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c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 5 - s e p . , 2 0 1 1 a p w 7 0 8 3 w w w . a n p e c . c o m . t w 1 a n p e c r e s e r v e s t h e r i g h t t o m a k e c h a n g e s t o i m p r o v e r e l i a b i l i t y o r m a n u f a c t u r a b i l i t y w i t h o u t n o t i c e , a n d a d v i s e c u s t o m e r s t o o b t a i n t h e l a t e s t v e r s i o n o f r e l e v a n t i n f o r m a t i o n t o v e r i f y b e f o r e p l a c i n g o r d e r s . 5 a , 2 6 v , 3 8 0 k h z , s y n c h r o n o u s s t e p - d o w n c o n v e r t e r f e a t u r e s w i d e i n p u t v o l t a g e f r o m 4 . 5 v t o 2 6 v o u t p u t c u r r e n t u p t o 5 a a d j u s t a b l e o u t p u t v o l t a g e f r o m 0 . 8 v t o 9 0 % v i n - 0 . 8 v r e f e r e n c e v o l t a g e - 2 . 5 % s y s t e m a c c u r a c y i n t e g r a t e d 5 0 m w p - c h a n n e l p o w e r m o s f e t a n d 2 0 m w n - c h a n n e l p o w e r m o s f e t h i g h e f f i c i e n c y u p t o 9 5 % c u r r e n t - m o d e o p e r a t i o n - s t a b l e w i t h c e r a m i c o u t p u t c a p a c i t o r s - f a s t t r a n s i e n t r e s p o n s e p o w e r - o n - r e s e t m o n i t o r i n g f i x e d 3 8 0 k h z s w i t c h i n g f r e q u e n c y i n p w m m o d e automatic pulse-skipping mode (psm)/pwm mode operation b u i l t - i n d i g i t a l s o f t - s t a r t o u t p u t c u r r e n t - l i m i t p r o t e c t i o n w i t h f r e q u e n c y f o l d b a c k 7 0 % u n d e r - v o l t a g e p r o t e c t i o n o v e r - t e m p e r a t u r e p r o t e c t i o n 1 1 8 % o v e r - v o l t a g e p r o t e c t i o n < 5 m a q u i e s c e n t c u r r e n t d u r i n g s h u t d o w n t h e r m a l - e n h a n c e d t q f n 5 x 6 - 2 8 p a c k a g e pb-free available as an option lead free and green devices available (rohs compliant) a p p l i c a t i o n s g e n e r a l d e s c r i p t i o n t h e a p w 7 0 8 3 i s a 5 a , s y n c h r o n o u s , s t e p - d o w n c o n v e r t e r w i t h i n t e g r a t e d 5 0 m w p - c h a n n e l p o w e r m o s f e t a n d 2 0 m w n - c h a n n e l p o w e r m o s f e t . t h e d e v i c e , w i t h c u r - r e n t - m o d e c o n t r o l s c h e m e , c a n c o n v e r t 4 . 5 ~ 2 6 v i n p u t v o l t - a g e t o t h e o u t p u t v o l t a g e a d j u s t a b l e f r o m 0 . 8 t o 9 0 % v i n t o p r o v i d e e x c e l l e n t o u t p u t v o l t a g e r e g u l a t i o n . t h e a p w 7 0 8 3 r e g u l a t e s t h e o u t p u t v o l t a g e i n a n a u t o - m a t i c p s m / p w m m o d e o p e r a t i o n , d e p e n d i n g o n t h e o u t - p u t c u r r e n t , f o r h i g h e f f i c i e n c y o p e r a t i o n o v e r l i g h t t o f u l l l o a d c u r r e n t . t h e a p w 7 0 8 3 i s a l s o e q u i p p e d w i t h p o w e r - o n - r e s e t , s o f t - s t a r t , a n d w h o l e p r o t e c t i o n s ( i n c l u d i n g o v e r - v o l t a g e , u n d e r - v o l t a g e , o v e r - t e m p e r a t u r e , a n d c u r r e n t - l i m i t ) i n a s i n g l e p a c k a g e . i n s h u t d o w n m o d e , t h e s u p p l y c u r r e n t d r o p s b e l o w 5 m a . t h i s d e v i c e , a v a i l a b l e i n 2 8 - p i n t q f n 5 x 6 p a c k a g e , p r o - v i d e s a v e r y c o m p a c t s y s t e m s o l u t i o n w i t h m i n i m a l e x t e r - n a l c o m p o n e n t s a n d g o o d t h e r m a l c o n d u c t a n c e . lcd monitor / tv settop box portable dvd wireless lan adsl, switch hub notebook computer step-down converters requiring high e f f i c i e n c y a n d 5 a o u t p u t c u r r e n t s i m p l i f i e d a p p l i c a t i o n c i r c u i t r2 1% lx en vin gnd comp u1 apw7083 fb ugnd v out 0.8v~90%v in , 5a l1 5a vcc c3 1 m f c2 1 m f v in 4.5v~26v c1 10 m f c5 r4 c6 c4 22 m f r1 1% v in c7 (optional) r5 100k w zcs pgnd
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 5 - s e p . , 2 0 1 1 a p w 7 0 8 3 w w w . a n p e c . c o m . t w 2 o r d e r i n g a n d m a r k i n g i n f o r m a t i o n n o t e : a n p e c l e a d - f r e e p r o d u c t s c o n t a i n m o l d i n g c o m p o u n d s / d i e a t t a c h m a t e r i a l s a n d 1 0 0 % m a t t e t i n p l a t e t e r m i n a t i o n f i n i s h ; w h i c h a r e f u l l y c o m p l i a n t w i t h r o h s . a n p e c l e a d - f r e e p r o d u c t s m e e t o r e x c e e d t h e l e a d - f r e e r e q u i r e m e n t s o f i p c / j e d e c j - s t d - 0 2 0 d f o r m s l c l a s s i f i c a t i o n a t l e a d - f r e e p e a k r e f l o w t e m p e r a t u r e . a n p e c d e f i n e s ? g r e e n ? t o m e a n l e a d - f r e e ( r o h s c o m p l i a n t ) a n d h a l o g e n f r e e ( b r o r c l d o e s n o t e x c e e d 9 0 0 p p m b y w e i g h t i n h o m o g e n e o u s m a t e r i a l a n d t o t a l o f b r a n d c l d o e s n o t e x c e e d 1 5 0 0 p p m b y w e i g h t ) . p i n c o n f i g u r a t i o n apw7083 handling code temperature range package code package code qb : tqfn5x6-28 operating ambient temperature range i : -40 to 85 o c h andling code tr : tape & reel assembly material g : h a l o g e n a n d l e a d f r e e d e v i c e assembly material apw7083 qb : apw7083 xxxxx xxxxx - date code comp 2 pgnd 4 zcs 3 pgnd 5 fb 1 pgnd 7 pgnd 6 lx 8 l x 1 1 l x 1 0 l x 1 2 l x 1 3 l x 9 l x 1 4 19 lx 18 lx 16 lx 17 lx 15 lx 21 vin 22 pgnd 20 lx 2 7 v c c 2 6 u g n d 2 5 e n 2 3 v i n 2 4 v i n 2 8 g n d = thermal pad (connected to copper plane for better heat dissipation) tqfn5x6-28 (top view) lx pgnd lx
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 5 - s e p . , 2 0 1 1 a p w 7 0 8 3 w w w . a n p e c . c o m . t w 3 symbol parameter rating unit v in vin supply voltage (vin to gnd) - 0.3 ~ 30 v > 100n s - 1 ~ v in + 0.3 v lx v zcs lx to gnd voltage zcs to gnd voltage < 100n s - 5 ~ v in + 6 v v in > 6.2v - 0.3 ~ 6.5 v cc vcc supply voltage (vcc to gnd) v in 6.2v v in + 0.3 v v ugnd_gnd ugnd to gnd voltage - 0.3 ~ v in +0.3 v v vin_ugnd vin to ugnd voltage - 0.3 ~ 6.5v v en to gnd voltage 20 v fb, comp to gnd voltage - 0.3 ~ v cc +0.3 v maximum junction temperature 150 o c t stg storage temperature - 65 ~ 150 o c t sdr maximum lead soldering temperature, 10 seconds 260 o c a b s o l u t e m a x i m u m r a t i n g s ( n o t e 1 ) t h e r m a l c h a r a c t e r i s t i c s symbol parameter typical value unit q ja junction - to - ambient resistance in f ree a ir (note 2) tqfn5x6 - 28 75 o c/w n o t e 2 : q j a i s m e a s u r e d w i t h t h e c o m p o n e n t m o u n t e d o n a h i g h e f f e c t i v e t h e r m a l c o n d u c t i v i t y t e s t b o a r d i n f r e e a i r . n o t e 1 : a b s o l u t e m a x i m u m r a t i n g s a r e t h o s e v a l u e s b e y o n d w h i c h t h e l i f e o f a d e v i c e m a y b e i m p a i r e d . e x p o s u r e t o a b s o l u t e m a x i m u m r a t i n g c o n d i t i o n s f o r e x t e n d e d p e r i o d s m a y a f f e c t d e v i c e r e l i a b i l i t y . r e c o m m e n d e d o p e r a t i n g c o n d i t i o n s ( n o t e 3 ) symbol parameter range unit v in vin supply voltage 4.5 ~ 26 v vcc supply voltage 4.0 ~ 5.5 v v out converter output voltage 0.8 ~ 90% v in v i out converter output current 0 ~ 5 a vcc input capacitor 0.22 ~ 2.2 m f vin - to - ugnd input capacitor 0. 22 ~ 2.2 m f t a ambient temperature - 40 ~ 85 o c t j junction temperature - 40 ~ 125 o c n o t e 3 : r e f e r t o t h e t y p i c a l a p p l i c a t i o n c i r c u i t s .
