View AME5250_8374729.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

ame 1 AME5250 rev .b.04 1a, 1.5mhz synchronous ste p-down converter the AME5250 is a high ef f iciency monolithic synchro- nous buck regulator using a con sta nt frequency , current mode archite cture. ca pa ble of delivering 1a output cur- rent over a wide in put voltage ra nge from 2.5v to 5.5v , the AME5250 is ide ally suited f or single li-ion battery powered a pplication s. 100% duty cycle provide s low dropout operation, extending battery life in portable sys-te ms. u nder light loa d condition s, the AME5250 oper- ates in a power saving mode that consumes just around20 m a of supply current, maximizing battery life in por- ta ble a pplication s. the intern al synchronous switch incre a se s ef f iciency a nd eli min ate s the need f or a n extern al schottky diode. low output voltage s are e a sily supported with the 0.6v feedba ck reference voltage. the AME5250 is availa ble in small df n-6d & qf n-16c pa ck age s. other features include soft start, lower internal refer- ence voltage with 2% a ccura cy , over te mperature prote c- tion, a nd over current prote ction. n general de scri ption n fe ature s n application s n t ypical application fixed output v oltage figure 1. high efficiency step-down converter adjusta ble output v oltage figure 2. 1.8v at 1000ma step-down requlator c fw d : 22pf~220pf 2 . 2 m h c i n 4 . 7 m f c e r a m e 5 2 5 0 i n s w o u t e n g n d c o u t 1 0 m f c e r v i n v o u t l cellular t ele phone s l person al inf ormation appli a nce s l w irele ss a nd dsl mode ms l mp3 players l portable instruments l high efficiency: up to 95% l v ery low 20 m a quie scent current l high efficiency in light load condition l 2.5v to 5.5v in put ra nge l adjusta ble output from 0.6v to v in l 1.0v , 1.2v , 1.5v , 1.6v , 1.8v , 2.5v a nd 3.3v fixed/adjusta ble output v oltage l 1a output current l low dropout operation: 100% duty cycle l no schottky diode required l 1.5mhz con sta nt frequency pwm operation l small df n-6d & qf n-16c pa ck age s l all ame ? s le a d free product meet rohs sta ndard v o u t = v f b ( r 1 + r 2 ) / r 2 2 . 2 m h c i n 4 . 7 m f c e r a m e 5 2 5 0 i n s w f b e n g n d c o u t 1 0 m f c e r v i n 2 . 5 v t o 5 . 5 v 1 . 8 v 1 0 0 0 m a c f w d r 1 1 5 0 k r 2 7 5 k v o u t
ame 2 1a, 1.5mhz synchronous ste p-down converter AME5250 rev . b.04 n function block di agra m figure 3. founction block di agra m 0 . 6 v v r e f 0 . 6 v 0 . 5 5 v 6 m o d e s e l e c t s l o p e c o m p s o f t s t a r t o s c u v d e t p w m c o m p l o g i c n m o s c o m p i r c o m p v i n e n f b / v o u t 2 3 i n 4 s w 5 g n d c o n s t a n t o f f - t i m e
ame 3 AME5250 rev .b.04 1a, 1.5mhz synchronous ste p-down converter AME5250-a vyxxx 1. nc 2. en 3. in 4. sw 5. gnd 6. fb/out * die attach: conductive epoxy df n-6d (2mmx2mmx0.75mm) t op v iew n pin configuration 6 5 4 1 2 3 a m e 5 2 5 0 note: the are a enclosed by da shed line re pre sents exposed pa d a nd conne ct to gnd. qf n-16c (3mmx3mmx0.75mm) t op v iew AME5250-a wexxx 1. gnd 2. gnd 3. gnd 4. fb/out 5. gnd 6. nc 7. en 8. nc * die attach: conductive epoxy 9. in 10. in 1 1. in 12. in 13. sw 14. sw 15. sw 16. nc n pin de scri ption a m e 5 2 5 0 1 2 3 4 9 1 0 1 1 1 2 5 6 7 8 1 3 1 4 1 5 1 6 d f n q f n 1 6 , 8 , 1 6 n c n o c o n n e c t i o n . n o t i n t e r n a l l y c o n n e c t e d . c a n l e f t f l o a t i n g o r c o n n e c t e d t o g n d . 2 7 e n e n a b l e c o n t r o l i n p u t , a c t i v e h i g h . 3 9 , 1 0 , 1 1 , 1 2 i n i n p u t s u p p l y v o l t a g e p i n . b y p a s s t h i s p i n w i t h a c a p a c i t o r a s c l o s e t o t h e d e v i c e a s p o s s i b l e . 4 1 3 , 1 4 , 1 5 s w s w i t c h n o d e c o n n e c t i o n t o i n d u c t o r . 5 1 , 2 , 3 , 5 g n d g r o u n d . t i e d i r e c t l y t o g r o u n d p l a n e . 6 4 f b / o u t o u t p u t v o l t a g e f e e d b a c k i n p u t . p i n d e s c r i p t i o n p i n n a m e p i n n u m b e r
ame 4 1a, 1.5mhz synchronous ste p-down converter AME5250 rev . b.04 n ordering information a 1 . n c v : d f n y : 6 1 0 0 : 1 . 0 v ( d f n - 6 d ) 2 . e n w : q f n e : 1 6 1 2 0 : 1 . 2 v 3 . i n 1 5 0 : 1 . 5 v 4 . s w 1 6 0 : 1 . 6 v 5 . g n d 1 8 0 : 1 . 8 v 6 . f b / o u t 2 5 0 : 2 . 5 v 3 3 0 : 3 . 3 v a 1 . g n d a d j : a d j u s t a b l e ( q f n - 1 6 c ) 2 . g n d 3 . g n d 4 . f b / o u t 5 . g n d 6 . n c 7 . e n 8 . n c 9 . i n 1 0 . i n 1 1 . i n 1 2 . i n 1 3 . s w 1 4 . s w 1 5 . s w 1 6 . n c p i n c o n f i g u r a t i o n & s p e c i a l f e a t u r e p a c k a g e t y p e n u m b e r o f p i n s o u t p u t v o l t a g e number of pins pa ck age t ype pin configuration & special feature AME5250 - x x x xxx output v oltage
ame 5 AME5250 rev .b.04 1a, 1.5mhz synchronous ste p-down converter n absolute m axi mum ratings caution: stre ss a bove the listed a bsolute maxi mum rating may cause perma nent da mage to the device. * hbm b: 2000v~3999v p a r a m e t e r s y m b o l m a x i m u m u n i t i n p u t s u p p l y v o l t a g e v i n - 0 . 3 t o 6 . 5 e n , v o u t v o l t a g e v e n , v o u t - 0 . 3 t o v i n s w v o l t a g e v s w - 0 . 3 t o v i n e s d c l a s s i f i c a t i o n v b * n a vaila ble opetion s note:1. the f irst 1 or 2 pla ce s re pre sent product code. it is a ssigned by ame such a s a or am. 2. y is ye ar code a nd is the la st number of a ye ar . such a s the ye ar code of 2008 is 8. 3. a bar on top of f irst letter re pre sents green part such a s 5250 or a5250. 4. the la st 3 pla ce s m xx re pre sent m arking code. it contain s m a s date code in "month", xx a s ln code a nd that is f or ame intern al use only . ple a se refer to date code rule se ction f or detail inf ormation. 5. ple a se con sult ame sale s of f ice or authorized re p./distributor f or the availa bility of output voltage a nd pa ck age type. p a r t n u m b e r m a r k i n g * o u t p u t v o l t a g e p a c k a g e o p e r a t i n g a m b i e n t t e m p e r a t u r e r a n g e a m e 5 2 5 0 - a v y a d j 5 2 5 0 a m x x a d j d f n - 6 d - 4 0 o c t o + 8 5 o c a m e 5 2 5 0 - a v y 1 2 0 5 2 5 0 b m x x 1 . 2 v d f n - 6 d - 4 0 o c t o + 8 5 o c a m e 5 2 5 0 - a v y 1 8 0 5 2 5 0 c m x x 1 . 8 v d f n - 6 d - 4 0 o c t o + 8 5 o c a m e 5 2 5 0 - a v y 3 3 0 5 2 5 0 d m x x 3 . 3 v d f n - 6 d - 4 0 o c t o + 8 5 o c a m e 5 2 5 0 - a w e a d j a 5 2 5 0 a m y m x x a d j q f n - 1 6 c - 4 0 o c t o + 8 5 o c
