View APW7077ZBI-TRG_3775626.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

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 . 7 - j u n . , 2 0 0 9 a p w 7 0 7 7 / a 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 . p w m s t e p - u p d c - d c c o n v e r t e r f e a t u r e s g e n e r a l d e s c r i p t i o n a p p l i c a t i o n s c e l l u l a r a n d p o r t a b l e p h o n e s p o r t a b l e a u d i o c a m c o r d e r s a n d d i g i t a l s t i l l c a m e r a h a n d - h e l d i n s t r u m e n t p d a s t h e a p w 7 0 7 7 / a s e r i e s a r e m u l t i - f u n c t i o n p w m s t e p - u p d c - d c c o n v e r t e r w i t h a n a d a p t i v e v o l t a g e m o d e c o n t r o l - l e r a n d h i g h e r e f f i c i e n c y a p p l i c a t i o n f r o m o n e t o f o u r c e l l s b a t t e r y p a c k s . t h e a p w 7 0 7 7 / a s e r i e s a r e s e t p w m o p e r - a t i n g m o d e , v o l t a g e - m o d e t o f o l l o w p o r t a b l e a p p l i c a t i o n . a n d b u i l t - i n d r i v e r p i n , e x t p i n , f o r c o n n e c t i n g t o a n e x t e r - n a l t r a n s i s t o r o r m o s f e t d u r i n g l i g h t l o a d , t h e d e v i c e w i l l a u t o m a t i c a l l y s k i p s w i t c h i n g c y c l e s t o m a i n t a i n h i g h e f f i c i e n c y . t h e a p w 7 0 7 7 / a s e r i e s c o n s i s t o f p w m c o n t r o l l e r , r e f e r e n c e v o l t a g e , p h a s e c o m p e n s a t i o n , o s c i l l a t o r , s o f t - s t a r t , d r i v e r b l o c k . i t w i l l b e p r o v i d e d t o o p - e r a t e s u i t a b l e v o l t a g e w i t h o u t e x t e r n a l c o m p e n s a t i o n c i r c u i t . t h e a p w 7 0 7 7 / a s e r i e s h a v e f i x e d v o l t a g e a n d a d - j u s t a b l e v o l t a g e v e r s i o n f r o m a w i d e i n p u t v o l t a g e r a n g e s 0 . 7 v t o 5 . 5 v f o r s t e p - u p d c - d c c o n v e r t e r . t h e s t a r t - u p i s g u a r a n t e e d a t 1 v a n d t h e d e v i c e i s o p e r a t i n g d o w n t o 0 . 7 v , a n d p r o v i d i n g u p t o 3 0 0 m a l o a d i n g c u r r e n t . b e s i d e s , l o w q u i e s c e n t c u r r e n t ( s w i t c h - o f f ) i s g u a r a n t e e d . low start-up voltage 0.9v fixed 300khz operating frequency built-in internal soft-start circuit low operating current 3.3v and 5v ( 2.5%) fixed (apw7077) or adjustable output voltage (apw7077a) high efficiency up to 88% at 400ma output current high output current up to 1a compact package: sot-23-5 l e a d f r e e a n d g r e e n d e v i c e s a v a i l a b l e ( r o h s c o m p l i a n t ) p i n c o n f i g u r a t i o n v out ce nc gnd ext 1 2 3 4 5 fb v dd ce gnd ext 1 2 3 4 5 sot-23-5 (top view) sot-23-5 (top view) apw7077 apw7077a
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 . 7 - j u n . , 2 0 0 9 a p w 7 0 7 7 / a 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 c 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 ) . symbol parameter rating unit v dd supply voltage - 0.3 to 7 v v io input / output pins (ce, fb, ext) - 0.3 to 7 v t a operating ambient temperature range - 40 to 85 c t j junction temperature range - 40 to 150 c t stg storage temperature range - 65 to +150 c t s maximum lead soldering temperature , 10 seconds 260 c symbol parameter typical value unit r q ja thermal resistance - junction to ambient (note 2) sot - 23 - 5 200 c/w t h e r m a l c h a r a c t e r i s t i c s 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 ) 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 . 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 . apw7077/a package code b : sot-23-5 temperature range i : -40 to 85 o c handling code tr : tape & reel voltage code r : 3.3v z : 5.0v assembly material g : halogen and lead free device handling code temperature range package code apw7077 33b : assembly material voltage code apw7077a b : a77x x - date code; r : 3.3v x - date code apw7077 50b : x - date code; z : 5.0v 77rx 77zx
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 . 7 - j u n . , 2 0 0 9 a p w 7 0 7 7 / a w w w . a n p e c . c o m . t w 3 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 apw7077a symbol parameter test condition s min . typ . max . unit s tep - up s ection v in minimum o perating i nput v oltage v out = v dd - 0.9 - v v dd operating v oltage v in = v dd 1.9 - 5.5 v start - up v oltage i o <10ma, v out = v dd (<5.5v) - 0.9 1 v v out = 12v, io<10ma, v dd = v in 1.9 2.0 - v f sw operating f requency v dd = 3.3v , v fb = 0.5v 270 300 330 khz oscillator f requency l ine r egulation 2.0v 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 . 7 - j u n . , 2 0 0 9 a p w 7 0 7 7 / a 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 ( c o n t . ) apw7077 symbol parameter test condition s min . typ . max . unit s tep - up s ection v in minimum o perating i nput v oltage 0.7 - - v operating v oltage 1 - 5.5 v apw7077_33, io<10ma - 0.9 - v apw7077_33, 10ma 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 . 