1 UM9926 n-ch 20v fast switching mosfets id 20v 38m 6.5a the UM9926 is the highest performance trench n-ch mosfets with extreme high cell density , which provide excellent rdson and gate charge for most of the synchronous buck converter applications . the UM9926 meet the rohs and green product requirement , 100% eas guaranteed with full function reliability approved. z advanced high cell density trench technology z super low gate charge z excellent cdv/dt effect decline z 100% eas guaranteed z green device available general description features applications z high frequency point-of-load synchronous buck converter for mb/nb/umpc/vga z networking dc-dc power system z load switch absolute maximum ratings thermal data sop8 pin configuration product summery bv dss r ds(on) s o - 8 1 1 2 3 4 8 7 6 5 s 1 g 1 s 2 g 2 d 1 d 1 d 2 d 2 p a r a m e t e r s y m b o l l i m i t u n i t d r a i n - s o u r c e v o l t a g e v d s v g a t e - s o u r c e v o l t a g e v g s 1 0 v d r a i n c u r r e n t - c o n t i n u o u s @ t j = 2 5 c - p u l s e d i d 6 . 5 3 0 1 . 7 2 a a a w i d m d r a i n - s o u r c e d i o d e f o r w a r d c u r r e n t i s m a x i m u m p o w e r d i s s i p a t i o n p d o p e r a t i n g j u n c t i o n a n d s t o r a g e t e m p e r a t u r e r a n g e t j , t s t g - 5 5 t o 1 5 0 c a a a b 2 0 t h e r m a l r e s i s t a n c e , j u n c t i o n - t o - a m b i e n t r j a 6 2 . 5 / w c a
2 electrical characteristics (t j =25 , unless otherwise noted) p a r a m e t e r s y m b o l c o n d i t i o n m i n t y p m a x u n i t o f f c h a r a c t e r i s t i c s d r a i n - s o u r c e b r e a k d o w n v o l t a g e b v d s s = v g s 0 v , i d 2 5 0 u a = 2 0 v z e r o g a t e v o l t a g e d r a i n c u r r e n t i d s s v d s 1 6 v , v g s 0 v = = 1 u a g a t e - b o d y l e a k a g e i g s s v g s 1 0 v , v d s 0 v = = 1 0 u a o n c h a r a c t e r i s t i c s b g a t e t h r e s h o l d v o l t a g e v g s ( t h ) v d s v g s , i d = 2 5 0 u a = 0 . 5 v d r a i n - s o u r c e o n - s t a t e r e s i s t a n c e r d s ( o n ) c m o h m v g s 4 . 0 v , i d 6 . 5 a = = 2 8 1 6 s f o r w a r d t r a n s c o n d u c t a n c e f s g v d s 5 . 0 v , i d 6 . 5 a d y n a m i c c h a r a c t e r i s t i c s c i n p u t c a p a c i t a n c e c i s s c r s s c o s s o u t p u t c a p a c i t a n c e r e v e r s e t r a n s f e r c a p a c i t a n c e v d s = 8 v , v g s = 0 v f = 1 . 0 m h z p f p f p f s w i t c h i n g c h a r a c t e r i s t i c s c t u r n - o n d e l a y t i m e r i s e t i m e t u r n - o f f d e l a y t i m e t d ( o n ) t r t d ( o f f ) t f v d d = 1 0 v , i d = 1 a , v g e n = 4 . 