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d u a l i n p u t l o w d r o p o u t r e g u l a 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 . b . 8 - j a n . , 2 0 1 2 a p l 1 5 8 1 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 . 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 adjustable or fixed output 520mv typ. dropout at 5a in dual power voltage mode remote sense pin available 2% accuracy over temperature range built-in over-temperature protection built-in current limit 5 pin to-263 and to-252, sop-8p, to-252-4 packages lead free and green devices available (rohs compliant) m i c r o p r o c e s s o r s u p p l i e s c h i p s e t s u p p l i e s v g a c a r d p o w e r l c d m o n i t o r p o w e r t h e a p l 1 5 8 1 s e r i e s o f h i g h p e r f o r m a n c e p o s i t i v e v o l t - a g e r e g u l a t o r s a r e d e s i g n e d f o r u s e i n a p p l i c a t i o n s r e - q u i r i n g v e r y l o w d r o p o u t v o l t a g e a t 5 a m p . t h e s u p e r i o r d r o p o u t c h a r a c t e r i s t i c s r e s u l t i n r e d u c i n g h e a t d i s s i p a t i o n c o m p a r e d t o r e g u l a r l d o s . t h e a p l 1 5 8 1 a l s o p r o v i d e s e x c e l l e n t r e g u l a t i o n o v e r l i n e , l o a d , a n d t e m - p e r a t u r e v a r i a t i o n s . c u r r e n t l i m i t i s t r i m m e d t o e n s u r e s p e c i f i e d o u t p u t c u r - r e n t a n d c o n t r o l l e d s h o r t - c i r c u i t c u r r e n t . o n - c h i p t h e r m a l l i m i t i n g p r o v i d e s p r o t e c t i o n a g a i n s t a n y c o m b i n a t i o n o f o v e r l o a d t h a t w o u l d c r e a t e e x c e s s i v e j u n c t i o n t e m p e r a t u r e . t h e a p l 1 5 8 1 i s a v a i l a b l e i n b o t h t h e t h r o u g h - h o l e a n d s u r f a c e m o u n t v e r s i o n s o f t h e i n d u s t r y s t a n d a r d 5 - p i n t o - 2 6 3 a n d t o - 2 5 2 , s o p - 8 p , t o - 2 5 2 - 4 p o w e r p a c k a g e s . o r d e r i n g a n d m a r k i n g i n f o r m a t i o n n o t e : a n p e c l e a d - f r e e p r o d u c t s c o n t a i n m o l d i n g c o m p o u n d s / d i e a t t a c h m a t e r i a l s a n d 1 0 0 % m a t t e t i n p l a t e t e r m i n a t i o n f i n i s h ; w h i c h a r e f u l l y c o m p l i a n t w i t h r o h s . a n p e c l e a d - f r e e p r o d u c t s m e e t o r e x c e e d t h e l e a d - f r e e r e q u i r e m e n t s o f i p c / j e d e c j - s t d - 0 2 0 d f o r m s l c l a s s i f i c a t i o n a t l e a d - f r e e p e a k r e f l o w t e m p e r a t u r e . a n p e c d e f i n e s ? g r e e n ? t o m e a n l e a d - f r e e ( r o h s c o m p l i a n t ) a n d h a l o g e n f r e e ( b r o r c l d o e s n o t e x c e e d 9 0 0 p p m b y w e i g h t i n h o m o g e n e o u s m a t e r i a l a n d t o t a l o f b r a n d c l d o e s n o t e x c e e d 1 5 0 0 p p m b y w e i g h t ) . package code g 5 : to - 263 - 5 u 5 : to - 252 - 5 ka : sop - 8 p u 4 : to - 252 - 4 temperature range c : 0 to 70 o c handling code tr : tape & reel voltage code : 15 : 1 . 5 v 18 : 1 . 8 v 25 : 2 . 5 v blank : adjustable version assembly material g : halogen and lead free device apl 1581 handling code temperature range package code voltage code apl 1581 - 15 g 5 / u 5 / u 4 : apl 1581 xxxxx xxxxx - date code 15 assembly material apl 1581 - 15 ka : xxxxx - date code apl 1581 xxxxx
