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this is information on a product in full production. fe bru a ry 201 4 d oc id 02 274 5 r e v 9 1 /25 25 s t bb2 8 00 m a 2.5 m h z, h i gh ef fi ci enc y du al m ode bu ck -boos t dc-dc c onv erter d a tash eet - p r o duc tion d a ta featur es ? o per at ing in put vol t ag e r a n ge fr o m 2. 4 v to 5.5 v ? 2% o u tpu t v o lt age tol e r anc e o v e r pr oc es s an d tem per a t ur e v a r i a t io ns ? by pa ss po wer s a v e fu nc tio n ? se le cta b le outp u t v o l t age with ded ic ated vs el pi n ? ve r y fa st li ne a nd loa d tr an si ent s ? 2.5 mhz s w it ch ing fr equ enc y ? po wer s a v e m ode ( p s) a t li gh t lo ad ? t y p i c a l effi c i en cy hi gh er tha n 90 % ? 50 a m a x . qu ies c ent cu r r en t ? f l i p ch ip 20 bum ps 0.4 mm pi tch 2.1 x 1.8 mm appl ication s ? me mor y ca r d s upp ly ? cel l u l ar p hon es desc ri ption the STBB2 is a fixed frequency, high efficiency, buck-boost dc-dc converter which provides output voltages from 1.2 v to 4.5 v starting from input voltage from 2.4 v to 5.5 v. the device can operate with input voltages higher than, equal to, or lower than the output voltage making the product suitable for single li-ion, multi-cell alkaline or nimh applications where the output voltage is within the battery voltage range. the low-r ds(on) n-channel and p-channel mosfet switches are integrated and help to achieve high efficiency. the mode pin allows the selection between auto mode and forced pwm mode, taking advantage from either lower power consumption or best dynamic performance. the bypass function allows the battery power saving. in this operating mode, the high-side switches are turned on so that the output voltage is equal to the input voltage; in this condition the current consumption is reduced to a maximum of 5 a. the device also includes soft-start control, thermal shutdown, and current limit. the STBB2 is packaged in flip chip 20 bumps with 0.4 mm pitch. flip chip 20 (2.1 x 1.8 mm) t a b le 1. dev ice s u mmary or der c odes m ar kin g s p a cka ging o u tp ut vo lt ag es st bb2j ad - r b b 2 t a pe and ree l adju st abl e STBB2 j2 9-r b 2 2 9 t a p e and ree l 2 . 9 v / 3. 4 v STBB2 j3 0-r b 2 3 0 t a p e and ree l 3 . 0 v / 3. 3 v www.st.com http://
contents STBB2 2/25 docid022745 rev 9 content s 1 a pp l i ca ti on sc hema tic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 b lock diagra m . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 a bsolute m axi mum ra ti n g s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 p in c onfi guration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 e le ctric a l c h ara c ter i stic s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6 t ypi c a l performa nce cha r ac te ristic s . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7 g ene r al des c ription . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 7 . 1 d u a l m o d e o p e r a ti o n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 5 7 . 2 e n a b l e p i n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 5 7.3 b y p ass oper at ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 7.4 vsel pi n ope rat i o n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 7 . 5 p ro te c t io n f e at u r e s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 7 7.5.1 s o f t- st a r t and sh or t- ci r c ui t . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 7.5.2 u nd er vo lt ag e l o c k o u t . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 7.5.3 o ve r t emp e r a tur e pr otec ti on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 8 a pp l i ca ti on information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 8.1 p r ogr am mi ng the out put vol t age . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 8.2 i nduc tor se lec t i on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 8.3 i nput an d out put ca p a ci to r sel e cti on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 8 . 4 l a y o u t g u i d e lin e s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 9 8.5 p r oduct e v al uati on boar d . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 8 . 6 t h e r m a l c o n s id e r a t io n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1 9 p a cka ge m echa n ica l da t a . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 1 0 revi sion hi story . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
