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tm ? 2 0 0 8 f a i r c h i l d s e m i c o n d u c t o r c o r p o r a t i o n 1 w w w . f a i r c h i l d s e m i . c o m f d m f 6 7 0 4 r e v . g f d m f 6 7 0 4 t h e x t r a s m a l l , h i g h p e r f o r m a n c e , h i g h f r e q u e n c y d r m o s m o d u l e a u g u s t 2 0 0 9 f d m f 6 7 0 4 - x s t m d r m o s t h e x t r a s m a l l , h i g h p e r f o r m a n c e , h i g h f r e q u e n c y d r m o s m o d u l e b e n e f i t s u l t r a c o m p a c t s i z e - 6 m m x 6 m m m l p , 4 4 % s p a c e s a v i n g c o m p a r e d t o c o n v e n t i o n a l m l p 8 m m x 8 m m d r m o s p a c k a g e s . f u l l y o p t i m i z e d s y s t e m e f f i c i e n c y . c l e a n v o l t a g e w a v e f o r m s w i t h r e d u c e d r i n g i n g . h i g h f r e q u e n c y o p e r a t i o n . c o m p a t i b l e w i t h a w i d e v a r i e t y o f p w m c o n t r o l l e r s i n t h e m a r k e t . f e a t u r e s u l t r a - c o m p a c t t h e r m a l l y e n h a n c e d 6 m m x 6 m m m l p p a c k a g e 8 4 % s m a l l e r t h a n c o n v e n t i o n a l d i s c r e t e s o l u t i o n s . s y n c h r o n o u s d r i v e r p l u s f e t m u l t i c h i p m o d u l e . h i g h c u r r e n t h a n d l i n g o f 3 5 a . o v e r 9 3 % p e a k e f f i c i e n c y . t r i - s t a t e p w m i n p u t . f a i r c h i l d ' s p o w e r t r e n c h ? 5 t e c h n o l o g y m o s f e t s f o r c l e a n v o l t a g e w a v e f o r m s a n d r e d u c e d r i n g i n g . o p t i m i z e d f o r h i g h s w i t c h i n g f r e q u e n c i e s o f u p t o 1 m h z . s k i p m o d e s m o d [ l o w s i d e g a t e t u r n o f f ] i n p u t . f a i r c h i l d s y n c f e t t m [ i n t e g r a t e d s c h o t t k y d i o d e ] t e c h n o l o g y i n t h e l o w s i d e m o s f e t . i n t e g r a t e d b o o t s t r a p s c h o t t k y d i o d e . a d a p t i v e g a t e d r i v e t i m i n g f o r s h o o t - t h r o u g h p r o t e c t i o n . d r i v e r o u t p u t d i s a b l e f u n c t i o n [ d i s b # p i n ] . u n d e r v o l t a g e l o c k o u t ( u v l o ) . f a i r c h i l d g r e e n p a c k a g i n g a n d r o h s c o m p l i a n t . l o w p r o f i l e s m d p a c k a g e . g e n e r a l d e s c r i p t i o n t h e x s t m d r m o s f a m i l y i s f a i r c h i l d s n e x t - g e n e r a t i o n f u l l y - o p t i m i z e d , u l t r a - c o m p a c t , i n t e g r a t e d m o s f e t p l u s d r i v e r p o w e r s t a g e s o l u t i o n s f o r h i g h c u r r e n t , h i g h f r e q u e n c y s y n c h r o n o u s b u c k d c - d c a p p l i c a t i o n s . t h e f d m f 6 7 0 4 x s t m d r m o s i n t e g r a t e s a d r i v e r i c , t w o p o w e r m o s f e t s a n d a b o o t s t r a p s c h o t t k y d i o d e i n t o a t h e r m a l l y e n h a n c e d , u l t r a c o m p a c t 6 m m x 6 m m m l p p a c k a g e . w i t h a n i n t e g r a t e d a p p r o a c h , t h e c o m p l e t e s w i t c h i n g p o w e r s t a g e i s o p t i m i z e d w i t h r e g a r d s t o d r i v e r a n d m o s f e t d y n a m i c p e r f o r m a n c e , s y s t e m i n d u c t a n c e a n d r d s ( o n ) . t h i s g r e a t l y r e d u c e s t h e p a c k a g e p a r a s i t i c s a n d l a y o u t c h a l l e n g e s a s s o c i a t e d w i t h c o n v e n t i o n a l d i s c r e t e s o l u t i o n s . x s t m d r m o s u s e s f a i r c h i l d ' s h i g h p e r f o r m a n c e p o w e r t r e n c h t m 5 m o s f e t t e c h n o l o g y , w h i c h d r a m a t i c a l l y r e d u c e s r i n g i n g i n s y n c h r o n o u s b u c k c o n v e r t e r a p p l i c a t i o n s . p o w e r t r e n c h t m 5 c a n e l i m i n a t e t h e n e e d f o r a s n u b b e r c i r c u i t i n b u c k c o n v e r t e r a p p l i c a t i o n s . t h e d r i v e r i c i n c o r p o r a t e s a d v a n c e d f e a t u r e s s u c h a s s m o d f o r i m p r o v e d l i g h t l o a d e f f i c i e n c y a n d a t r i - s t a t e p w m i n p u t f o r c o m p a t i b i l i t y w i t h a w i d e r a n g e o f p w m c o n t r o l l e r s . a 5 v g a t e d r i v e a n d a n i m p r o v e d p c b i n t e r f a c e o p t i m i z e d f o r a m a x i m u m l o w s i d e f e t e x p o s e d p a d a r e a , e n s u r e h i g h e r p e r f o r m a n c e . t h i s p r o d u c t i s c o m p a t i b l e w i t h t h e n e w i n t e l 6 m m x 6 m m d r m o s s p e c i f i c a t i o n . a p p l i c a t i o n s c o m p a c t b l a d e s e r v e r s v - c o r e , n o n v - c o r e a n d v t t d c - d c c o n v e r t e r s . d e s k t o p c o m p u t e r s v - c o r e , n o n v - c o r e a n d v t t d c - d c c o n v e r t e r s . w o r k s t a t i o n s v - c o r e , n o n v - c o r e a n d v t t d c - d c c o n v e r t e r s . g a m i n g m o t h e r b o a r d s v - c o r e , n o n v - c o r e a n d v t t d c - d c c o n v e r t e r s . g a m i n g c o n s o l e s . h i g h - c u r r e n t d c - d c p o i n t