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 . b . 8 - j a n . , 2 0 1 2 a p l 1 5 8 1 w w w . a n p e c . c o m . t w 2 note1: stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. these are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under "recom- mended operating conditions" is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. note 2 : the maximum allowable power dissipation at any t a (ambient temperature) is calculated using: p d (max) = (t j ? t a ) / q ja ; t j = 125c. exceeding the maximum allowable power dissipation will result in excessive die temperature. symbol parameter rating unit v in input voltage 7 v v cntl control voltage 7 v p d power dissipation internally limited w t j junction temperature 150 c t stg storage temperature range - 65 to +150 c t sdr maximum lead soldering temperature, 10 second s 2 60 c a b s o l u t e m a x i m u m r a t i n g s (note 1, 2) t h e r m a l c h a r a c t e r i s t i c s symbol parameter typical value unit q ja junction - to - ambient resistance in free air (note 3) to - 263 - 5 (toplayer plane size : 15mm x 15 mm) to - 252 - 4 / to - 252 - 5 (toplayer plane size : 10mm x 10 mm) sop - 8p (toplayer plane size : 10mm x 10 mm) 28 42 68 o c/w p i n c o n f i g u r a t i o n f r o n t v i e w o f t o - 2 6 3 - 5 f r o n t v i e w o f t o - 2 5 2 - 5 v sense adj (or gnd) v out v cntl v in 1 2 3 4 5 tab is v out v in v cntl v out adj(or gnd) v sense 1 2 3 4 5 tab is v out s o p - 8 p ( t o p v i e w ) n c = n o i n t e r n a l c o n n e c t i o n = t h e r m a l p a d ( c o n n e c t e d t o v o u t p l a n e f o r b e t t e r h e a t d i s s i p a t i o n ) p i n 5 ~ 8 m u s t b e c o n n e c t e d t o g e t h e r b y a s h o r t e s t w i d e t r a c k o r p l a n e . 1 2 3 4 5 6 7 8 vsense adj (or gnd) vcntl vin vout vout vout vout f r o n t v i e w o f t o - 2 5 2 - 4 vsense adj vin vcntl tab is vout 1 2 3 4
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 . b . 8 - j a n . , 2 0 1 2 a p l 1 5 8 1 w w w . a n p e c . c o m . t w 3 t h e r m a l c h a r a c t e r i s t i c s ( c o n t . ) symbol parameter typical value unit q jc junction - to - case resistance (note 4) to - 263 - 5 to - 252 - 4 / to - 252 - 5 4 5 o c/w note 3 : q ja is measured with the component mounted on a high effective thermal conductivity test board in free air. the sizes of the rectangular plane, where the devices are mounted, are shown in the table. note 4: the case temperature is measured on the tab of the device mounted on the test board described in note 3 except the package to-220-5. the case temperature of the to-220-5 is measured on the bottom of the case directly below the die. apl1581 symbol parameter test conditions m in. t yp. m ax. u nit v ref reference voltage apl1581 v cntl =2.7 5 ~5.5v, v in =2.05~5.5v, i o =10ma~5a, v adj =0v 1.225 1.250 1.275 v v out output voltage apl1581 - 15 apl1581 - 18 apl1581 - 25 (i o =0~5a for fixed versions) v cntl =3~5.5v , v in =2.3~5.5v v cntl =3.3~5.5v , v in =2.6~5.5v v cntl =4~5.5v , v in =3.3~5.5v 1.470 1.764 2.450 1.500 1.800 2.500 1.530 1.836 2.550 v reg line line regulation apl1581 apl1581 - 15 apl1581 - 18 apl1581 - 25 (i o =0a for fixed versions) v cn tl =2. 