7 - j u n . , 2 0 0 9 a p w 7 0 7 7 / a w w w . a n p e c . c o m . t w 5 20 30 40 50 60 70 80 90 100 1 10 100 20 30 40 50 60 70 80 90 100 1 10 100 1000 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 0 50 100 150 200 250 300 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 0 50 100 150 200 250 300 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 s t a r t - u p / h o l d v o l t a g e v s . o u t p u t c u r r e n t o u t p u t c u r r e n t ( m a ) input voltage (v) v s t a r t - u p v h o l d v o u t = 3 . 3 v s t a r t - u p / h o l d v o l t a g e v s . o u t p u t c u r r e n t o u t p u t c u r r e n t ( m a ) input voltage (v) v s t a r t - u p v h o l d v o u t = 5 . 0 v 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 o u t p u t c u r r e n t ( m a ) efficiency(%) v d d = 5 v v d d = 3 . 3 v v o u t = 1 2 v l = 1 0 m f 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 o u t p u t c u r r e n t ( m a ) efficiency(%) v o u t = 5 v l = 1 0 m h v d d = 3 v v d d = 2 v
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 . 7 - j u n . , 2 0 0 9 a p w 7 0 7 7 / a w w w . a n p e c . c o m . t w 6 270 280 290 300 310 320 330 -40 -20 0 20 40 60 80 3.20 3.22 3.24 3.26 3.28 3.30 3.32 3.34 3.36 3.38 3.40 -40 -20 0 20 40 60 80 4.98 4.985 4.99 4.995 5 5.005 5.01 5.015 5.02 0 200 400 600 800 1000 3.28 3.285 3.29 3.295 3.3 3.305 3.31 3.315 3.32 0 200 400 600 800 1000 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 . ) 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 output voltage (v) o u t p u t c u r r e n t ( m a ) v i n = 2 . 5 v v i n = 1 . 2 v v i n = 2 . 0 v v o u t = 3 . 3 v 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 output voltage (v) o u t p u t c u r r e n t ( m a ) v i n = 3 . 0 v v i n = 1 . 2 v v i n = 2 . 0 v v o u t = 5 . 0 v o u t p u t v o l t a g e v s . t e m p e r a t u r e t e m p e r a t u r e ( c ) output voltage (v) o s c i l l a t i o n f r e q u e n c y v s . t e m p e r a t u r e t e m p e r a t u r e ( c ) oscillation frequency (khz)
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 . 7 - j u n . , 2 0 0 9 a p w 7 0 7 7 / a 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 . ) 0 20 40 60 80 100 120 140 160 0 1 2 3 4 5 6 1 10 100 0 1 2 3 4 5 6 l o a d t r a n s i e n t w a v e f o r m l o a d t r a n s i e n t w a v e f o r m e x t d r i v i n g c u r r e n t v s . s u p p l y v o l t a g e e x t r d s , o n v s . s u p p l y v o l t a g e v i n = 3 . 3 v , v o u t = 1 2 v , i o u t = 5 m a - > 5 0 m a - > 5 m a l = 1 0 m h , c o u t = 4 . 7 m f + 0 . 1 m f , c f f = 5 6 0 p f c h 1 : v o u t , 1 0 0 m v / d i v , t i m e = 1 m s / d i v c h 4 : i o u t , 2 0 m a / d i v v i n = 3 . 3 v , v o u t = 5 v , i o u t = 1 0 m a - > 3 0 0 m a - > 1 0 m a l = 1 0 m h , c o u t = 2 2 m f + 2 2 m f + 0 . 1 m f , c f f = 3 3 p f c h 1 : v o u t , 1 0 0 m v / d i v , t i m e = 1 m s / d i v c h 4 : i o u t , 2 0 0 m a / d i v s u p p l y v o l t a g e ( v ) s u p p l y v o l t a g e ( v ) sink/source current (ma) rds,on resistance ( w ) i s i n k ( e x t = 0 . 4 v ) i s o u r c e ( e x t = v d d - 0 . 4 v ) e x t t o v d d e x t t o g n 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 . 7 - j u n . , 2 0 0 9 a p w 7 0 7 7 / a w w w . a n p e c . c o m . t w 8 0 50 100 150 200 250 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 0 0.5 1 1.5 2 2.5 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 0 50 100 150 200 250 300 350 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 0 10 20 30 40 50 60 70 80 90 100 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 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 . ) s u p p l y v o l t a g e ( v ) s u p p l y v o l t a g e ( v ) o s c i l l a t i o n f r e q u e n c y v s . s u p p l y v o l t a g e oscillation frequency (khz) m a x i m u m d u t y v s . s u p p l y v o l t a g e maximum duty (%) f e e d b a c k v o l t a g e v s . s u p p l y v o l t a g e s u p p l y v o l t a g e ( v ) s u p p l y v o l t a g e ( v ) feedback voltage (v) supply current ( m a) s u p p l y c u r r e n t v s . s u p p l y v o l t a g e s w i t c h i n g m o d e n o n s w i t c h i n g m o d 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 . 7 - j u n . , 2 0 0 9 a p w 7 0 7 7 / a w w w . a n p e c . c o m . t w 9 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 . ) 0.980 0.985 0.990 0.995 1.000 1.005 1.010 1.015 1.020 -40 -20 0 20 40 60 80 t e m p e r a t u r e ( c ) feedback voltage (v) f e e d b a c k v o l t a g e v s . t e m p e r a t u r e pin no. apw7077 apw7077a name f unction 1 3 ce chip enable input. high = operating mode; low = shutdown mode 5 5 ext external mosfet or transistor drive pin. 4 4 gnd ground pins of the circuit. - 2 v dd supply voltage. - 1 fb fb: internal 1. 0 v refe rence voltage. use a resistor divider to set the output voltage from and v out = ? ? ? ? ? + 1 r 2 r 1 v fb . 