o f l o a d ( p o l ) c o n v e r t e r s . n e t w o r k i n g a n d t e l e c o m m i c r o p r o c e s s o r v o l t a g e r e g u l a t o r s . p o w e r t r a i n a p p l i c a t i o n c i r c u i t f i g u r e 1 . p o w e r t r a i n a p p l i c a t i o n c i r c u i t d i s b # p w m c g n d p g n d v c i n v i n b o o t v s w h d i s b # p w m i n p u t c v i n 1 2 v c b o o t c o u t o u t p u t 5 v c v d r v v d r v s m o d # o n o f f p h a s e o r d e r i n g i n f o r m a t i o n o r d e r n u m b e r m a r k i n g t e m p e r a t u r e r a n g e d e v i c e p a c k a g e p a c k i n g m e t h o d q u a n t i t y f d m f 6 7 0 4 f d m f 6 7 0 4 _ 1 - 5 5 c t o 1 5 0 c 4 0 p i n , 3 d a p , m l p 6 x 6 m m t a p e a n d r e e l 3 0 0 0 l o u t r b o o t
2 w w w . f a i r c h i l d s e m i . c o m f d m f 6 7 0 4 r e v . g f d m f 6 7 0 4 t h e x t r a s m a l l , h i g h p e r f o r m a n c e , h i g h f r e q u e n c y d r m o s m o d u l e f u n c t i o n a l b l o c k d i a g r a m p i n c o n f i g u r a t i o n f i g u r e 2 . f u n c t i o n a l b l o c k d i a g r a m c g n d p g n d v s w h v i n b o o t v c i n v d r v g h g l v d r v p w m d i s b # o v e r l a p c o n t r o l s m o d # q 1 q 2 f i g u r e 3 . 6 m m x 6 m m , 4 0 l m l p c g n d v i n v s w h c g n d v i n v s w h p w m s m o d # d i s b # n c c g n d g l v s w h v s w h v s w h v s w h v s w h v c i n v d r v b o o t c g n d g h n c v i n v i n v i n v i n v i n v i n v s w h p g n d v s w h v s w h p g n d p g n d p g n d p g n d p g n d p g n d p g n d p h a s e p g n d p g n d p g n d p g n d p g n d b o t t o m v i e w t o p v i e w 1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 3 0 2 9 2 8 2 7 2 6 2 5 2 4 2 3 2 2 2 1 4 0 3 9 3 8 3 7 3 6 3 5 3 4 3 3 3 2 3 1 12 3 4 5 6 7 8 9 1 0 4 0 3 9 3 8 3 7 3 6 3 5 3 4 3 3 3 2 3 1 3 0 2 9 2 8 2 7 2 6 2 5 2 4 2 3 2 2 2 1 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 s m o d # v c i n v d r v b o o t c g n d g h n c v i n v i n p h a s e v i n v i n v i n v i n v s w h p g n d p g n d p g n d p g n d p g n d p g n d v s w h v s w h p g n d p g n d p g n d p g n d p g n d p g n d p g n d p w m d i s b # n c c g n d g l v s w h v s w h v s w h v s w h v s w h 4 1 4 2 4 3 4 1 4 2 4 3
3 w w w . f a i r c h i l d s e m i . c o m f d m f 6 7 0 4 r e v . g f d m f 6 7 0 4 t h e x t r a s m a l l , h i g h p e r f o r m a n c e , h i g h f r e q u e n c y d r m o s m o d u l e p i n d e s c r i p t i o n a b s o l u t e m a x i m u m r a t i n g * i o ( a v ) a n d i o ( p e a k ) a r e m e a s u r e d i n f c s e v a l u a t i o n b o a r d . t h e s e r a t i n g s c a n b e c h a n g e d w i t h d i f f e r e n t a p p l i c a t i o n s e t t i n g . r e c o m m e n d e d o p e r a t i n g r a n g e * m a y b e o p e r a t e d a t l o w e r i n p u t v o l t a g e . s e e f i g u r e 1 0 . p i n n a m e f u n c t i o n 1 s m o d # w h e n s m o d # = h i , l o w s i d e d r i v e r i s i n v e r s e o f p w m i n p u t . w h e n s m o d # = l o w , l o w s i d e d r i v e r i s d i s a b l e d . t h i s p i n h a s n o i n t e r n a l p u l l u p o r p u l l d o w n . i t s h o u l d n o t b e l e f t f l o a t i n g . d o n o t a d d n o i s e f i l t e r c a p . 2 v c i n i c b i a s s u p p l y . m i n i m u m 1 f c e r a m i c c a p a c i t o r i s r e c o m m e n d e d f r o m t h i s p i n t o c g n d . 3 v d r v p o w e r f o r l o w s i d e d r i v e r . m i n i m u m 1 f c e r a m i c c a p a c i t o r i s r e c o m m e n d e d t o b e c o n n e c t e d a s c l o s e a s p o s s i b l e f r o m t h i s p i n t o c g n d . 4 b o o t b o o t s t r a p s u p p l y i n p u t . p r o v i d e s v o l t a g e s u p p l y t o h i g h - s i d e m o s f e t d r i v e r . c o n n e c t b o o t s t r a p c a p a c i t o r f r o m t h i s p i n t o p h a s e . 5 , 3 7 , 4 1 c g n d i c g r o u n d . g r o u n d r e t u r n f o r d r i v e r i c . 6 g h f o r m a n u f a c t u r i n g t e s t o n l y . t h i s p i n m u s t b e f l o a t e d . m u s t n o t b e c o n n e c t e d t o a n y p i n . 7 p h a s e s w i t c h n o d e p i n f o r e a s y b o o t s t r a p c a p a c i t o r r o u t i n g . e l e c t r i c a l l y s h o r t e d t o v s w h p i n . 8 , 3 8 n c n o c o n n e c t . 9 - 1 4 , 4 2 v i n p o w e r i n p u t . o u t p u t s t a g e s u p p l y v o l t a g e . 1 5 , 2 9 - 3 5 , 4 3 v s w h s w i t c h n o d e i n p u t . p r o v i d e s r e t u r n f o r h i g h - s i d e b o o t s t r a p p e d d r i v e r a n d a c t s a s a s e n s e p o i n t f o r t h e a d a p t i v e s h o o t - t h r u p r o t e c t i o n . 1 6 - 2 8 p g n d p o w e r g r o u n d . o u t p u t s t a g e g r o u n d . s o u r c e p i n o f l o w s i d e m o s f e t ( s ) . 3 6 g l f o r m a n u f a c t u r i n g t e s t o n l y . t h i s p i n m u s t b e f l o a t e d . m u s t n o t b e c o n n e c t e d t o a n y p i n . 