docid022745 rev 9 3/25 st b b 2 a p p l icat io n sc h e mat ic 1 ap plic ation sch ematic figu r e 1 . applica t ion schema t ic f o r f i x e d ve rsion f i g u r e 2. ap p l i cat io n sc h e mat i c f o r ad ju st ab le ver sio n note : a ll th e a bov e co mpo nent s r e fer to a typ i c a l ap pli c ati on. op er ati on of the dev i c e is n o t li mit ed to the ch oi ce of th es e ex te r n al co mpo nent s . t a ble 2 . t y pic a l e x te r n a l c o mpone nt s compo n ent m a nufa c ture r part nu mbe r v a l u e si z e c1 mu rat a g r m1 88r 6 0 j 106 m 1 0 f 060 3 td k-epc c 1 60 8x5r 0 j 10 6m c 2 mu rat a g r m1 88 r 6 1c 10 5k 1 f 060 3 c3 , c4 mu rat a g r m1 88r 6 0 j 106 m 1 0 f 060 3 td k-epc c 1 60 8x5r 0 j 10 6m l (1 ) 1. i nduct o r used f o r t h e m a ximum powe r c a p abil i t y . o p t i m i zed choice can be m ade ac cording t o t h e app l i cat i on c ondit i ons (see se ct i o n 8 ). m u ra t a l q h3 npn1 r0 nm 0 1. 0 h 3 x 3 x 1.4 mm c o ilc raf t l ps301 5-10 2m l 3 .0 x 3 . 0 x 1. 5 m m td k-epc v l s25 201 0et1 r 0 n 2 . 5 x 2 x 1 mm r 1 d e p e n d in g o n th e ou tpu t v o lt age , 0 fo r fi xed ou tpu t ve rsi o n r2 d epe ndi ng on the out put vo lt a ge, not us ed f o r fi xe d o u tpu t ve r si o n fb v out sw 2 sw 1 vi n v ina l1 pg nd gn d bp en m ode v sel vina 1 vba t c3 c4 c1 c2 fb vo ut sw2 sw1 vin vin a l1 pg nd g n d bp en vse l mod e vina 1 vb at c1 c2 r1 r2 c4 c3
block diagram STBB2 4/25 docid022745 rev 9 2 bl ock d iagram f i g u r e 3. blo c k d i ag r a m a d j u st a b l e f i g u r e 4. blo c k d iag ra m f ixed shut do wn en - + v r e f and s o f t -st a r t - + d evi c e co ntro l osc - + - + gate driv er otp uvlo fb vsel mo de vsel bp gn d bu r s t co n t r o l 1 vina 1 vi n a ea bp sw1 sw 2 dm d dm d logi c co ntro l vi n vou t co m p 1 os c os c + - vsu m vsu m co m p 2 burst co n t r o l 2 level sh i f t am10455v1 am10456v1 s hut do wn en - + v r e f and s o f t -st a r t - + devic e co ntro l osc - + - + gat e driv er otp uvlo fb vsel mode vsel bp gn d bu r s t co n t r o l 1 vina1 vi n a ea bp sw1 sw 2 dm d dm d logi c co ntro l vi n vou t comp 1 os c os c bu r st co n t r o l 2 + - vsum vsu m co m p 2 vsel bp level s h i f t
docid022745 rev 9 5/25 s t bb 2 a b s olut e ma x i mum r a t i ngs 3 ab solu te m axim u m r a ting s note: absolute maximum ratings are those values beyond which damage to the device may occur. functional operation under these conditions is not implied. t a b l e 3. ab s o l u t e maxim u m rat i n g s sym bol pa rame ter v a lue unit vin, vina, vina1 s up ply v o lt age -0.3 to 7.0 v sw1, sw2 s w i tc hi ng n o d e s - 0.3 to 7.0 v vo ut o u tpu t v o lt age -0.3 to 7.0 v m o d e , en, bp , vsel lo gic pi ns -0.3 to 7.0 v f b fee dba ck pi n - 0.3 to 6.0 v es d h u m an bod y m o d e l 200 0 v c harg e d dev ic e m o d e l 500 t amb o pera t in g am bi ent tem p e r atu r e - 40 to 85 c t j ma xi mu m o pe r atin g j unc ti on t em pera t ure 150 c t st g s t orag e temp era t ure - 65 to 150 c t a b l e 4. t h e r ma l d a t a sym bol pa rame ter v alu e un it r th j a thermal resistance junction-ambient 80 (1) c/w 1. pcb condition: jedec standard 2s2p(4-layer).
pin configuration STBB2 6/25 docid022745 rev 9 4 pi n c o nf i g ura t i o n figure 5 . p i n c onn e c tions (top v i e w ) a4 [en] b4 [bp] c4 [mode] d4 [vsel] a3 [vina] b3 [vina1] c3 [gnd] d3 [gnd] a2 [vin] b2 [sw1] c2 [pgnd] d2 [sw2] a1 [vin] b1 [sw1] c1 [pgnd] d1 [sw2] e4 [gnd] e3 [fb] e2 [vo] e1 [vo] a4 [en] b4 [bp] c4 [mode] d4 [vsel] a3 [vina] b3 [vina1] c3 [gnd] d3 [gnd] a2 [vin] b2 [sw1] c2 [pgnd] d2 [sw2] a1 [vin] b1 [sw1] c1 [pgnd] d1 [sw2] e4 [gnd] e3 [fb] e2 [vo] e1 [vo] a4 [e n ] b4 [bp] c4 [mode] d4 [vsel] a3 [vina] b3 [vina1] c3 [gnd] d3 [gnd] a2 [vin] b2 [sw1] c2 [pgnd] d2 [sw2] a1 [vin] b1 [sw1] c1 [pgnd] d1 [sw2] e4 [gnd] e3 [fb] e2 [vo] e1 [vo] top view bottom view t a ble 5 . pin de s c r i ption pin n a me pin n des c ripti o n vout e1, e2 o u tpu t v o lt a ge. sw2 d 1, d 2 sw itc h p i n - int e rna l s w itc h e s c a nd d are co nne cte d to th is pin . c o n nec t i ndu cto r betw e en sw1 t o sw 2. pgnd c1 , c2 po we r g r o u n d . sw 1 b 1, b2 sw itch p i n - int e rna l s w itch e s a a n d b are co nn ect ed t o th is pi n. c o nne ct ind u c t or betw e en sw1 a n d sw2. en a4 enab le pin . c o n nec t th is pi n to g n d or a vo lt a ge low e r tha n 0 . 4 v t o s hut do w n th e ic . a vol t ag e h i gh er t han 1.2 v is re qui red to e nab le the ic . d o not lea v e thi s pin flo a ti ng. m o de c4 whe n in no rma l o pera t io n, t he m o d e pi n s e le ct s b e tw e en a u to mo de and for c ed pwm mo de. if th e mo d e pin is lo w , th e st bb2 au tom a t i ca ll y s w itc h e s b e tw ee n p u ls e-s k i pp ing and s t an dar d pwm ac c o rdi ng to th e lo ad le ve l. if the m o d e p i n is p u l l ed h i gh , the STBB2 alw a ys w o rk s i n pw m mo d e . d o no t le av e th is pi n fl oat ing . vi n a a3 su p p l y v o l t ag e f o r co nt r o l s t ag e. vi na1 b3 a 100 res i s t or i s i n te rnal ly c onn ect ed betw e en vin an d vin a1 . c o n nec ti ng a 1 f cap a c i to r be tw een vin a1 and g n d . vin a1, a2 pow e r i n p u t v o l t age . c o n n e c t a c e ram i c by p a s s c a p a c i t or (1 0 f mi n.) b e tw ee n t h is pi n and pg n d . g n d c 3 , d 3 , e4 sign al grou nd. fb e3 fee dba ck vo lt a ge. for the fix e d ve rsi on t h is pi n mu s t b e c onn ec ted to v ou t .