3 - nc no internal connection to the pin. 2 - v out v out provides bootstrap power to the ic. p i n d e s c r i p i t i o 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 . 7 - j u n . , 2 0 0 9 a p w 7 0 7 7 / a w w w . a n p e c . c o m . t w 1 0 b l o c k d i a g r a m driver pwm controller phase compensation soft-start voltage reference ramp gen. ext v o ut nc gnd ce v dd v dd v d d oscillator error amp. pwm comp. apw7077 v ref =1.0v v dd driver pwm controller phase compensation soft-start voltage reference ramp gen. ext v dd gnd ce v dd v dd oscillator error amp. pwm comp. v d d apw7077a fb v d 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 . 7 - j u n . , 2 0 0 9 a p w 7 0 7 7 / a w w w . a n p e c . c o m . t w 1 1 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 fb ce vdd ext gnd vin r2 820k/620k r1/75k apm2300a 10 m h/1.5a ss12 4.7 m f 1 m f 2r2 2.5~5.2v c ff /1000pf apw7077a v out =(1+r2/r1)*1.0v 9~12v/50ma 0.1 m f application circuit for apw7077a 10 m f ce vout ext gnd vin vout=3.3v(apw7077-33) apm2300a ss12 1 m f apw7077 nc vout=5v(apw7077-50) 100 m f 100 m f application circuit for apw7077 10 m f 10 m h/1.5a fb ce vdd ext gnd vin r2/300k r1/75k apm2300a ss12 c ff /33pf apw7077a v out =(1+r2/r1)*1.0v 3~5v 10 m f 100 m f 10 m h/1.5a application circuit for apw7077a *r1 ?? 100k w is recommended 100 m f 1 m f
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 . 7 - j u n . , 2 0 0 9 a p w 7 0 7 7 / a w w w . a n p e c . c o m . t w 1 2 f u n c t i o n d e s c r i p t i o n f o r a p w 7 0 7 7 a , t h e o u t p u t v o l t a g e i s a d j u s t a b l e . t h e o u t - p u t v o l t a g e i s s e t u s i n g t h e f b p i n a n d a r e s i s t o r d i v i d e r c o n n e c t e d t o t h e o u t p u t a s s h o w n i n t h e t y p i c a l o p e r a t i n g c i r c u i t . t h e i n t e r n a l r e f e r e n c e v o l t a g e i s 1 . 0 v w i t h 2 % v a r i a t i o n , s o t h e r a t i o o f t h e f e e d b a c k r e s i s t o r s s e t s t h e o u t p u t v o l t a g e a c c o r d i n g t o t h e f o l l o w i n g e q u a t i o n : o p e r a t i o n t h e a p w 7 0 7 7 / a s e r i e s a r e l o w n o i s e f i x e d f r e q u e n c y v o l t - a g e - m o d e p w m d c - d c c o n t r o l l e r s , a n d c o n s i s t o f s t a r t - u p c i r c u i t , r e f e r e n c e v o l t a g e , o s c i l l a t o r , l o o p c o m p e n s a - t i o n n e t w o r k , p w m c o n t r o l c i r c u i t , a n d l o w o n r e s i s t a n c e d r i v e r . a p w 7 0 7 7 p r o v i d e s o n ? c h i p f e e d b a c k r e s i s t o r a n d l o o p c o m p e n s a t i o n n e t w o r k , t h e s y s t e m d e s i g n e r c a n g e t t h e r e g u l a t e d f i x e d o u t p u t v o l t a g e 3 . 3 v a n d 5 . 0 v w i t h a s m a l l n u m b e r o f e x t e r n a l c o m p o n e n t s , i t i s o p t i m i z e d f o r b a t - t e r y p o w e r e d p o r t a b l e p r o d u c t s w h e r e l a r g e o u t p u t c u r - r e n t i s r e q u i r e d . a p w 7 0 7 7 a p r o v i d e s i n t e r n a l r e f e r e n c e v o l t a g e 1 . 0 v a n d o u t p u t v o l t a g e s e t t i n g b y e x t e r n a l r e s i s - t a n c e f o r h i g h e r v o l t a g e r e q u i r e m e n t . t h e q u i e s c e n t c u r - r e n t i s t y p i c a l l y 1 2 0 m a ( v o u t = 3 . 3 v , f s w = 3 0 0 k h z ) , a n d c a n b e f u r t h e r r e d u c e d t o a b o u t 1 . 0 m a w h e n t h e c h i p i s d i s - a b l e d ( v c e < 0 . 7 v ) . t h e a p w 7 0 7 7 / a o p e r a t i o n c a n b e b e s t u n d e r s t o o d b y r e - f e r r i n g t o t h e b l o c k d i a g r a m . t h e e r r o r a m p l i f i e r m o n i t o r s t h e o u t p u t v o l t a g e v i a t h e f e e d b a c k r e s i s t o r d i v i d e r b y c o m - p a r i n g t h e f e e d b a c k v o l t a g e w i t h t h e r e f e r e n c e v o l t a g e . w h e n t h e f e e d b a c k v o l t a g e i s l o w e r t h a n t h e r e f e r e n c e v o l t a g e , t h e e r r o r a m p l i f i e r o u t p u t w i l l d e c r e a s e . t h e e r r o r a m p l i f i e r o u t p u t i s t h e n c o m p a r e d w i t h t h e o s c i l l a t o r r a m p v o l t a g e a t t h e p w m c o n t r o l l e r . w h e n t h e f e e d b a c k v o l t a g e i s h i g h e r t h a n t h e r e f e r e n c e v o l t a g e , t h e e r r o r a m p l i f i e r o u t p u t i n c r e a s e s a n d t h e d u t y c y c l e d e c r e a s e s . w h e n t h e e x t e r n a l p o w e r s w i t c h i s o n , t h e c u r r e n t r a m p s u p i n t h e i n d u c t o r , s t o r i n g e n e r g y i n t h e m a g n e t i c f i e l d . w h e n t h e e x t e r n a l p o w e r s w i t c h i s o f f , t h e e n e r g y s t o r e d i n t h e m a g n e t i c f i e l d i s t r a n s f e r r e d t o t h e o u t p u t f i l t e r c a p a c i t o r a n d t h e l o a d . t h e o u t p u t f i l t e r c a - p a c i t o r s t o r e s t h e c h a r g e w h i l e t h e i n d u c t o r c u r r e n t i s h i g h e r t h a n t h e o u t p u t c u r r e n t , a n d t h e n s u s t a i n s t h e o u t - p u t v o l t a g e u n t i l t h e n e x t s w i t c h i n g c y c l e . a s t h e l o a d c u r r e n t d e c r e a s e s , t h e s w i t c h t r a n s i s t o r t u r n s o n f o r a s h o r t e r d u t y c y c l e . u n d e r t h e l i g h t l o a d c o n d i t i o n , t h e c o n t r o l l e r w i l l s k i p s w i t c h i n g c y c l e s t o r e d u c e p o w e r c o n s u m p t i o n , t h e r e f o r e , h i g h e f f i c i e n c y i s m a i n t a i n e d a t l i g h t l o a d s . f i x e d o u t p u t v o l t a g e ( f o r a p w 7 0 7 7 o n l y ) t h e a p w 7 0 7 7 v o u t i s s e t b y a n i n t e g r a t e f e e d b a c k r e s i s - t o r n e t w o r k . t h i s i s t r i m m e d t o a s e l e c t e d v o l t a g e 3 . 3 v o r 5 . 0 v w i t h a n a c c u r a c y o f + / - 2 . 5 % . s e t t i n g o u t p u t v o l t a g e ( f o r a p w 7 0 7 7 a o n l y ) 1.0v ) r1 r2 (1 v out + = s o f t - s t a r t o s c i l l a t o r t h e o s c i l l a t o r f r e q u e n c y i s i n t e r n a l l y s e t t o 3 0 0 k h z a t a n a c c u r a c y o f + / - 1 0 % a n d w i t h l o w t e m p e r a t u r e c o e f f i c i e n t o f 3 . 3 % / c . e n a b l e / d i s a b l e o p e r a t i o n t h e a p w 7 0 7 7 / a s e r i e s o f f e r i c s h u t d o w n m o d e b y c h i p e n a b l e p i n ( c e p i n ) t o r e d u c e c u r r e n t c o n s u m p t i o n . w h e n v o l t a g e a t p i n c e i s g r e a t e r t h a n 1 . 2 v , t h e c h i p w i l l b e e n a b l e d , w h i c h m e a n s t h e c o n t r o l l e r i s i n n o r m a l o p e r a t i o n . w h e n v o l t a g e a t p i n c e i s l e s s t h a n 0 . 7 v , t h e c h i p i s d i s a b l e d , w h i c h m e a n s i c i s s h u t d o w n a n d q u i - e s c e n t c u r r e n t b e c o m e s 1 m a . to avoid the thermal noise from feedback resistor, (r 1 +r 2 ) resistance smaller than 1m w and 1% variation is recommended. t h e r e i s a s o f t - s t a r t f u n c t i o n i n t e g r a t e d i n a p w 7 0 7 7 / a s e r i e s t o a v o i d t h e o v e r s h o o t i n g w h e n p o w e r o n . w h e n p o w e r i s a p p l i e d t o t h e d e v i c e , t h e s o f t - s t a r t c i r c u i t f i r s t p u m p s u p t h e o u t p u t v o l t a g e t o l e t v d d ( o r v o u t ) a p p r o x i - m a t e l y 1 . 6 5 v a t a f i x e d d u t y c y c l e 5 0 % . t h i s i s t h e v o l t a g e l e v e l a t w h i c h t h e c o n t r o l l e r c a n o p e r a t e n o r m a l l y . w h e n s u p p l y v o l t a g e m o r e t h a n 1 . 6 5 v , t h e i n t e r n a l r e f e r e n c e v o l t a g e w i l l b e r a m p u p t o l e t o u t p u t v o l t a g e r e a c h t o s e t - t i n g v o l t a g e w i t h o u t o v e r s h o o t i n g i s s u e w h e n e v e r h e a v y l o a d o r l i g h t l o a d c o n d i t i o n . t h e s o f t - s t a r t t i m e 2 5 m s i s s e t t i n g b y i n t e r n a l c i r c u i t .
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 . 7 - j u n . , 2 0 0 9 a p w 7 0 7 7 / a 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 ( c o n t . ) e n a b l e / d i s a b l e o p e r a t i o n ( c o n t . ) t h e c e p i n i s p u l l e d h i g h t o v d d ( o r v o u t ) b y i n t e r n a l r e s i s t o r , a n d t h i s r e s i s t a n c e i s g r e a t e r t h a n 1 m w. t h e r e f o r e , t h i s c h i p w i l l e n a b l e n o r m a l l y w h e n c e p i n i s f l o a t i n g . i m p o r t a n t : d o n o t a p p l y a v o l t a g e b e t w e e n 0 . 7 v a n d 1 . 2 v t o p i n c e a s t h i s i s t h e c e p i n ? s h y s t e r e s i s v o l t a g e r a n g e . c l e a r l y d e f i n e d o u t p u t s t a t e s c a n o n l y b e o b t a i n e d b y a p - p l y i n g v o l t a g e o u t o f t h i s r a n g e . c o m p e n s a t i o n t h e d e v i c e i s d e s i g n e d t o o p e r a t e i n c o n t i n u o u s c o n d u c - t i o n m o d e . a n i n t e r n a l c o m p e n s a t i o n c i r c u i t w a s d e s i g n e d t o g u a r a n t e e s t a b i l i t y o v e r t h e f u l l i n p u t / o u t p u t v o l t a g e a n d f u l l o u t p u t l o a d r a n g e . s t e p - u p c o n v e r t e r o p e r a t i n g m o d e t h e s t e p - u p d c - d c c o n t r o l l e r i s d e s i g n e d t o o p e r a t e i n c o n t i n u o u s c o n d u c t i o n m o d e ( c c m ) o r d i s c o n t i n u o u s c o n d u c t i o n m o d e ( d c m ) . f o r a s t e p u p c o n v e r t e r i n a c c m , t h e d u t y c y c l e d i s g i v e n b y : out in out v v v d - = i n h i g h e r o u t p u t v o l t a g e o r s m a l l o u t p u t c u r r e n t a p p l i c a t i o n , t h e s t e p - u p d c - d c c o n t r o l l e r o p e r a t e d i n d i s c o n t i n u o u s c o n d u c t i o n m o d e a l m o s t . f o r a s t e p - u p c o n v e r t e r i n a d c m , t h e d u t y c y c l e d i s g i v e n b y : e x t e r n a l c o m p o n e n t s v a l u e s c a n b e c a l c u l a t e d f r o m t h e s e e q u a t i o n s , h o w e v e r , t h e o p t i m i z e d v a l u e s h o u l d o b t a i n e d t h r o u g h e x p e r i m e n t a l r e s u l t s . c r i t i c a l i n d u c t a n c e v a l u e t h e m i n i m u m v a l u e o f i n d u c t o r t o m a i n t a i n c o n t i n u o u s c o n d u c t i o n m o d e c a n b e d e t e r m i n e d b y t h e f o l l o w i n g e q u a t i o n . a s y s t e m c a n b e d e s i g n e d t o o p e r a t e i n c o n t i n u o u s m o d e f o r l o a d c u r r e n t s a b o v e a c e r t a i n l e v e l u s u a l l y 2 0 t o 5 0 % ( r a t i o d e f i n e a s 0 . 