3 9 d i s b # o u t p u t d i s a b l e . w h e n l o w , t h i s p i n d i s a b l e f e t s w i t c h i n g ( g h a n d g l a r e h e l d l o w ) . t h i s p i n h a s n o i n t e r n a l p u l l u p o r p u l l d o w n . i t s h o u l d n o t b e l e f t f l o a t i n g . d o n o t a d d n o i s e f i l t e r c a p . 4 0 p w m p w m s i g n a l i n p u t . t h i s p i n a c c e p t s a t r i - s t a t e l o g i c - l e v e l p w m s i g n a l f r o m t h e c o n t r o l l e r . d o n o t a d d n o i s e f i l t e r c a p . p a r a m e t e r m i n m a x u n i t s v c i n , v d r v , d i s b # , p w m , s m o d # , g l t o c g n d 6 v v i n t o p g n d , c g n d 2 7 v b o o t , g h t o v s w h , p h a s e 6 v b o o t , v s w h , p h a s e , g h t o g n d 2 7 v b o o t t o v d r v 2 2 v i o ( a v ) * v i n = 1 2 v , v o = 1 . 3 v f s w = 3 5 0 k h z 3 5 a f s w = 1 m h z 3 2 a i o ( p e a k ) * 8 0 a r q j p c b j u n c t i o n t o p c b t h e r m a l r e s i s t a n c e 3 . 7 5 c / w o p e r a t i n g a n d s t o r a g e j u n c t i o n t e m p e r a t u r e r a n g e - 5 5 1 5 0 c p a r a m e t e r m i n t y p m a x u n i t s v c i n c o n t r o l c i r c u i t s u p p l y v o l t a g e 4 . 5 5 5 . 5 v v i n o u t p u t s t a g e s u p p l y v o l t a g e 3 * 1 2 1 4 v
4 w w w . f a i r c h i l d s e m i . c o m f d m f 6 7 0 4 r e v . g f d m f 6 7 0 4 t h e x t r a s m a l l , h i g h p e r f o r m a n c e , h i g h f r e q u e n c y d r m o s m o d u l e 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 v i n = 1 2 v , t a = 2 5 c u n l e s s o t h e r w i s e n o t e d . p a r a m e t e r s y m b o l c o n d i t i o n s m i n t y p m a x u n i t s o p e r a t i n g q u i e s c e n t c u r r e n t i q p w m = g n d 2 m a p w m = v c i n 2 v c i n u v l o u v l o t h r e s h o l d 3 . 0 3 . 2 3 . 4 v u v l o c o m p h y s t e r e s i s 0 . 2 v p w m i n p u t s i n k i m p e d a n c e 1 0 k s o u r c e i m p e d a n c e 1 0 k t r i - s t a t e r i s i n g t h r e s h o l d v c i n = 5 v 3 . 2 3 . 4 3 . 6 v h y s t e r e s i s 1 0 0 m v t r i - s t a t e f a l l i n g t h r e s h o l d v c i n = 5 v 1 . 2 1 . 4 1 . 6 v h y s t e r e s i s 1 0 0 m v t r i - s t a t e p i n o p e n 2 . 5 v t r i - s t a t e s h u t o f f t i m e 1 0 0 n s s m o d # a n d d i s b # i n p u t h i g h l e v e l i n p u t v o l t a g e 2 v l o w l e v e l i n p u t v o l t a g e 0 . 8 v i n p u t b i a s c u r r e n t - 2 2 a p r o p a g a t i o n d e l a y t i m e p w m = g n d , d e l a y b e t w e e n s m o d # o r d i s b # f r o m h i t o l o t o g l f r o m h i t o l o . 1 5 n s h i g h s i d e d r i v e r r i s e t i m e 1 0 % t o 9 0 % 2 5 n s f a l l t i m e 9 0 % t o 1 0 % 2 0 n s d e a d b a n d t i m e t d t h h g l g o i n g l o t o g h g o i n g h i , 1 0 % t o 1 0 % 2 5 n s p r o p a g a t i o n d e l a y t p d h l p m w g o i n g l o t o g h g o i n g l o 1 0 n s l o w s i d e d r i v e r r i s e t i m e 1 0 % t o 9 0 % 2 5 n s f a l l t i m e 9 0 % t o 1 0 % 2 0 n s d e a d b a n d t i m e t d t l h v s w h g o i n g l o t o g l g o i n g h i , 1 0 % t o 1 0 % 2 0 n s p r o p a g a t i o n d e l a y t p d l l p w m g o i n g h i t o g l g o i n g l o 1 0 n s 2 5 0 n s t i m e o u t c i r c u i t 2 5 0 n s t i m e d e l a y d e l a y b e t w e e n g h f r o m h i t o l o a n d g l f r o m l o t o h i . 2 5 0 n s
5 w w w . f a i r c h i l d s e m i . c o m f d m f 6 7 0 4 r e v . g f d m f 6 7 0 4 t h e x t r a s m a l l , h i g h p e r f o r m a n c e , h i g h f r e q u e n c y d r m o s m o d u l e d e s c r i p t i o n o f o p e r a t i o n c i r c u i t d e s c r i p t i o n t h e f d m f 6 7 0 4 i s a d r i v e r p l u s f e t m o d u l e o p t i m i z e d f o r s y n c h r o n o u s b u c k c o n v e r t e r t o p o l o g y . a s i n g l e p w m i n p u t s i g n a l i s a l l t h a t i s r e q u i r e d t o p r o p e r l y d r i v e t h e h i g h - s i d e a n d t h e l o w - s i d e m o s f e t s . e a c h p a r t i s c a p a b l e o f d r i v i n g s p e e d s u p t o 1 m h z . p w m w h e n t h e p w m i n p u t g o e s h i g h , t h e h i g h s i d e m o s f e t t u r n s o n . w h e n i t g o e s l o w , t h e l o w s i d e m o s f e t t u r n s o n . w h e n i t i s o p e n , b o t h t h e l o w s i d e a n d h i g h s i d e m o f e t w i l l t u r n o f f . t h e d i s b # i n p u t i s c o m b i n e d w i t h t h e p w m s i g n a l t o c o n t r o l t h e d r i v e r o u t p u t . i n a t y p i c a l m u l t i p h a s e d e s i g n , d i s b # w i l l b e a s h a r e d s i g n a l u s e d t o t u r n o n a l l p h a s e s . t h e i n d i v i d u a l p w m s i g n a l s f r o m t h e c o n t r o l l e r w i l l b e u s e d t o d y n a m i c a l l y e n a b l e o r d i s a b l e i n d i v i d u a l p h a s e s . l o w - s i d e d r i v e r t h e l o w - s i d e d r i v e r ( g l ) i s d e s i g n e d t o d r i v e a g r o u n d r e f e r e n c e d l o w r d s ( o n ) n - c h a n n e l m o s f e t . t h e b i a s f o r g l i s i n t e r n a l l y c o n n e c t e d b e t w e e n v d r v a n d c g n d . w h e n t h