7 5~5.5v, v in =1.75~5.5v, i o =10ma, v adj =0v v cntl =3~5.5v, v in =2.3~5.5v v cntl =3.3~5.5v, v in =2.6~5.5v v cntl =4~5.5v, v in =3~5.5v - - 3 mv reg load load regulation ( n ote 5) apl1581 apl1581 - 15 apl1581 - 18 apl1581 - 25 (i o =0~5a for fixed versions) v cntl =2.75v, v in =2.1v, v adj =0v, i o =10ma~5a v cntl =3v, v in =2.35v v cntl =3.3v, v in =2.65v v cntl =4v, v in =3.35v - - 5 mv v cntl - v out dropout voltage (note 6) apl1581 apl1581 - 15 apl1581 - 18 apl1581 - 25 i o =5a for all versions v in =2.05v, v adj =0v v in =2.3v v in =2.6v v in =3.3v - 1.20 1.35 v v in - v out dropout voltage (note 6) apl1581 apl1581 - 15 apl1581 - 18 apl1581 - 25 i o =5a for all versions v cntl =2.75v, v adj =0v v cntl =3v v cntl =3.3v v cntl =4v - 0.52 0.75 v i limit current limit v cntl - v out =1.5v, v in - v out =0.6v 5 - - a i lmin minimum loa d current (note7) apl1581 v cntl =5v, v in =3.3v, v adj =0v - 0.8 10 ma reg thermal thermal regulation 30m s pulse - 0.01 - % /w psrr power supply ripple rejection apl1581 apl1581 - 15 apl1581 - 18 apl1581 - 25 v ripple =1v pp at 120hz, i o =5a v cntl =5v, v in =5v, v adj =0v v cntl =5.25v, v in =5.25v v cntl =5.55v, v in =5.55v v cntl =6.25v, v in =6.25v 60 70 - db u n l e s s o t h e r w i s e n o t e d , t h e s e s p e c i f i c a t i o n s a p p l y o v e r c i n = 1 0 m f , c c n t l = 1 m f , c o u t = 1 0 m f , a n d t a = 0 t o 7 0 c . t y p i c a l v a l u e s r e f e r t o t a = 2 5 c . v o u t = v s e n s 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
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 . b . 8 - j a n . , 2 0 1 2 a p l 1 5 8 1 w w w . a n p e c . c o m . t w 4 apl1581 symbol parameter test conditions m in. t yp. m ax. u nit i cntl cntl pin current v cntl - v out =1.5v, v in - v out =0.8v , i o =5a - 45 120 ma i gnd ground pin current apl1581 - 15 apl1581 - 18 apl1581 - 25 v cntl =3v, v in =2.3v v cntl =3.3v, v in =2.6v v cntl =4v, v in =3.3v - 8 13 ma i adj adjust pin current apl1581 v cntl =2.75v, v in =2.05v , v adj =0v - 50 120 m a n o t e 5 : l o w d u t y c y c l e p u l s e t e s t w i t h k e l v i n c o n n e c t i o n s a r e r e q u i r e d t o m a i n t a i n d a t a a c c u r a c y . n o t e 6 : d r o p o u t v o l t a g e i s d e f i n e d a s t h e m i n i m u m d i f f e r e n c e b e t w e e n v i n a n d v o u t r e q u i r e d t o m a i n t a i n 1 % v o u t r e g u l a t i o n . n o t e 7 : m i n i m u m l o a d c u r r e n t i s d e f i n e d a s t h e m i n i m u m c u r r e n t r e q u i r e d a t t h e o u t p u t t o m a i n t a i n v o u t r e g u l a t i o n . u n l e s s o t h e r w i s e n o t e d , t h e s e s p e c i f i c a t i o n s a p p l y o v e r c i n = 1 0 m f , c c n t l = 1 m f , c o u t = 1 0 m f , a n d t a = 0 t o 7 0 c . t y p i c a l v a l u e s r e f e r t o t a = 2 5 c . v o u t = v s e n s 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 ( 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 . b . 8 - j a n . , 2 0 1 2 a p l 1 5 8 1 w w w . a n p e c . c o m . t w 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 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 j u n c t i o n t e m p e r a t u r e ( c ) reference voltage (v) a d j u s t p i n c u r r e n t v s . j u n c t i o n t e m p e r a t u r e adjust pin current ( m a) j u n c t i o n t e m p e r a t u r e ( c ) m i n i m u m l o a d c u r r e n t v s . j u n c t i o n t e m p e r a t u r e j u n c t i o n t e m p e r a t u r e ( c ) minimum load current (ma) v i n - v o u t d r o p o u t v o l t a g e v s . o u t p u t c u r r e n t v in -v out dropout voltage (mv) o u t p u t c u r r e n t ( a ) 1.225 1.230 1.235 1.240 1.245 1.250 1.255 1.260 1.265 1.270 1.275 -50 -25 0 25 50 75 100 125 150 -50 -25 0 25 50 75 100 125 150 0.0 0.2 0.4 0.6 0.8 1.0 1.2 v cntl -v out =10.75v v cntl -v out =1.45v 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 0 100 200 300 400 500 600 700 t j =25 o c t j =-50 o c t j =125 o c s h o r t - c i r c u i t c u r r e n t v s . j u n c t i o n t e m p e r a t u r e j u n c t i o n t e m p e r a t u r e ( c ) short-circuit current (a) v c o n t r o l - v o u t d r o p o u t v o l t a g e v s . o u t p u t c u r r e n t v cntl -v out dropout voltage (v) o u t p u t c u r r e n t ( a ) 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 t j =-50 o c t j =0 o c t j =25 o c t j =125 o c -50 -25 0 25 50 75 100 125 150 0 10 20 30 40 50 60 70 80 -50 -25 0 25 50 75 100 125 150 0 2 4 6 8 10 12 14 v in =5.0v v in =3.3v