2 ~ 0 . 5 ) o f f u l l l o a d a t m i n i m u m i n p u t v o l t a g e . w h e n i o s m a l l e r t h a n ( i o * r a t i o ) , t h e c o n t r o l l e r s y s t e m w i l l i n t o d c m . d i l i s t h e r i p p l e c u r r e n t f l o w i n g t h r o u g h t h e i n d u c t o r , w h i c h a f f e c t s t h e o u t p u t v o l t a g e r i p p l e a n d c o r e l o s s e s . b a s e d o n 2 0 % ( r a t i o = 0 . 2 ) c u r r e n t r i p p l e , v o u t = 5 v , i o = 1 a a n d v i n = 1 . 8 v s y s t e m , t h e i n d u c t a n c e v a l u e i s c a l c u l a t e d a s 6 . 9 m h a n d a 6 . 8 m h i n d u c t o r i s u s e d . t h e i n d u c t o r c u r r e n t r i p p l e h a s a n e x p r e s s i o n : l fsw d v i in l = d t h e m a x i m u m d c i n p u t c u r r e n t c a n b e c a l c u l a t e d a s : (min) v (max) i v (max) i in o out l = t h e i n d u c t o r p e a k c u r r e n t c a n b e c a l c u l a t e d a s : i n d u c t o r s e l e c t i o n a p w 7 0 7 7 / a s e r i e s a r e d e s i g n e d t o w o r k w e l l w i t h a 6 . 8 t o 1 2 m h i n d u c t o r s . i n m o s t a p p l i c a t i o n s , 1 0 m h i s a s u f f i - c i e n t l y l o w v a l u e t o a l l o w t h e u s e o f a s m a l l s u r f a c e m o u n t c o i l b u t l a r g e e n o u g h t o m a i n t a i n l o w r i p p l e . l o w e r i n - d u c t a n c e v a l u e s n o t o n l y s u p p l y h i g h e r o u t p u t c u r r e n t b u t a l s o i n c r e a s e t h e r i p p l e a n d r e d u c e e f f i c i e n c y . h i g h e r i n - d u c t o r v a l u e s n o t o n l y r e d u c e r i p p l e a n d i m p r o v e e f f i c i e n c y b u t a l s o l i m i t o u t p u t c u r r e n t . t h e i n d u c t o r s h o u l d h a v e s m a l l d c r , u s u a l l y l e s s t h a n 0 . 2 w , t o m i n i m i z e l o s s . i t i s n e c e s s a r y t o c h o o s e a n i n d u c t o r w i t h a s a t u r a t i o n c u r - r e n t g r e a t e r t h a n t h e p e a k c u r r e n t w h i c h t h e i n d u c t o r w i l l e n c o u n t e r i n t h e a p p l i c a t i o n . 2 i v i v i l in o out pk d + = ? ? ? ? ? - = 1 v v v v r t l 2 d in out in out load s ratio i f d) d(1 v l o sw 2 out - 3 n o t e s : d - o n - t i m e d u t y c y c l e i l - a v e r a g e i n d u c t o r c u r r e n t i p k - p e a k i n d u c t o r c u r r e n t i o - d e s i r e d d c o u t p u t c u r r e n t v i n - n o m i n a l o p e r a t i n g d c i n p u t v o l t a g e v o u t - d e s i r e d d c o u t p u t v o l t a g e e s r - e q u i v a l e n t s e r i e s r e s i s t a n c e o f t h e o u t p u t c a p a c i t o r
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 . 7 - j u n . , 2 0 0 9 a p w 7 0 7 7 / a 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 . ) t h e i n d u c t o r r i p p l e c u r r e n t i s i m p o r t a n t f o r a f e w r e a s o n s . o n e r e a s o n i s t h e p e a k s w i t c h c u r r e n t w i l l b e 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 ( i l ) p l u s d i l . a s a s i d e n o t e , d i s c o n t i n u o u s o p e r a t i o n o c c u r s w h e n t h e i n d u c t o r c u r r e n t f a l l s t o z e r o d u r i n g a s w i t c h i n g c y c l e , o r d i l i s g r e a t e r t h a n 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 . t h e r e f o r e , c o n t i n u o u s c o n d u c t i o n m o d e o c c u r s w h e n d i l i s l e s s t h a n 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 . c a r e m u s t b e t a k e n t o m a k e s u r e t h a t t h e s w i t c h w i l l n o t r e a c h i t s c u r r e n t l i m i t 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 d u c t o r m u s t a l s o b e s i z e d a c c o r d i n g l y . i t s h o u l d h a v e a s a t u r a t i o n c u r r e n t r a t i n g h i g h e r t h a n t h e p e a k i n - d u c t o r c u r r e n t e x p e c t e d . t h e o u t p u t v o l t a g e r i p p l e i s a l s o a f f e c t e d b y t h e t o t a l r i p p l e c u r r e n t . i n d u c 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 t h e o u t p u t c a p a c i t o r i s u s e d f o r s u s t a i n i n g t h e o u t p u t v o l t a g e w h e n t h e e x t e r n a l m o s f e t o r b i p o l a