docid022745 rev 9 7/25 st b b 2 p i n c o n f igura t ion bp b4 byp a ss m ode s e le cti on. whe n en i s hig h , c o n nec tin g th is pi n to a v o l t age hi ghe r th an 1 . 2 v, the device works in bypass mode. a voltage lower than 0.4 v is required to disable bypass mode. in bypass mode vin is shorted to v out through internal switches. do not leave this pin floating. vsel d4 sele cti on of o u tp ut v o l t ag e fo r fix e d ve rsi ons (0 v ou t = 2. 9 v / 1 v ou t = 3 . 4 v ) , (0 v ou t = 3 . 0 v / 1 v ou t = 3.3 v). thi s fe atu r e i s n o t p r es ent in the ad jus t ab le v e rs i on wh ere the vsel p i n m u s t be con n e c te d to vina. do no t le av e th is pin fl oati n g . t a bl e 5 . p i n de s c r ipt i o n (c o n tinue d) pin n a me pin n des c ripti o n
electrical characteristics STBB2 8/25 docid022745 rev 9 5 electrical cha r ac teristic s - 4 0 c < t a < 85 c , v in = 3 . 6 v ; v ou t = 3. 4 v , v en = v in , v bp = 0 v ; typ i c a l va lu es ar e at t a = 25 c , un le ss oth e r w is e sp eci f i ed. t a b l e 6. e l ec t r ica l ch ar ac t e rist ic s sym bol p a ram e ter t e s t c ondi tions min . t y p . m a x . unit ge ne r a l se ct i o n v in o pera t in g p o w e r i npu t v o lt age ran g e 2.4 5 .5 v i q shu t do w n m ode v en = 0 v 0 . 5 2 a pu ls e- s k i p pi ng i ou t = 0 a, v mo d e = 0 3 5 5 0 a pw m mo d e i ou t = 0 a, v mo d e = v in 81 0 m a by p a s s m o d e v bp = v in ; i ou t = 0 a; v mod e = 0 , v in = 2.4 to 5 . 5 v 51 0 a v uvlo u n de r v ol tag e l o cko u t t h r es h ol d v in ris i n g ; v mod e = v in ; i ou t = 1 00 ma 2. 1 2. 35 v v in fa lli ng; v mod e = v in ; i ou t = 1 00 ma 1. 8 2 .1 f sw sw itc h i ng freq uen cy 2 2 . 5 3 m h z i ou t c o nt i n uo u s ou t p ut cu r r e n t (1 ) 2.5 v v in 5.5 v 8 00 m a i pk sw itc h c u rr ent lim it atio n 2 .4 2. 5 2 .7 a i ps-pw m ps to pwm tra n si tio n 3 0 0 ma pwm to ps tra n si tio n 2 8 0 h effi ci e n c y (v in = 3 . 6 v ; v ou t = 3.4 v) i ou t = 1 0 ma ( ps mo de ) 8 5 % i ou t = 50 ma ( ps mo de ) 9 0 i ou t = 1 50 ma (pw m ) 9 0 i ou t = 2 50 ma (pw m ) 9 1 i ou t = 5 00 ma (pw m ) 9 2 i ou t = 8 00 ma (pw m ) 9 2 t on t u rn -on tim e (2 ) v en from l o w to hig h ; i ou t = 10 m a 2 60 300 s t sh d n t h er m a l sh utd o w n 15 0 c h y s tere s i s 20 c o utpu t vo lt age v ou t o u tpu t v o lt age ran g e 1 .2 4 . 5 v
docid022745 rev 9 9/25 st bb 2 e lect ri cal ch ara c t e r i st ics %v out o u tpu t v o lt age ac cu rac y i n pw m mo de v in = 2 . 5 t o 5. 5 v , v mod e = v in v sel = gnd/v in -1 .5 +1 .5 % ou t p ut v o l t ag e ac cu r a cy in p o w e r sa ve mo de v in = 2. 5 to 5. 5 v , v mo d e = g nd v sel = gnd/v in s u i t ab le outp u t cu rrent to kee p ps ope rati on -3 +3 % v fb fee db ack v olt age accu rac y adj ust abl e vers io n 4 93 5 00 507 m v %v ou t ma xi mu m loa d r e gul at i o n i load = f r om 10 m a to 8 00 m a 0 .5 % v o pp-ps pea k -to - pe ak ripp le in ps mo de i ou t = 1 00 ma 1 3 0 m v i lk f b fb p i n lea k a ge c u rr ent v fb = 5. 5 v 9 a lo gic inpu t s v il lo w - lev e l inp u t vol t ag e (en , m o de, bp , vsel p i ns ) 0. 4 v v ih h i gh - l ev el in p ut v ol t ag e ( en , m o de, bp , vsel p i ns ) 1.2 v i lk - i inp u t l e a k ag e c u rre nt ( en , m o de, bp , vsel p i ns ) v en =v mod e =v bp =v sel = 5 . 5 v 0 .0 1 1 a pow e r sw itch es r ds ( on) p-c han nel on -res i s t anc e 1 30 350 m n - ch ann el on- resi st anc e 1 30 350 m i lk g - p p-c han nel le aka g e cu rrent v in = v ou t = 5. 5 v ; v en = 0 1 a i lk g - n n - ch ann el lea k a ge cu rrent v sw 1 = v sw 2 = 5 . 5 v ; v en = 0 1 a 1. not t e st ed in product i on. t h is value is g uarant ee d by cor r elat ion wi t h r d s ( on) , pe ak c u rrent limit and operat ing input volt age. 2. not t e st ed in product i on. t a b l e 6. ele ct r ic al c h a r ac t eris t i cs ( co n t in u ed ) sym bol p a ram e ter t e s t c ondi tions min . t y p . m a x . unit
typical performance characteristics STBB2 10/25 docid022745 rev 9 6 t y pica l perfo r man ce cha r ac teristic s figure 6. maximum output current vs. input voltage t a b l e 7. t a b l e o f g r a p h s m a xi mu m ou tput cu rrent v s . inp u t v o l t ag e fi gure 5 ef fi ci enc y v s . outp u t c u rr ent (pow e r sa ve en abl ed, v in = 2. 5 v , 3 . 6 v , 4. 5 v / v ou t = 3 . 4 v ) fi gure 6 v s . outp u t c u rr ent (pow e r sa ve di sab l e d , v ou t = 2.5 v , 3.6 v , 4 . 5 v/ v ou t = 3 . 4 v) fi gure 7 v s . outp u t c u rr ent (pow e r sa ve en abl ed, v in = 2.5 v , 3. 6 v , 4 . 5 v/ v ou t = 2 . 9 v ) fi gure 8 v s . outp u t c u rr ent (pow e r sa ve di sab l e d , v ou t = 2.5 v , 3.6 v , 4 . 5 v/ v ou t = 2 . 9 v) fi gure 9 v s . inp u t v o l t ag e pow e r s a v e e nab led , v ou t = 3 . 4 v , i ou t = (1 0; 5 0 ; 1 50; 500 ; 80 0 m a) fig u re 10 v s . inp u t v o l t ag e pow e r s a v e d i s abl ed, v ou t = 3.4 v , i ou t = (10; 50 0; 1 000 ; 20 00 ma) fig u re 12 v s . outp u t c u rr ent (pwm /auto mo de ) fig u re 13 wa v e f o r m s lo ad tran si ent res pon se v in < v ou t fig u re 14 lo ad tran si ent res pon se v in > v ou t fig u re 15 li ne tran si ent res pon se (v ou t = 3. 3 v , i ou t = 150 0 m a) fig u re 16 s t art up a f te r ena bl e (v ou t = 3 . 3 v , v in = 2.4 v , i ou t = 3 00 m a) fig u re 17 s t art up a f te r ena bl e (v ou t = 3 . 3 v , v in = 4.2 v , i ou t = 3 00 m a) fig u re 18 am10444v1 0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2 2 .5 3 3 .5 4 4 .5 5 5 .5 i ou t ma x [ ma ] v in [v ] v out = 2 . 9 v v out = 3 . 4 v