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 . b . 8 - j a n . , 2 0 1 2 a p l 1 5 8 1 w w w . a n p e c . c o m . t w 6 c o n t r o l p i n c u r r e n t 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 ( a ) v cntl pin current (ma) v i n - v o u t = 0 . 6 v o u t p u t c u r r e n t ( a ) v i n - v o u t = 0 . 8 v v cntl pin current (ma) c o n t r o l p i n c u r r e n t v s . o u t p u t c u r r e n t 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 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 0 20 40 60 80 100 120 140 160 t j =-50 o c t j =0 o c t j =25 o c t j =125 o c t j =75 o c 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 0 10 20 30 40 50 60 70 80 t j =-50 o c t j =0 o c t j =25 o c t j =125 o c t j =75 o c c o n t r o l p i n c u r r e n t v s . o u t p u t c u r r e n t c o n t r o l p i n c u r r e n t 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 ( a ) v cntl pin current (ma) v i n - v o u t = 1 . 0 v o u t p u t c u r r e n t ( a ) v cntl pin current (ma) v i n - v o u t = 4 . 2 5 v 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 0 10 20 30 40 50 60 70 t j =-50 o c t j =0 o c t j =25 o c t j =125 o c t j =75 o c 0 10 20 30 40 50 60 70 80 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 t j =-50 o c t j =0 o c t j =25 o c t j =75 o c t j =125 o c
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . b . 8 - j a n . , 2 0 1 2 a p l 1 5 8 1 w w w . a n p e c . c o m . t w 7 pin name i/o func tion vsense i positive side of the reference voltage , which allows remote sensing to obtain excellent load regulation. adj o negative side of the reference voltage , which allows to use resistor divider to set an expect output voltage. a small bypass capacitor can be connected from this pin to ground to improve psrr performance. gnd o for fixed voltage devices , this is the bottom of the resistor divider that sets the output voltage. vout o output pin of the regulator , which connects to the tab. a minimum of 10 m f capacitor must be connected from this pin to ground to ensure the stability. vcntl i supply pin of the control circuitry, which must be always higher than vout for the device to regulate. (see electrical characteristics) vin i power input pin of the regulator, which must be always higher than vout for the device to regulate. (see electrical characteristics) p i n d e s c r i p t i o n b l o c k d i a g r a m current limit voltage regulation thermal protection v in v cntl v out adj/gnd v sense
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 . b . 8 - j a n . , 2 0 1 2 a p l 1 5 8 1 w w w . a n p e c . c o m . t w 8 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 ( 1 ) a d j u s t a b l e o u t p u t v o l t a g e d e v i c e * v o u t = v r e f ( 1 + r 2 / r 1 ) + i a d j x r 2 w h e r e v r e f = 1 . 2 5 v ( t y p i c a l ) i a d j = 5 0 m a ( t y p i c a l ) * r 1 i s t y p i c a l l y i n r a n g e o f 1 0 0 w t o 1 2 5 w t o s a t i s f y t h e m i n i m u m l o a d c u r r e n t r e q u i r e m e n t . ( 2 ) f i x e d o u t p u t v o l t a g e d e v i c e ( 3 ) w i t h e n a b l e c o n t r o l a p p l i c a t i o n vin vcntl vout vsense v in +3.3v adj apl1581 (adj.) r 1 120 r2 120 v ref gnd gnd c in 100 m f v cntl +5v v out +2.5v/5a c out 470 m f c cntl 10 m f vin vcntl vout vsense v in +3.3v gnd apl1581-25 gnd gnd c in 100 m f v cntl +5v v out +2.5v/5a c out 470 m f c cntl 10 m f vin vcntl vout vsense v in +3.3v adj apl1581 (adj.) r 1 120 r2 120 v ref gnd gnd c in 100 m f v cntl +5v v out +2.5v/5a c out 470 m f c cntl 10 m f q1 q2 10k q1 : apm2301a q2 : apm2300a enable 10k
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 . b . 8 - j a n . , 2 0 1 2 a p l 1 5 8 1 w w w . a n p e c . c o m . t w 9 a p p l i c a t i o n i n f o r m a t i o n general the apl1581 (adjustable or fixed) regulator is a 5 termi- nal device designed specifically to provide extremely low dropout voltages comparable to the pnp type without the disadvantage of the extra power dissipation due to the base current associated with pnp regulators. this is done by bringing out the control pin of the regulator that pro- vides the base current to the power npn and connecting it to a voltage that is greater than the voltage present at the vin pin. this flexibility makes apl1581 ideal for appli- cations where dual inputs are available, such as a com- puter motherboard with an atx power supply that pro- vides 5v and 3.3v to the board. a p l 1 5 8 1 i s e q u i p p e d w i t h a 1 . 2 5 v r e f e r e n c e , p r e c i s i o n a n d f a s t v o l t a g e r e g u l a t i o n s , o n - c h i p c u r r e n t a n d t h e r m a l l i m i t s , a n d r e m o t e s e n s i n g c a p a b i l i t y t o r e d u c e s y s t e m t o t a l c o s t . a p l 1 5 8 1 i s a v a i l a b l e i n s o p - 8 p , t o - 2 5 2 - 5 , a n d t o - 2 6 3 - 5 p a c k a g e s t o m e e t d i f f e r e n t p o w e r d i s s i p a t i o n a p p l i c a t i o n s . o u t p u t v o l t a g e s e t t i n g s e e f i g u r e 1 a d j u s t a b l e a p l 1 5 8 1 d e v e l o p s a 1 . 2 5 v r e f - e r e n c e v o l t a g e b e t w e e n t h e v s e n s e p i n a n d t h e a d j p i n . p l a c i n g a r e s i s t o r b e t w e e n t h e s e t w o t e r m i n a l s c a u s e s a c o n s t a n t c u r r e n t t o f l o w t h r o u g h r 1 a n d d o w n t h r o u g h r 2 t o s e t t h e o v e r a l l o u t p u t v o l t a g e . i n g e n e r a l , r 1 i s c h o s e n s o t h a t t h i s c u r r e n t i s t h e s p e c i f i e d m i n i m u m l o a d c u r r e n t o f 1 0 m a . t h e c u r r e n t o u t o f t h e a d j p i n i s s m a l l , t y p i c a l l y 5 0 m a a n d i t a d d s t o t h e c u r r e n t f r o m r 1 . b e c a u s e i a d j i s v e r y s m a l l , i t n e e d s t o b e c o n s i d e r e d o n l y w h e n v e r y p r e - c i s e o u t p u t v o l t a g e s e t t i n g i s r e q u i r e d . f o r b e s t r e g u l a t i o n , t h e t o p o f t h e r e s i s t o r d i v i d e r 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 s e n s e p i n . t h e a d j u s t a b l e a p l 1 5 8 1 c a n b e p r o g r a m m a b l e t o a n y v o l t a g e s i n t h e r a n g e o f 1 . 2 5 v t o 5 . 