r t r a n s i s t o r i s s w i t c h e d o n a n d s m o o t h i n g t h e r i p p l e v o l t a g e . t h e o u t p u t c a p a c i t a n c e n e e d e d i s c a l c u l a t e d i n e q u a t i o n . t h e e s r i s a l s o i m p o r t a n t b e c a u s e i t d e t e r m i n e s t h e p e a k t o p e a k o u t p u t v o l t a g e r i p p l e a c c o r d i n g t o t h e a p - p r o x i m a t e d e q u a t i o n : with 1% output voltage ripple, low esr capacitor should be used to reduce output ripple voltage. in general, a 100 m f to 220 m f low esr (0.10 w to 0.30 w ) tantalum ca- pacitor should be appropriate. the choice of output ca- pacitors is also somewhat arbitrary and depends on the design requirements for output voltage ripple. a minimum value of 10 m f is recommended and may be increased to a larger value. o out i v esr d d = out sw o(max) out(min) v f d i c d = i n p u t c a p a c i t o r t h e i n p u t c a p a c i t o r c a n s t a b i l i z e t h e i n p u t v o l t a g e a n d m i n i m i z e p e a k c u r r e n t r i p p l e f r o m t h e s o u r c e . t h e s i z e u s e d i s d e p e n d a n t o n t h e a p p l i c a t i o n a n d b o a r d l a y o u t . i f t h e r e g u l a t o r w i l l b e l o a d e d u n i f o r m l y , w i t h v e r y l i t t l e l o a d c h a n g e s , a n d a t l o w e r c u r r e n t o u t p u t s , t h e i n p u t c a p a c i t o r s i z e c a n o f t e n b e r e d u c e d . t h e s i z e c a n a l s o b e r e d u c e d i f t h e i n p u t o f t h e r e g u l a t o r i s v e r y c l o s e t o t h e s o u r c e o u t p u t . t h e s i z e w i l l g e n e r a l l y n e e d t o b e l a r g e r f o r a p p l i - c a t i o n s w h e r e t h e r e g u l a t o r i s s u p p l y i n g n e a r l y t h e m a x i - m u m r a t e d o u t p u t o r i f l a r g e l o a d s t e p s a r e e x p e c t e d . a m i n i m u m v a l u e o f 1 0 m f s h o u l d b e u s e d f o r t h e l e s s s t r e s s f u l c o n d i t i o n s w h i l e a 2 2 m f t o 4 7 m f c a p a c i t o r m a y b e r e q u i r e d f o r h i g h e r p o w e r a n d d y n a m i c l o a d s . s m a l l e s r t a n t a l u m o r c e r a m i c c a p a c i t o r s h o u l d b e s u i t a b l e a n d t h e t o t a l i n p u t r i p p l e v o l t a g e c a n b e c a l c u l a t e d : d e s i g n e x a m p l e it is supposed that a step-up dc-dc controller with 3.3v output delivering a maximum 1000ma output current with 100 mv output ripple voltage powering from a 2.4v input is to be designed. design parameters: v in = 2.4v v out = 3.3v i o = 1.0a dv out = 100mv f sw = 300khz ratio = 0.2 (typical for small output ripple voltage) assume the diode forward voltage and the transistor satu- ration voltage are both 0.3v. determine the maximum steady state duty cycle at v in = 2.4v: d=0.273 c a l c u l a t e t h e m a x i m u m i n d u c t a n c e v a l u e w h i c h c a n g e n - e r a t e t h e d e s i r e d c u r r e n t o u t p u t a n d t h e p r e f e r r e d d e l t a i n d u c t o r c u r r e n t t o a v e r a g e i n d u c t o r c u r r e n t r a t i o : l = 1 0 m h d e t e r m i n e 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 a n d p e a k i n d u c - t o r c u r r e n t : i l = 1 . 3 8 a d i l = 0 . 2 1 8 a i p k = 1 . 4 5 a t h e r e f o r e , a 1 0 m h i n d u c t o r w i t h s a t u r a t i o n c u r r e n t l a r g e r t h a n 1 . 7 3 a c a n b e s e l e c t e d a s t h e i n i t i a l t r i a l . d e t e r m i n e t h e o u t p u t c a p a c i t a n c e v a l u e f o r t h e d e s i r e d o u t p u t r i p p l e v o l t a g e : c o u t = 3 3 m f esr i v l in d = 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 . 7 - j u n . , 2 0 0 9 a p w 7 0 7 7 / a w w w . a n p e c . c o m . t w 1 5 f u n c t i o n d e s c r i p t i o n ( c o n t . ) t h e e s r o f t h e o u t p u t c a p a c i t o r i s 0 . 0 5 w . t h e r e f o r e , a t a n t a l u m c a p a c i t o r w i t h v a l u e o f 3 3 m f t o 4 7 m f a n d e s r o f 0 . 0 5 w c a n b e u s e d a s t h e o u t p u t c a p a c i t o r . h o w e v e r , a c - c o r d i n g t o e x p e r i m e n t a l r e s u l t , 2 2 0 m f o u t p u t c a p a c i t o r g i v e s b e t t e r o v e r a l l o p e r a t i o n a l s t a b i l i t y a n d s m a l l e r r i p p l e v o l t a g e . d e s i g n e x a m p l e ( c o n t . )
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 . 7 - j u n . , 2 0 0 9 a p w 7 0 7 7 / a w w w . a n p e c . c o m . t w 1 6 c o m p o n e n t s e l e c t i o n d i o d e s e l e c t i o n t h e o u t p u t d i o d e f o r a b o o s t r e g u l a t o r m u s t b e c h o s e n c o r r e c t l y d e p e n d i n g o n t h e o u t p u t v o l t a g e a n d t h e o u t p u t c u r r e n t . t h e d i o d e m u s t b e r a t e d f o r a r e v e r s e v o l t a g e e q u a l t o o r g r e a t e r t h a n t h e o u t p u t v o l t a g e u s e d . t h e a v - e r a g e c u r r e n t r a t i n g m u s t b e g r e a t e r t h a n t h e m a x i m u m l o a d c u r r e n t e x p e c t e d , a n d t h e p e a k c u r r e n t r a t i n g m u s t b e g r e a t e r t h a n t h e p e a k i n d u c t o r c u r r e n t . d u r i n g s h o r t c i r c u i t t e s t i n g , o r i f s h o r t c i r c u i t c o n d i t i o n s a r e p o s s i b l e i n t h e a p p l i c a t i o n , t h e d i o d e c u r r e n t r a t i n g m u s t e x c e e d t h e s w i t c h c u r r e n t l i m i t . t h e d i o d e i s t h e l a r g e s t s o u r c e o f l o s s i n d c - d c c o n v e r t e r s . t h e m o s t i m p o r t a n c e p a r a m - e t e r s w h i c h a f f e c t t h e i r e f f i c i e n c y a r e t h e f o r w a r d v o l t a g e d r o p , v f , a n d t h e r e v e r s e r e c o v e r y t i m e , t r . t h e f o r w a r d v o l t a g e d r o p c r e a t e s a l o s s j u s t b y h a v i n g a v o l t a g e a c r o s s t h e d e v i c e w h i l e a c u r r e n t f l o w i n g t h r o u g h i t . t h e r e v e r s e r e c o v e r y t i m e g e n e r a t e s a l o s s w h e n t h e d i o d e i s r e - v e r s e b i a s e d , a n d t h e c u r r e n t a p p e a r s t o a c t u a l l y f l o w b a c k - w a r d s t h r o u g h t h e d i o d e d u e t o t h e m i n o r i t y c a r r i e r s b e - i n g s w e p t f r o m t h e p - n j u n c t i o n . u s i n g s c h o t t k y d i o d e s w i t h l o w e r f o r w a r d v o l t a g e d r o p w i l l d e c r e a s e p o w e r d i s - s i p a t i o n a n d i n c r e a s e e f f i c i e n c y . e x t e r n a l s w i t c h t r a n s i s t o r t h e a p w 7 0 7 7 / a c a n d r i v e u p t o 1 1 0 m a o f g a t e d r i v e c u r r e n t . a n n - c h a n n e l m o s f e t w i t h a r e l a t i v e l y l o w t h r e s h - o l d v o l t a g e , l o w g a t e c h a r g e a n d l o w r d s ( o n ) i s r e q u i r e d t o o p t i m i z e o v e r a l l c i r c u i t p e r f o r m a n c e . t h e a p w 7 0 7 7 / a e v a l u a t i o n b o a r d u s e s a a p m 2 3 0 0 a . t h i s n m o s d e v i c e w a s c h o s e n b e c a u s e i t d e m o n s t r a t e s a n r d s _ o n o f 4 5 m w a n d a t o t a l g a t e c h a r g e q g o f 1 2 n c ( t y p . ) .
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 . 7 - j u n . , 2 0 0 9 a p w 7 0 7 7 / a w w w . a n p e c . c o m . t w 1 7 o u t p u t c a p a c i t o r l a y o u t c o n s i d e r a t i o n i n a p w 7 0 7 7 a h i g h o u t p u t v o l t a g e a p p l i c a t i o n c i r c u i t , t h e i n p u t v o l t a g e ( v i n ) i s t i e d t o c h i p s u p p l y p i n ( v d d ) . t h e i n p u t c a p a c i t o r c i n i n v i n m u s t b e p l a c e d c l o s e t o t h e i c . t h i s w i l l r e d u c e c o p p e r t r a c e r e s i s t a n c e w h i c h e f f e c t s i n p u t v o l t - a g e r i p p l e o f t h e i c . f o r a d d i t i o n a l i n p u t v o l t a g e f i l t e r i n g , a 1 m f c a p a c i t o r c a n b e p l a c e d i n p a r a l l e l w i t h c i n , c l o s e t o t h e v d d p i n , t o s h u n t a n y h i g h f r e q u e n c y n o i s e t o t h e g r o u n d . s u r f a c e m o u n t b o a r d l a y o u t i s a c r i t i c a l p o r t i o n o f t h e t o t a l d e s i g n . t h e f o o t p r i n t f o r t h e s e m i c o n d u c t o r p a c k a g e s m u s t b e t h e c o r r e c t s i z e t o i n s u r e p r o p e r s o l d e r c o n n e c - t i o n i n t e r f a c e b e t w e e n t h e b o a r d a n d t h e p a c k a g e . w i t h t h e c o r r e c t p a d g e o m e t r y , t h e p a c k a g e s w i l l s e l f a l i g n w h e n s u b j e c t e d t o a s o l d e r r e f l o w p r o c e s s . t h e o u t p u t c a p a c i t o r s h o u l d b e p l a c e d c l o s e t o t h e o u t p u t t e r m i n a l s t o o b t a i n b e t t e r s m o o t h i n g e f f e c t o n t h e o u t p u t r i p p l e . t h e o u t p u t c a p a c i t o r , c o u t , s h o u l d a l s o b e p l a c e d c l o s e t o t h e d i o d e . a n y c o p p e r t r a c e c o n n e c t i o n s f o r t h e c o u t c a p a c i t o r c a n i n c r e a s e t h e s e r i e s r e s i s t a n c e , w h i c h d i - r e c t l y e f f e c t s o u t p u t v o l t a g e r i p p l e a n d e f f i c i e n c y . f e e d b a c k n e t w o r k o n a p w 7 0 7 7 a a p p l i c a t i o n , t h e f e e d b a c k n e t w o r k s s h o u l d b e c o n n e c t e d d i r e c t l y t o a d e d i c a t e d a n a l o g g r o u n d p l a n e a n d t h i s g r o u n d p l a n e m u s t c o n n e c t t o t h e g n d p i n . i f n o a n a l o g g r o u n d p l a n e i s a v a i l a b l e , t h i s g r o u n d m u s t t i e d i r e c t l y t o t h e g n d p i n . t h e f e e d b a c k n e t w o r k , r e s i s - t o r s r 1 a n d r 2 , s h o u l d b e k e p t c l o s e t o t h e f b p i n a n d a w a y f r o m t h e i n d u c t o r , t o m i n i m i z e c o p p e r t r a c e c o n n e c - t i o n s t h a t c a n i n j e c t n o i s e i n t o t h e s y s t e m . p r e v