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 5 - s e p . , 2 0 1 1 a p w 7 0 8 3 w w w . a n p e c . c o m . t w 4 e l e c t r i c a l c h a r a c t e r i s t i c s apw70 83 symbol parameter test conditions min . typ . max . unit supply current i vin vin supply current v fb = 0.85v, v en = 3v, lx = open - 1.0 2.0 ma i vin_sd vin shutdown supply current v en = 0v , v in = 26v - - 5 m a i vcc vcc supply current v en = 3v, v cc = 5.0v - 0.7 - ma i vcc_sd vcc shutdown supply current v en = 0v, v cc = 5.0v - - 1 m a vcc 4.2v linear regulator output voltage v in = 5.2 ~ 26 v, i o = 0 ~ 8ma 4.0 4.2 4.5 v load regulation i o = 0 ~ 8ma - 6 0 - 40 0 mv current - limit v cc > p or threshold 8 - 3 0 ma vin - to - ugnd 5.5v linear regulator output voltage (v vin - ugnd ) v in = 6.2 ~ 26 v, i o = 0 ~ 10ma 5.3 5.5 5.7 v load regulation i o = 0 ~ 10ma - 8 0 - 60 0 mv current - limit v in = 6.2 ~ 26 v 10 - 30 ma power - on - reset (por) and lock out voltage thresholds vcc por voltage threshold v cc r ising 3.7 3.9 4.1 v vcc por hysteresis - 0.15 - v en lockout voltage threshold v en r ising 2.4 2.5 2.6 v en lockout hysteresis - 0.2 - v vin - to - ugnd lockout voltage threshold v vin - ug nd r ising - 3.5 - v vin - to - ugnd lockout hysteresis - 0.2 - v reference voltage v ref reference voltage - 0.8 - v t j = 25 o c, i out = 0a, v in = 12v - 1 - +1 output voltage accuracy t j = - 40 ~ 125 o c, i out = 0 ~ 3 a, v in = 4.5 ~ 26 v - 2. 5 - +2. 5 % line regulation v in = 4.5v to 26 v, i out = 0a - 0. 1 - % i out < 1 a - - 0.3 - l oad reg ulation i out = 1 ~ 5 a - - 0.53 - % /a oscillator and duty f osc oscillator running frequency v in = 4.5 ~ 26 v 340 380 420 khz foldback frequency v fb = 0v - 80 - khz maximum converter?s duty cycle - 93 - % minimum pulse width of lx v in = 4.5 ~ 26 v - 200 - ns current - mode pwm converter gm error amplifier transconductance - 4 00 - m a/v error amplifier dc gain comp = open 60 80 - db r e f e r t o t h e t y p i c a l a p p l i c a t i o n c i r c u i t s . t h e s e s p e c i f i c a t i o n s a p p l y o v e r v i n = 1 2 v , v o u t = 3 . 3 v a n d t a = - 4 0 ~ 8 5 o c , u n l e s s o t h e r w i s e s p e c i f i e d . v c c i s r e g u l a t e d b y a n i n t e r n a l r e g u l a t o r . t y p i c a l v a l u e s a r e a t t a = 2 5 o c .
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 5 - s e p . , 2 0 1 1 a p w 7 0 8 3 w w w . a n p e c . c o m . t w 5 e l e c t r i c a l c h a r a c t e r i s t i c s ( c o n t . ) apw70 83 symbol parameter test conditions min . typ . max . unit current - mode pwm converter (cont.) current - sense resistance - 0. 12 - w high - side switch r esistance between vin and exposed pad, t j = 25 o c - 50 80 m w low - side switch resistance be tween gnd and exposed pad, t j = 25 o c - 20 30 m w protections i lim p - channel power mosfet current - l imit peak current 6 8 10 a v uv fb under - v oltage threshold v fb f alling 66 70 74 % fb under - v oltage hysteresis - 40 - mv fb under - v oltage debounc e - 2 - m s v ov fb over - v oltage threshold v fb rising 114 118 122 % fb over - v oltage hysteresis - 40 - mv t otp over - t empe r ature trip point - 150 - o c over - t empe r ature hysteresis - 5 0 - o c t d dead - time v lx = - 0.7v, v in = 4.5 ~ 26v - 30 - n s soft - start, enable , and input currents t ss soft - start interval - 8 - ms preceding delay before soft - s tart - 11 - ms en logic low voltage v en falling , v i n = 4.5 ~ 26v - - 0.5 v en logic high voltage v en rising, v i n = 4.5 ~ 26v 2.1 - - v en pin clamped voltage i en = 10ma 12 - 17 v p - channel power mosfet leakage current v en = 0v, v lx = 0v, v in = 26v - - 4 m a i fb fb pin input current v fb = 0.8v - 100 - +100 m a i en en pin input current v en < 3v - 500 - +500 m a r e f e r t o t h e t y p i c a l a p p l i c a t i o n c i r c u i t s . t h e s e s p e c i f i c a t i o n s a p p l y o v e r v i n = 1 2 v , v o u t = 3 . 3 v a n d t a = - 4 0 ~ 8 5 o c , u n l e s s o t h e r w i s e s p e c i f i e d . v c c i s r e g u l a t e d b y a n i n t e r n a l r e g u l a t o r . t y p i c a l v a l u e s a r e a t t a = 2 5 o c .
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 5 - s e p . , 2 0 1 1 a p w 7 0 8 3 w w w . a n p e c . c o m . t w 6 t y p i c a l o p e r a t i n g c h a r a c t e r i s t i c s reference voltage, v ref (v) j u n c t i o n t e m p e r a t u r e , t j ( o c ) r e f e r e n c e v o l t a g e v s . j u n c t i o n t e m p e r a t u r e oscillator frequency, f osc (khz) j u n c t i o n t e m p e r a t u r e , t j ( o c ) o s c i l l a t o r f r e q u e n c y v s . j u n c t i o n t e m p e r a t u r e output voltage, v out (v) s u p p l y v o l t a g e , v i n ( v ) o u t p u t v o l t a g e v s . s u p p l y v o l t a g e output voltage, v out (v) o u t p u t c u r r e n t , i o u t ( a ) o u t p u t v o l t a g e v s . o u t p u t c u r r e n t current-limit level, i lim (a) j u n c t i o n t e m p e r a t u r e , t j ( o c ) c u r r e n t - l i m i t l e v e l ( p e a k c u r r e n t ) v s . j u n c t i o n t e m p e r a t u r e vin input current, i vin (ma) v i n s u p p l y v o l t a g e , v i n ( v ) v i n i n p u t c u r r e n t v s . s u p p l y v o l t a g e 0 1 2 3 4 v in =12v, v out =3.3v 3.26 3.27 3.28 3.29 3.30 3.31 3.32 3.33 3.34 5 0.784 0.788 0.792 0.796 0.800 0.804 0.808 0.812 0.816 -50 -25 0 25 50 75 100 125 150 -50 -25 0 25 50 75 100 125 150 340 350 360 370 380 390 400 410 420 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 0 2 4 6 8 10 12 14 16 18 20 22 v fb =0.85v 3.24 3.25 3.26 3.27 3.28 3.29 3.30 3.31 3.32 3.33 3.34 3.35 3.36 4 6 8 10 12 14 16 18 20 22 i out =0.2a i out =1a i out =2a i out =3a -50 -25 0 25 50 75 100 125 150 6.0 6.5 7.0 7.5 8.0 8.5 9.0
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 5 - s e p . , 2 0 1 1 a p w 7 0 8 3 w w w . a n p e c . c o m . t w 7 t y p i c a l o p e r a t i n g c h a r a c t e r i s t i c s ( c o n t . ) efficiency (%) o u t p u t c u r r e n t , i o u t ( a ) e f f i c i e n c y v s . o u t p u t c u r r e n t en clamp voltage, v en (v) e n i n p u t c u r r e n t , i e n ( m a ) e n c l a m p v o l t a g e v s . e n i n p u t c u r r e n t 30 40 60 70 80 90 100 10 0 0.001 0.01 0.1 1 10 50 20 v out =5v v out =3.3v v in =12v, l1=3.3 mh, c 4 =66 m f, c 1 =10 m f 0 2 4 6 8 10 12 14 16 18 1 10 100 1000 10000 t j =-30 c t j =25 c t j =100 c
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 5 - s e p . , 2 0 1 1 a p w 7 0 8 3 w w w . a n p e c . c o m . t w 8 o p e r a t i n g w a v e f o r m s r e f e r t o t h e ? t y p i c a l a p p l i c a t i o n c i r c u i t ? . t h e t e s t c o n d i t i o n s a r e v i n = 1 2 v , v o u t = 3 . 3 v , l 1 = 3 . 3 m h , c 4 = 6 6 m f , t a = 2 5 o c u n l e s s o t h e r w i s e s p e c i f i e d . l o a d t r a n s i e n t r e s p o n s e l o a d t r a n s i e n t r e s p o n s e c h 1 : v o u t , 2 0 0 m v / d i v , o f f s e t = 3 . 3 v c h 2 : i l 1 , 2 a / d i v , d c t i m e : 1 0 0 m s / d i v c h 1 : v o u t , 2 0 0 m v / d i v , o f f s e t = 3 . 3 v c h 2 : i l 1 , 2 a / d i v , d c t i m e : 1 0 0 m s / d i v p o w e r o n p o w e r o f f c h 1 : v i n , 5 v / d i v , d c c h 2 : v o u t , 2 v / d i v , d c c h 3 : i l 1 , 5 a / d i v , d c t i m e : 5 m s / d i v c h 1 : v i n , 5 v / d i v , d c c h 2 : v o u t , 2 v / d i v , d c c h 3 : i l 1 , 5 a / d i v , d c t i m e : 5 m s / d i v 1 2 i l1 v out i out =50ma-5a-50ma, rise/fall time=10 m s 1 2 i l1 v out i out =1a-5a-1a, rise/fall time=10 m s v out v in i l1 2 1 3 i out =5a v out v in i l1 2 1 3 i out =5a
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 5 - s e p . , 2 0 1 1 a p w 7 0 8 3 w w w . a n p e c . c o m . t w 9 o p e r a t i n g w a v e f o r m s ( c o n t . ) e n a b l e t h r o u g h e n p i n s h u t d o w n t h r o u g h e n p i n c h 1 : v e n , 5 v / d i v , d c c h 2 : v o u t , 2 v / d i v , d c c h 3 : i l 1 , 5 a / d i v , d c t i m e : 5 m s / d i v c h 1 : v e n , 5 v / d i v , d c c h 2 : v o u t , 2 v / d i v , d c c h 3 : i l 1 , 5 a / d i v , d c t i m e : 5 m s / d i v o v e r c u r r e n t s h o r t c i r c u i t c h 1 : v o u t , 1 v / d i v , d c c h 2 : i l 1 , 5 a / d i v , d c t i m e : 5 0 m s / d i v c h 1 : v o u t , 1 v / d i v , d c c h 2 : i l 1 , 5 a / d i v , d c t i m e : 5 0 m s / d i v 1 2 v out v en i out =5a i l1 3 1 2 v out v en i out =5a i l1 3 v out i l1 2 1 0.3 [ load is switched into v out while i out =1a v out v in i l1 2 1 i out =5a v out i l1 v out is shorted to ground by a wire r e f e r t o t h e ? t y p i c a l a p p l i c a t i o n c i r c u i t ? . t h e t e s t c o n d i t i o n s a r e v i n = 1 2 v , v o u t = 3 . 3 v , l 1 = 3 . 3 m h , c 4 = 6 6 m f , t a = 2 5 o c u n l e s s o t h e r w i s e s p e c i f i e d .
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 5 - s e p . , 2 0 1 1 a p w 7 0 8 3 w w w . a n p e c . c o m . t w 1 0 o p e r a t i n g w a v e f o r m s ( c o n t . ) s w i t c h i n g w a v e f o r m s w i t c h i n g w a v e f o r m c h 1 : v l x , 5 v / d i v , d c c h 2 : i l 1 , 2 a / d i v , d c t i m e : 1 m s / d i v c h 1 : v l x , 5 v / d i v , d c c h 2 : i l 1 , 2 a / d i v , d c t i m e : 1 m s / d i v l i n e t r a n s i e n t r e s p o n s e c h 1 : v i n , 1 0 v / d i v , d c c h 2 : v o u t , 1 0 0 m v / d i v , o f f s e t = 3 . 3 v t i m e : 1 0 0 m s / d i v 1 2 v lx i out =0.5a i l1 1 2 v lx i out =5a i l1 v out v in 2 1 v in =12 to 20v, rise/fall time=10 m s, i out =1a r e f e r t o t h e ? t y p i c a l a p p l i c a t i o n c i r c u i t ? . t h e t e s t c o n d i t i o n s a r e v i n = 1 2 v , v o u t = 3 . 3 v , l 1 = 3 . 3 m h , c 4 = 6 6 m f , t a = 2 5 o c u n l e s s o t h e r w i s e s p e c i f i e d .
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 5 - s e p . , 2 0 1 1 a p w 7 0 8 3 w w w . a n p e c . c o m . t w 1 1 p i n d e s c r i p t i o n pin no. name function 1 fb feedback input. the ic sense s feedback voltage via fb and regulate the voltage at 0.8v. connecting fb with a resistor - divider from the output set the output voltage in the range from 0.8v to 90% v in . 2 comp output of error am plifier. connect a series rc network from comp to gnd to compensate the regulation control loop. in some cases, an additional capacitor from comp to gnd is required for noise decoupling . 3 zcs zero - crossing sense pin. please externally connect this pin wi th lx. 4~7, 22 p gnd power ground pins. all these pins must be connected externally to the power ground plane. 8~20 lx power switching output. connect this pin to the underside exposed pad. 21, 23, 24 vin power input. vin supplies the power (4.5v to 26 v) to the control circuitry, gate driver and step - down converter switch. connecting a ceramic bypass capacitor and a suitably large capacitor between vin and gnd eliminates switching noise and voltage ripple on the input to the ic. 2 5 en enable input. en is a digital input that turns the regulator on or off. drive en high to turn on the regulator, drive it low to turn it off. pull up with 100k w resistor for automatic start - up. 26 ugnd gate driver power ground of the p - channel power mosfet. a linear regulato r regulates a 5.5v voltage between vin and ugnd to supply power to p - channel mosfet gate driver. connect a ceramic capacitor (1 m f typ.) between v in and u gnd for noise decoupling and stability of the linear regulator. 27 vcc bias input and 4.2v linear regu lator?s output. this pin supplies the bias to some control circuits. the 4.2v linear regulator converts the voltage on vin to 4.2v to supply the bias when no external 5v power supply is connected with vcc. connect a ceramic capacitor (1 m f typ.) between vcc and gnd for noise decoupling and stability of the linear regulator. 28 gnd signal ground. b l o c k d i a g r a m lx v ref 0.8v soft-start and fault logic error amplifier fb inhibit 70%v ref uvp pgnd por soft-start 4.2v regulator and power-on-reset v cc vcc v cc enable current sense amplifier en comp ovp 118%v ref oscillator 380khz slope compensation current compartor 0.8v ugnd vin over- temperature protection zero-crossing comparator current- limit v in fb 2.5v enok ug lg gate driver gate driver gm gate control linear regulator zcs gnd
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 5 - s e p . , 2 0 1 1 a p w 7 0 8 3 w w w . a n p e c . c o m . t w 1 2 t y p i c a l a p p l i c a t i o n c i r c u i t 4 . 5 ~ 2 6 v s i n g l e p o w e r i n p u t s t e p - d o w n c o n v e r t e r ( w i t h c e r a m i c i n p u t / o u t p u t c a p a c i t o r s ) v in (v) v out (v) l1 ( m h) c4 ( m f) c4 esr (m w ) r1 (k w ) r2 (k w ) c7 (pf) r4 (k w ) c5 (pf) c6 (pf) 12 5 3.3 66 3 63.4 12 68 24 1000 22 12 3.3 3.3 66 3 47 15 82 20 1500 22 12 1.2 3.3 66 3 7.5 15 270 12 2200 22 r e c o m m e n d e d f e e d b a c k c o m p e n s a t i o n n e t w o r k c o m p o n e n t s l i s t : r2 1% lx en vin gnd comp u1 apw7083 fb ugnd v out 0.8v~90%v in /5a l1 5a vcc c3 1 m f c2 1 m f v in 4.5~26v c1 10 m f c5 4700pf r4 3k w c6 22pf c4 22 m f r1 1% r5 100k w v in c7 (optional) zcs pgnd 1 4~7, 22 3 8~20 26 21, 23, 24 27 25 2 28
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 5 - s e p . , 2 0 1 1 a p w 7 0 8 3 w w w . a n p e c . c o m . t w 1 3 f u n c t i o n d e s c r i p t i o n m a i n c o n t r o l l o o p t h e a p w 7 0 8 3 i s a c o n s t a n t f r e q u e n c y c u r r e n t m o d e s w i t c h i n g r e g u l a t o r . d u r i n g n o r m a l o p e r a t i o n , t h e i n t e r - n a l p - c h a n n e l p o w e r m o s f e t i s t u r n e d o n e a c h c y c l e w h e n t h e o s c i l l a t o r s e t s a n i n t e r n a l r s l a t c h a n d w o u l d b e t u r n e d o f f w h e n a n i n t e r n a l c u r r e n t c o m p a r a t o r ( i c m p ) r e s e t s t h e l a t c h . t h e p e a k i n d u c t o r c u r r e n t a t w h i c h i c m p r e s e t s t h e r s l a t c h i s c o n t r o l l e d b y t h e v o l t a g e o n t h e c o m p p i n , w h i c h i s t h e o u t p u t o f t h e e r r o r a m p l i f i e r ( e a m p ) . a n e x t e r n a l r e s i s t i v e d i v i d e r c o n n e c t e d b e t w e e n v o u t a n d g r o u n d a l l o w s t h e e a m p t o r e c e i v e a n o u t p u t f e e d b a c k v o l t a g e v f b a t f b p i n . w h e n t h e l o a d c u r r e n t i n c r e a s e s , i t c a u s e s a s l i g h t d e c r e a s e i n v f b r e l a t i v e t o t h e 0 . 8 v r e f e r e n c e , w h i c h i n t u r n c a u s e s t h e c o m p v o l t - a g e t o i n c r e a s e u n t i l t h e a v e r a g e i n d u c t o r c u r r e n t m a t c h e s t h e n e w l o a d c u r r e n t . v c c p o w e r - o n - r e s e t ( p o r ) a n d e n u n d e r v o l t a g e l o c k o u t t h e a p w 7 0 8 3 k e e p s m o n i t o r i n g t h e v o l t a g e o n v c c p i n t o p r e v e n t w r o n g l o g i c o p e r a t i o n s w h i c h m a y o c c u r w h e n v c c v o l t a g e i s n o t h i g h e n o u g h f o r t h e i n t e r n a l c o n t r o l c i r c u i t r y t o o p e r a t e . t h e v c c p o r h a s a r i s i n g t h r e s h o l d o f 3 . 9 v ( t y p i c a l ) w i t h 0 . 1 5 v o f h y s t e r e s i s . a n e x t e r n a l u n d e r v o l t a g e l o c k o u t ( u v l o ) i s s e n s e d a n d p r o g r a m m e d a t t h e e n p i n . t h e e n u v l o h a s a r i s i n g t h r e s h o l d o f 2 . 5 v w i t h 0 . 2 v o f h y s t e r e s i s . t h e e n u v l o s h o u l d b e p r o g r a m m e d b y c o n n e c t i n g a r e s i s t i v e d i v i d e r f r o m v i n t o e n t o g n d . a f t e r t h e v c c , e n , a n d v i n - t o - u g n d v o l t a g e s e x c e e d t h e i r r e s p e c t i v e v o l t a g e t h r e s h o l d s , t h e i c s t a r t s a s t a r t - u p p r o - c e s s a n d t h e n r a m p s u p t h e o u t p u t v o l t a g e t o t h e s e t t i n g o f o u t p u t v o l t a g e . c o n n e c t i n g a r c n e t w o r k f r o m e n t o g n d i s f o r s e t t i n g a t u r n - o n d e l a y t h a t c a n b e u s e d t o s e q u e n c e t h e o u t p u t v o l t a g e s o f m u l t i p l e d e v i c e s . v c c 4 . 2 v l i n e a r r e g u l a t o r v c c i s t h e o u t p u t t e r m i n a l o f t h e i n t e r n a l 4 . 2 v l i n e a r r e g u - l a t o r w h i c h i s p o w e r e d f r o m v i n a n d p r o v i d e s p o w e r t o t h e a p w 7 0 8 3 . t h e l i n e a r r e g u l a t o r d e s i g n e d t o b e s t a b l e w i t h a l o w - e s r c e r a m i c o u t p u t c a p a c i t o r p o w e r s t h e i n - t e r n a l c o n t r o l c i r c u i t r y , t h e n b y p a s s e s v c c t o g n d w i t h a c e r a m i c c a p a c i t o r o f a t l e a s t 0 . 2 2 m f . i n o r d e r t o p r o v i d e g o o d n o i s e d e c o u p l i n g , p l e a s e p l a c e t h e c a p a c i t o r p h y s i - c a l l y c l o s e t o t h e i c . t h e l i n e a r r e g u l a t o r i s n o t i n t e n d e d f o r p o w e r i n g u p a n y e x t e r n a l l o a d s . d o n o t c o n n e c t a n y e x t e r n a l l o a d t o v c c . t h e l i n e a r r e g u l a t o r i s a l s o e q u i p p e d w i t h c u r r e n t - l i m i t p r o t e c t i o n t o p r o t e c t i t s e l f d u r i n g o v e r - l o a d o r s h o r t - c i r c u i t c o n d i t i o n s o n v c c p i n . v i n - t o - u g n d 5 . 5 v l i n e a r r e g u l a t o r t h e b u i l t - i n 5 . 5 v l i n e a r r e g u l a t o r r e g u l a t e s a 5 . 5 v v o l t a g e b e t w e e n v i n a n d u g n d p i n s t o s u p p l y b i a s a n d g a t e c h a r g e f o r t h e p - c h a n n e l p o w e r m o s f e t g a t e d r i v e r . t h e l i n e a r r e g u l a t o r i s d e s i g n e d t o b e s t a b l e w i t h a l o w - e s r c e r a m i c o u t p u t c a p a c i t o r o f a t l e a s t 0 . 2 2 m f . i t i s a l s o e q u i p p e d w i t h c u r r e n t - l i m i t f u n c t i o n t o p r o t e c t i t s e l f d u r - i n g o v e r - l o a d o r s h o r t - c i r c u i t c o n d i t i o n s b e t w e e n v i n a n d u g n d . t h e a p w 7 0 8 3 s h u t s o f f t h e o u t p u t o f t h e c o n v e r t e r s w h e n t h e o u t p u t v o l t a g e o f t h e l i n e a r r e g u l a t o r i s b e l o w 3 . 5 v ( t y p i c a l ) . t h e i c r e s u m e s w o r k i n g b y i n i t i a t i n g a n e w s o f t - s t a r t p r o c e s s w h e n t h e l i n e a r r e g u l a t o r ? s o u t p u t v o l t a g e i s a b o v e t h e u n d e r v o l t a g e l o c k o u t v o l t a g e t h r e s h o l d . d i g i t a l s o f t - s t a r t t h e a p w 7 0 8 3 h a s a b u i l t - i n d i g i t a l s o f t - s t a r t t o c o n t r o l t h e o u t p u t v o l t a g e r i s e a n d l i m i t t h e i n p u t c u r r e n t s u r g e d u r i n g s t a r t - u p . d u r i n g s o f t - s t a r t , a n i n t e r n a l r a m p , c o n - n e c t e d t o t h e o n e o f t h e p o s i t i v e i n p u t s o f t h e e r r o r a m p l i f i e r , r i s e s u p f r o m 0 v t o 1 v t o r e p l a c e t h e r e f e r e n c e v o l t a g e ( 0 . 8 v ) u n t i l t h e r a m p v o l t a g e r e a c h e s t h e r e f e r - e n c e v o l t a g e . t h e d e v i c e i s d e s i g n e d w i t h a p r e c e d i n g d e l a y a b o u t 1 0 . 8 m s ( t y p i c a l ) b e f o r e s o f t - s t a r t p r o c e s s . e n a b l e / s h u t d o w n d r i v i n g e n t o g r o u n d p l a c e s t h e a p w 7 0 8 3 i n s h u t d o w n . w h e n i n s h u t d o w n , t h e i n t e r n a l p o w e r m o s f e t t u r n s o f f , a l l i n t e r n a l c i r c u i t r y s h u t s d o w n a n d t h e q u i e s c e n t s u p p l y c u r r e n t o f v i n r e d u c e s t o < 1 m a ( t y p i c a l ) . o u t p u t u n d e r - v o l t a g e p r o t e c t i o n i n t h e p r o c e s s o f o p e r a t i o n , i f a s h o r t - c i r c u i t o c c u r s , t h e o u t p u t v o l t a g e w i l l d r o p q u i c k l y . b e f o r e t h e c u r r e n t - l i m i t c i r c u i t r e s p o n d s , t h e o u t p u t v o l t a g e w i l l f a l l o u t o f t h e r e -
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 5 - s e p . , 2 0 1 1 a p w 7 0 8 3 w w w . a n p e c . c o m . t w 1 4 f u n c t i o n d e s c r i p t i o n ( c o n t . ) o u t p u t u n d e r - v o l t a g e p r o t e c t i o n ( c o n t . ) q u i r e d r e g u l a t i o n r a n g e . t h e u n d e r - v o l t a g e c o n t i n u a l l y m o n i t o r s t h e f b v o l t a g e a f t e r s o f t - s t a r t i s c o m p l e t e d . i f a l o a d s t e p i s s t r o n g e n o u g h t o p u l l t h e o u t p u t v o l t a g e l o w e r t h a n t h e u n d e r - v o l t a g e t h r e s h o l d , t h e i c s h u t s d o w n c o n v e r t e r ? s o u t p u t . t h e u n d e r - v o l t a g e t h r e s h o l d i s 7 0 % o f t h e n o m i n a l o u t p u t v o l t a g e . t h e u n d e r - v o l t a g e c o m - p a r a t o r h a s a b u i l t - i n 2 m s n o i s e f i l t e r t o p r e v e n t t h e c h i p s f r o m w r o n g u v p s h u t d o w n c a u s e d b y n o i s e . t h e u n d e r - v o l t a g e p r o t e c t i o n w o r k s i n a h i c c u p m o d e w i t h o u t l a t c h e d s h u t d o w n . t h e i c w i l l i n i t i a t e a n e w s o f t - s t a r t p r o c e s s a t t h e e n d o f t h e p r o c e e d i n g d e l a y . o v e r - t e m p e r a t u r e p r o t e c t i o n ( o t p ) t h e o v e r - t e m p e r a t u r e c i r c u i t l i m i t s t h e j u n c t i o n t e m p e r a - t u r e o f t h e a p w 7 0 8 3 . w h e n t h e j u n c t i o n t e m p e r a t u r e e x - c e e d s t j = + 1 5 0 o c , a t h e r m a l s e n s o r t u r n s o f f t h e p o w e r m o s f e t , a l l o w i n g t h e d e v i c e s t o c o o l . t h e t h e r m a l s e n - s o r a l l o w s t h e c o n v e r t e r t o s t a r t a s t a r t - u p p r o c e s s a n d r e g u l a t e t h e o u t p u t v o l t a g e a g a i n a f t e r t h e j u n c t i o n t e m - p e r a t u r e c o o l s b y 5 0 o c . t h e o t p i s d e s i g n e d w i t h a 5 0 o c h y s t e r e s i s t o l o w e r t h e a v e r a g e t j d u r i n g c o n t i n u o u s t h e r - m a l o v e r l o a d c o n d i t i o n s , i n c r e a s i n g l i f e t i m e o f t h e i c . o v e r - v o l t a g e p r o t e c t i o n t h e o v e r - v o l t a g e f u n c t i o n m o n i t o r s t h e o u t p u t v o l t a g e b y f b p i n . t h e f b v o l t a g e s h o u l d i n c r e a s e o v e r 1 1 8 % o f t h e r e f e r e n c e v o l t a g e d u e t o t h e h i g h - s i d e m o s f e t f a i l u r e , o r f o r o t h e r r e a s o n s , t h e o v e r - v o l t a g e p r o t e c t i o n c o m p a r a t o r , w i l l f o r c e t h e l o w - s i d e m o s f e t g a t e d r i v e r h i g h . a s s o o n a s t h e o u t p u t v o l t a g e i s w i t h i n r e g u l a t i o n , t h e o v p c o m p a r a t o r i s d i s e n g a g e d . t h e c h i p s w i l l r e - s t o r e i t s n o r m a l o p e r a t i o n . t h i s o v p s c h e m e o n l y c l a m p s t h e v o l t a g e o v e r s h o o t , a n d d o e s n o t i n v e r t t h e o u t p u t v o l t - a g e w h e n o t h e r w i s e a c t i v a t e d w i t h a c o n t i n u o u s l y h i g h o u t p u t f r o m l o w - s i d e m o s f e t d r i v e r - a c o m m o n p r o b - l e m f o r o v p s c h e m e s w i t h a l a t c h . c u r r e n t - l i m i t p r o t e c t i o n t h e a p w 7 0 8 3 m o n i t o r s t h e o u t p u t c u r r e n t , f l o w i n g t h r o u g h t h e p - c h a n n e l p o w e r m o s f e t , a n d l i m i t s t h e c u r r e n t p e a k a t c u r r e n t - l i m i t l e v e l t o p r e v e n t l o a d s a n d t h e i c f r o m d a m - a g e s d u r i n g o v e r l o a d o r s h o r t - c i r c u i t c o n d i t i o n s . f r e q u e n c y f o l d b a c k w h e n t h e o u t p u t i s s h o r t e n e d t o t h e g r o u n d , t h e f r e q u e n c y o f t h e o s c i l l a t o r w i l l b e r e d u c e d t o a b o u t 8 0 k h z . t h i s l o w e r f r e q u e n c y a l l o w s t h e i n d u c t o r c u r r e n t t o s a f e l y d i s c h a r g e , t h e r e b y p r e v e n t i n g c u r r e n t r u n a w a y . t h e o s c i l l a t o r ? s f r e - q u e n c y w i l l g r a d u a l l y i n c r e a s e t o i t s d e s i g n e d r a t e w h e n t h e f e e d b a c k v o l t a g e o n f b a p p r o a c h e s 0 . 8 v a g a i n .
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 5 - s e p . , 2 0 1 1 a p w 7 0 8 3 w w w . a n p e c . c o m . t w 1 5 a p p l i c a t i o n i n f o r m a t i o n t h e r e g u l a t e d o u t p u t v o l t a g e i s d e t e r m i n e d b y : u s e s m a l l c e r a m i c c a p a c i t o r s f o r h i g h f r e q u e n c y d e c o u p l i n g a n d b u l k c a p a c i t o r s t o s u p p l y t h e s u r g e c u r - r e n t n e e d e d e a c h t i m e t h e p - c h a n n e l p o w e r m o s f e t ( q 1 ) t u r n s o n . p l a c e t h e s m a l l c e r a m i c c a p a c i t o r s p h y s i c a l l y c l o s e t o t h e v i n a n d b e t w e e n t h e v i n a n d g n d . t h e i m p o r t a n t p a r a m e t e r s f o r t h e b u l k i n p u t c a p a c i t o r a r e t h e v o l t a g e r a t i n g a n d t h e r m s c u r r e n t r a t i n g . f o r r e l i a b l e o p e r a t i o n , s e l e c t t h e b u l k c a p a c i t o r w i t h v o l t a g e a n d c u r - r e n t r a t i n g s a b o v e t h e m a x i m u m i n p u t v o l t a g e a n d l a r g - e s t r m s c u r r e n t r e q u i r e d b y t h e c i r c u i t . t h e c a p a c i t o r v o l t - a g e r a t i n g s h o u l d b e a t l e a s t 1 . 2 5 t i m e s g r e a t e r t h a n t h e m a x i m u m i n p u t v o l t a g e a n d a v o l t a g e r a t i n g o f 1 . 5 t i m e s i s a c o n s e r v a t i v e g u i d e l i n e . t h e r m s c u r r e n t ( i r m s ) o f t h e b u l k i n p u t c a p a c i t o r i s c a l c u l a t e d a s t h e f o l l o w i n g e q u a t i o n : w h e r e d i s t h e d u t y c y c l e o f t h e p o w e r m o s f e t . f o r a t h r o u g h h o l e d e s i g n , s e v e r a l e l e c t r o l y t i c c a p a c i t o r s m a y b e n e e d e d . f o r s u r f a c e m o u n t d e s i g n s , s o l i d t a n t a - l u m c a p a c i t o r s c a n b e u s e d , b u t c a u t i o n m u s t b e e x e r - c i s e d w i t h r e g a r d t o t h e c a p a c i t o r s u r g e c u r r e n t r a t i n g . f i g u r e 1 . c o n v e r t e r w a v e f o r m s a n o u t p u t c a p a c i t o r i s r e q u i r e d t o f i l t e r t h e o u t p u t a n d s u p - p l y t h e l o a d t r a n s i e n t c u r r e n t . t h e f i l t e r i n g r e q u i r e m e n t s a r e a f u n c t i o n o f t h e s w i t c h i n g f r e q u e n c y a n d t h e r i p p l e c u r r e n t ( d i ) . t h e o u t p u t r i p p l e i s t h e s u m o f t h e v o l t a g e s , h a v i n g p h a s e s h i f t , a c r o s s t h e e s r a n d t h e i d e a l o u t p u t c a p a c i t o r . t h e p e a k - t o - p e a k v o l t a g e o f t h e e s r i s c a l c u - l a t e d a s t h e f o l l o w i n g e q u a t i o n s : . . . . . . . . . . . ( 1 ) . . . . . . . . . . . ( 2 ) t h e p e a k - t o - p e a k v o l t a g e o f t h e i d e a l o u t p u t c a p a c i t o r i s c a l c u l a t e d a s t h e f o l l o w i n g e q u a t i o n s : v in v out c in c out l q1 lx esr i l i out i q1 i cout vin q2 i out v lx t=1/f osc i l i q1 i cout i out i i dt v out v out . . . . . . . . . . . ( 3 ) p o w e r s e q u e n c i n g t h e a p w 7 0 8 3 c a n o p e r a t e w i t h s i n g l e o r d u a l p o w e r i n p u t ( s ) . i n d u a l - p o w e r a p p l i c a t i o n , t h e v o l t a g e ( v c c ) a p p l i e d a t v c c p i n m u s t b e l o w e r t h a n t h e v o l t a g e ( v i n ) o n v i n p i n . t h e i n t e r n a l p a r a s i t i c d i o d e f r o m v c c t o v i n w i l l c o n d u c t d u e t o t h e f o r w a r d - v o l t a g e b e t w e e n v c c a n d v i n . t h e r e f o r e , v i n m u s t b e p r o v i d e d b e f o r e v c c . s e t t i n g o u t p u t v o l t a g e s u g g e s t e d r 2 i s i n t h e r a n g e f r o m 1 k t o 2 0 k w . f o r p o r - t a b l e a p p l i c a t i o n s , a 1 0 k r e s i s t o r i s s u g g e s t e d f o r r 2 . t o p r e v e n t s t r a y p i c k u p , p l e a s e l o c a t e r e s i s t o r s r 1 a n d r 2 c l o s e t o a p w 7 0 8 3 . i n p u t c a p a c i t o r s e l e c t i o n o u t p u t c a p a c i t o r s e l e c t i o n esr i v esr d = l f d) - (1 v i osc out = d v v d in out = (a) d) - (1 d i i out rms = (v) ) r2 r1 (1 0.8 v out + =
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 5 - s e p . , 2 0 1 1 a p w 7 0 8 3 w w w . a n p e c . c o m . t w 1 6 a p p l i c a t i o n i n f o r m a t i o n ( c o n t . ) o u t p u t c a p a c i t o r s e l e c t i o n ( c o n t . ) (v) c f 8 i v out osc cout d = d . . . . . . . . . . . ( 4 ) f o r t h e a p p l i c a t i o n s u s i n g b u l k c a p a c i t o r s , t h e d v c o u t i s m u c h s m a l l e r t h a n t h e v e s r a n d c a n b e i g n o r e d . t h e r e f o r e , t h e a c p e a k - t o - p e a k o u t p u t v o l t a g e ( d v o u t ) i s s h o w n a s b e l o w : (v) esr i v out d = d . . . . . . . . . . . ( 5 ) w h e r e v i n = v i n ( m a x ) f o r t h e a p p l i c a t i o n s u s i n g c e r a m i c c a p a c i t o r s , t h e v e s r i s m u c h s m a l l e r t h a n t h e d v c o u t a n d c a n b e i g n o r e d . t h e r e f o r e , t h e a c p e a k - t o - p e a k o u t p u t v o l t a g e ( d v o u t ) i s c l o s e t o d v c o u t . t h e l o a d t r a n s i e n t r e q u i r e m e n t i s a f u n c t i o n o f t h e s l e w r a t e ( d i / d t ) a n d t h e m a g n i t u d e o f t h e t r a n s i e n t l o a d c u r r e n t . t h e s e r e q u i r e m e n t s a r e g e n e r a l l y m e t w i t h a m i x o f c a - p a c i t o r s a n d c a r e f u l l a y o u t . h i g h f r e q u e n c y c a p a c i t o r s i n i - t i a l l y s u p p l y t h e t r a n s i e n t a n d s l o w t h e c u r r e n t l o a d r a t e s e e n b y t h e b u l k c a p a c i t o r s . t h e b u l k f i l t e r c a p a c i t o r v a l - u e s a r e g e n e r a l l y d e t e r m i n e d b y t h e e s r ( e f f e c t i v e s e - r i e s r e s i s t a n c e ) a n d v o l t a g e r a t i n g r e q u i r e m e n t s r a t h e r t h a n a c t u a l c a p a c i t a n c e r e q u i r e m e n t s . h i g h f r e q u e n c y d e c o u p l i n g c a p a c i t o r s s h o u l d b e p l a c e d a s c l o s e t o t h e p o w e r p i n s o f t h e l o a d a s p h y s i c a l l y p o s s i b l e . b e c a r e f u l n o t t o a d d i n d u c t a n c e i n t h e c i r c u i t b o a r d w i r i n g t h a t c o u l d c a n c e l t h e u s e f u l n e s s o f t h e s e l o w i n d u c t a n c e c o m p o n e n t s . a n a l u m i n u m e l e c t r o l y t i c c a p a c i t o r ? s e s r v a l u e i s r e l a t e d t o t h e c a s e s i z e w i t h l o w e r e s r a v a i l a b l e i n l a r g e r c a s e s i z e s . h o w e v e r , t h e e q u i v a - l e n t s e r i e s i n d u c t a n c e ( e s l ) o f t h e s e c a p a c i t o r s i n c r e a s e s w i t h c a s e s i z e a n d c a n r e d u c e t h e u s e f u l n e s s o f t h e c a - p a c i t o r t o h i g h s l e w - r a t e t r a n s i e n t l o a d i n g . i n d u c t o r v a l u e c a l c u l a t i o n . . . . . . . . . . . ( 6 ) t h e o p e r a t i n g f r e q u e n c y a n d i n d u c t o r s e l e c t i o n a r e i n t e r - r e l a t e d i n t h a t h i g h e r o p e r a t i n g f r e q u e n c i e s p e r m i t t h e u s e o f a s m a l l e r i n d u c t o r f o r t h e s a m e a m o u n t o f i n d u c t o r r i p p l e c u r r e n t . h o w e v e r , t h i s i s a t t h e e x p e n s e o f e f f i c i e n c y d u e t o a n i n c r e a s e i n m o s f e t g a t e c h a r g e l o s s e s . t h e e q u a t i o n ( 2 ) s h o w s t h a t t h e i n d u c t a n c e v a l u e h a s a d i r e c t e f f e c t o n r i p p l e c u r r e n t . a c c e p t i n g l a r g e r v a l u e s o f r i p p l e c u r r e n t a l l o w s t h e u s e o f l o w i n d u c t a n c e s , b u t r e s u l t s i n h i g h e r o u t p u t v o l t a g e r i p p l e a n d g r e a t e r c o r e l o s s e s . a r e a s o n a b l e s t a r t i n g p o i n t f o r s e t t i n g r i p p l e c u r r e n t i s d i 0 . 4 i o u t ( m a x ) . r e m e m b e r , t h e m a x i m u m r i p p l e c u r r e n t o c c u r s a t t h e m a x i m u m i n p u t v o l t a g e . t h e m i n i m u m i n d u c t a n c e o f t h e i n d u c t o r i s c a l - c u l a t e d b y u s i n g t h e f o l l o w i n g e q u a t i o n : 2 v l 380000 ) v - (v v in out in out (h) v 760000 ) v - (v v l in out in out 3 layout consideration i n h i g h p o w e r s w i t c h i n g r e g u l a t o r , a c o r r e c t l a y o u t i s i m - p o r t a n t t o e n s u r e p r o p e r o p e r a t i o n o f t h e r e g u l a t o r . i n g e n e r a l , i n t e r c o n n e c t i n g i m p e d a n c e s h o u l d b e m i n i m i z e d b y u s i n g s h o r t , w i d e p r i n t e d c i r c u i t t r a c e s . s i g n a l a n d p o w e r g r o u n d s a r e t o b e k e p t s e p a r a t i n g a n d f i n a l l y c o m - b i n e d u s i n g g r o u n d p l a n e c o n s t r u c t i o n o r s i n g l e p o i n t g r o u n d i n g . f i g u r e 2 i l l u s t r a t e s t h e l a y o u t , w i t h b o l d l i n e s i n d i c a t i n g h i g h c u r r e n t p a t h s . c o m p o n e n t s a l o n g t h e b o l d l i n e s s h o u l d b e p l a c e d c l o s e t o g e t h e r . t h e f o l l o w i n g i s a c h e c k l i s t f o r y o u r l a y o u t : 1 . f i r s t l y , t o i n i t i a l t h e l a y o u t b y p l a c i n g t h e p o w e r c o m p o n e n t s . o r i e n t t h e p o w e r c i r c u i t r y t o a c h i e v e a c l e a n p o w e r f l o w p a t h . i f p o s s i b l e , m a k e a l l t h e c o n n e c t i o n s o n o n e s i d e o f t h e p c b w i t h w i d e , c o p p e r f i l l e d a r e a s . 2 . i n f i g u r e 2 , t h e l o o p s w i t h t h e s a m e c o l o r b o l d l i n e s c o n d u c t h i g h s l e w r a t e c u r r e n t . t h e s e i n t e r c o n n e c t i n g i m p e d a n c e s s h o u l d b e m i n i m i z e d b y u s i n g w i d e , s h o r t p r i n t e d c i r c u i t t r a c e s . 3 . k e e p t h e s e n s i t i v e s m a l l s i g n a l n o d e s ( f b , c o m p ) a w a y f r o m s w i t c h i n g n o d e s ( l x o r o t h e r s ) o n t h e p c b . t h e r e f o r e , p l a c e t h e f e e d b a c k d i v i d e r a n d t h e f e e d b a c k c o m p e n s a t i o n n e t w o r k c l o s e t o t h e i c t o a v o i d s w i t c h i n g n o i s e . c o n n e c t t h e g r o u n d o f f e e d b a c k d i v i d e r d i r e c t l y t o t h e g n d p i n o f t h e i c u s i n g a d e d i c a t e d g r o u n d t r a c e . 4 . t h e v c c d e c o u p l i n g c a p a c i t o r s h o u l d b e r i g h t n e x t t o t h e v c c a n d g n d p i n s . c a p a c i t o r c 2 s h o u l d b e c o n n e c t e d a s c l o s e t o t h e v i n a n d u g n d p i n s a s p o s s i b l e . 5 . p l a c e t h e d e c o u p l i n g c e r a m i c c a p a c i t o r c 1 n e a r t h e v i n a s c l o s e a s p o s s i b l e . t h e b u l k c a p a c i t o r s c 8 a r e a l s o p l a c e d n e a r v i n . u s e a w i d e p o w e r g r o u n d p l a n e t o c o n - n e c t t h e c 1 , c 8 , a n d c 4 t o p r o v i d e a l o w i m p e d a n c e
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 5 - s e p . , 2 0 1 1 a p w 7 0 8 3 w w w . a n p e c . c o m . t w 1 7 a p p l i c a t i o n i n f o r m a t i o n ( c o n t . ) l a y o u t c o n s i d e r a t i o n ( c o n t . ) f i g u r e 2 . c u r r e n t p a t h d i a g r a m f i g u r e 3 . r e c o m m e n d e d l a y o u t d i a g r a m figure 4. recommended minimum footprint p a t h b e t w e e n t h e c o m p o n e n t s f o r l a r g e a n d h i g h s l e w r a t e c u r r e n t . v out lx en 25 vin gnd 28 vcc 27 8~20 apw7083 fb 1 r top pgnd r gnd l out c out l o a d c in + v in - feedbac k divider c top 21 + - 23 24 c 3 4~7,22 ugnd comp 26 2 c 3 r 4 c 6 c 2 zcs 3 grou nd comp 2 zcs 3 fb 1 pgnd 7 pgnd 6 l x 1 1 l x 1 0 l x 1 2 l x 1 3 l x 9 l x 1 4 19 lx 18 lx 16 lx 17 lx 15 lx 20 lx 2 7 v c c 2 6 u g n d 2 5 e n 2 3 v i n 2 4 v i n 2 8 g n d lx pgnd lx v out c in c out vin power ground for dissipating h eat l out lx 8 pgnd 4 pgnd 5 22 pgnd 21 vin lx pgnd lx 6 m m 5 mm 1 . 5 5 m m 2 . 7 6 m m 1 . 8 5 m m 3 . 57 mm 1 . 85 mm 1 . 38 mm 0 . 45 mm 0 . 34 mm 0 . 3 4 m m 0 . 265 mm * just recommend 0 . 225 mm 0 . 6 5 m m 0 . 45 mm *
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 5 - s e p . , 2 0 1 1 a p w 7 0 8 3 w w w . a n p e c . c o m . t w 1 8 p a c k a g e i n f o r m a t i o n t q f n 5 x 6 - 2 8 s y m b o l min. max. 0.80 0.00 0.25 0.35 1.80 1.90 0.05 1.33 a a1 b d d3 e e3 e l millimeters a3 0.20 ref tqfn5x6-28 0.35 0.45 1.43 0.008 ref min. max. inches 0.032 0.000 0.010 0.014 0.071 0.075 0.052 0.014 0.018 0.70 0.056 0.028 0.002 0.65 bsc 0.026 bsc 0.20 0.008 k 5.90 6.10 0.232 0.240 4.90 5.10 0.193 0.201 0.063 d2 1.50 1.60 0.059 0.111 2.71 d1 2.81 0.107 0.143 e2 3.52 3.62 0.139 0.075 1.80 e1 0.071 1.90 h 0.34 ref 0.013 ref d3 e e 3 h e 1 pin 1 corner l k e 2 d1 h d2 a3 a1 b a pin 1 e d
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 5 - s e p . , 2 0 1 1 a p w 7 0 8 3 w w w . a n p e c . c o m . t w 1 9 c a r r i e r t a p e & r e e l d i m e n s i o n s application a h t1 c d d w e1 f 330.0 ? 2.00 50 min. 12.4+2.00 - 0.00 13.0+0.50 - 0.20 1.5 min. 20.2 min. 12.0 ? 0.30 1.75 ? 0.10 5.5 ? 0.10 p 0 p1 p 2 d 0 d1 t a 0 b 0 k 0 tqfn5x6 - 28 4.0 ? 0.10 8.0 ? 0.10 2.0 ? 0.10 1.5+0.10 - 0.00 1.5 min. 0.3 ? 0.05 6.5 ? 0.10 5.3 ? 0.10 1.4 ? 0.10 (mm) package type unit quantity tqfn5x6 - 28 tape & reel 2500 d e v i c e s p e r u n i t a e 1 a b w f t p0 od0 b a0 p2 k0 b 0 section b-b section a-a od1 p1 h t1 a d
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 5 - s e p . , 2 0 1 1 a p w 7 0 8 3 w w w . a n p e c . c o m . t w 2 0 t a p i n g d i r e c t i o n i n f o r m a t i o n c l a s s i f i c a t i o n p r o f i l e t q f n 5 x 6 - 2 8 user direction of feed
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 5 - s e p . , 2 0 1 1 a p w 7 0 8 3 w w w . a n p e c . c o m . t w 2 1 c l a s s i f i c a t i o n r e f l o w p r o f i l e s profile feature sn - pb eutectic assembly pb - free assembly preheat & soak temperature min (t smin ) temperature max (t smax ) time (t smin to t smax ) ( t s ) 100 c 150 c 60 - 120 seconds 150 c 200 c 60 - 1 2 0 seconds average ramp - up rate (t smax to t p ) 3 c/second ma x. 3 c/second max. liquidous temperature ( t l ) time at l iquidous (t l ) 183 c 60 - 150 seconds 217 c 60 - 150 seconds peak package body temperature (t p ) * see classification temp in table 1 see classification temp in table 2 time (t p ) ** within 5 c of the spe cified c lassification t emperature ( t c ) 2 0 ** seconds 3 0 ** seconds average r amp - down rate (t p to t smax ) 6 c/second max. 6 c/second max. time 25 c to p eak t emperature 6 minutes max. 8 minutes max. * tolerance for peak profile temperature (t p ) is defined as a supplier minimum and a user maximum. ** tolerance for time at peak profile temperature (t p ) is defined as a supplier minimum and a user maximum. table 2. pb - free process ? classification temperatures (tc) package thickness volume mm 3 <350 volume mm 3 350 - 2000 volume mm 3 >2000 <1.6 mm 260 c 260 c 260 c 1.6 mm ? 2.5 mm 260 c 250 c 245 c 3 2.5 mm 250 c 245 c 245 c table 1. snpb eutectic process ? classification temperatures (tc) package thickness volume mm 3 <350 volume mm 3 3 350 <2.5 mm 235 c 22 0 c 3 2.5 mm 220 c 220 c test item method description solderability jesd - 22, b102 5 sec, 245 c holt jesd - 22, a108 1000 hrs, bias @ t j =125 c pct jesd - 22, a102 168 hrs, 100 % rh, 2atm , 121 c tct jesd - 22, a104 500 cycles, - 65 c~150 c hbm mil - std - 883 - 3015.7 vhbm ? 2kv mm jesd - 22, a1 15 vmm ? 200v latch - up jesd 78 10ms, 1 tr ? 100ma r e l i a b i l i t y t e s t p r o g r a m
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . a . 5 - s e p . , 2 0 1 1 a p w 7 0 8 3 w w w . a n p e c . c o m . t w 2 2 c u s t o m e r s e r v i c e a n p e c e l e c t r o n i c s c o r p . head office : no.6, dusing 1st road, sbip, hsin-chu, taiwan, r.o.c. tel : 886-3-5642000 fax : 886-3-5642050 t a i p e i b r a n c h : 2 f , n o . 1 1 , l a n e 2 1 8 , s e c 2 j h o n g s i n g r d . , s i n d i a n c i t y , t a i p e i c o u n t y 2 3 1 4 6 , t a i w a n t e l : 8 8 6 - 2 - 2 9 1 0 - 3 8 3 8 f a x : 8 8 6 - 2 - 2 9 1 7 - 3 8 3 8

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