e d r i v e r i s e n a b l e d , t h e d r i v e r ' s o u t p u t i s 1 8 0 o u t o f p h a s e w i t h t h e p w m i n p u t . w h e n t h e d r i v e r i s d i s a b l e d ( d i s b # = 0 v ) , g l i s h e l d l o w . h i g h - s i d e d r i v e r t h e h i g h - s i d e d r i v e r ( g h ) i s d e s i g n e d t o d r i v e a f l o a t i n g n - c h a n n e l m o s f e t . t h e b i a s v o l t a g e f o r t h e h i g h - s i d e d r i v e r i s d e v e l o p e d b y a b o o t s t r a p s u p p l y c i r c u i t , c o n s i s t i n g o f t h e i n t e r n a l d i o d e a n d e x t e r n a l b o o t s t r a p c a p a c i t o r ( c b o o t ) . d u r i n g s t a r t - u p , v s w h i s h e l d a t p g n d , a l l o w i n g c b o o t t o c h a r g e t o v d r v t h r o u g h t h e i n t e r n a l d i o d e . w h e n t h e p w m i n p u t g o e s h i g h , g h w i l l b e g i n t o c h a r g e t h e h i g h - s i d e m o s f e t ' s g a t e ( q 1 ) . d u r i n g t h i s t r a n s i t i o n , c h a r g e i s r e m o v e d f r o m c b o o t a n d d e l i v e r e d t o q 1 ' s g a t e . a s q 1 t u r n s o n , v s w h r i s e s t o v i n , f o r c i n g t h e b o o t p i n t o v i n + v c ( b o o t ) , w h i c h p r o v i d e s s u f f i c i e n t v g s e n h a n c e m e n t f o r q 1 . t o c o m p l e t e t h e s w i t c h i n g c y c l e , q 1 i s t u r n e d o f f b y p u l l i n g g h t o v s w h . c b o o t i s t h e n r e c h a r g e d t o v d r v w h e n v s w h f a l l s t o p g n d . g h o u t p u t i s i n p h a s e w i t h t h e p w m i n p u t . w h e n t h e d r i v e r i s d i s a b l e d , t h e h i g h - s i d e g a t e i s h e l d l o w . s m o d t h e s m o d ( s k i p m o d e ) f u n c t i o n a l l o w s f o r h i g h e r c o n v e r t e r e f f i c i e n c y u n d e r l i g h t l o a d c o n d i t i o n s . d u r i n g s m o d , t h e l s f e t i s d i s a b l e d a n d i t p r e v e n t s d i s c h a r g i n g o f o u t p u t c a p s . w h e n t h e s m o d # p i n i s p u l l e d h i g h , t h e s y n c b u c k c o n v e r t e r w i l l w o r k i n s y n c h r o n o u s m o d e . w h e n t h e s m o d # p i n i s p u l l e d l o w , t h e l s f e t i s t u r n e d o f f . t h e s m o d f u n c t i o n d o e s n o t h a v e i n t e r n a l c u r r e n t s e n s i n g . t h i s s m o d # p i n i s c o n n e c t e d t o a p w m c o n t r o l l e r w h i c h e n a b l e s o r d i s a b l e s t h e s m o d a u t o m a t i c a l l y w h e n t h e c o n t r o l l e r d e t e c t s l i g h t l o a d c o n d i t i o n . n o r m a l l y t h i s p i n i s a c t i v e l o w . a d a p t i v e g a t e d r i v e c i r c u i t t h e d r i v e r i c e m b o d i e s a n a d v a n c e d d e s i g n t h a t e n s u r e s m i n i m u m m o s f e t d e a d - t i m e w h i l e e l i m i n a t i n g p o t e n t i a l s h o o t - t h r o u g h ( c r o s s - c o n d u c t i o n ) c u r r e n t s . i t s e n s e s t h e s t a t e o f t h e m o s f e t s a n d a d j u s t s t h e g a t e d r i v e , a d a p t i v e l y , t o e n s u r e t h e y d o n o t c o n d u c t s i m u l t a n e o u s l y . r e f e r t o f i g u r e 4 f o r t h e r e l e v a n t t i m i n g w a v e f o r m s . t o p r e v e n t o v e r l a p d u r i n g t h e l o w - t o - h i g h s w i t c h i n g t r a n s i t i o n ( q 2 o f f t o q 1 o n ) , t h e a d a p t i v e c i r c u i t r y m o n i t o r s t h e v o l t a g e a t t h e g l p i n . w h e n t h e p w m s i g n a l g o e s h i g h , q 2 w i l l b e g i n t o t u r n o f f a f t e r s o m e p r o p a g a t i o n d e l a y ( t p d l l ) . o n c e t h e g l p i n i s d i s c h a r g e d b e l o w 1 v , q 1 b e g i n s t o t u r n o n a f t e r a d a p t i v e d e l a y t d t h h . t o p r e c l u d e o v e r l a p d u r i n g t h e h i g h - t o - l o w t r a n s i t i o n ( q 1 o f f t o q 2 o n ) , t h e a d a p t i v e c i r c u i t r y m o n i t o r s t h e v o l t a g e a t t h e v s w h p i n . w h e n t h e p w m s i g n a l g o e s l o w , q 1 w i l l b e g i n t o t u r n o f f a f t e r s o m e p r o p a g a t i o n d e l a y ( t p d h l ) . o n c e t h e v s w h p i n f a l l s b e l o w 1 v , q 2 b e g i n s t o t u r n o n a f t e r a d a p t i v e d e l a y t d t l h . a d d i t i o n a l l y , v g s o f q 1 i s m o n i t o r e d . w h e n v g s ( q 1 ) i s d i s c h a r g e d l o w , a s e c o n d a r y a d a p t i v e d e l a y i s i n i t i a t e d , w h i c h r e s u l t s i n q 2 b e i n g d r i v e n o n a f t e r 2 5 0 n s , r e g a r d l e s s o f v s w h s t a t e . t h i s f u n c t i o n i s i m p l e m e n t e d t o e n s u r e c b o o t i s r e c h a r g e d e a c h s w i t c h i n g c y c l e , p a r t i c u l a r l y f o r c a s e s w h e r e t h e p o w e r c o n v e r t o r i s s i n k i n g c u r r e n t a n d v s w h v o l t a g e d o e s n o t f a l l b e l o w t h e 1 v a d a p t i v e t h r e s h o l d . t h e 2 5 0 n s s e c o n d a r y d e l a y i s l o n g e r t h a n t d t l h .