5 v , r l = 1 0 o h m r g e n = 1 0 o h m n s n s n s n s 2 0 3 6 1 1 f a l l t i m e = = 1 0 0 5 4 0 1 6 0 1 5 v g s 2 . 5 v , i d 5 a = = m o h m 3 8 t o t a l g a t e c h a r g e g a t e - s o u r c e c h a r g e g a t e - d r a i n c h a r g e q g q g s q g d v d s = 1 0 v , i d = 6 . 5 a v g s = 4 v n c n c n c v d s = 1 0 v , i d = 6 . 5 a , v g s = 4 v n c v d s = 1 0 v , i d = 6 . 5 a , v g s = 2 . 5 v 6 . 4 2 . 8 1 . 1 4 . 6 0 . 9 3 0 1 . 5 2 3 UM9926 n-ch 20v fast switching mosfets p a r a m e t e r s y m b o l c o n d i t i o n m i n t y p m a x u n i t d r a i n - s o u r c e d i o d e c h a r a c t e r i s t i c s d i o d e f o r w a r d v o l t a g e v s d v g s = 0 v , i s = 1 . 7 a 0 . 7 2 1 . 2 v b c n o t e s c . g u a r a n t e e d b y d e s i g n , n o t s u b j e c t t o p r o d u c t i o n t e s t i n g . b . p u l s e t e s t : p u l s e w i d t h 3 0 0 u s , d u t y c y c l e 2 % . a . s u r f a c e m o u n t e d o n f r 4 b o a r d , t 1 0 s e c . p a r a m e t e r s y m b o l c o n d i t i o n m i n t y p m a x u n i t d r a i n - s o u r c e d i o d e c h a r a c t e r i s t i c s d i o d e f o r w a r d v o l t a g e v s d v g s = 0 v , i s = 1 . 7 a 0 . 7 2 1 . 2 v b c n o t e s c . g u a r a n t e e d b y d e s i g n , n o t s u b j e c t t o p r o d u c t i o n t e s t i n g . b . p u l s e t e s t : p u l s e w i d t h 3 0 0 u s , d u t y c y c l e 2 % . a . s u r f a c e m o u n t e d o n f r 4 b o a r d , t 1 0 s e c .
3 typical characteristics UM9926 n-ch 20v fast switching mosfets f i g u r e 1 . o u t p u t c h a r a c t e r i s t i c s f i g u r e 2 . t r a n s f e r c h a r a c t e r i s t i c s v g s , g a t e - t o - s o u r c e v o l t a g e ( v ) v d s , d r a i n - t o - s o u r c e v o l t a g e ( v ) i d , d r a i n c u r r e n t ( a ) i d , d r a i n c u r r e n t ( a ) 2 0 1 6 1 2 8 4 0 0 0 . 5 1 . 0 1 . 5 2 . 0 2 . 5 3 . 0 - 5 5 c 2 5 c 1 5 1 2 9 6 3 0 0 . 0 0 . 4 0 . 8 1 . 2 1 . 6 2 . 0 2 . 4 t j = 1 2 5 c v g s = 2 v v g s = 3 v v g s = 1 . 5 v v g s = 8 v i d , d r a i n c u r r e n t ( a ) r d s ( o n ) ( m w ) 6 0 5 0 4 0 3 0 2 0 1 0 1 f i g u r e 3 . o n - r e s i s t a n c e v s . d r a i n c u r r e n t a n d g a t e v o l t a g e 4 8 1 2 1 6 2 0 1 v g s = 2 . 5 v v g s = 4 v f i g u r e 4 . o n - r e s i s t a n c e v a r i a t i o n w i t h d r a i n c u r r e n t a n d t e m p e r a t u r e o n - r e s i s t a n c e r d s ( o n ) , n o r m a l i z e d 1 . 5 1 . 4 1 . 3 1 . 2 1 . 1 1 . 0 0 0 1 0 0 t j ( c ) 7 5 2 5 5 0 t j , j u n c t i o n t e m p e r a t u r e ( c ) v g s = 2 . 5 v i d = 5 a 1 2 5 v g s = 4 v i d = 6 . 5 a 1 5 0 v g s = 2 . 5 v f i g u r e 6 . b r e a k d o w n v o l t a g e v a r i a t i o n w i t h t e m p e r a t u r e v t h , n o r m a l i z e d g a t e - s o u r c e t h r e s h o l d v o l t a g e b v d s s , n o r m a l i z e d d r a i n - s o u r c e b r e a k d o w n v o l t a g e i s , s o u r c e - d r a i n c u r r e n t ( a ) f i g u r e 8 . b o d y d i o d e f o r w a r d v o l t a g e v a r i a t i o n w i t h s o u r c e c u r r e n t v s d , b o d y d i o d e f o r w a r d v o l t a g e ( v ) t j , j u n c t i o n t e m p e r a t u r e ( c ) t j , j u n c t i o n t e m p e r a t u r e ( c ) 2 0 . 0 1 0 . 0 1 . 0 0 0 . 3 0 . 6 0 . 9 1 . 2 1 . 5 1 . 4 1 . 2 1 . 0 0 . 8 0 . 6 0 . 4 0 . 2 0 . 0 - 5 0 - 2 5 0 2 5 5 0 7 5 1 0 0 1 2 5 1 5 0 v d s = v g s i d = 2 5 0 u a - 5 0 - 2 5 0 2 5 5 0 7 5 1 0 0 1 2 5 1 5 0 1 . 2 0 1 . 1 5 1 . 1 0 1 . 0 5 1 . 0 0 0 . 9 5 0 . 9 0 i d = 2 5 0 u a v g s , g a t e - s o u r c e v o l t a g e ( v ) r d s ( o n ) ( m w ) 6 0 5 0 4 0 3 0 2 0 1 0 0 f i g u r e 7 . o n - r e s i s t a n c e v s . g a t e - s o u r c e v o l t a g e 1 2 4 6 8 0 f i g u r e 5 . g a t e t h r e s h o l d v a r i a t i o n w i t h t e m p e r a t u r e 2 5 c 1 2 5 c 7 5 c 2 5 c 7 5 c 1 2 5 c i d = 6 . 5 a 5 . 0
4 UM9926 n-ch 20v fast switching mosfets 6 v g s , g a t e t o s o u r c e v o l t a g e ( v ) f i g u r e 1 0 . g a t e c h a r g e q g , t o t a l g a t e c h a r g e ( n c ) 5 4 3 2 1 0 0 1 2 3 4 5 6 7 8 v d s = 1 0 v i d = 6 . 5 a f i g u r e 1 1 . s w i t c h i n g c h a r a c t e r i s t i c s r g , g a t e r e s i s t a n c e ( w ) s w i t c h i n g t i m e ( n s ) f i g u r e 1 2 . m a x i m u m s a f e o p e r a t i n g a r e a v d s , d r a i n - s o u r c e v o l t a g e ( v ) i d , d r a i n c u r r e n t ( a ) 5 0 1 0 1 0 . 1 0 . 0 3 0 . 1 1 1 0 6 0 v g s = 1 0 v s i n g l e p u l s e t a = 2 5 c r d s ( o n ) l i m i t 1 0 m s 1 0 0 m s 1 s d c 1 0 0 1 0 1 1 6 1 0 6 0 1 0 0 6 0 6 0 0 3 0 0 6 0 0 v d s = 1 0 v , i d = 1 a v g s = 4 . 5 v t r t f 3 0 f i g u r e 9 . c a p a c i t a n c e v d s , d r a i n - t o s o u r c e v o l t a g e ( v ) c , c a p a c i t a n c e ( p f ) 6 0 0 5 0 0 4 0 0 3 0 0 2 0 0 1 0 0 0 0 2 4 6 8 1 0 1 2 c i s s c o s s c r s s 0 . 0 1 0 . 1 1 9 0 . 0 0 0 0 1 0 . 0 0 0 1 0 . 0 0 1 0 . 0 1 0 . 1 1 1 0 1 0 0 1 0 0 0 s q u a r e w a v e p u l s e d u r a t i o n ( s e c ) n o r m a l i z e d t h e r m a l t r a n s i e n t i m p e d a n c e c u r v e n o r m a l i z e d t r a n s i e n t t h e r m a l r e s i s t a n c e s i n g l e p u l s e o n p d m t 1 t 2 1 . r t h j a ( t ) = r ( t ) * r j a 2 . r j a = s e e d a t a s h e e t 3 . t j m - t a = p d m * r j a ( t ) 4 . d u t y c y c l e , d = t 1 / t 2 t h t h t h 0 . 0 1 0 . 0 2 0 . 5 0 . 2 0 . 1 0 . 0 5 t d ( o n ) t d ( o f f ) typical characteristics
|
