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ame 1 AME5250A rev .a.03 1a, 1.5mhz synchronous ste p-down converter the AME5250A 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 . supply current with no loa d is 400 m a a nd drops to<1 m a in shutdown.the 2.5v to 5.5v in put v oltage ra nge ma ke s the AME5250A ide ally suited f or single li-ion battery- powered a pplication s. 100% duty cycle provide s low drop- out operation, extending battery life in portable systems.pwm pulse skipping mode operation provides very low output ri pple voltage f or noise sen sitive a pplication s. at very light loa d, the AME5250A will automatically s ki p pulses in pulse skip mode operation to maintain outputregulation. 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 AME5250A 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 a 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 high efficiency: up to 95% l shutdown mode draws <1 m a supply current 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 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 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 a 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 AME5250A rev . a.03 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 / 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 AME5250A rev .a.03 1a, 1.5mhz synchronous ste p-down converter AME5250A-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 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 AME5250A-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 6 5 4 1 2 3 a m e 5 2 5 0 a a m e 5 2 5 0 a 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 AME5250A rev . a.03 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 AME5250A - x x x xxx output v oltage
ame 5 AME5250A rev .a.03 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 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
ame 6 1a, 1.5mhz synchronous ste p-down converter AME5250A rev . a.03 n thermal information * me a sure q jc on ba ck side center of exposed pa d. ** mil-st d-202g 210f 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 AME5250A rev .a.03 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 i q 0 . 4 0 . 5 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 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 AME5250A rev . a.03 n detailed de scri ption main control loopthe AME5250A 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 in- tern 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 current 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 . pulse skipping mode operationat light loa ds, the inductor current may re a ch zero or reverse on e a ch pulse.the bottom mosfet is turned of f by the current reversal comparator , ircmp , a nd the switch voltage will ring. this is discontinuous mode operation,a nd is normal behavior f or the switching regulator . 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 toward the maximum on-time. further reduction of thesupply 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 inputvoltage minus the voltage drop a cross the p-cha nnel mosfet a nd the inductor . the ba sic AME5250A a pplication circuit is shown in t ypical application circuit. extern al component sele c- tion is determined by the maxi mum loa d current a nd be- gin 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 half the ripple current to prevent core saturation.for better ef f iciency , choose a low dc-re sista nce induc- tor . 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 prevent 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 com- monly used f or de sign be cause even signif ica nt devi a- tion 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 required. n application inf ormation ) 1 ( 1 i n o u t o u t l v v v l f i - = d 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
ame 9 AME5250A rev .a.03 1a, 1.5mhz synchronous ste p-down converter the selection of c out is determined by the effective serie s re sista nce(esr) that is required to mini mize volt- age 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 voltage 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 di- vider a ccording to the f ollowing equation: where v ref equals to 0.6v typical. the resistive di- vider allows the fb pin to sen se a fra ction of the output voltage a s shown in figure 4. + = 2 1 1 r r v v r e f o u t figure 4. setting the AME5250A output v oltage r 1 r 2 5 . 5 v v o u t 0 . 6 v a m e 5 2 5 0 a f b g n d thermal considerations in most a pplication s the AME5250A doe s not dissi- pate much he at due to its high ef f iciency . but, in a ppli- cation s where the AME5250A is running at high a mbient te mperature with low supply voltage a nd high duty cycle s, such a s in dropout, the he at dissi pated may exceed the maximum junction temperature of the part. if the junctionte mperature 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 mpeda nce. t o avoid the AME5250A from exceed- ing the maximum junction temperature, the user will needto do some thermal a n alysis. the goal of the thermal a n alysis is to determine whether the power dissi pated exceeds the maximum junction temperature of the part.the temperature 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. ) ) ( ( 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 AME5250A rev . a.03 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 a 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 1 5 0 k c f w d 2 . 2 m h a m e 5 2 5 0 a 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 a 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 2 . 2 m h a m e 5 2 5 0 a 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 a 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
ame 11 AME5250A rev .a.03 1a, 1.5mhz synchronous ste p-down converter pc b oard layout checklist when laying out the printed circuit board, the following checklist should be used to ensure proper operation of the AME5250A. 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 c in 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 a 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 c o u t i n a m e 5 2 5 0 a 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 figure 10. AME5250A adjusta ble v oltage regulator layout di agra m figure 1 1. AME5250A fixed v oltage regulator layout di agra m
ame 12 1a, 1.5mhz synchronous ste p-down converter AME5250A rev . a.03 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 AME5250A rev .a.03 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 efficiency vs. output current efficiency vs. output current output current (ma) efficiency (%) 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 0 1 0 0 1 1 0 1 0 0 1 0 0 0 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 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 0 1 0 0 1 1 0 1 0 0 1 0 0 0 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 output current (ma) efficiency (%) 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 0 1 0 0 1 1 0 1 0 0 1 0 0 0 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 output current (ma) efficiency (%) output current (ma) efficiency (%) 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 0 1 0 0 1 1 0 1 0 0 1 0 0 0 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 1 1 0 1 0 0 1 0 0 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 0 1 0 0 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 output current (ma) efficiency (%) 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 0 1 0 0 1 1 0 1 0 0 1 0 0 0 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 output current (ma) efficiency (%)
ame 14 1a, 1.5mhz synchronous ste p-down converter AME5250A rev . a.03 n chara cterization curve reference v oltage vs. t e mperature frequency vs. t e mperature frequency vs. supply v oltage output v oltage vs. output current current li mit vs. t e mperature current li mit vs. t e mperature 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 v i n = 3 . 6 v output current (ma) reference v oltage (v) 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 1 . 7 5 1 . 8 0 1 . 8 5 1 . 9 0 - 5 0 - 2 5 + 0 + 2 5 + 5 0 + 7 5 + 1 0 0 + 1 2 5 v i n = 3 . 6 v output current (ma) frequency (mhz) v in (v) frequency (mhz) 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 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 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 v i n = 3 . 6 v output current (ma) output v oltage (v) 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 = 3 . 3 v v o u t = 1 . 2 v t e mperature ( o c) current limit (a) 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 = 3 . 6 v v o u t = 1 . 2 v t e mperature ( o c) current limit (a)
ame 15 AME5250A rev .a.03 1a, 1.5mhz synchronous ste p-down converter n chara cterization curve light loa d mode output v oltage ri pple v in = 3.6v v out = 1.8v i out = 50ma 1) v sw = 2v/div 2) v out = 10mv/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 v in = 3.6v v out = 1.2v i out = 1a 1) v sw = 2v/div 2) v out = 10mv/div 3) i l = 500ma/div he avy loa d mode output v oltage ri pple 40 m s/div 400ns/div 400ns/div 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)
ame 16 1a, 1.5mhz synchronous ste p-down converter AME5250A rev . a.03 n chara cterization curve 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 power off from en v in = 3.6v v out = 1.8v i out = 1a 1) en = 2v/div 2) v out = 2v/ddiv 3) i l = 500ma/div 40 m s/div 40 m s/div 400 m s/div 50 m s/div
ame 17 AME5250A rev .a.03 1a, 1.5mhz synchronous ste p-down converter df n-6d (2mmx2mmx0.75mm) n t a pe a nd reel di men sion carrier t a pe, number of components per reel a nd reel size qf n-16c (3mmx3mmx0.75mm) 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 w p p i n 1 a m e a m e 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 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
ame 18 1a, 1.5mhz synchronous ste p-down converter AME5250A rev . a.03 n pa ck age di men sion df n-6d (2mmx2mmx0.75mm) 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 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
ame 19 AME5250A rev .a.03 1a, 1.5mhz synchronous ste p-down converter 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 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 . 0 . 5 0 0 t y p . 0 . 0 2 0 t y p . r e a l v i e w
ame 20 1a, 1.5mhz synchronous ste p-down converter AME5250A rev . a.03 n le a d pattern note:1. lead pattern unit description: bsc: ba sic. re pre sents theoretical exa ct di men sion or di men sion target. 2. di men sion s in m illi meters. 3. general tolera nce + 0.05mm unle ss otherwise spe cif ied. 1 . 2 0 0 b s c 0 . 6 0 0 b s c 1 . 3 0 0 b s c 0 . 6 5 0 b s c 0 . 3 5 0 b s c 0 . 8 0 0 b s c n 1 df n-6d (2mmx2mmx0.75mm)
ame 21 AME5250A rev .a.03 1a, 1.5mhz synchronous ste p-down converter 2 . 1 5 0 b s c 1 . 8 0 0 b s c 1 . 8 0 0 b s c n 1 0 . 6 2 5 b s c 0 . 5 0 0 b s c 0 . 3 3 0 b s c n le a d pattern note:1. lead pattern unit description: bsc: ba sic. re pre sents theoretical exa ct di men sion or di men sion target. 2. di men sion s in m illi meters. 3. general tolera nce + 0.05mm unle ss otherwise spe cif ied. qf n-16c (3mmx3mmx0.75mm)
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-ds5250a-a.03 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

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