ame 6 1a, 1.5mhz synchronous ste p-down converter AME5250 rev . b.04 n thermal information * me a sure q jc on ba ck side center of exposed pa d. ** mil-st d-202g 210f n re commended operating condition s p a r a m e t e r s y m b o l r a t i n g u n i t s u p p l y v o l t a g e v o l t a g e v i n 2 . 5 t o 5 . 5 v a m b i e n t t e m p e r a t u r e r a n g e t a - 4 0 t o + 8 5 o c j u n c t i o n t e m p e r a t u r e r a n g e t j - 4 0 t o + 1 2 5 o c p a r a m e t e r p a c k a g e d i e a t t a c h s y m b o l m a x i m u m u n i t t h e r m a l r e s i s t a n c e * ( j u n c t i o n t o c a s e ) q j c 8 5 t h e r m a l r e s i s t a n c e ( j u n c t i o n t o a m b i e n t ) q j a 1 6 0 i n t e r n a l p o w e r d i s s i p a t i o n p d 6 2 5 m w t h e r m a l r e s i s t a n c e * ( j u n c t i o n t o c a s e ) q j c 6 7 t h e r m a l r e s i s t a n c e ( j u n c t i o n t o a m b i e n t ) q j a 1 4 9 i n t e r n a l p o w e r d i s s i p a t i o n p d 6 7 0 m w 3 5 0 o c o c / w s o l d e r i r o n ( 1 0 s e c ) * * d f n - 6 d c o n d u c t i v e e p o x y q f n - 1 6 c c o n d u c t i v e e p o x y o c / w
ame 7 AME5250 rev .b.04 1a, 1.5mhz synchronous ste p-down converter n ele ctrical spe cif ication s v in =3.6v , v out =2.5v , v fb =0.6v , l=2.2 m h, c in =4.7 m f , c out =10 m f , t a =25 o c, i max =1a unle ss otherwise spe cif ied. p a r a m e t e r s y m b o l m i n t y p m a x u n i t s i n p u t v o l t a g e v i n 2 . 5 5 . 5 v o u t p u t v o l t a g e a c c u r a c y d v o u t - 3 3 % a d j u s t a b l e o u t p u t r a n g e v o u t v f b v i n - 0 . 2 v f e e d b a c k v o l t a g e v f b 0 . 5 8 8 0 . 6 0 . 6 1 2 v f e e d b a c k p i n b i a s c u r r e n t i f b - 5 0 5 0 n a q u i e s c e n t c u r r e n t ( f o r a d j u s t a b l e o u t p u t v o l t a g e ) i q 2 0 3 5 m a q u i e s c e n t c u r r e n t ( f o r f i x e d o u t p u t v o l t a g e ) i q 3 5 4 0 m a s h u t d o w n c u r r e n t i s h d n 0 . 1 1 m a s w i t c h f r e q u e n c y f o s c 1 . 2 1 . 5 1 . 8 m h z h i g h - s i d e s w i t c h o n - r e s i s t a n c e r d s , o n , l h i 0 . 2 8 w l o w - s i d e s w i t c h o n - r e s i s t a n c e r d s , o n , l o 0 . 2 5 w s w i t c h c u r r e n t l i m i t i s w , c l 1 . 4 1 . 6 a e n h i g h ( e n a b l e d t h e d e v i c e ) v e n , h i 1 . 5 v e n l o w ( s h u t d o w n t h e d e v i c e ) v e n , l o 0 . 4 v i n p u t u n d e r v o l t a g e l o c k o u t v u v l o 1 . 8 v i n p u t u n d e r v o l t a g e l o c k o u t h y s t e r e s i s v u v l o , h y s t 0 . 1 v t h e r m a l s h u t d o w n t e m p e r a t u r e o t p 1 6 0 o c m a x i m u m d u t y c y c l e d m a x 1 0 0 % s w l e a k a g e c u r r e n t - 1 1 m a e n = 0 v , v i n = 5 . 0 v v s w = 0 v o r 5 . 0 v t e s t c o n d i t i o n i s w = 2 0 0 m a , v i n = 3 . 6 v v i n = 2 . 5 t o 5 . 5 v , i n p w m m o d e f o r f i x e d o u t p u t v o l t a g e f o r a d j u s t a b l e o u t p u t v o l t a g e v f b = v i n i o u t = 0 m a , v f b = 1 v i o u t = 0 m a , i n p f m m o d e v i n = 2 . 5 t o 5 . 5 v r i s i n g e d g e s h u t d o w n , t e m p e r a t u r e i n c r e a s i n g v e n = g n d i s w = 2 0 0 m a , v i n = 3 . 6 v v i n = 2 . 5 t o 5 . 5 v v i n = 2 . 5 t o 5 . 5 v
ame 8 1a, 1.5mhz synchronous ste p-down converter AME5250 rev . b.04 main control loopAME5250 use s a con sta nt frequency , current mode ste p-down archite cture. both the main (p-cha nnel mosfet) a nd synchronous (n-cha nnel mosfet) switche s are intermal. during normal operation, the inter- n al top power mosfet is turned on e a ch cycle when the oscillator sets the rs latch, a nd turned of f when the cur- rent comparator resets the rs latch. while the topmosfet is off, the bottom mosfet is turned on until e ither the inductor current starts to reverse a s indicated by the current reversal comparator ircmp . short-circuit protectionwhen the output is shorted to ground, the frequency of the oscillator is reduced to about 180khz. this frequencyf oldba ck en sure s that the inductor current hsa more ti me do de cay , thereby preventing run away . the oscillator ? s frequency will progre ssively incre a se to 1.5mhz when v fb or v out rise s a bove 0v . dropout operationas the in put supply voltage de cre a se s to a value a p- proa ching the output voltage, the duty cycle incre a se s to- ward the maximum on-time. further reduction of the sup-ply voltage forces the main switch to remain on for more tha n one cycle until it re a che s 100% duty cycle. the output voltage will then be determined by the input voltageminus the voltage drop a cross the p-cha nnel mosfet a nd the inductor . the ba sic AME5250 a pplication circuit is shown in t ypi- cal application circuit. extern al component sele ction is determined by the maxi mum loa d current a nd begin s with the sele ction of the inductor value a nd f ollowed by c in a nd c out . inductor selectionfor a given in put a nd output voltage, the inductor value a nd operating frequency determine the ri pple current. the ri pple current dil incre a se s with higher v in a nd de cre a se s with higher inducta nce. a re a son a ble starting point f or setting ri pple current is d i l =0.4(lmax). the dc current rating of the inductor should be at le a st equal to the maxi mum loa d current plus hal f the ripple current to prevent core saturation. for betteref f iciency , choose a low dc-re sista nce inductor . c in and c out selection the in put ca pa cita nce, c in is needed to f ilter the tra p- ezoidal current at the source of the top mosfet . t o pre- vent large voltage tra n sients, a low esr in put ca pa citorsized f or the maxi mum rms current must be used. the maxi mum rms ca pa citor current is given by: this f ormula ha s a maxi mum at v in =2v out , where i rms =i out /2. this si mple worst-ca se condition is commonly used f or de sign be cause even signif ica nt devi ation s do not of fer much relief. note that the ca pa citor ma nufa cturer ri pple current ratings are often ba sed on 2000 hours of life. this ma ke s it a dvisa ble to further derate the ca pa citor , or choose a ca pa citor rated at a higher te mperature tha n re- quired. n detailed de scri ption n application inf ormation 1 ) ( - = o u t n i i n o u t m a x o u t r m s v v v v i i ) 1 ( 1 i n o u t o u t l v v v l f i - = d
ame 9 AME5250 rev .b.04 1a, 1.5mhz synchronous ste p-down converter the selection of c out is determined by the effective se- rie s re sista nce(esr) that is required to mini mize voltage ri pple a nd loa d ste p tra n sients. the output ri pple, v out , is determined by: using cera mic in put a nd output ca pa citors higher value s, lower cost cera mic ca pa citors are now be coming availa ble in smaller ca se size s. the ir high ri pple current, high voltage rating a nd low esr ma ke the m ide al f or switching regulator a pplication s. however , care must be ta ken when the se ca pa citors are used at the in put a nd output. when a cera mic ca pa citor is used at the in put a nd the power is supplied by a wall a da pter through long wire s, a loa d ste p at the output ca n induce ringing at the in put, v in . at be st, this ringing ca n couple to the output a nd be mista ken a s loop in sta bility . at worst, a sudden inrush of current through the long wire s ca n potenti ally cause a volt- age spike at v in large enough to da mage the part. output v oltage progra mming the output voltage is set by a n extern al re sistive divider a ccording to the f ollowing equation: where v ref equals to 0.6v typical. the resistive divider allows the fb pin to sen se a fra ction of the output voltage a s shown in figure 4. thermal considerations in most a pplication s the AME5250 doe s not dissi pate much he at due to its high ef f iciency . but, in a pplication s where the AME5250 is running at high a mbient te mpera- ture with low supply voltage a nd high duty cycle s, such a s in dropout, the heat dissipated may exceed the maximumjunction temperature of the part. if the junction tempera- ture re a che s a pproxi mately 160 o c, both power switche s will be turned of f a nd the sw node will be come high i m- peda nce. t o avoid the AME5250 from exceeding the maxi- mum junction temperature, the user will need to do somethermal a n alysis. the goal of the thermal a n alysis is to determine whether the power dissipated exceeds themaximum junction temperature of the part. the tempera- ture rise is given by: where pd is the power dissi pated by the regulator a nd q ja is the thermal re sista nce from the junction of the die to the a mbient te mperature. + = 2 1 1 r r v v r e f o u t r 1 r 2 5 . 5 v v o u t 0 . 6 v a m e 5 2 5 0 f b g n d figure 4. setting the AME5250 output v oltage ) ) ( ( j a r p d t q = + d @ d o u t l o u t f c e s r i v 8 1
ame 10 1a, 1.5mhz synchronous ste p-down converter AME5250 rev . b.04 figure 5. 1.2v step-down regulator c fw d : 22pf~220pf figure 6. 1.5v step-down regulator c fw d : 22pf~220pf figure 7. 2.5v step-down regulator c fw d : 22pf~220pf figure 8. 1.6v step-down regulator c fw d : 22pf~220pf figure 9. 3.3v step-down regulator c fw d : 22pf~220pf 2 . 2 m h a m e 5 2 5 0 i n s w f b e n g n d c o u t 1 0 m f c e r v i n 2 . 5 v t o 5 . 5 v v o u t 1 . 6 v c i n 4 . 7 m f c e r 1 5 0 k 9 0 k c f w d 2 . 2 m h a m e 5 2 5 0 i n s w f b e n g n d c o u t 1 0 m f c e r v i n 3 . 6 v t o 5 . 5 v v o u t 3 . 3 v c i n 4 . 7 m f c e r 1 5 0 k 3 3 . 3 k c f w d 2 . 2 m h a m e 5 2 5 0 i n s w f b e n g n d c o u t 1 0 m f c e r v i n 2 . 5 v t o 5 . 5 v v o u t 1 . 2 v c i n 4 . 7 m f c e r 1 5 0 k c f w d 1 5 0 k 2 . 2 m h a m e 5 2 5 0 i n s w f b e n g n d c o u t 1 0 m f c e r v i n 3 . 3 v t o 5 . 5 v v o u t 1 . 5 v c i n 4 . 7 m f c e r 1 5 0 k 1 0 0 k c f w d 2 . 2 m h a m e 5 2 5 0 i n s w f b e n g n d c o u t 1 0 m f c e r v i n 2 . 7 v t o 5 . 5 v v o u t 2 . 5 v c i n 4 . 7 m f c e r 1 5 0 k 4 7 . 3 k c f w d
ame 11 AME5250 rev .b.04 1a, 1.5mhz synchronous ste p-down converter 2 3 6 5 4 e n v i n f b g n d s w c i n m u s t b e p l a c e d b e t w e e n v d d a n d g n d a s c l o s e r a s p o s s i b l e c i n l 1 c o u t s w s h o u l d b e c o n n e c t e d t o i n d u c t o r b y w i d e a n d s h o r t t r a c e , k e e p s e n s i t i v e c o m p o n e n t s a w a y f r o m t h i s t r a c e a m e 5 2 5 0 n c 1 r 1 r 2 o u t p u t c a p a c i t o r m u s t b e n e a r a m e 5 2 5 0 c 1 o u t p u t c a p a c i t o r m u s t b e n e a r a m e 5 2 5 0 2 3 6 5 4 e n v i n v o u t g n d s w c i n m u s t b e p l a c e d b e t w e e n v d d a n d g n d a s c l o s e r a s p o s s i b l e c i n l 1 c o u t s w s h o u l d b e c o n n e c t e d t o i n d u c t o r b y w i d e a n d s h o r t t r a c e , k e e p s e n s i t i v e c o m p o n e n t s a w a y f r o m t h i s t r a c e a m e 5 2 5 0 n c 1 pc board layout checklist when laying out the printed circuit board, the following checklist should be used to ensure proper operation of the AME5250. the se ite ms are also illustrated gra phically in figure s 10 a nd figure s 1 1 . che ck the f ollowing in your layout: 1. the power tra ce s, con sisting of the gnd tra ce, the sw tra ce a nd the v in tra ce should be ke pt short, dire ct a nd wide. 2. doe s the v fb pin conne ct dire ctly to the feedba ck re sistors? the re sistive divider r2/r1 must be conne cted between the (+) plate of c out a nd ground. 3. doe s the (+) plate of cin conne ct to v in a s closely a s possible? this ca pa citor provide s the ac current to the intern al power mosfet s. 4. kee p the switching node, sw , away from the sen sitive v fb node. 5. kee p the (-) plate s of c in a nd c out a s close a s possible. c o u t i n a m e 5 2 5 0 v i n c i n f b g n d e n n c s w v o u t l 1 c 1 r 1 r 2 figure 10. AME5250 adjusta ble v oltage regulator layout di agra m figure 1 1. AME5250 fixed v oltage regulator layout di agra m c o u t i n a m e 5 2 5 0 v i n c i n o u t g n d e n n c s w v o u t l 1 c o u t
ame 12 1a, 1.5mhz synchronous ste p-down converter AME5250 rev . b.04 n application inf ormation s u p p l i e r i n d u c t a n c e ( m m m m h ) c u r r e n t r a t i n g ( m a ) d c r ( m w w w w ) d i m e n s i o n s ( m m ) s e r i e s t a i y o y u d e n 2 . 2 1 4 8 0 6 0 3 . 0 0 x 3 . 0 0 x 1 . 5 0 n r 3 0 1 5 g o t r e n d 2 . 2 1 5 0 0 5 8 3 . 8 5 x 3 . 8 5 x 1 . 8 0 g t s d 3 2 s u m i d a 2 . 2 1 5 0 0 7 5 4 . 5 0 x 3 . 2 0 x 1 . 5 5 c d r h 2 d 1 4 s u m i d a 4 . 7 1 0 0 0 1 3 5 4 . 5 0 x 3 . 2 0 x 1 . 5 5 c d r h 2 d 1 4 t a i y o y u d e n 4 . 7 1 0 2 0 1 2 0 3 . 0 0 x 3 . 0 0 x 1 . 5 0 n r 3 0 1 5 g o t r e n d 4 . 7 1 1 0 0 1 4 6 3 . 8 5 x 3 . 8 5 x 1 . 8 0 g t s d 3 2 c a p a c i t a n c e ( m m m m h ) p a c k a g e 4 . 7 6 0 3 4 . 7 6 0 3 4 . 7 6 0 3 1 0 6 0 3 1 0 8 0 5 1 0 8 0 5 1 0 8 0 5 1 0 8 0 5 t a b l e 2 . r e c o m m e n d e d c a p a c i t o r s f o r c i n a n d c o u t g r m 2 1 9 r 6 0 j 1 0 6 m e 1 9 g r m 2 1 9 r 6 0 j 1 0 6 k e 1 9 j m k 2 1 2 b j 1 0 6 r d t a b l e 1 . r e c o m m e n d e d i n d u c t o r s t d k m u r a t a t a i y o y u d e n t a i y o y u d e n t d k m u r a t a m u r a t a t a i y o y u d e n c 1 6 0 8 j b 0 j 4 7 5 m g r m 1 8 8 r 6 0 j 4 7 5 k e 1 9 j m k 1 0 7 b j 4 7 5 r a j m k 1 0 7 b j 1 0 6 m a e x t e r n a l c o m p o n e n t s s e l e c t i o n s u p p l i e r p a r t n u m b e r c 2 0 1 2 j b 0 j 1 0 6 m
ame 13 AME5250 rev .b.04 1a, 1.5mhz synchronous ste p-down converter n chara cterization curve efficiency vs. output current efficiency vs. output current efficiency vs. output current efficiency vs. output current 4 0 5 0 6 0 7 0 8 0 9 0 1 0 0 0 . 1 1 1 0 1 0 0 1 0 0 0 o u t p u t c u r r e n t ( m a ) e f f i c i e n c y ( % ) v i n = 2 . 7 v v o u t = 2 . 5 v c o u t = 1 0 m f l = 2 . 2 m h 4 0 5 0 6 0 7 0 8 0 9 0 1 0 0 0 . 1 1 1 0 1 0 0 1 0 0 0 o u t p u t c u r r e n t ( m a ) e f f i c i e n c y ( % ) v i n = 3 . 6 v v o u t = 2 . 5 v c o u t = 1 0 m f l = 2 . 2 m h 4 0 5 0 6 0 7 0 8 0 9 0 1 0 0 0 . 1 1 1 0 1 0 0 1 0 0 0 o u t p u t c u r r e n t ( m a ) e f f i c i e n c y ( % ) v i n = 2 . 7 v v o u t = 1 . 5 v c o u t = 1 0 m f l = 2 . 2 m h 4 0 5 0 6 0 7 0 8 0 9 0 1 0 0 0 . 1 1 1 0 1 0 0 1 0 0 0 o u t p u t c u r r e n t ( m a ) e f f i c i e n c y ( % ) v i n = 3 . 6 v v o u t = 1 . 5 v c o u t = 1 0 m f l = 2 . 2 m h efficiency vs. output current efficiency vs. output current 4 0 5 0 6 0 7 0 8 0 9 0 1 0 0 0 . 1 1 1 0 1 0 0 1 0 0 0 o u t p u t c u r r e n t ( m a ) e f f i c i e n c y ( % ) v i n = 5 . 5 v v o u t = 1 . 2 v c o u t = 1 0 m f l = 2 . 2 m h 4 0 5 0 6 0 7 0 8 0 9 0 1 0 0 0 . 1 1 1 0 1 0 0 1 0 0 0 o u t p u t c u r r e n t ( m a ) e f f i c i e n c y ( % ) v i n = 2 . 5 v v o u t = 1 . 2 v c o u t = 1 0 m f l = 2 . 2 m h
ame 14 1a, 1.5mhz synchronous ste p-down converter AME5250 rev . b.04 n chara cterization curve (contd.) 0 . 5 8 0 0 . 5 8 5 0 . 5 9 0 0 . 5 9 5 0 . 6 0 0 0 . 6 0 5 0 . 6 1 0 0 . 6 1 5 0 . 6 2 0 - 5 0 - 2 5 0 + 2 5 + 5 0 + 7 5 + 1 0 0 + 1 2 5 r e f e r e n c e v o l t a g e ( v ) t e m p e r a t u r e ( o c ) v i n = 3 . 6 v reference v oltage vs. t e mperature 1 . 1 0 1 . 1 5 1 . 2 0 1 . 2 5 1 . 3 0 1 . 3 5 1 . 4 0 1 . 4 5 1 . 5 0 1 . 5 5 1 . 6 0 1 . 6 5 1 . 7 0 - 5 0 - 2 5 0 + 2 5 + 5 0 + 7 5 + 1 0 0 + 1 2 5 f r e q u e n c y ( m h z ) t e m p e r a t u r e ( o c ) v i n = 3 . 6 v frequency vs. t e mperature frequency vs. supply v oltage output v oltage vs. output current 1 . 1 0 1 . 1 5 1 . 2 0 1 . 2 5 1 . 3 0 1 . 3 5 1 . 4 0 1 . 4 5 1 . 5 0 1 . 5 5 1 . 6 0 1 . 6 5 1 . 7 0 2 . 5 3 . 0 3 . 5 4 . 0 4 . 5 5 . 0 5 . 5 v i n ( v ) f r e q u e n c y ( m h z ) 1 . 7 7 1 . 7 8 1 . 7 9 1 . 8 0 1 . 8 1 1 . 8 2 1 . 8 3 1 . 8 4 1 . 8 5 1 . 8 6 1 . 8 7 1 . 8 8 1 . 8 9 1 . 9 0 1 0 0 2 0 0 3 0 0 4 0 0 5 0 0 6 0 0 7 0 0 8 0 0 9 0 0 1 0 0 0 v o u t = 1 . 8 v o u t p u t c u r r e n t ( m a ) o u t p u t v o l t a g e ( v ) v i n = 3 . 6 v current li mit vs. t e mperature 1 . 3 1 . 4 1 . 5 1 . 6 1 . 7 1 . 8 1 . 9 2 . 0 2 . 1 2 . 2 2 . 3 2 . 4 2 . 5 2 . 6 2 . 7 2 . 8 2 . 9 3 . 0 - 4 0 - 2 5 - 1 0 + 5 + 2 0 + 3 5 + 5 0 + 6 5 + 8 0 + 9 5 + 1 1 0 + 1 2 5 c u r r e n t l i m i t ( a ) t e m p e r a t u r e ( o c ) v i n = 3 . 3 v v o u t = 1 . 2 v current li mit vs. t e mperature 1 . 3 1 . 4 1 . 5 1 . 6 1 . 7 1 . 8 1 . 9 2 . 0 2 . 1 2 . 2 2 . 3 2 . 4 2 . 5 2 . 6 2 . 7 2 . 8 2 . 9 3 . 0 - 4 0 - 2 5 - 1 0 + 5 + 2 0 + 3 5 + 5 0 + 6 5 + 8 0 + 9 5 + 1 1 0 + 1 2 5 c u r r e n t l i m i t ( a ) t e m p e r a t u r e ( o c ) v i n = 3 . 6 v v o u t = 1 . 2 v
ame 15 AME5250 rev .b.04 1a, 1.5mhz synchronous ste p-down converter n chara cterization curve (contd.) light load mode output v oltage ri pple power off from en v in = 3.6v v out = 1.8v i out = 50ma 1) v sw = 5v/div 2) v out = 100mv/div 3) i l = 200ma/div v in = 3.6v v out = 1.8v i out = 1a 1) en = 2v/div 2) v out = 2v/div 3) i l = 500ma/div load step v in = 3.6v v out = 1.8v i out = 0a~1a~0a 1) v out = 100mv/div 2) i out = 500ma/div current li mit vs. t e mperature 1 . 3 1 . 4 1 . 5 1 . 6 1 . 7 1 . 8 1 . 9 2 . 0 2 . 1 2 . 2 2 . 3 2 . 4 2 . 5 2 . 6 2 . 7 2 . 8 2 . 9 3 . 0 - 4 0 - 2 5 - 1 0 + 5 + 2 0 + 3 5 + 5 0 + 6 5 + 8 0 + 9 5 + 1 1 0 + 1 2 5 v i n = 5 . 0 v v o u t = 1 . 2 v t e mperature ( o c) current limit (a) 5 m s/div 50 m s/div 40 m s/div
ame 16 1a, 1.5mhz synchronous ste p-down converter AME5250 rev . b.04 n chara cterization curve (contd.) load step v in = 3.6v v out = 1.8v i out = 100ma~1a~100ma 1) v out = 100mv/div 2) i out = 500ma/div load step v in = 3.6v v out = 1.8v i out = 200ma~1a~200ma 1) v out = 100mv/div 2) i out = 500ma/div load step v in = 3.6v v out = 1.8v i out = 50ma~1a~50ma 1) v out = 100mv/div 2) i out = 500ma/div power on from en v out = 1.2v i out = 1a 1) en = 2v/div 2) v out = 500mv/div 3) i l = 1a/div 40 m s/div 40 m s/div 40 m s/div 400 m s/div
ame 17 AME5250 rev .b.04 1a, 1.5mhz synchronous ste p-down converter df n-6d (2mmx2mmx0.75mm) n t a pe a nd reel di men sion p a c k a g e c a r r i e r w i d t h ( w ) p i t c h ( p ) p a r t p e r f u l l r e e l r e e l s i z e d f n - 6 d ( 2 x 2 x 0 . 7 5 m m ) 8 . 0 0 . 1 m m 4 . 0 0 . 1 m m 3 0 0 0 p c s 1 8 0 1 m m carrier t a pe, number of components per reel a nd reel size w p p i n 1 a m e a m e n date code rule 1 : j a n u a r y 7 : j u l y 2 : f e b r u a r y 8 : a u g u s t 3 : m a r c h 9 : s e p t e m b e r 4 : a p r i l a : o c t o b e r 5 : m a y b : n o v e m b e r 6 : j u n e c : d e c e m b e r m o n t h c o d e y e a r a a a m x x x x x 0 a a a m x x x x x 1 a a a m x x x x x 2 a a a m x x x x x 3 a a a m x x x x x 4 a a a m x x x x x 5 a a a m x x x x x 6 a a a m x x x x x 7 a a a m x x x x x 8 a a a m x x x x x 9 m a r k i n g
ame 18 1a, 1.5mhz synchronous ste p-down converter AME5250 rev . b.04 n t a pe a nd reel di men sion w p p i n 1 a m e a m e carrier t a pe, number of components per reel a nd reel size qf n-16c (3mmx3mmx0.75mm) p a c k a g e c a r r i e r w i d t h ( w ) p i t c h ( p ) p a r t p e r f u l l r e e l r e e l s i z e q f n - 1 6 c ( 3 x 3 x 0 . 7 5 m m ) 1 2 . 0 0 . 1 m m 4 . 0 0 . 1 m m 3 0 0 0 p c s 3 3 0 1 m m
ame 19 AME5250 rev .b.04 1a, 1.5mhz synchronous ste p-down converter n pa ck age di men sion df n-6d (2mmx2mmx0.75mm) m i n m a x m i n m a x a 0 . 7 0 0 0 . 8 0 0 0 . 0 2 8 0 . 0 3 1 d 1 . 9 0 0 2 . 1 0 0 0 . 0 7 5 0 . 0 8 3 e 1 . 9 0 0 2 . 1 0 0 0 . 0 7 5 0 . 0 8 3 e d 1 1 . 1 0 0 1 . 6 5 0 0 . 0 4 3 0 . 0 6 5 e 1 0 . 6 0 0 1 . 0 5 0 0 . 0 2 4 0 . 0 4 1 b 0 . 1 8 0 0 . 3 5 0 0 . 0 0 7 0 . 0 1 4 l 0 . 2 0 0 0 . 4 5 0 0 . 0 0 8 0 . 0 1 8 g 0 . 1 7 8 0 . 2 2 8 0 . 0 0 7 0 . 0 0 9 g 1 0 . 0 0 0 0 . 0 5 0 0 . 0 0 0 0 . 0 0 2 s y m b o l s m i l l i m e t e r s i n c h e s 0 . 6 5 0 t y p 0 . 0 2 6 t y p t o p v i e w b o t t o m v i e w r e a r v i e w e d e a g g 1 b l e 1 d 1 p i n 1 i d e n t i f i c a t i o n
ame 20 1a, 1.5mhz synchronous ste p-down converter AME5250 rev . b.04 n pa ck age di men sion qf n-16c (3mmx3mmx0.75mm) t o p v i e w b o t t o m v i e w r e a l v i e w d 1 e 1 p i n 1 i d e n t i f i c a t i o n k l e b a e d a 1 a 3 m i n m a x m i n m a x a 0 . 7 0 0 0 . 8 0 0 0 . 0 2 8 0 . 0 3 1 a 1 0 . 0 0 0 0 . 0 5 0 0 . 0 0 0 0 . 0 0 2 a 3 d 2 . 9 2 4 3 . 0 7 6 0 . 1 1 5 0 . 1 2 1 e 2 . 9 2 4 3 . 0 7 6 0 . 1 1 5 0 . 1 2 1 d 1 1 . 6 0 0 1 . 8 0 0 0 . 0 6 3 0 . 0 7 1 e 1 1 . 6 0 0 1 . 8 0 0 0 . 0 6 3 0 . 0 7 1 k b 0 . 1 8 0 0 . 2 8 0 0 . 0 0 7 0 . 0 1 1 e l 0 . 3 2 4 0 . 4 7 6 0 . 0 1 3 0 . 0 1 9 0 . 5 0 0 t y p . 0 . 0 2 0 t y p . s y m b o l s m i l l i m e t e r s i n c h e s 0 . 2 0 3 r e f . 0 . 0 0 8 r e f . 0 . 2 0 0 m i n . 0 . 0 0 8 m i n .
life support policy: the se products of ame, inc. are not authorized f or use a s critical components in life-support device s or syste ms, without the expre ss written a pproval of the pre sident of ame, inc. ame, inc. re serve s the right to ma ke cha nge s in the circuitry a nd spe cif ication s of its device s a nd a dvise s its customers to obtain the late st version of releva nt inf ormation. ? ame, inc. , ja nuary 2014 document: 1283-ds5250-b.04 corporate he a dquarter ame, inc.2f , 302 rui-gua ng roa d, ne i-hu district t ai pe i 1 14, t aiwa n. t el: 886 2 2627-8687 fax: 886 2 2659-2989 www .a me.com.tw e-m ail: sale s@a me.com.tw

▲Up To Search▲

Price & Availability of AME5250

	To Download AME5250 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .