www . l eadis. c om rev . 1.8 may 12, 2008 l d s 4 3 1 r p 2.5v shunt re f/amplifier product specification revis i on 1.8 may 12, 2008 applications ! p o w e r s u p p l y c o n t r o l l o o p ! low tc voltage reference ! p o w e r m a n a g e m e n t a p p l i c a t i o n s general description the lds431rp is a three-terminal adjustable shunt regulator bas ed on a highly stable b a n d g a p r e f e r e n c e a n d i s a n e x c e l l e n t replacement for standard tl431 references w h e n u s e d a s a s e c o ndary feedback elem ent in switch mode power supplies. the lds431rp meets all of the requirements of the standard 431 specifications that are needed to monitor the secondary output voltage and provide the feedback signal to the primary through an opto-coupler. it is offe r e d i n b o t h t h e v e r y popular sot23-3 and to-92 packages. f e a t u r e s ! p r o g r a m m a b l e p r e c i s e o u t p u t v o l t a g e 2.5v to 15v ! wide temp range: -40o to 85oc standard ! i m p r o v e d s t a b i l i t y w i t h c a p a c i t i v e l o a d s ! low tc voltage reference ! wide range of package options ! rohs com p liant pin conf iguration pin desc riptions pin name function cath output and supply termin a l , must be gre a ter than 2.5 v for normal operation ref input, nomina lly 2.495v in norm a l ope ra tion. anode grou nd an d substrate
leadis te ch nolog y l d s 4 3 1 r p www . l eadis. c om 2 rev . 1.8 may 12, 2008 a b s o l u t e m a x i m u m r a t i n g s stress g r eate r than tho s e listed u nde r absolute ma ximum ratin g s may cau s e p e rm ane n t damag e to the device. t h e s e stre ss rati ngs only, an d functio nal operat ion of t he devi c e at these or any con d ition s be yond those in dicat ed und er re commen ded operating co ndition s is no t implied. exposure to a bsol ute maximum rating fo r e x tended peri ods may aff e ct d e vice re liabilit y. use of sta nda rd esd h andli ng p r e c autio ns i s r e q u i r e d . p a r a m e t e r value units cath v o l t a g e 1 8 v r e f c u r r e n t 10 ma cath, ano d e cu rre nts 100 ma operating ju nction te mpe r ature 150 oc l e a d t e mp e r a tu re (s o l d e ri n g 1 0 s e c o n d s ) 2 6 0 o c storage te m peratu r e ran ge -65 to +150 oc esd rating (hbm) 3 kv e l e c t r i c a l s p e c i f i c a t i o n s electri c al cha r acte ri stics are guarantee d over the fu ll tempe r ature range C 40o c leadis te ch nolog y l d s 4 3 1 r p www . l eadis. c om 3 rev . 1.8 may 12, 2008 t y p i c a l p e r f o r m a n c e c h a r a c t e r i s t i c s r e f e r e n c e v o l t a g e v s j u n c t i o n t e m p e r a t u r e 2 . 4 8 2 . 4 8 5 2 . 4 9 2 . 4 9 5 2 . 5 2 . 5 0 5 - 5 0 - 2 5 0 2 5 5 0 7 5 1 0 0 1 2 5 1 5 0 j u n c t i o n t e m p e r a t u r e ( d e g r e e s c ) r e f e r e n c e v o l t a g e ( v ) r e f e rence input current vs j unct i on t e m p e r a t u r e 2 0 0 3 0 0 4 0 0 5 0 0 6 0 0 7 0 0 8 0 0 - 5 0 - 2 5 0 2 5 5 0 7 5 1 0 0 1 2 5 1 5 0 j u n c t i o n t e m p e r a t u r e ( d e g r e e s c ) r e f e r e n c e i n p u t c u r r e n t ( n a ) c a t hode current vs c a t hode volt age - 1 0 0 - 8 0 - 6 0 - 4 0 - 2 0 0 2 0 4 0 6 0 - 1 0 1 2 3 c a t h o d e v o l t a g e ( v ) c a t h o d e c u r r e n t ( m a )
leadis te ch nolog y l d s 4 3 1 r p www . l eadis. c om 4 rev . 1.8 may 12, 2008 t y p i c a l p e r f o r m a n c e c h a r a c t e r i s t i c s ( c o n t d . ) o ff-s ta te c a th o d e c u r r e n t v s j u n c ti o n t e m p e r a t u r e 0 1 0 2 0 3 0 4 0 5 0 6 0 - 5 0 - 2 5 0 2 5 5 0 7 5 1 0 0 1 2 5 1 5 0 j u n c t i o n t e m p e r a t u r e ( d e g r e e s c ) o f f - s t a t e c a t h o d e c u r r e n t ( n a ) d e l t a r e f e r e n c e v o l t a g e p e r d e l t a c a t h o d e v o l t a g e v s j u n c t i o n t e m p e r a t u r e - 1 . 3 - 1 . 2 - 1 . 1 - 1 - 0 . 9 - 0 . 8 - 0 . 7 - 0 . 6 - 0 . 5 - 5 0 - 2 5 0 2 5 5 0 7 5 1 0 0 1 2 5 1 5 0 j u n c t i o n t e m p e r a t u r e ( d e g r e e s c ) d e l t a r e f e r e n c e v o l t a g e p e r d e l t a c a t h o d e v o l t a g e ( m v / v ) o p e n l o o p v o l t a g e g a i n v s f r e q u e n c y - 1 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 0 . 1 1 1 0 1 0 0 1 0 0 0 1 0 0 0 0 f r e q u e n c y ( k h z ) o p e n l o o p v o l t a g e g a i n ( d b ) d y n a m i c i m p e d a n c e v s f r e q u e n c y 0 . 1 1 1 0 0 . 1 1 1 0 1 0 0 1 0 0 0 1 0 0 0 0 f r e q u e n c y ( k h z ) d y n a m i c i m p e d a n c e ( 0 h m s )
leadis te ch nolog y l d s 4 3 1 r p www . l eadis. c om 5 rev . 1.8 may 12, 2008 p a c k a g e d i m e n s i o n s s o t 2 3 - 3 , s o t 2 3 - 4 , s o t 2 3 - 5 , s o t 2 3 - 6
leadis te ch nolog y l d s 4 3 1 r p www . l eadis. c om 6 rev . 1.8 may 12, 2008 p a c k a g e d i m e n s i o n s t o 9 2 - 3
leadis te ch nolog y l d s 4 3 1 r p www . l eadis. c om 7 rev . 1.8 may 12, 2008 ordering information d e v i c e opera t ing tj % t ol pkg t y pe v o u t wrap ordering nu mber l d s 4 3 1 r p - 4 0 c ? " 8 5 c ? 1.5 to-9 2-3 2.5v bulk lds43 1 rex - n3-25 - bl l d s 4 3 1 r p - 4 0 c ? " 8 5 c ? 1.5 to-9 2-3 2.5v t&r lds43 1 rex - n3-25 - tl l d s 4 3 1 r p - 4 0 c ? " 8 5 c ? 1.5 sot-2 3 -3 2.5v t&r lds43 1 rex - m3-2 5-t l n o t e : lead free and ro hs complia nt. w a r r a n t y a n d u s e l e a d i s t e c h n o l o g y m a k e s n o w a r r a n t y , r e p r e s e n t a t i o n o r g u a r a n t e e , e x p r e s s o r i m p l i e d , r e g a r d i n g t h e s u i t a b i l i t y o f i t s p r o d u c t s f o r a n y p a r t i c u l a r p u r p o s e , n o r t h a t t h e u s e o f i t s p r o d u c t s w i l l n o t i n f r i n g e i t s i n t e l l e c t u a l p r o p e r t y r i g h t s o r t h e r i g h t s o f t h i r d p a r t i e s w i t h r e s p e c t t o a n y p a r t i c u l a r u s e o r a p p l i c a t i o n a n d s p e c i f i c a l l y d i s c l a i m s a n y a n d a l l l i a b i l i t y a r i s i n g o u t o f a n y s u c h u s e o r a p p l i c a t i o n , i n c l u d i n g b u t n o t l i m i t e d t o , c o n s e q u e n t i a l o r i n c i d e n t a l d a m a g e s . l e a d i s t e c h n o l o g y p r o d u c t s a r e n o t d e s i g n e d , i n t e n d e d , o r a u t h o r i z e d f o r u s e a s c o m p o n e n t s i n s y s t e m s i n t e n d e d f o r s u r g i c a l i m p l a n t i n t o t h e b o d y , o r o t h e r a p p l i c a t i o n s i n t e n d e d t o s u p p o r t o r s u s t a i n l i f e , o r f o r a n y o t h e r a p p l i c a t i o n i n w h i c h t h e f a i l u r e o f t h e l e a d i s t e c h n o l o g y p r o d u c t c o u l d c r e a t e a s i t u a t i o n w h e r e p e r s o n a l i n j u r y o r d e a t h m a y o c c u r . l e a d i s t e c h n o l o g y 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 o r d i s c o n t i n u e a n y p r o d u c t o r s e r v i c e d e s c r i b e d h e r e i n w i t h o u t n o t i c e . p r o d u c t s w i t h d a t a s h e e t s l a b e l e d " a d v a n c e i n f o r m a t i o n " o r " p r e l i m i n a r y " a n d o t h e r p r o d u c t s d e s c r i b e d h e r e i n m a y n o t b e i n p r o d u c t i o n o r o f f e r e d f o r s a l e . l e a d i s t e c h n o l o g y a d v i s e s c u s t o m e r s t o o b t a i n t h e c u r r e n t v e r s i o n o f t h e r e l e v a n t p r o d u c t i n f o r m a t i o n b e f o r e p l a c i n g o r d e r s . c i rc uit diagrams illus t rate ty pic a l s e m i c o n d u c t o r a p p l i c a t i o n s a n d m a y n o t b e c o m p l e t e . l e a d i s t e c h n o l o g y 8 0 0 w . c a l i f o r n i a a v e , suite 200 s u n n y v a l e , c a 9 4 0 8 6 phone: 408.33 1.860 0 docume nt no: 431 rl ds fax: 408.33 1.860 1 revisio n : 1.8 h t t p : / / w w w . l e a d i s . c o m issu e date: 5/12/200 8
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