6 w w w . f a i r c h i l d s e m i . c o m f d m f 6 7 0 4 r e v . g f d m f 6 7 0 4 t h e x t r a s m a l l , h i g h p e r f o r m a n c e , h i g h f r e q u e n c y d r m o s m o d u l e s w i t c h n o d e r i n g i n g s u p p r e s s i o n f a i r c h i l d ' s d r m o s p r o d u c t s h a v e p r o p r i e t a r y f e a t u r e * t h a t m i n i m i z e s t h e p e a k o v e r s h o o t a n d r i n g i n g v o l t a g e o n t h e s w i t c h n o d e ( v s w h ) o u t p u t , w i t h o u t t h e n e e d o f e x t e r n a l s n u b b e r s . t h e f o l l o w i n g p i c t u r e s s h o w t h e w a v e f o r m s o f a n f d m f 6 7 0 4 d r m o s p a r t a n d a c o m p e t i t o r ' s p a r t t e s t e d w i t h o u t s n u b b i n g . t h e t e s t s w e r e d o n e i n t h e s a m e t e s t c i r c u i t , u n d e r t h e s a m e o p e r a t i n g c o n d i t i o n s . * p a t e n t p e n d i n g f i g u r e 4 . t i m i n g d i a g r a m p w m t p d l l g h t o v s w h t d t l h g l v s w h t p d h l t i m e o u t t d t h h t r i - s t a t e s h u t o f f f i g u r e 5 . f d m f 6 7 0 4 f i g u r e 6 . c o m p e t i t o r p a r t
7 w w w . f a i r c h i l d s e m i . c o m f d m f 6 7 0 4 r e v . g f d m f 6 7 0 4 t h e x t r a s m a l l , h i g h p e r f o r m a n c e , h i g h f r e q u e n c y d r m o s m o d u l e t y p i c a l c h a r a c t e r i s t i c s v i n = 1 2 v , v c i n = 5 v , t a = 2 5 c u n l e s s o t h e r w i s e n o t e d . f i g u r e 9 . p o w e r l o s s v s . s w i t c h i n g f r e q u e n c y f i g u r e 1 0 . p o w e r l o s s v s . i n p u t v o l t a g e f i g u r e 1 1 . p o w e r l o s s v s . d r i v e r s u p p l y v o l t a g e f i g u r e 1 2 . p o w e r l o s s v s . o u t p u t v o l t a g e f i g u r e 7 . s a f e o p e r a t i n g a r e a f i g u r e 8 . m o d u l e p o w e r l o s s v s . o u t p u t c u r r e n t 0 5 1 0 1 5 2 0 2 5 3 0 3 5 0 2 5 5 0 7 5 1 0 0 1 2 5 1 5 0 p c b t e m p e r a t u r e , o c i l o a d , a v i n = 1 2 v v o u t = 1 . 3 v f s w = 1 m h z l = 4 4 0 n h 0 2 4 6 8 1 0 1 2 0 5 1 0 1 5 2 0 2 5 3 0 3 5 i l o a d , a p l o s s , w f s w = 1 m h z f s w = 3 5 0 k h z v i n = 1 2 v v o u t = 1 . 3 v l = 4 4 0 n h 0 . 9 8 1 . 0 0 1 . 0 2 1 . 0 4 1 . 0 6 1 . 0 8 1 . 1 0 1 . 1 2 1 . 1 4 1 . 1 6 6 8 1 0 1 2 1 4 1 6 i n p u t v o l t a g e , v p l o s s ( n o r m a l i z e d ) v o u t = 1 . 3 v i o u t = 3 0 a l = 4 4 0 n h f s w = 3 5 0 k h z 0 . 8 0 0 . 9 0 1 . 0 0 1 . 1 0 1 . 2 0 1 . 3 0 1 . 4 0 0 . 8 1 . 1 1 . 4 1 . 7 2 . 0 2 . 3 2 . 6 2 . 9 3 . 2 o u t p u t v o l t a g e , v p l o s s ( n o r m a l i z e d ) v i n = 1 2 v i o u t = 3 0 a l = 4 4 0 n h f s w = 3 5 0 k h z 0 . 8 9 0 . 9 2 0 . 9 5 0 . 9 8 1 . 0 1 1 . 0 4 1 . 0 7 1 . 1 0 4 . 5 4 . 8 5 . 1 5 . 4 5 . 7 6 . 0 d r i v e r s u p p l y v o l t a g e , v p l o s s ( n o r m a l i z e d ) v i n = 1 2 v v o u t = 1 . 3 v i o u t = 3 0 a l = 4 4 0 n h f s w = 3 5 0 k h z 0 . 8 0 0 . 9 0 1 . 0 0 1 . 1 0 1 . 2 0 1 . 3 0 1 . 4 0 2 0 0 3 0 0 4 0 0 5 0 0 6 0 0 7 0 0 8 0 0 9 0 0 1 0 0 0 f s w , k h z p l o s s ( n o r m a l i z e d ) v i n = 1 2 v v o u t = 1 . 3 v i o u t = 3 0 a l = 4 4 0 n h
8 w w w . f a i r c h i l d s e m i . c o m f d m f 6 7 0 4 r e v . g f d m f 6 7 0 4 t h e x t r a s m a l l , h i g h p e r f o r m a n c e , h i g h f r e q u e n c y d r m o s m o d u l e t y p i c a l c h a r a c t e r i s t i c s v i n = 1 2 v , v c i n = 5 v , t a = 2 5 c u n l e s s o t h e r w i s e n o t e d . f i g u r e 1 5 . d r i v e r s u p p l y c u r r e n t v s . d r i v e s u p p l y v o l t a g e f i g u r e 1 8 . p w m t r i - s t a t e t h r e s h o l d v o l t a g e v s . t e m p e r a t u r e f i g u r e 1 7 . p w m t r i - s t a t e t h r e s h o l d v o l t a g e v s . d r i v e r s u p p l y v o l t a g e f i g u r e 1 3 . p o w e r l o s s v s . o u t p u t i n d u c t a n c e f i g u r e 1 4 . d r i v e r s u p p l y c u r r e n t v s . f r e q u e n c y 0 . 9 9 5 1 . 0 0 0 1 . 0 0 5 1 . 0 1 0 1 . 0 1 5 1 . 0 2 0 1 . 0 2 5 1 . 0 3 0 1 . 0 3 5 1 . 0 4 0 1 . 0 4 5 2 2 0 2 7 5 3 3 0 3 8 5 4 4 0 o u t p u t i n d u c t a n c e , n h p l o s s ( n o r m a l i z e d ) v i n = 1 2 v v o u t = 1 . 3 v i o u t = 3 0 a f s w = 3 5 0 k h z 0 5 1 0 1 5 2 0 2 5 3 0 3 5 4 0 4 5 2 0 0 3 0 0 4 0 0 5 0 0 6 0 0 7 0 0 8 0 0 9 0 0 1 0 0 0 f s w , k h z d r i v e r s u p p l y c u r r e n t , m a v c i n = 5 v 3 0 3 5 4 0 4 5 5 0 5 5 6 0 4 . 5 4 . 8 5 . 0 5 . 3 5 . 5 5 . 8 6 . 0 d r i v e r s u p p l y v o l t a g e , v d r i v e r s u p p l y c u r r e n t , m a f s w = 1 m h z 4 0 4 1 4 2 4 3 4 4 4 5 4 6 4 7 4 8 4 9 5 0 - 5 0 - 2 5 0 2 5 5 0 7 5 1 0 0 1 2 5 1 5 0 t e m p e r a t u r e , o c d r i v e r s u p p l y c u r r e n t , m a v c i n = 5 v f s w = 1 m h z f i g u r e 1 6 . d r i v e r s u p p l y c u r r e n t v s . t e m p e r a t u r e 0 . 0 0 . 5 1 . 0 1 . 5 2 . 0 2 . 5 3 . 0 3 . 5 4 . 0 4 . 5 5 . 0 4 . 5 5 . 0 5 . 5 6 . 0 d r i v e r s u p p l y v o l t a g e , v p w m t r i - s t a t e t h r e s h o l d v o l t a g e , v o n s t a t e o f f s t a t e t r i s t a t e 0 . 0 0 . 5 1 . 0 1 . 5 2 . 0 2 . 5 3 . 0 3 . 5 4 . 0 4 . 5 5 . 0 - 4 0 2 5 8 5 1 2 5 1 5 0 t e m p e r a t u r e , o c p w m t r i - s t a t e t h r e s h o l d v o l t a g e , v o n s t a t e o f f s t a t e t r i s t a t e v c i n = 5 v
9 w w w . f a i r c h i l d s e m i . c o m f d m f 6 7 0 4 r e v . g f d m f 6 7 0 4 t h e x t r a s m a l l , h i g h p e r f o r m a n c e , h i g h f r e q u e n c y d r m o s m o d u l e t y p i c a l c h a r a c t e r i s t i c s v i n = 1 2 v , v c i n = 5 v , t a = 2 5 c u n l e s s o t h e r w i s e n o t e d . f i g u r e 2 1 . d i s b # t h r e s h o l d v o l t a g e v s . d r i v e r s u p p l y v o l t a g e f i g u r e 1 9 . s m o d # t h r e s h o l d v o l t a g e v s . d r i v e r s u p p l y v o l t a g e f i g u r e 2 0 . s m o d # t h r e s h o l d v o l t a g e v s . t e m p e r a t u r e f i g u r e 2 2 . d i s b # t h r e s h o l d v o l t a g e v s . t e m p e r a t u r e 1 . 0 1 . 2 1 . 4 1 . 6 1 . 8 2 . 0 2 . 2 4 . 5 4 . 8 5 . 0 5 . 3 5 . 5 5 . 8 6 . 0 d r i v e r s u p p l y v o l t a g e , v s m o d # t h r e s h o l d v o l t a g e , v v i h v i l 1 . 0 1 . 2 1 . 4 1 . 6 1 . 8 2 . 0 2 . 2 - 5 0 - 2 5 0 2 5 5 0 7 5 1 0 0 1 2 5 1 5 0 t e m p e r a t u r e , o c s m o d # t h r e s h o l d v o l t a g e , v v i h v i l v c i n = 5 v 1 . 0 1 . 2 1 . 4 1 . 6 1 . 8 2 . 0 2 . 2 4 . 5 4 . 8 5 . 0 5 . 3 5 . 5 5 . 8 6 . 0 d r i v e r s u p p l y v o l t a g e , v d i s b # t h r e s h o l d v o l t a g e , v v i h v i l 1 . 0 1 . 2 1 . 4 1 . 6 1 . 8 2 . 0 2 . 2 - 5 0 - 2 5 0 2 5 5 0 7 5 1 0 0 1 2 5 1 5 0 t e m p e r a t u r e , o c d i s b # t h r e s h o l d v o l t a g e , v v i h v i l v c i n = 5 v
1 0 w w w . f a i r c h i l d s e m i . c o m f d m f 6 7 0 4 r e v . g f d m f 6 7 0 4 t h e x t r a s m a l l , h i g h p e r f o r m a n c e , h i g h f r e q u e n c y d r m o s m o d u l e s u p p l y c a p a c i t o r s e l e c t i o n f o r t h e s u p p l y i n p u t ( v c i n ) o f t h e f d m f 6 7 0 4 , a l o c a l c e r a m i c b y p a s s c a p a c i t o r i s r e c o m m e n d e d t o r e d u c e t h e n o i s e a n d t o s u p p l y t h e p e a k c u r r e n t . u s e a t l e a s t a 1 f , x 7 r o r x 5 r c a p a c i t o r . k e e p t h i s c a p a c i t o r c l o s e t o t h e f d m f 6 7 0 4 v c i n a n d p g n d p i n s . b o o t s t r a p c i r c u i t t h e b o o t s t r a p c i r c u i t u s e s a c h a r g e s t o r a g e c a p a c i t o r ( c b o o t ) , a s s h o w n i n f i g u r e 2 3 . a b o o t s t r a p c a p a c i t a n c e o f 1 0 0 n f , x 7 r o r x 5 r c a p a c i t o r i s a d e q u a t e . a s e r i e s b o o t s t r a p r e s i s t o r w o u l d b e n e e d e d f o r s p e c i f i c a p p l i c a t i o n i n o r d e r t o i m p r o v e s w i t c h i n g n o i s e i m m u n i t y v c i n f i l t e r t h e v d r v p i n p r o v i d e s p o w e r t o t h e g a t e d r i v e o f t h e h i g h s i d e a n d l o w s i d e p o w e r f e t . i n m o s t c a s e s , i t c a n b e c o n n e c t e d d i r e c t l y t o v c i n , t h e p i n t h a t p r o v i d e s p o w e r t o t h e l o g i c s e c t i o n o f t h e d r i v e r . f o r a d d i t i o n a l n o i s e i m m u n i t y , a n r c f i l t e r c a n b e i n s e r t e d b e t w e e n v d r v a n d v c i n . r e c o m m e n d e d v a l u e s w o u l d b e 1 0 o h m s a n d 1 f . v 5 v 5 v s i g n a l v i n 1 2 v p w m 3 v c c p w m 1 p w m 2 c g n d p w m c o n t r o l l e r e n p w m 4 g n d p o w e r g n d v o u t t y p i c a l a p p l i c a t i o n f i g u r e 2 3 . t y p i c a l a p p l i c a t i o n s m o d # f d m f 6 7 0 4 d i s b # p w m c g n d p g n d v c i n v i n b o o t v s w h c b o o t v d r v s m o d # p h a s e f d m f 6 7 0 4 d i s b # p w m c g n d p g n d v c i n v i n b o o t v s w h c b o o t v d r v s m o d # p h a s e f d m f 6 7 0 4 d i s b # p w m c g n d p g n d v c i n v i n b o o t v s w h c b o o t v d r v s m o d # p h a s e f d m f 6 7 0 4 d i s b # p w m c g n d p g n d v c i n v i n b o o t v s w h c b o o t v d r v s m o d # p h a s e a p p l i c a t i o n i n f o r m a t i o n r b o o t r b o o t r b o o t r b o o t
1 1 w w w . f a i r c h i l d s e m i . c o m f d m f 6 7 0 4 r e v . g f d m f 6 7 0 4 t h e x t r a s m a l l , h i g h p e r f o r m a n c e , h i g h f r e q u e n c y d r m o s m o d u l e p o w e r l o s s a n d e f f i c i e n c y m e a s u r e m e n t a n d c a l c u l a t i o n r e f e r t o f i g u r e 2 4 f o r p o w e r l o s s t e s t i n g m e t h o d . p o w e r l o s s c a l c u l a t i o n a r e a s f o l l o w s : ( a ) p i n = ( v i n x i i n ) + ( v 5 v x i 5 v ) ( w ) ( b ) p s w = v s w x i o u t ( w ) ( c ) p o u t = v o u t x i o u t ( w ) ( d ) p l o s s _ m o d u l e = p i n - p s w ( w ) ( e ) p l o s s _ b o a r d = p i n - p o u t ( w ) ( f ) e f f m o d u l e = 1 0 0 x p s w / p i n ( % ) ( g ) e f f b o a r d = 1 0 0 x p o u t / p i n ( % ) p c b l a y o u t g u i d e l i n e f i g u r e 2 5 s h o w s a p r o p e r l a y o u t e x a m p l e o f f d m f 6 7 0 4 a n d c r i t i c a l p a r t s . a l l o f h i g h c u r r e n t f l o w p a t h , s u c h a s v i n , v s w h , v o u t a n d g n d c o p p e r , s h o u l d b e s h o r t a n d w i d e f o r b e t t e r a n d s t a b l e c u r r e n t f l o w , h e a t r a d i a t i o n a n d s y s t e m p e r f o r m a n c e . f o l l o w i n g i s a g u i d e l i n e w h i c h t h e p c b d e s i g n e r s h o u l d c o n s i d e r : 1 . i n p u t c e r a m i c b y p a s s c a p a c i t o r s m u s t b e c l o s e t o v i n a n d p g n d p i n o f f d m f 6 7 0 4 t o h e l p r e d u c e t h e i n p u t c u r r e n t r i p p l e c o m p o n e n t i n d u c e d b y s w i t c h i n g o p e r a t i o n . 2 . t h e v s w h c o p p e r t r a c e s e r v e s t w o p u r p o s e s . i n a d d i t i o n t o b e i n g t h e h i g h f r e q u e n c y c u r r e n t p a t h f r o m t h e d r m o s p a c k a g e t o t h e o u t p u t i n d u c t o r , i t a l s o s e r v e s a s h e a t s i n k f o r t h e l o w e r f e t i n t h e d r m o s p a c k a g e . t h e t r a c e s h o u l d b e s h o r t a n d w i d e e n o u g h t o p r e s e n t a l o w i m p e d a n c e p a t h f o r t h e h i g h f r e q u e n c y , h i g h c u r r e n t f l o w b e t w e e n t h e d r m o s a n d i n d u c t o r i n o r d e r t o m i n i m i z e l o s s e s a n d t e m p e r a t u r e r i s e . p l e a s e n o t e t h a t t h e v s w h n o d e i s a h i g h v o l t a g e a n d h i g h f r e q u e n c y s w i t c h i n g n o d e w i t h h i g h n o i s e p o t e n t i a l . c a r e s h o u l d b e t a k e n t o m i n i m i z e c o u p l i n g t o a d j a c e n t t r a c e s . a d d i t i o n a l l y , s i n c e t h i s c o p p e r t r a c e a l s o a c t s a s h e a t s i n k f o r t h e l o w e r f e t , t r a d e o f f m u s t b e m a d e t o u s e t h e l a r g e s t a r e a p o s s i b l e t o i m p r o v e d r m o s c o o l i n g w h i l e m a i n t a i n i n g a c c e p t a b l e n o i s e e m i s s i o n . 3 . o u t p u t i n d u c t o r l o c a t i o n s h o u l d b e a s c l o s e a s p o s s i b l e t o t h e f d m f 6 7 0 4 f o r l o w e r p o w e r l o s s d u e t o c o p p e r t r a c e . c a r e s h o u l d b e t a k e n s o t h a t i n d u c t o r d i s s i p a t i o n d o e s n o t h e a t t h e d r m o s . 4 . t h e p o w e r t r e n c h ? 5 m o s f e t s u s e d i n t h e o u t p u t s t a g e a r e v e r y e f f e c t i v e a t m i n i m i z i n g r i n g i n g . i n m o s t c a s e s , n o s n u b b e r w i l l b e r e q u i r e d . i f a s n u b b e r i s u s e d , i t s h o u l d b e p l a c e d n e a r t h e f d m f 6 7 0 4 . t h e r e s i s t o r a n d c a p a c i t o r n e e d t o b e o f p r o p e r s i z e f o r t h e p o w e r d i s s i p a t i o n . 5 . p l a c e c e r a m i c b y p a s s c a p a c i t o r a n d b o o t c a p a c i t o r a s c l o s e a s p o s s i b l e t o t h e v c i n a n d b o o t p i n s o f t h e f d m f 6 7 0 4 t o e n s u r e c l e a n a n d s t a b l e p o w e r . r o u t i n g w i d t h a n d l e n g t h s h o u l d b e c o n s i d e r e d a s w e l l . 6 . i n c l u d e a t r a c e f r o m p h a s e t o v s w h i n o r d e r t o i m p r o v e n o i s e m a r g i n . k e e p t r a c e a s s h o r t a s p o s s i b l e . 7 . t h e l a y o u t s h o u l d i n c l u d e t h e o p t i o n t o i n s e r t a s m a l l v a l u e s e r i e s b o o t r e s i s t o r b e t w e e n b o o t c a p a n d b o o t p i n . t h e b o o t l o o p s i z e , i n c l u d i n g r b o o t a n d c b o o t , s h o u l d b e a s s m a l l a s p o s s i b l e . t h e b o o t r e s i s t o r i s n o r m a l l y n o t r e q u i r e d , b u t i s e f f e c t i v e a t i m p r o v i n g n o i s e o p e r a t i n g m a r g i n i n m u l t i p h a s e d e s i g n s t h a t m a y h a v e n o i s e i s s u e s d u e t o g r o u n d b o u n c e a n d h i g h n e g a t i v e v s w h r i n g i n g . t h e v i n a n d p g n d p i n s h a n d l e l a r g e c u r r e n t t r a n s i e n t s w i t h f r e q u e n c y c o m p o n e n t s a b o v e 1 0 0 m h z . i f p o s s i b l e , t h e s e p a c k a g e p i n 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 t h e v i n a n d b o a r d g n d p l a n e s . t h e u s e o f t h e r m a l r e l i e f t r a c e s i n s e r i e s w i t h t h e s e p i n s i s d i s c o u r a g e d s i n c e t h i s w i l l a d d i n d u c t a n c e t o t h e p o w e r p a t h . t h i s a d d e d i n d u c t a n c e i n s e r i e s w i t h t h e p g n d p i n w i l l d e g r a d e s y s t e m n o i s e i m m u n i t y b y i n c r e a s i n g n e g a t i v e v s w h r i n g i n g . 8 . c g n d p a d a n d p g n d p i n s s h o u l d b e c o n n e c t e d b y p l a n e g n d c o p p e r w i t h m u l t i p l e v i a s f o r s t a b l e g r o u n d i n g . p o o r g r o u n d i n g c a n c r e a t e a n o i s e t r a n s i e n t o f f s e t v o l t a g e l e v e l b e t w e e n c g n d a n d p g n d . t h i s c o u l d l e a d t o f a u l t o p e r a t i o n o f g a t e d r i v e r a n d m o s f e t . 9 . r i n g i n g a t t h e b o o t p i n i s m o s t e f f e c t i v e l y c o n t r o l l e d b y c l o s e p l a c e m e n t o f t h e b o o t c a p a c i t o r . d o n o t a d d a n a d d i t i o n a l b o o t t o p g n d c a p a c i t o r . t h i s m a y l e a d t o e x c e s s c u r r e n t f l o w t h r o u g h t h e b o o t d i o d e . 1 0 . s m o d # , d i s b # a n d p w m p i n s d o n t h a v e i n t e r n a l p u l l u p o r p u l l d o w n r e s i s t o r s . t h e y s h o u l d n o t b e l e f t f l o a t i n g . t h e s e p i n s s h o u l d n o t h a v e a n y n o i s e f i l t e r c a p s . 1 1 . u s e m u l t i p l e v i a s o n e a c h c o p p e r a r e a t o i n t e r c o n n e c t t o p , i n n e r a n d b o t t o m l a y e r s t o h e l p s m o o t h c u r r e n t f l o w a n d h e a t c o n d u c t i o n . v i a s s h o u l d b e r e l a t i v e l y l a r g e a n d o f r e a s o n a b l e i n d u c t a n c e . c r i t i c a l h i g h f r e q u e n c y c o m p o n e n t s s u c h a s r b o o t , c b o o t , t h e r c s n u b b e r a n d b y p a s s c a p s s h o u l d b e l o c a t e d c l o s e t o t h e d r m o s m o d u l e a n d o n t h e s a m e s i d e o f t h e p c b a s t h e m o d u l e . i f n o t f e a s i b l e , t h e y s h o u l d b e c o n n e c t e d f r o m t h e b a c k s i d e v i a a n e t w o r k o f l o w i n d u c t a n c e v i a s . f i g u r e 2 4 . p o w e r l o s s m e a s u r e m e n t b l o c k d i a g r a m d i s b # p w m c g n d p g n d v c i n v i n b o o t v s w h d i s b # p w m i n p u t c v i n c b o o t c o u t v 5 v c v d r v v d r v s m o d # p h a s e a i 5 v a v i n i i n a v o u t i o u t v v s w s m o d # l o u t r b o o t
1 2 w w w . f a i r c h i l d s e m i . c o m f d m f 6 7 0 4 r e v . g f d m f 6 7 0 4 t h e x t r a s m a l l , h i g h p e r f o r m a n c e , h i g h f r e q u e n c y d r m o s m o d u l e f i g u r e 2 5 . t y p i c a l p c b l a y o u t e x a m p l e t o p v i e w b o t t o m v i e w
1 3 w w w . f a i r c h i l d s e m i . c o m f d m f 6 7 0 4 r e v . g f d m f 6 7 0 4 t h e x t r a s m a l l , h i g h p e r f o r m a n c e , h i g h f r e q u e n c y d r m o s m o d u l e d i m e n s i o n a l o u t l i n e a n d p a d l a y o u t
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-6 supersot ? -8 supremos? syncfet? sync-lock? ? * the power franchise ? tinyboost ? tinybuck ? tinycalc ? tinylogic ? tinyopto ? tinypower ? tinypwm ? tinywire ? trifault detect ? truecurrent ? * serdes ? uhc ? ultra frfet ? unifet ? vcx ? visualmax ? xs? * trademarks of system general corporation, used under license by fairchild semiconductor. disclaimer fairchild semiconductor reserves the right to make changes without further notice to any products herein to improve reliability, function, or design. fairchild does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights, nor the rights of others. these specifications do not expand the terms of fairchild?s worldwide terms and conditions, specifically the warranty therein, which covers these products. life support policy fairchild?s products are not authorized for use as critical co mponents in life support devices or systems without the express written approval of fairchild semiconductor corporation. as used herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provi ded in the labeling, can be reasonably expected to result in a significant injury of the user. 2. a critical component in any component of a life support, device, or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. anti-counterfeiting policy fairchild semiconductor corporation's anti-counterfeiting policy. fairchild's anti-counterfeiting policy is also stated on our external website, www.fairchildsemi.com, under sales support. counterfeiting of semiconductor parts is a growing problem in t he industry. all manufacturers of semiconductor products are exp eriencing counterfeiting of their parts. customers who inadvertently purchase counter feit parts experience many problems such as loss of brand reputation, substandard p erformance, failed applications, and increased cost of production and manufacturing delays. fairchild is taking strong measures to protect ourselves and our cus tomers from the proliferation of counterfeit parts. fairchild strongly encourages customers to purchase fairchild parts eit her directly from fairchild or from a uthorized fairchild distributors who are listed by country on our web page cited above. products customers buy either from fairchild directly or from authorized fairchi ld distributors are genuine parts, have full traceability, meet fairch ild's quality standards for handling and storage and pr ovide access to fair child's full range of up-to-date technical and product information. fairchild and our authorized distributors will stand behind all warranties and will appropr iately address any warranty issues t hat may arise. fairchild will not provide any warranty coverage or other assistance for parts bought from u nauthorized sources. fairchild is committed to combat this glo bal problem and encourage our customers to do their part in stopping this practice by buying direct or from authorized distributors. product status definitions definition of terms datasheet identification product status definition advance information formative / in design datasheet contains the design s pecifications for product developmen t. specifications may change in any manner without notice. preliminary first production datasheet contains preliminary data; supplementary data will be published at a later date. fairchild semiconductor reserves the right to make changes at any time without notice to improve design. no identification needed full production datasheet contains final specific ations. fairchild semiconductor rese rves the right to make changes at any time without notice to improve the design. obsolete not in production datasheet contains specificati ons on a product that is disconti nued by fairchild semiconductor. the datasheet is for reference information only. rev. i41
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