e n t c o n - n e c t f e e d b a c k n e t w o r k o n o u t p u t d e c o u p l i n g m l c c . g r o u n d p l a n e o n e p o i n t g r o u n d i n g s h o u l d b e u s e d f o r t h e o u t p u t p o w e r r e t u r n g r o u n d , t h e i n p u t p o w e r r e t u r n g r o u n d , a n d t h e d e v i c e s w i t c h g r o u n d t o r e d u c e n o i s e . t h e i n p u t g r o u n d a n d o u t p u t g r o u n d t r a c e s m u s t b e t h i c k e n o u g h f o r c u r - r e n t t o f l o w t h r o u g h a n d f o r r e d u c i n g g r o u n d b o u n c e . p o w e r s i g n a l t r a c e s l o w r e s i s t a n c e c o n d u c t i n g p a t h s s h o u l d b e u s e d f o r t h e p o w e r c a r r y i n g t r a c e s t o r e d u c e p o w e r l o s s s o a s t o i m - p r o v e e f f i c i e n c y ( s h o r t a n d t h i c k t r a c e s f o r c o n n e c t i n g t h e i n d u c t o r l c a n a l s o r e d u c e s t r a y i n d u c t a n c e ) . t r a c e c o n - n e c t i o n s m a d e t o t h e i n d u c t o r a n d s c h o t t k y d i o d e s h o u l d b e m i n i m i z e d t o r e d u c e p o w e r d i s s i p a t i o n a n d i n c r e a s e o v e r a l l e f f i c i e n c y . s w i t c h i n g n o i s e d e c o u p l i n g c a p a c i t o r o n a p w 7 0 7 7 f i x e d v o l t a g e a p p l i c a t i o n , a 0 . 1 m f c e r a m i c c a p a c i t o r s h o u l d b e p l a c e d c l o s e t o t h e v o u t p i n a n d g n d p i n o f t h e c h i p t o f i l t e r t h e s w i t c h i n g s p i k e s i n t h e o u t p u t v o l t a g e m o n i t o r e d b y t h e v o u t p i n . i n p u t c a p a c i t o r i n d u c t o r to minimize copper trace connections that can inject noise into the system, the inductor, switch , and schottky diode should be placed as close as pos sible to minimize the noise coupling into other circuits. m i n i m u m r e c o m m e n d e d f o o t p r i n t f o r s u r f a c e m o u n t e d a p p l i c a t i o n s 75mil 50mil 20mil 15mil 100mil 1 5 0 m i l
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 . 7 - j u n . , 2 0 0 9 a p w 7 0 7 7 / a w w w . a n p e c . c o m . t w 1 8 l a y o u t c o n s i d e r a t i o n ( c o n t . ) d e m o b o a r d c i r c u i t l a y o u t m i n i m u m r e c o m m e n d e d f o o t p r i n t f o r s u r f a c e m o u n t e d a p p l i c a t i o n s t o p l a y o u t 1 3 0 0 m i l 1600mil b o t t o m l a y e r
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 . 7 - j u n . , 2 0 0 9 a p w 7 0 7 7 / a w w w . a n p e c . c o m . t w 1 9 p a c k a g e i n f o r m a t i o n s o t - 2 3 - 5 max. 0.057 0.051 0.024 0.006 0.009 0.020 0.012 l 0.30 0 e e1 e1 e d c b 0.08 0.30 0.60 0.012 0.95 bsc 1.90 bsc 0.22 0.50 0.037 bsc 0.075 bsc 0.003 min. millimeters s y m b o l a1 a2 a 0.00 0.90 sot-23-5 max. 1.45 0.15 1.30 min. 0.000 0.035 inches 8 0 8 0 b c e1 0 l view a 0 . 2 5 gauge plane seating plane a a 2 a 1 e d e e 1 see view a 1.40 2.60 1.80 3.00 2.70 3.10 0.122 0.071 0.118 0.102 0.055 0.106 note : 1. follow jedec to-178 aa. 2. dimension d and e1 do not include mold flash, protrusions or gate burrs. mold flash, protrusion or gate burrs shall not exceed 10 mil per side.
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 . 7 - j u n . , 2 0 0 9 a p w 7 0 7 7 / a w w w . a n p e c . c o m . t w 2 0 application a h t1 c d d w e1 f 178.0 ? 2.00 50 min. 8.4+2.00 - 0.00 13.0+0.50 - 0.20 1.5 min. 20.2 min. 8.0 ? 0.30 1.75 ? 0.10 3.5 ? 0.05 p 0 p1 p 2 d 0 d1 t a 0 b 0 k 0 sot - 23 - 5 4.0 ? 0.10 4.0 ? 0.10 2.0 ? 0.05 1.5+0.10 - 0.00 1.0 min. 0.6+0.00 - 0.4 0 3.20 ? 0.20 3.10 ? 0.20 1.50 ? 0.20 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 d e v i c e s p e r u n i t ( m m ) package type unit quantity sot - 23 - 5 tape & reel 3000 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 . 7 - j u n . , 2 0 0 9 a p w 7 0 7 7 / a w w w . a n p e c . c o m . t w 2 1 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 s o t - 2 3 - 5 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 . 7 - j u n . , 2 0 0 9 a p w 7 0 7 7 / a w w w . a n p e c . c o m . t w 2 2 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 spec ified 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 a s 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 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 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 r e l i a b i l i t y t e s t p r o g r a m test item method description solderability jesd - 22, b102 5 sec, 245 c holt jesd - 22, a108 1000 hrs, bias @ 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, a115 vmm ? 200v latch - up jesd 78 10ms, 1 tr ? 100ma
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 . 7 - j u n . , 2 0 0 9 a p w 7 0 7 7 / a w w w . a n p e c . c o m . t w 2 3 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

▲Up To Search▲

Price & Availability of APW7077ZBI-TRG

	To Download APW7077ZBI-TRG Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .