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high accuracy , ultralow i q , 1 a, anycap ? low dropout regulator adp3338 re v . b in fo rmation furn ished by an alog d e v i c e s is believed to be accurate and reliable. how e ver, n o resp on sibili ty is assume d b y a n alog de vices fo r its use, nor for an y i n fri n geme nt s of p a t e nt s or ot h e r ri ght s o f th ird parties th at may result fro m its use . specifications subjec t to chan g e witho u t n o tice. no licen s e is g r an te d by implicati o n or ot herwi s e u n der a n y p a t e nt or p a t e nt ri ghts of analog de v i ces. trademarks an d registered tra d ema r ks are the prop erty o f their respective ow ners. one technolog y way, p.o . box 9106, norwood, ma 02062-9106, u.s.a. t e l: 781. 329. 4 700 www.analog.com fax: 781. 461. 31 13 ? 2005 a n alog de vices, i n c. al l r i ght s r e ser v ed . fea t ures high ac cur a c y ov er line and load: 0 .8% @ 25 c, 1.4% ov er te mper a t ur e ultr alow dr opout v o ltage: 190 mv (t yp) @ 1 a requires only c o = 1.0 f f o r stabilit y an yc ap is stabl e with an y t y pe of c a pacit o r (including ml c c ) c u rr en t an d th ermal limit i ng l o w noise 2.7 v t o 8 v sup p ly r a nge ?40 c t o + 85c ambient t e mp er a t ur e r a nge so t - 223 pack a g e applic a t io ns n o t e book, palm t o p c o mput ers scsi t e rmina t o rs ba tt er y - pow e r e d sy stems bar c o de sc anners c a mc or ders , c a mer a s home ent e r t a i nment sy st ems net w ork i ng sy st ems dsp/asic sup p l ies func ti on a l bl ock di a g r a m thermal protection cc in adp3338 out r1 r2 gnd q1 bandgap ref driver g m 02050-001 figure 1. v in out adp3338 1 f 1 f v out gnd in 02050-002 fig u re 2. ty pic a l a pplic at i o n c i r c uit gener a l description the ad p3338 is a m e m b er o f th e ad p33xx fa mil y o f p r ecisio n, lo w dr o p o u t (l d o ), a n ycap vol t a g e r e gu l a t o rs. th e ad p333 8 o p era t es w i t h an i n p u t v o l t a g e ra n g e o f 2.7 v t o 8 v a nd de li v e rs a lo ad c u r r en t u p t o 1 a. th e ad p3338 s t an ds o u t f r o m co n v en ti o n al ld o s w i t h a n o v e l a r c h i t ect u r e a n d a n enh a n c e d p r o c es s t h a t o f fers p e r f o r ma n c e ad van t a g es and hig h er o u t p ut c u r r en t t h a n i t s co m p et i t ion. i t s p a t e n t e d desig n r e q u ir es o n l y a 1 f o u t p u t ca p a ci t o r f o r s t a b il i t y . this device is in s e n s i t i v e t o o u t p u t ca p a c i t o r eq ui valen t s e r i es r e sis t a n ce (e s r ), a nd is s t a b l e wi th a n y g o o d q u ali t y ca pa ci t o r , i n cl ud in g cera m i c (ml c c) typ e s f o r s p ace-r e s t r i c t ed a p p l ic a t io n s . th e adp3338 ac hiev es excep t io nal acc u rac y o f 0.8% a t r o o m t e m p era t ur e and 1.4 % o v er t e m p era t ur e , li n e , and lo ad va r i a t io n s . th e dr o p o u t v o l t a g e o f th e adp3338 is o n l y 190 mv (typ ical) a t 1 a. the device als o in cl udes a s a fet y c u r r en t limi t and t h er mal o v erlo ad p r o t e c t i o n . the ad p3338 has u l tralo w q u ies c en t c u r r en t: 1 10 a (typ ic al) in lig h t lo ad si t u a t ion s .
adp3338 rev. b | page 2 of 16 table of contents specifications ..................................................................................... 3 absolute maximum ratings ............................................................ 4 esd caution .................................................................................. 4 pin configuration and function descriptions ............................. 5 typical performance characteristics ............................................. 6 theory of operation ........................................................................ 9 application information ................................................................ 10 capacitor selection .................................................................... 10 output current limit ................................................................ 10 thermal overload protection .................................................. 10 calculating power dissipation ................................................. 10 printed circuit board layout considerations ....................... 10 outline dimensions ....................................................................... 12 ordering guide .......................................................................... 13 revision history 6/05data sheet changed from rev. a to rev. b added pin function descriptions table ....................................... 5 changes to ordering guide .......................................................... 13 6/04data sheet changed from rev. 0 to rev. a updated format..............................................................universal changes to figures 5, 11, 12, 13, 14, 15 ..................................... 6 updated outline dimensions ................................................... 12 changes to ordering guide ...................................................... 12 6/01rev. 0: initial version
adp3338 rev. b | page 3 of 16 specifications v in = 6.0 v, c in = c out = 1 f, t j = ?40c to +125c, unless otherwise noted. table 1. parameter 1 , , 2 3 symbol conditions min typ max unit output voltage accuracy v out v in = v outnom + 0.4 v to 8 v, i l = 0.1 ma to 1 a, t j = 25c ?0.8 +0.8 % v in = v outnom + 0.4 v to 8 v, i l = 0.1 ma to 1 a, t j = ?40c to +125c ?1.4 +1.4 % v in = v outnom + 0.4 v to 8 v, i l = 50 ma to 1 a, t j = 150c ?1.6 +1.6 % line regulation v in = v outnom + 0.4 v to 8 v, t j = 25c 0.04 mv/v load regulation i l = 0.1 ma to 1 a, t j = 25c 0.006 mv/ma dropout voltage v drop v out = 98% of v outnom i l = 1 a 190 400 mv i l = 500 ma 125 200 mv i l = 100 ma 70 150 mv peak load current i ldpk v in = v outnom + 1 v 1.6 a output noise v noise f = 10 hz to 100 khz, c l = 10 f, i l = 1 a 95 v rms ground current in regulation i gnd i l = 1 a 9 30 ma i l = 500 ma 4.5 15 ma i l = 100 ma 0.9 3 ma i l = 0.1 ma 110 190 a in dropout i gnd v in = v outnom C 100 mv, i l = 0.1 ma 190 600 a 1 all limits at temperature extremes are gua ranteed via correlation using standard st atistical quality control (sqc) methods. 2 application stable with no load. 3 v in = 2.7 v for models with v outnom 2.2 v.
adp3338 r e v. b | pa ge 4 o f 1 6 absolute maximum ra tings u n less ot her w is e sp e c if ie d , a l l vol t a g es a r e r e fer e n c e d t o g n d . table 2. p a r a me t e r r a t i n g i n put sup p ly v o ltage ?0.3 v to +8.5 v p o w e r di ssipa ti on i n ter n ally limite d o p era t ing ambi en t t e mpera tur e r a nge ?40c to +85c o p era t ing junc tion t e mpera tur e r a nge ?40c to +150c ja 62.3c/w jc 26.8c/w stor age t e mpera tur e r a nge ?65c to +150c l e ad t e mper a tur e (s older i ng 10 sec) 300c v a por p h ase (60 sec) 215c i n fr ar ed (15 sec) 220c s t r e s s es a b o v e t h os e list e d u nde r a b s o l u te m a xim u m r a t i n g s ma y ca us e p e r m a n e n t dama ge to t h e de vi ce. t h is is a st r e ss r a t i ng on ly ; f u n c t i on a l op e r at i o n of t h e d e v i c e a t t h e s e or an y o t h e r con d i t ions a b o v e t h o s e i ndic a te d i n t h e op er a t io na l s e c t io n o f t h is sp e c if ic a t io n is no t im pl ie d . e x p o sur e t o a b s o l u te max i m u m r a t i ng co ndi t i on s fo r ex tende d p e r i o d s ma y a f fe c t de vice rel i a b i l i t y . on ly o n e abs o lu te max i m u m r a t i n g ma y b e a pplie d a t an y o n e tim e . esd caution esd (elec t r o st a t ic dischar g e) se nsitiv e devic e . elec tr os t a tic char ges as high as 4000 v r e adily ac cumula te on the human bod y and t e st eq uipmen t and can dischar g e wi thout det e c t ion. although this pr oduc t f e a tur es pr oprietar y esd pr ot ec tion cir c uitr y , permanen t dama ge may oc cur on dev i c e s sub j ec ted to high ener gy elec tr o s ta tic di scharge s . theref or e , proper esd pr ecautio n s a r e r e c o m m ended to a v oid per f or man c e degrada t ion or l o ss of func tiona l it y .
adp3338 r e v. b | pa ge 5 o f 1 6 pin conf igura t ion and fu nction descriptions 02050-003 in 3 out 2 2 gnd 1 out adp3338 top view (n o t to sc a l e ) n o te: pin 2 an d tab are in t e rn ally c o n n e c t ed figure 3. pin c o nfiguration ta ble 3. pi n f u nct i on d e s c ri pt i o ns p i n no . m n emonic description 1 g n d gr o u n d p i n . 2 out r e gula tor o utput. b y pass to gr ound with a 1 f or larger cap a citor . 3 in r e gula tor i n put. b y pass to gr ou nd with a 1 f or larger capa cito r .
adp3338 r e v. b | pa ge 6 o f 1 6 typical perf orm ance cha r acte ristics t a = 2 5 c , u n l e ss ot he r w i s e no t e d. i l = 0a input voltage (v) output voltage (v) 2.515 2.510 2.490 2.5 4.5 6.5 8.0 2.505 2.500 2.495 i l = 1a v out = 2.5v 02050-004 i l = 0.5a fi gure 4 . li ne regul a tio n o u tput vo l t a g e vs. input v o l t age output voltage (v) 2.504 2.503 2.499 2.502 2.501 2.500 2.498 2.497 2.496 2.495 02050-005 load current (a) 0 0.8 1.0 0.6 0.4 0.2 v in = 6v figure 5. output voltag e vs. load cu rrent input voltage (v) ground curre nt ( a) 0 0 48 50 100 150 200 250 300 02050-006 v out = 2.5v i load = 0a 26 figure 6. gr ound c u rre nt v s . supply v o ltag e output load (a) ground curre nt (ma) 0 0 0.2 0.4 0.6 0.8 v out = 2.5v v in = 6v 1.0 2 4 6 8 10 12 02050-007 figure 7. gr ound c u rre nt v s . load cur r ent i l = 0a i l = 0.5a i l = 1a v out = 2.5v v in = 6v i l = 0.3a i l = 0.7a junction temperature ( c) output voltage (%) ?0.05 ?40 ? 20 0 2 0 4 0 6 0 8 0 100 120 0 0.1 0.2 0.3 0.4 02050-008 fig u re 8. out p ut v o lt ag e v a ri at i o n % v s . junct i on te mpe r at ur e junction temperature ( c) ground curre nt (ma) 0 ?4 0 4 i load = 700ma i load = 500ma i load = 300ma i load = 1a ?20 0 20 40 60 80 100 120 140 160 6 8 10 12 14 16 18 2 02050-009 figure 9. gr ound c u rre nt v s . jun c tio n temp er ature
adp3338 r e v. b | pa ge 7 o f 1 6 load current (a) drop o ut (mv ) 250 200 0 0 0.2 1.0 0.4 0.6 0.8 150 100 50 v out = 2.5v 02050-010 fig u re 1 0 . d r op out v o lt ag e v s . lo ad c u rre nt 0 567 89 time (sec) v out = 2.5v i load = 1a input/output voltage (v) 0 1 2 3 02050-011 1 2 3 4 10 figure 11. power-u p /powe r -down 3.5 80 40 time ( s) v out = 2.5v c out = 1 f i load = 1a 120 160 200 240 4.5 2.50 2.49 2.51 volts 02050-012 fi gur e 12 . l i ne transi ent response 3.5 80 40 time ( s) v out = 2.5v c out = 10 f i load = 1a 120 160 200 240 4.5 2.50 2.49 2.51 volts 02050-013 fi gur e 13 . l i ne transi ent response 0 200 0 time ( s) 400 600 800 1000 1 2.5 2.4 2.6 volts 02050-014 a v in = 6v c out = 1 f fi gur e 14 . l o a d transi ent response 0 200 0 time ( s) 400 600 800 1000 1 2.5 2.4 2.6 volts 02050-015 a v in = 6v c out = 10 f fi gur e 15 . l o a d transi ent response
adp3338 r e v. b | pa ge 8 o f 1 6 v in = 6v 400m ? short full short 0 0.4 time (s) 0.6 0.8 1.0 0.5 0 2.5 volts 02050-016 a 1.0 1.5 figure 1 6 . sh ort-c i r c uit cu rre nt frequency (hz) 10 100 1k 10k 100k 1m v out = 2.5v c l = 10 f i l = 1a ?8 0 ?7 0 ?6 0 ?5 0 ?4 0 ?3 0 ?2 0 ?1 0 ?9 0 ?100 0 rip p l e re j e ction (db) 02050-017 c l = 1 f i l = 1a c l = 10 f i l = 0 c l = 1 f i l = 0 figure 17. power s u pply ripple reject ion c l ( f) r m s n o ise ( v) 250 200 0 01 0 50 20 30 40 150 100 50 300 i l = 1a i l = 0a 02050-018 figure 18. rms noise vs. c l frequency (hz) 10 100 1k 10k 100k 1m c l = 1 f 0.001 0.01 0.1 1 10 100 c l = 10 f volta ge n o ise spec tr a l d e n s ity ( v/ hz) 02050-019 fig u re 1 9 . out p ut nois e de ns it y (1 0 h z t o 10 0 k h z)
adp3338 r e v. b | pa ge 9 o f 1 6 theor y of opera tion the ad p3338 an ycap ld o us es a sin g le con t rol lo o p f o r re g u l a t i o n a n d r e fe re nc e f u nc t i o n s . t h e output vo lt age i s s e ns e d b y a r e sist i v e vo l t a g e divi der , co n s ist i n g o f r1 and r2, w h ich is va r i e d t o p r o v ide t h e a v a i l a b l e ou t p ut v o l t a g e opt i o n . f e e d b a ck is t a k e n f r o m t h is n e tw o r k b y w a y o f a s e r i es d i o d e (d1) an d a s e c o n d re s i stor d i v i d e r ( r 3 an d r 4 ) to t h e i n put of an am pl i f i e r . a v e r y hig h ga i n er r o r a m plif ier is us e d t o co n t r o l t h is lo o p . t h e a m p l i f ie r is co n s tr uct e d in s u ch a wa y tha t e q uili b r i u m p r o d uces a l a r g e, te m p e r atu r e - prop or t i on a l i n put of f s e t v o lt age t h a t i s re p e a t abl e a n d ve r y wel l c o n t ro l l e d . t h e te mp e r a t u r e - prop or - t i o n al o f fs et v o l t a g e is com b i n e d w i t h t h e com p lem e n t a r y dio d e v o l t a g e t o f o r m a vir t u a l ban d g a p v o l t a g e t h a t is im p l ic i t in t h e ne t w or k , a l t h ou g h it n e ve r app e ar s e x pl i c it ly i n t h e c i rc u i t . u l ti ma t e l y , th is pa t e n t ed d e si gn m a k e s i t pos s i b le t o co n t r o l th e lo o p wi t h o n ly o n e am plif ier . t h is t e chni q u e a l s o im p r o v es t h e n o is e ch a r ac t e r i st ics o f t h e a m plif ier b y p r o v id i n g m o r e f l exi - bi l i t y on t h e t r a d e of f of noi s e s o u r c e s t h a t l e a d s to a l o w noi s e desig n . t h e r 1 , r 2 d i v i d e r i s c h osen in th e sa m e ra ti o a s th e ba n d ga p v o l t a g e t o t h e ou t p ut v o l t a g e. a l t h o u g h t h e r1, r2 r e sis t o r divid e r is lo ade d b y d i o d e d1 a nd a s e co nd divid e r co n s ist i n g o f r3 a nd r4, t h e v a l u es can b e ch os e n t o p r o d uce a t e m p er a - t u re - s t a bl e out p ut . t h is uni q ue a r ra n g em en t s p eci f ical l y co rr ec ts fo r t h e lo adin g o f t h e divider , t h us a v o i din g t h e er r o r r e s u l t in g f r o m ba se curr e n t loa d in g in co n v en ti o n al ci r c ui t s . the p a te n t e d am plif ier co n t r o ls a ne w and un i q ue n o ni n v er t i ng dr i v er t h a t dr i v es t h e p a ss t r a n s i s t o r , q1. th e us e o f t h is s p e c i a l non i n v e r t i ng d r ive r e n abl e s t h e f r e q u e nc y c o m p e n s a t i on to in cl ude t h e lo ad ca p a ci t o r in a p o le-s pli t t i ng a r ra n g emen t t o achie v e r e d u ce d s e n s i t iv i t y t o t h e val u e , typ e , and es r o f t h e lo ad ca p a c i tan c e . m o s t ld o s place v e r y s t r i c t r e q u ir e m en ts o n t h e ra n g e o f es r val u es fo r t h e ou t p ut ca p a c i t o r b e c a us e t h e y a r e dif f i c u l t t o s t a b i l i z e d u e t o t h e u n cer t a i n t y o f lo ad ca p a ci t a n c e and r e sis- ta n c e . m o r e o v e r , th e es r v a l u e r e q u i r ed t o k eep co n v en ti o n al ld os st a b le ch a n ges dep e ndi ng o n lo ad an d te m p er a t ur e. t h ese es r li mi t a ti o n s mak e d e si gn i n g wi t h ld o s m o r e dif f i c u l t b e ca us e o f t h e i r un cle a r s p e c if ic a t io n s a nd ext r eme va r i a t io n s o v er tem p er a t ur e . w i t h t h e ad p3 338 a n ycap l d o , this is n o lo n g er tr ue . i t ca n be use d wi t h vi r t uall y a n y g o o d q u ali t y ca pa ci t o r , wi t h n o co n s t r a i n t o n t h e min i m u m esr . this in n o va t i ve desig n p r o v ides cir c ui t s t a b ili t y wi t h j u s t a smal l 1 f c a p a ci t o r o n t h e o u t p u t . a ddi ti o n al a d v a n t a g e s o f th e po le- s p l i t ti n g sch e m e in cl ude su p e r i or lin e n o is e r e j e c t io n an d ver y hig h r e gu la t o r ga in t o achie v e exce l l en t l i n e and lo ad r e gu l a t i on. an im p r es si ve 1.4% acc u rac y is gua r a n t e e d o v er line, lo ad , and t e m p era t ur e. a d di t i o n a l fe a t ur es o f t h e cir c u i t i n cl u d e c u r r e n t limi t and th e r m a l s h u t do wn . v in out adp3338 c1 1 f c2 1 f v out gnd in 02050-021 fig u re 2 0 . ty p i c a l a pplic at i o n c i r c uit ptat v os g m noninverting wideband driver input q1 adp3338 compensation capacitor attenuation (v bandgap /v out ) r1 d1 r2 r3 r4 output ptat current (a) gnd c load r load 02050-020 fig u re 2 1 . fun c t i on al bl ock d i ag ra m
adp3338 rev. b | page 10 of 16 appli c a t ion inf o rma t ion capacitor selection out p ut cap a c i tor t h e st a b i l it y an d t r ans i e n t re sp ons e of t h e l d o i s a f u n c t i on of th e ou t p u t c a p a ci t o r . th e ad p 3338 is s t a b le wi th a wide ra n g e o f c a pa c i t o r v a l u e s , t y pe s , a n d e s r ( a n y ca p ) . a c a pa ci t o r a s lo w as 1 f is t h e o n l y r e q u ir emen t fo r s t a b i l i t y . a hig h er c a - p a ci t a n c e ma y b e n e ce s s a r y if hi g h o u t p u t c u r r e n t s u rg es a r e an t i c i p a te d, or i f th e o u t p u t ca p a ci t o r c a nn o t be l o ca t e d n e a r th e o u t p ut and g r ou nd pins. t h e a d p33 38 is st ab l e wi t h ex t r e m ely lo w es r ca p a ci t o rs ( e s r 0 ) s u c h as m u l t ila y er cera mi c ca paci t o rs (ml c c ) o r osco n. n o t e tha t t h e e f f e c t i v e ca p a ci t a n c e o f s o m e c a p a ci t o r typ e s f a l l s b e lo w t h e mini m u m o v er te m p er a t ur e o r wi th d c v o l t a g e . inp u t capacit o r an in p u t b y p a ss ca p a ci t o r is n o t st r i c t ly r e q u ir e d , b u t is r e co m - m e nde d in an y a p plic a t ion i n v o lving lo n g i n p u t wir e s o r hig h s o ur ce i m p e dance. c o n n e c t i n g a 1 f ca p a c i to r f r o m t h e i n p u t t o g r o u n d r e d u c e s th e s e n s i t ivi t y o f th e cir c ui t to pc bo a r d la yo u t and i n p u t t r a n sien ts. i f a la rger o u t p u t ca p a ci t o r is n e cess a r y , a la rger val u e i n p u t c a p a ci t o r is r e commende d . outpu t cu rrent limi t the ad p3338 is s h o r t-c i r c ui t p r o t ec t e d b y limi tin g t h e p a s s t r a n sis t o r s b a s e dr i v e c u r r en t . the maxi m u m o u t p ut c u r r en t i s limi t e d t o a p p r o x ima t e l y 2 a (s e e f i gur e 16). thermal overload protection the ad p3338 is p r o t ec t e d a g a i n s t da ma g e d u e t o exces s i v e p o w e r diss i p a t i o n b y i t s t h er m a l o v erlo ad p r o t e c t i o n cir c u i t. ther mal p r o t e c t i o n li mi ts t h e die t e m p era t ur e to a maxim u m of 160c. u nder extr em e con d i t ion s , s u c h as hig h a m b i en t t e m p era t ur e and p o w e r dis s i p a t io n w h er e t h e die tem p era t ur e s t a r ts t o r i s e ab o v e 160c, t h e o u t p u t c u r r en t is r e d u ced u n til t h e di e t e m p era t ur e has dr o p p e d t o a s a fe le ve l . c u r r en t a nd t h e r ma l lim i t p r o t e c t i o n s a r e i n te nde d to p r o t e c t t h e de vi ce a g ainst acci den t a l o v erlo ad co ndi t i on s. f o r n o r m a l o p er a t ion, ex ter n a l ly limi t t h e p o w e r dissi p a t ion o f t h e d e v i ce s o t h e j u n c t i o n t e m p era t ur e do es n o t exce e d 1 50c. calculating power dissipation d e vice p o w e r d i ssi p a t ion is ca lc u l a t e d as p d = ( v in C v ou t ) i loa d + ( v in i gnd ) w h er e i loa d a nd i gnd a r e lo ad c u r r en t a nd g r o u nd c u r r en t, and v in a nd v ou t a r e t h e i n p u t and o u t p ut v o l t a g es, r e s p e c t i ve l y . a s sumi n g t h e wo rs t-cas e o p era t in g con d i t io ns ar e i lo a d = 1.0 a, i gn d = 10 ma, v in = 3.3 v , and v ou t = 2.5 v , the de vic e p o wer dissi p a t io n is p d = (3. 3 v C 2. 5 v) 10 00 ma + (3 .3 v 10 ma) = 833 mw s o , f o r a j u n c tion t e m p era t ur e of 125c a nd a maxim u m a m b i e n t t e m p era t ur e o f 85c, t h e r e q u ir e d t h er mal r e sis t a n ce f r om j u nc t i on t o am bi e n t i s c/w 48 w 833 . 0 c 85 c 125 = ? = ja printe d ci rcuit boar d lay o ut consi d era t io ns the t h er mal r e s i s t an ce , ja , o f th e s o t - 223 is det e r m in e d b y the s u m o f th e j u n c t i o n - t o - c a se a n d th e c a s e - t o - a m b i e n t th e r m a l r e sis t a n ces. th e j u n c tion-t o- cas e ther mal r e sis t a n c e , jc , is deter m i n e d b y t h e p a ck a g e desi g n a nd is sp e c if i e d a t 26.8 c/ w . h o w e v e r , t h e cas e -t o- am b i en t t h er mal r e sis t ance is deter m i n e d b y t h e p r i n te d c i r c ui t b o a r d des i g n . a s sho w n i n f i g u r e 22, t h e am oun t o f co p p er t o w h ich t h e ad p3338 is m o un t e d a f f e c t s ther mal p e r f o r ma n c e. w h en m o u n te d to t h e mini ma l p a ds of 2 oz. co p p er , a s sho w n in f i gur e 22 (a), ja is 126.6c/w . a d din g a smal l co p p er p a d u n der t h e ad p 3 338, as sh o w n in f i gure 2 2 ( b ), r e d u ces t h e ja to 102. 9c/w . i n creas i ng t h e c o p p er p a d t o one s q u a r e inch, as sho w n in f i gure 22 ( c ), re d u ces t h e ja e v e n f u r t her to 52 .8 c / w . 02050-022 c ab figure 22. pcb l a y o uts
adp3338 rev. b | page 11 of 16 use the following general guidelines when designing printed circuit boards: ? keep the output capacitor as close as possible to the output and ground pins. ? keep the input capacitor as close as possible to the input and ground pins. ? specify thick copper and use wide traces for optimum heat transfer. pc board traces with larger cross sectional areas remove more heat from the adp3338. ? decrease thermal resistance by adding a copper pad under the adp3338, as shown in figure 22 (b). ? use the adjacent area to the adp3338 to add more copper around it. connecting the copper area to the output of the adp3338, as shown in figure 22 (c), is best, but thermal performance will be improved even if it is connected to other signals. ? use additional copper layers or planes to reduce the thermal resistance. again, connecting the other layers to the output of the adp3338 is best, but is not necessary. when connecting the output pad to other layers, use multiple vias.
adp3338 rev. b | page 12 of 16 outline dimensions seating plane 4.60 bsc 10 max 16 10 16 10 3 2 1 2.30 bsc 0.84 0.76 0.66 6.50 bsc 1.70 1.60 1.50 1.05 0.85 0.10 0.02 1.30 1.10 0.35 0.30 0.23 3.10 3.00 2.90 3.70 3.50 3.30 7.30 7.00 6.70 compliant to jedec standards to-261-aa fig u re 2 3 . 3-le ad s m a l l out l ine tr ans i s t or p a ck ag e [sot- 2 2 3 ] (k c-3) dim e nsio ns sho w n i n mi ll im e t er s
adp3338 rev. b | page 13 of 16 ordering guide model temperature range output voltage (v) package option package description adp3338akc-1.5-rl C40c to +85c 1.5 kc-3 3-lead sot-223 adp3338akc-1.5-rl7 C40c to +85c 1.5 kc-3 3-lead sot-223 adp3338akcz-1.5-rl 1 C40c to +85c 1.5 kc-3 3-lead sot-223 adp3338akcz-1.5-rl7 1 C40c to +85c 1.5 kc-3 3-lead sot-223 adp3338akc-1.8-rl C40c to +85c 1.8 kc-3 3-lead sot-223 adp3338akc-1.8-rl7 C40c to +85c 1.8 kc-3 3-lead sot-223 adp3338akcz-1.8-rl 1 C40c to +85c 1.8 kc-3 3-lead sot-223 adp3338akcz-1.8-r7 1 C40c to +85c 1.8 kc-3 3-lead sot-223 adp3338akc-2.5-rl C40c to +85c 2.5 kc-3 3-lead sot-223 adp3338akc-2.5-rl7 C40c to +85c 2.5 kc-3 3-lead sot-223 adp3338akcz-2.5-rl 1 C40c to +85c 2.5 kc-3 3-lead sot-223 adp3338akcz-2.5rl7 1 C40c to +85c 2.5 kc-3 3-lead sot-223 adp3338akc-2.85-rl C40c to +85c 2.85 kc-3 3-lead sot-223 adp3338akc-2.85-rl7 C40c to +85c 2.85 kc-3 3-lead sot-223 adp3338akcz-2.85r7 1 C40c to +85c 2.85 kc-3 3-lead sot-223 adp3338akc-3-rl C40c to +85c 3.0 kc-3 3-lead sot-223 adp3338akc-3-rl7 C40c to +85c 3.0 kc-3 3-lead sot-223 adp3338akcz-3-rl7 1 C40c to +85c 3.0 kc-3 3-lead sot-223 adp3338akc-3.3-rl C40c to +85c 3.3 kc-3 3-lead sot-223 adp3338akc-3.3-rl7 C40c to +85c 3.3 kc-3 3-lead sot-223 adp3338akcz-3.3-rl 1 C40c to +85c 3.3 kc-3 3-lead sot-223 adp3338akcz-3.3rl7 1 C40c to +85c 3.3 kc-3 3-lead sot-223 adp3338akc-5-reel C40c to +85c 5 kc-3 3-lead sot-223 adp3338akc-5-reel7 C40c to +85c 5 kc-3 3-lead sot-223 adp3338akcz-5-reel 1 C40c to +85c 5 kc-3 3-lead sot-223 adp3338akcz-5-r7 1 C40c to +85c 5 kc-3 3-lead sot-223 1 z = pb-free part.
adp3338 rev. b | page 14 of 16 notes
adp3338 rev. b | page 15 of 16 notes
adp3338 rev. b | page 16 of 16 notes ? 2005 analo g de vices, inc. all rights reserve d . tra d em arks and registered tra d ema r ks are the prop erty of their respective owners . c02050C0 C 6/05(b)

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