docid022745 rev 9 11/25 st bb 2 t yp ica l p e r f o r man ce ch ara c t e r i st ics f i g u r e 7 . e f f i c i en cy vs. o u t p u t cu rr en t ( p o w e r sa ve m o d e en ab le d v out = 3 . 4 v ) figur e 8 . effic i e n c y v s . outp u t c u rr e n t (powe r s a v e mode dis a ble d v out = 3 . 4 v ) figure 9. efficiency vs. output current (power save mode enabled v out = 2.9 v) 0 10 20 30 40 50 60 70 80 90 100 1 10 100 1000 eff [% ] i ou t [m a ] = vi n v 2. 5 = vin v 3. 6 = vin v 4. 5 en ab l e d p o w er save m o d e v ou t = 3 . 4 v am01436v1 am10437v1 0 10 20 30 40 50 60 70 80 90 100 1 10 100 1000 ef f [ % ] i ou t [ma ] vin = 2.5v vin = 3.6v vin = 4.5v v out = 3. 4 v power save mo d e d i sab l ed am10438v1 0 10 20 30 40 50 60 70 80 90 100 1 1 0 100 1000 ef f [ % ] i ou t [ma ] vin = 2 . 5 v vi n = 3 . 6 v vin = 4.5v v out = 2.9 v p o w er save m o d e en ab l ed
typical performance characteristics STBB2 12/25 docid022745 rev 9 figur e 1 0 . e ffic i e n c y v s . outpu t c u r r e nt (powe r s a v e mode dis a ble d v out = 2.9 v ) f i g u re 1 1 . e ffic i e n c y v s . input v o lt a g e (powe r s a v e e n a b le d, v out = 3. 4 v ) figure 12. efficiency vs. input voltage (power save disabled, v out = 3.4 v) am10439v1 0 10 20 30 40 50 60 70 80 90 100 1 10 100 1000 ef f [ % ] i ou t [ma ] v i n= 2. 5v vin=3.6v vin=4.5v v ou t = 2 . 9 v p o w er save mo d e d i sab l ed am10440v1 0 10 20 30 40 50 60 70 80 90 100 2. 5 3 . 0 3. 5 4. 0 4. 5 5. 0 5. 5 ef f [ % ] v in [v] iout = 10 m a iout = 50 ma iout = 150 ma iout = 500 ma iout = 800 ma power sa v e m o d e v ou t = 3 . 4 v am10441v1 0 10 20 30 40 50 60 70 80 90 100 2. 5 3 . 0 3. 5 4. 0 4. 5 5. 0 5. 5 eff [ % ] v in [v ] iout=10 ma iout= 50 m a iout =150 ma iout=500 ma iout=800 ma po w e r save mode v out = 3.4 v
docid022745 rev 9 13/25 st bb 2 t yp ica l p e r f o r man ce ch ara c t e r i st ics f i g u r e 13 . e f f i ci en cy vs. o u t p u t cu rr en t ( p w m / au t o mo d e ) figu re 1 4 . v in = 2 . 4 v , v out = 3 . 4 v , i out = f r o m 80 ma t o 630 ma figure 15. v in = 4.2 v, v out = 3.4 v, i out = from 80 ma to 1100 ma am10442v1 0 10 20 30 40 50 60 70 80 90 100 1 10 100 1000 e ff [% ] i ou t [m a ] v i n= 2.5v p w m mode vin=2.5v auto mode v ou t = 3 . 4 v time base 1 msec output v o l t age 200 mv /di v , ac output current 500 ma/div v out = 3.4 v input voltage 200 mv/div, dc offset 2.46 output current 500 ma/div output v o l t age 200 mv /di v , a c v out = 3.4 v time base 1 msec input vol t age 200 mv /di v , d c offset 4.2 v
typical performance characteristics STBB2 14/25 docid022745 rev 9 figur e 1 6 . v in = fr om 3 . 6 v to 4 v , v out = 3. 4 v , i out = 3 00 m a f i g u r e 17. s t ar t u p a f t e r en ab le ( v out = 3.3 v , v in = 2 . 4 v , i out = 300 ma) figure 18. startup after enable (v out = 3.3 v, v in = 4.2 v, i out = 300 ma) input v o l t age 400 mv /di v , offset = 3.6 v output voltage 20 mv/div timebase 1 msec sw2 sw1 v out i sw sw 2 sw1 v out i sw
docid022745 rev 9 15/25 st b b 2 g e ne ral d e scr ipt i on 7 gene r a l descrip tion t h e st b b 2 i s a h i g h ef fic i e n c y du al m ode buc k- b oos t sw itc h mo de c onv er te r . t han ks to the 4 in ter nal s w itc h e s , 2 p - c h a nne ls and 2 n - c h a nnel s , it is ab le to d e li ve r a we ll - r eg ula t ed o u tpu t v o lt a ge u s i n g a v a r i a b le in put vo lt ag e wh ic h c an be h i g her tha n , e qua l to , or l o we r th an t he d e s i r e d outp u t v o l t age . t h i s so lv es mos t o f the po wer s uppl y pr obl em s t hat ci r c ui t d e s i gn er s f a c e whe n d eal ing wi th b a tter y po wer ed equi pm ent. t h e co ntr o l l er us es an a v e r a ge c u r r e n t m ode te ch ni que i n or de r to obt a i n g ood s t ab il ity in a l l p o s s i b le c ond iti ons o f i npu t v o l t age , ou tput v o lt a ge and ou tput cu r r e n t. i n a ddi tio n , t he pea k i ndu cto r cu r r en t i s m oni tor e d to a v o i d sa tur a ti on of th e c o i l . t h e st b b 2 c an wo r k i n tw o di f f er ent mod e s : pw m mod e or p o wer s a v e m ode . in the f i r s t c a s e , t he d e v i c e o per ate s with a fi x ed o s c i l l a t or fr eq uenc y in al l l i n e /l oad co ndi tio n s . t h i s i s th e s u i t abl e co ndi tio n to ob t a i n th e m a x i m u m dy nam ic pe r f or man c e . in th e s e c ond c a s e t he d e v i c e op er ate s i n b u r s t mod e al lo win g a dr as tic r edu cti o n of t he p o wer c o n s um pti on. t o p - c l a s s li ne a nd l oad tr ans ie nt s ar e ac hi ev ed th ank s to a fe ed- for w a r d tec hni qu e and due to the in nov ati v e c ontr o l me tho d s pec if ic all y des i gned to opti m i z e the per fo r m anc e i n th e b u c k - b o o st r egi on w her e i npu t v o l t age is v e r y c l ose to the o u tp ut v o l t age . t h e st b b 2 is s e l f - p r o tec t ed fr om sh or t- ci r c ui t a nd o v e r te mpe r atur e. unde r v ol t age lo ck ou t a nd s o f t - s t a r t gu ar ant ee p r o per o per ati on dur in g s t ar tup . in put vo lt ag e an d g r o und co nne cti ons a r e sp li t i n to p o we r a nd si gna l p i ns . t h i s al low s r e d u c t io n of int e r nal di stu r banc es wh en t he 4 in ter nal s w it che s ar e wo r k in g. t h e s w itc h b r i dge is c onn ec ted betw een the v in an d p g nd pi ns whi l e all lo gi c b l o c k s ar e c onn ec ted b e twee n v in a an d g nd. 7. 1 du al mod e oper a tion t h e s t bb 2 wor k s a t f i x ed fr equ enc y pu ls e w i d t h mo dul ati on ( p w m ) o r in po wer s a v e mod e ( p s) ac c o r d in g to the di f f e r e n t o per ati n g co ndi tio n s . if t he m o de p i n is pu ll ed h i gh the d e v i c e wo r k s at f i x ed f r e que nc y p u ls e wid t h mo dul ati on ( p wm ) ev en a t li gh t or no lo ad. in th is c ond iti on, the st b b 2 pr ov ide s the b e s t dy na mic p e r f or ma nce . if the m o de pin is l ogi c l o w , the st b b 2 ope r a tio n c h a nges a c c o r d i ng t o th e av er ag e i npu t cu r r e n t h andl ed by the d e v i c e . a t l o w a v er a ge c u r r ent the st b b 2 is in ps m ode all o wi ng ve r y l o w po wer c o n s um pti on and ther ef or e ob t a i n in g v e r y goo d ef fi ci enc y ev ent at l i g h t l oad . w hen the a v e r a ge c u r r ent inc r eas es , t he d e v i c e a u tom a ti ca ll y s w i t ch es to f i x ed swi t c h in g fr eq uen cy m ode i n or der to de li ve r th e powe r ne ede d by th e lo ad. in p s mo de th e st b b 2 i m pl em ent s a bur s t mo de o per at ion : i f the out put v o l t ag e in cr ea se s abov e it s nom in al va lue the dev i c e s t ops s w i t ch ing ; as s oon the v out fa ll s b e l o w th e no mi nal v a lu e th e de vi ce r e s t ar t s swit c h i n g. 7. 2 enable pin the device turns on when the en pin is pulled high. if the en pin is low the device goes to shutdown mode and all internal blocks are turned off. in shutdown mode the load is electrically disconnected from the input to avoid unwanted current leakage from the input to the load and the current drawn from the battery is lower than 1 a in the whole temperature range.
general description STBB2 16/25 docid022745 rev 9 7. 3 byp ass op er ati o n in by p a s s mod e th e ou tpu t is c onn ec ted dir e c t l y to th e ba tter y by two p- c han nel s a nd the i ndu cto r . t h e by p a s s fun c ti on has be en i mp l em ent ed i n o r d e r to s a v e ener g y wh en the a ppl ic ati on is in id le mod e . a t l i gh t lo ad con d i t io n, th e de vi ce c an b e i n by p a ss mo de t o r ed uc e the c ur r en t dr ain ed fr om the b atte r y . in b y p a ss mo de th e qui es c ent c ur r ent i s a r o und 5 a . w i t hou t by p a ss f unc tio n , the bu ck - boo st wor k s in p u ls e- s k i ppi ng m ode wi th ar oun d 5 0 a of current c ons um ptio n. t h e de vi ce c an b e pl ac ed in by p a s s m ode by th e b y p pi n. 7. 4 vsel pin oper a ti on f o r t he fi x ed o u tpu t v o lt a ge ve r s io n, th e f b pi n mu st be con nec te d to the v out pi n. f i xe d o u tpu t v o l t age v e r s i ons h a v e tw o d i f f er en t ou tpu t v o lt a ges p r o g r a m m ed in ter n a l l y whic h ar e s e l e c t ed by pr ogr am mi ng h i g h or l o w a t vs e l . t h e hi ghe r o u tp ut v o l t age is s e le ct ed b y p r o g r a mm in g v s e l hi gh and the lo wer out put vo lt ag e i s s e l e c t ed by pr ogr a mmi ng vs el l o w . t h i s f eatu r e is no t pr es en t in the ad jus t ab le ver s io n, wh er e th e v s e l p i n mus t b e c o n nec ted to v in a . t a b l e 8. by p a ss a n d en ab le mat r ix en bp m o de s t a t us 00 0 sh u t d o w n 00 1 sh u t d o w n 01 0 sh u t d o w n 01 1 sh u t d o w n 1 0 0 aut o m ode 10 1 p w m m o d e 1 1 0 bypas s 1 1 1 bypas s t a ble 9. o u t put s e le ct ion p/n v sel v ou t st bb2j - 29 lo w 2 .9 v h i gh 3.4 v st bb2j - 30 lo w 3 .0 v h i gh 3.3 v
docid022745 rev 9 17/25 st b b 2 g e ne ral d e scr ipt i on 7. 5 pr o t ecti o n featur es 7. 5 . 1 s o f t -s t a r t an d s h o r t-c i r cu i t a f ter th e e n pi n i s p u l l ed hi gh, the dev ic e i n i t ia tes the st a r t- u p ph as e. t h e av er ag e c u r r ent l i m i t i s se t to 400 ma at t he b egi nni ng and is gr ad ual ly i n c r e a s ed wh il e th e ou tpu t vo lt a ge i n c r e a s e s . as so on a s th e ou tput v o l t age r e ac hes 1.0 v , t he av er ag e c u r r e n t l i mi t i s s e t to i t s n o mi nal v a lu e. t h i s m e tho d al low s a c u r r e n t li mi t pr opo r t i o n a l to th e outp u t v o lt a ge. if th er e is a sh or t in th e v out pin , th e ou tput cu r r en t do es not ex ce ed 4 00 m a . t h is p r o c e s s is n o t ha ndl ed by a ti me r s o the dev ic e i s als o abl e to st a r t up ev en wi th lar g e ca p a c i t i v e l oad s. 7. 5 . 2 un d e r v o l t a g e l o ck o u t t h e un der v o lt a ge l o c k out f unc ti on p r e v e n t s im pr ope r o per at ion of t he s t bb 2 w hen the i npu t v o l t age i s no t h i g h e nou gh. w hen th e inp u t vo lt ag e is b e l o w the vu vlo thr e s h o l d, th e d e v i c e i s i n s h u t down mo de. t h e hy s t er es is of 100 mv pr ev en t s u n s t abl e o per ati on when th e i npu t v o lt a ge i s cl os e to the uv lo thr e s h o l d. 7. 5 . 3 o v er te m p er a t u r e p r o t ec ti o n an internal temperature sensor continuously monitors the ic junction temperature. if the ic temperature exceeds 150 c (typ.), the device stops operating. as soon as the temperature falls below 130 c (typ.), normal operation is restored.
application information STBB2 18/25 docid022745 rev 9 8 ap plic ation inf o rm ation 8. 1 pr o g r a mm ing the ou t p ut volt age t h e st b b 2 is a v ai la bl e i n two ve r s i ons : fi xe d o u tpu t v o lt a ge a nd adj us t abl e ou tpu t v o lt a ge. in the fir s t c a s e th e de vi c e in teg r a t es the r e s i s t or di vi de r n eed ed t o s e t th e c o r r e c t ou tput v o l t age and the f b p i n mus t b e c onn ec ted dir e c t l y t o v ou t . f o r t he f i x ed v e r s io n, tw o d i f f er en t out put vo lt ag es , pr og r a mme d i n ter n a l l y by the vs el pin , c an be s e l e c t ed. f o r the a d ju st a b le v e r s i on, the vs el pi n mu st be c o n nec ted to v in . t he r e si st or di vi der m u s t be c o n nec ted betw een v out an d g nd a nd t he m i d d le poi nt of th e di v i de r mus t b e c onn ec ted to fb a s sh own i n f i gur e 19 . equation 1 figur e 1 9 . adjus t a b le output v o lt a g e a s u g ges ted v a l ue for r2 is 100 k . t o r e duc e the po wer co nsu m pt ion a m a x i mu m va lu e o f 5 00 k c an be u s e d . 8.2 i nductor selection t h e in duc tor i s the ke y p a ss i v e co mpo nen t for s w it ch ing c onv er ter s . w i th a bu ck - boo st d e v i c e , th e i ndu cto r se lec t i on m u s t t a k e into c ons id er ati on t he fo ll owi ng t w o c o n d iti o n s i n wh ic h th e c onv er te r wor k s : ? a s buc k at th e m a xi mu m o per ati v e in put vo lt ag e of the app li ca tio n ? a s a bo os t at the m i n i mu m o per ati v e i nput vo lt a ge o f the app li ca tio n t w o c r iti c a l i ndu ct a n c e v a l ues ar e t hen obt a i ne d ac c o r d i ng t o the fol l o w in g fo r m ula s : ? ? ? ? ? ? ? ? ? = 1 v v 2 r 1 r fb ou t am10443v1 l1 c4 r1 c1 r2 c2 c3 gnd gnd gnd gnd fb e3 gnd c3 gnd d3 pgnd c2 mode c4 vse l d4 bp b4 en a4 vi na a3 vi n a1 vout e2 pg n d c1 vout e1 gnd e4 sw 2 d2 sw2 d1 sw1 b1 sw 1 b2 vin a2 vina1 b3 st b b 2 gnd gnd gnd gnd
docid022745 rev 9 19/25 stbb 2 a pplica t ion i n f o r m at ion equa tion 2 equa tion 3 wh er e fs i s t he m i n i mu m v al ue of th e s w itc hi ng fr equ enc y and i l is th e p eak - t o- pea k i ndu cto r r i pp le c u r r e n t. t he pea k- to- p e a k r i pp le ca n be s e t at 10% or 20% of th e ou tpu t c u r r ent. the mi ni mum in duc tor v a l ue f o r the app li ca tio n i s th e h i gh es t be tween eq uat ion 2 a nd e qua tio n 3 . in a ddi tio n to the in duc t anc e va lue , the ma xi mum c u r r e n t, w h ic h t he i n d u ct or c a n han dle , mu st be c a l c ula t ed in or der to av oid s a tur a t i on . equa tion 4 equa tion 5 wh er e is the es tim a te d ef fi ci enc y . t he max i m u m of th e two abo ve v a lu es mus t b e c o n s i der ed whe n the in duc tor i s se lec t e d . 8.3 i nput a n d o u tput cap acitor selection it is r e c o mm end ed c e r a m i c c a p a ci tor s to b e us ed wit h l o w e s r as inp u t a nd o u tp ut c a p a ci tor s in or der to fi lte r a n y di stu r b anc e pr es ent i n t he i npu t l i ne and to obt ai n s t ab le o per ati on. m i ni mu m v a l ues of 10 f f o r bot h c a p a c i tor s ar e ne ede d to ac hie v e go od b eha vi or of t he d e v i c e . t h e in put ca p a c i to r mus t b e pl ac ed as cl os er as po ss ib le to th e d e v i c e . 8.4 l a you t gui deli nes du e to the h i g h s w itc h i ng fr e que nc y a nd p eak c u r r e n t, t he l a y out is an imp o r t ant des ig n s t ep fo r all s w itc h i n g powe r su ppl ie s. i f the la yo ut i s not f u lf il led ca r e ful l y , i m po r t a n t p a r a met e r s s u c h a s e f f i c i en cy a nd o u tpu t v o lt a ge r i ppl e m a y be co mpr o m i s ed. l max ma x bu c k mi n i fs vi n ) vo u t vi n ( vo u t l ? = ? l min mi n bo o st mi n i fs vo u t ) vi n vo u t ( vi n l ? = ? l fs vin 2 ) vo ut vi n ( vo ut ) / i ( i ma x ma x ou t bu c k pe a k ? + = ? l fs vo u t 2 ) vi n vo u t ( vi n vi n i vo u t i mi n mi n mi n ou t b oos t pe ak ? + = ?
application information STBB2 20/25 docid022745 rev 9 s hor t a nd wide tr ac es mu st be i mp l em ente d fo r mai n c u r r ent and for po wer gr ou nd paths . t h e in put ca p a c i to r mus t b e pl ac ed as cl os er as po ss ib le to th e d e vi c e pi ns as we ll as the i ndu cto r and out put c apac itor . t h e fee dba ck pi n ( f b ) i s a hi gh im ped anc e n ode , so the in ter f er en ce ca n b e mi ni mi zed by p l ac i ng th e r o u t in g of the feed bac k nod e as fa r as pos s i bl e fr o m th e hi gh cu r r en t p a t h s. a c o m m on gr oun d no de min i m i z e s gr ou nd n o is e. 8. 5 pr o duct eval uati o n b o ar d f i g u re 20 . a s s e m b l y l a ye r figur e 2 1 . t op la y e r
docid022745 rev 9 21/25 stbb 2 a pplica t ion i n f o r m at ion f i g u r e 2 2 . bot t o m lay e r 8. 6 t h er ma l con s ider ati o n t o e nha nc e the the r m a l per fo r m anc e, the powe r dis s i p a tion c a p a b i l i ty of the pcb de si gn c a n be i m p r o v e d by tr ac es as wi de r a s pos si bl e. t h e ma xi mu m r e c o mm end ed jun c ti on t em p er at u r e ( t j ) o f the dev i c e s i s 125 c. t h e j unc ti on a m bi ent ther m a l r e si st a n c e of thi s 2 0 - p in f l i p ch ip p a c k a ge i s 80 c/w , i f a l l pi ns ar e s o l der ed . t o the m ax i m um am bie nt tem per atu r e t a = 85 c the m a x i m u m po wer d i s s i p at ed in si de th e p a ck ag e i s g i v en by : equa tion 6 p di s s_m a x = (t jm ax - t am ax ) / r ja = ( 1 25 - 8 5 ) / 8 0 = 500 mw
package mechanical data STBB2 22/25 docid022745 rev 9 9 packa ge m echan ical da t a in or de r t o me et e n v i r onm ent a l r e q u i r e m en t s , st of fe r s th es e de vi ce s in d i f f er en t gr ad es of ec op ac k ? p a c k a ges , d epe ndi ng o n th eir l e v e l of e n v i r onm ent a l c o m p l i an ce . ec op ack s p e c i f ic ati o n s , g r ade defi n i t io ns and pr odu ct st a t us ar e a v a i l abl e a t : www .s t.c om. e c o p a c k is an st tr ad ema r k . figure 23. flip chip 20 (2.1 x 1.8 mm) package dimensions 7504889_g
docid022745 rev 9 23/25 st bb 2 p ack ag e me ch an ic al d a t a table 10. flip chip 20 (2.1 x 1.8 mm) mechanical data dim . mm m i n. t y p. ma x. a 0 .5 2 0 .5 6 0 . 6 0 a1 0. 17 0 . 23 a2 0. 35 0. 36 0 . 37 b 0 .2 3 0 .2 5 0 . 2 9 d 2 .0 3 2 .0 6 2 . 0 9 d1 1 . 6 e 1 .7 1 1 .7 4 1 . 7 7 e1 1 . 2 e0 . 4 0 se 0. 20 fd 0. 23 fe 0. 27 cc c 0 .0 75
revision history STBB2 24/25 docid022745 rev 9 10 re vision history t a ble 1 1 . doc u me nt r e v i s i on his t or y da te re v i s i o n cha n ge s 2 7 -j an-2 012 1 f i r st rele as e. 2 7 -m ar-2 012 2 d a t a sh ee t pro m o t ed from pr eli m i nary da t a to p r odu ct ion dat a. r e mo ve d: o r de r co de s t b b 2 j 2 8 - r t a ble 1 on p ag e 1 . 09-ma y - 20 12 3 m odi fie d : m a rk in g bb2 t a bl e 1 o n pag e 1 , d e s c ri pti on p i n b4 a nd d 4 ta b l e 5 o n pag e 6 . 26- jul - 20 12 4 m odi fie d : c2 va lue t a ble 2 o n p age 3 . up d a te d : fi g u r e 20 , fi g u r e 21 an d fi g u r e 22 on pag e 2 1 . 19 - sep - 2 01 2 5 mo d i f i ed : fi g u r e 2 o n pa ge 3 . 0 6 -m ar-2 013 6 add ed : ne w orde r c ode STBB2 j3 3-r t a ble 1 o n p age 1 . 17 - d ec - 2 01 3 7 c h a nge d o r der co de f r om the STBB2 j3 3-r to the STBB2 j30 - r in ta b l e 1 : de vi ce su mm ar y and in t a b l e 9 : o u t put sel e c t io n . c ha nge d v o pp-ps ty p. va lue from 1 00 t o 1 30 i n t a b l e 6 : e l ec t r ic al c hara c te rist ic s . m i no r te xt c h a nge s. 2 0 -j an-2 014 8 u pd ate d m e c han ic al dat a . 12 - f eb - 20 1 4 9 up d a te d fe atu r es and de sc ri p t i o n i n c o ve r pa ge . c h a nge d ty p. and m a x . va lu es of v uvlo p a ra m e ter in t able 6 . c ha nge d v in mi n. val u e in t able 6 . c ha nge d v in tes t c ond iti ons of i q par a m e t er i n ta b l e 6 . c ha nge d i pk mi n. v al ue in t abl e 6 . up d a te d ta b l e 7 .
docid022745 rev 9 25/25 st b b 2 p l e ase rea d car e f u ll y: i n f o rma t io n in thi s do c u ment i s pro v ided s o le ly in c onn ec ti on with s t pr odu c t s . st mic r o e lec t roni c s nv and it s s u b s i d iari es (? st ?) res e r v e t h e ri ght to m a k e c hang es , c o r r ec ti ons , mo dif i c a t i ons or i m prov eme n t s , t o th is d o c u men t , and the prod uc ts an d s e rv ic es des c r ib ed he rein a t an y ti m e , w i t h o u t no ti ce . a ll st p r odu c t s are s o ld pu rs uan t to s t ?s t e rms and c o n d it ions of s a l e . p u rc has e r s are s o le ly re s p ons ibl e f o r t he c h oic e , s e le c t io n a nd us e o f th e s t pr oduc t s an d s e rv i c e s de s c rib ed her ein, a nd st a s su m e s n o li abili ty what s o ev er rel a t i ng t o t h e c h o i c e , s e le c t io n o r us e of t he st pro duc t s an d s e rv ic es d e s c r i bed h e rein . no lic ens e, ex pre s s o r impl ied, by es t opp el or ot herwis e , t o a n y int e lle c t ual pro pert y righ ts is gr ant ed unde r th is doc u m e n t . i f any pa rt of th is d o c u ment re fe rs to any t h ird par ty pr oduc t s or s e r v ic e s i t s h a ll no t b e de emed a lic ens e gran t b y st fo r t he u s e of s u c h t h ird part y pro duc t s o r s e r v i c e s , or any int e lle c t ua l p r op ert y c ont ain ed t here i n or c ons ide r ed as a warra nt y c o v e rin g th e u s e i n a n y ma nne r wh at s o ev er of s u c h t h ir d p a rt y p r odu c t s o r s e rv ic es o r a n y i n t e llec t ual pr oper ty c ont aine d th erei n. unle s s o t he rwi s e s e t fo rt h i n s t ? s te rms and c o ndi tio n s o f s a le s t dis c lai m s any e x p r e s s o r i m p l i e d warranty wi th re s p e c t t o t h e us e an d/ o r s a le o f s t p r o d u c ts i nclu d i n g wi th o u t li mi tati o n i m p l i e d warranti e s o f me rchantab i l i t y , fi tn e s s fo r a p arti c ular p urp o s e (and the i r e q ui v a le nts unde r the l a ws o f any juri s d i c t i o n ) , o r i n f r i n g e me nt o f any p a te nt , co p y ri g h t o r o t he r i n te lle c tual p r o p e r t y ri g h t. s t p r o duct s are no t de s i g n e d o r au tho r i z e d fo r us e i n : (a) s a fe ty cri ti cal ap p l i cati o ns s uch as l i fe s u p p o rt i n g , act i v e i m p l ante d de v i ce s o r s y s t e m s wi th p r o duct fu ncti o nal s a fe ty re q u i r e m e n ts ; (b) ae r o naut i c ap p l i cati o ns ; (c) au to mo ti v e ap p l i cat i o ns o r e nv i ro nme n ts , an d/ o r (d) ae r o s p ac e ap p l i cati o ns o r e n v i ro nme n ts . w h e r e s t p r o ducts are n o t de s i g n e d fo r s uch us e , the p urchas e r s hall us e p r o d ucts at p ur chas e r? s s o le ri s k, e v e n i f s t has be e n i n fo rme d i n wri t i ng o f s uch u s ag e , unl e s s a p ro duct i s e x p r e s s l y de s i g nate d by s t as be i n g i n t e nde d f o r ?auto m o t i v e , auto m o t i v e s a fe ty o r me dical? i n d u s t r y do mai n s acco rdi ng to s t p r o duct de s i g n s p e c i f i cati o ns . p r o duct s fo rmally e s cc, q m l o r jan q uali f i e d are de e m e d s u i t a b le fo r us e i n a e ro s p ace by th e co rre s p o ndi ng g o v e rnme n tal a g e ncy . res a le of s t p r odu c t s w i th p r ov is ions dif f e ren t f r om t he s t a t e m ent s a nd/ or t e c hnic a l f e a t ur es s e t f o rt h in th is d o c u men t s hall i mme diat el y v o id a n y w a rran t y gr ant ed by s t f o r t h e s t prod uc t or s e rv ic e des c r ib ed he rein a nd s hal l not c r eat e or ex te nd in a n y manne r what s oev er, a n y li abili t y of s t . st and t he st logo a r e tr ade mark s o r r egis t er ed t r a demar k s of s t in v a r i ous c o unt rie s . i n f o rma t ion in th is do c u ment s u pers e des and re plac es all inf o rma t i on pre v ious ly s u p p lie d. t he st log o i s a reg i s t e r ed t r ade mark of s t mi c r oele c t r on ic s . all ot her n a mes are t he pro pert y of t heir r e s pec t i v e o w ners . ? 2 014 stmic r o e lec t ron i c s - all rig h t s re s e rv ed st mic r o e lec t ron i c s gro up of c o mpani es aus t ral i a - b e lgi u m - b r az il - cana da - china - cz ec h repu blic - f i n l and - f r anc e - g e rma n y - hon g kong - i ndi a - i s rae l - i t a l y - ja p a n - malay s i a - malt a - moroc c o - phili ppin e s - si ngap ore - sp ain - swed en - swit z e rla nd - unit ed kin gdom - unit ed st at es of a m eric a ww w. st . c o m

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