gra p h s h o w i n g a t y pi cal vari at i o n i n capacitance vs. dc bias the ceram ic c a pacitor?s ca pa citance can va ry with te m p erature. t h e ca pa c ito r typ e x7 r, wh ich op erates o v e r a te mperat ure ra nge of -55 ? c to +125 ? c, will o n l y v a ry th e cap acitan ce to with in 15 % . th e cap acito r t y p e x5 r h a s a si m ilar to lerance ov er a redu ced tem p erature range of -55 ? c to +85 ? c. m o st large value ceram ic capacitors () 2.2f) are m a nufactured with z 5 u or y5v tem p er ature cha r acteri s tics. their ca pacitan ce can drop by m o re than 50% as the te mp er at u r e goes fr o m 25 ? c t o 8 5 ? c. th e r efo r e x7 r is r e co mme n d e d o v e r z5u an d y5 v in a p p lic a tio n s w h er e th e a m b i en t tem p e r atu r e will ch an g e sign ifican tly ab ov e o r b e l o w 25 ? c. tantalum capacitors are les s desira bl e than c e ram i c for use as out p ut ca pacitors because t h ey are m o re expe nsi v e whe n c o m p ari n g e qui val e nt ca pa ci t a nce an d v o l t a ge rat i n gs i n t h e 1 f t o 4 . 7 f ra ng e. an ot he r i m por t a nt c onsi d erat i o n i s t h at t a nt al um capaci t o r s have hi g h er esr val u es t h an eq ui val e nt si ze ceram i c s. th is m ean s that wh ile it m a y b e po ssi b l e to fi n d a tan t al u m cap acito r with an esr valu e with i n th e stab le ran g e , it wo ul d ha ve t o be l a rg er i n ca paci t a nce ( w hi ch m eans bi gg er and m o re costly) than a cer a m ic cap acito r with th e sam e esr v a lu e. it sh ou ld also b e n o t ed t h at th e esr o f a ty p i cal tan t alu m will in crease ab out 2 : 1 as th e tem p eratu r e g o e s fr om 25 ? c dow n to ? 40 ? c , s o s o m e guar d b a nd m u st be al l o we d. noise byp a ss cap a c it or connecting a 0.01f ca pacitor bet w een t h e c bypas s p i n and gro und sign if ican tly r e du ces no ise on th e r e gu lato r out put . t h i s c a paci t o r i s co nnect e d di rect l y t o a hi g h im pedance no de i n t h e i n t e rnal re fere nce ci rc ui t . a n y sig n i fican t lo ad ing on t h is no d e will cau se a ch an g e on t h e regu lated ou tpu t vo ltag e . fo r th is reason , dc leak ag e current t h rough this pi n m u st be ke pt as l o w as possi ble for best output voltage accuracy. th e typ e s o f cap acito rs b e st su ited fo r th e n o i se b y p a ss cap acito r are ceram i c an d fil m . high -q u a lity ceram ic cap acito rs with eith er npo o r c og d i electric typically h a ve ve ry low l eak age . polypropolene a n d polycarbonate fi lm capaci t o rs are a v ai l a bl e i n sm al l surface -m ount packa g es an d t y pi cal l y have ext r em el y l o w l eaka g e cu rre nt . t h e ad d ition o f a no ise redu ction cap acito r do es n o t a ffect t h e l o ad tran sien t respo n s e of t h e d e v i ce. no -loa d s t ability th e pt510 8 will re m a in stab le and in regu latio n with no ex tern al lo ad . th is is esp ecially i m p o r tan t in cmos ram k e ep-aliv e ap p lication s . on/off i n p u t ope r ation th e pt510 8 is tu rn ed off b y p u lling th e v en pi n l o w, an d t u r n ed o n by p u l l i ng i t hi gh . i f t h i s f u nct i o n i s not use d , t h e v en p i n sh ou ld b e tied to v in to k e ep t h e regu lato r ou tpu t on at all tim e. t o assu re pro p e r op eration , th e sig n a l sou r ce u s ed to driv e t h e v en i nput m u st be abl e t o swi n g a b ove a n d bel o w t h e s p eci fi ed t u r n -o n/ o ff v o l t a ge t h res h ol ds l i s t e d in the electrical charact eristics sectio n und er v il and v ih . fast on-ti m e th e pt510 8 ou tpu t is turn ed o n after v ref v o l t a ge reac hes i t s fi nal val u e ( 1 .2 3v t y pi cal ). to s p ee d up t h i s pr ocess , t h e n o i se red u ct i o n c a paci t o r at t h e by pass pi n i s ch arg e d with an in tern al curre nt source. t h e c u rrent source is turned off when the refe re nce voltage reach e s app r o x i m a t e ly 9 5 % of its fin a l v a lu e. the tu rn on tim e i s d e term in ed by the tim e constant of the bypass ca pacitor. t h e sm aller th e cap acito r v a lu e, th e sh orter th e turn o n time, b u t less noi se get s re du ced. as a re sul t , t u r n o n t i m e and n o i s e red u c t i on need t o b e t a ken i n t o de si gn co nsi d e r at i on w h en choosi ng the value of t h e bypass capacitor .
pt5108x high-psrr 500ma ldo p a g e 1 1 p a cka g e informa t ion ? sot 23- 5 millim eters sym b o l mi n ty p ma x a - - 1 . 2 5 a 1 0 - 0. 1 5 a 2 1 . 0 0 1. 1 0 1. 2 0 a 3 0 . 6 0 0. 6 5 0. 7 0 b 0 . 3 6 - 0. 5 0 b 1 0 . 3 6 0. 3 8 0. 4 5 c 0 . 1 4 - 0. 2 0 c 1 0 . 1 4 0. 1 5 0. 1 6 d 2 . 826 2 . 926 3 . 026 e 2 . 6 0 2. 8 0 3. 0 0 e1 1 . 526 1 . 626 1 . 726 e 0 . 9 5 b s c e 1 1 . 9 0 b s c l 0 . 3 5 0. 4 5 0. 6 0 l1 0 . 59 r e f l 2 0 . 2 5 b s c r 0 . 1 0 - - r 1 0 . 1 0 - 0. 2 5 0 - 8 1 3 5 7 2 6 8 10 micro-bridge

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