5 v a c c o r d i n g t o t h e f o l l o w i n g f o r m u l a : v o u t = v r e f x ( 1 + r1 r2 ) + i a d j x r 2 where v ref = 1.25v (typical) i adj = 50 m a (typical) the recommended r1 is in range of 100 w to125 w to satisfy the minimum load current requirement. proper sizes of r2 and r1 are also concerned for power dissipation. f i g u r e 1 . s e t t i n g o u t p u t v o l t a g e v out v in v cntl r1 r2 vin vcntl vout vsense adj i adj =50 m a apl1581 v ref g r o u n d i n g a n d o u t p u t s e n s i n g t h e a p l 1 5 8 1 a l l o w s t r u e k e l v i n s e n s i n g f o r b o t h t h e h i g h a n d l o w s i d e o f t h e l o a d . f i g u r e 2 s h o w s t h e d e v i c e c o n - n e c t e d t o t a k e a d v a n t a g e o f t h e r e m o t e s e n s e f e a t u r e . t h e s e n s e p i n a n d t h e t o p o f t h e r e s i s t o r d i v i d e r a r e c o n n e c t e d t o t h e t o p o f t h e l o a d ; t h e b o t t o m o f t h e r e s i s t o r d i v i d e r i s c o n n e c t e d t o t h e b o t t o m o f t h e l o a d . t y p i c a l l y , t h e l o a d i s a m i c r o p r o c e s s o r a n d p a r a s i t i c r e s i s t a n c e r p i s m a d e u p o f t h e p c t r a c e s a n d / o r c o n n e c t o r r e s i s t a n c e b e t w e e n t h e r e g u l a t o r a n d t h e p r o c e s s o r . r p i s n o w c o n - n e c t e d i n s i d e t h e r e g u l a t i o n l o o p o f t h e a p l 1 5 8 1 a n d f o r r e a s o n a b l e v a l u e s o f r p t h e l o a d r e g u l a t i o n a t t h e l o a d w i l l b e n e g l i g i b l e . v o l t a g e d r o p s d u e t o r p a r e n o t e l i m i n a t e d ; t h e y w i l l a d d t o t h e d r o p o u t v o l t a g e o f t h e r e g u - l a t o r r e g a r d l e s s o f w h e t h e r t h e y a r e i n s i d e o r o u t s i d e t h e r e g u l a t i o n l o o p . vin vcntl vout vsense v out v in v cntl adj apl1581 r1 r2 load rp adjustable device
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 . b . 8 - j a n . , 2 0 1 2 a p l 1 5 8 1 w w w . a n p e c . c o m . t w 1 0 f i g u r e 2 . r e m o t e v o l t a g e s e n s i n g vin vcntl vout vsense v out v in v cntl gnd apl1581 load rp fixed voltage device g r o u n d i n g a n d o u t p u t s e n s i n g ( c o n t . ) a p p l i c a t i o n i n f o r m a t i o n ( c o n t . ) s t a b i l i t y a n d o u t p u t c a p a c i t o r s t h e c i r c u i t d e s i g n o f u s i n g t h e a p l 1 5 8 1 s e r i e s r e q u i r e s a n o u t p u t c a p a c i t o r a s p a r t o f t h e d e v i c e f r e q u e n c y c o m p e n s a t i o n . t h e f o l l o w i n g c h a r t s h o w s a s t a b l e r e - g i o n t o s e l e c t o u t p u t c a p a c i t o r f o r a p l 1 5 8 1 . t h i s r e g i o n a b o v e t h e c u r v e i n d i c a t e s m i n i m u m r e q u i r e d e s r a n d c a p a c i t a n c e t o m a i n t a i n s t a b i l i t y . h o w e v e r , t h e o u t p u t c a - p a c i t o r s h o u l d h a v e a n e s r l e s s t h a n 1 w . capacitance( m f) e s r ( m w ) stable region 0 20 40 60 80 100 1 10 100 1000 a l o w - e s r s o l i d t a n t a l u m a n d a l u m i n u m e l e c t r o l y t i c c a - p a c i t o r ( e s r < 1 w ) w o r k s e x t r e m e l y w e l l a n d p r o v i d e s g o o d t r a n s i e n t r e s p o n s e a n d s t a b i l i t y o v e r t e m p e r a t u r e . u l t r a - l o w - e s r c a p a c i t o r s , s u c h a s c e r a m i c c h i p c a p a c i t o r s , m a y p r o m o t e u n s t a b l e o r u n d e r - d a m p e d t r a n s i e n t r e s p o n s e , b u t p r o p e r c e r a m i c c h i p c a p a c i t o r s p l a c e d n e a r l o a d s c a n b e u s e d a s d e c o u p l i n g c a p a c i t o r s . t h e o u t p u t c a p a c i t o r s a r e a l s o u s e d t o r e d u c e t h e s l e w r a t e o f l o a d c u r r e n t a n d h e l p t h e a p l 1 5 8 1 t o m i n i m i z e v a r i a t i o n s o f t h e o u t p u t v o l t a g e , i m p r o v i n g t r a n s i e n t r e s p o n s e . f o r t h i s p u r p o s e , t h e l o w - e s r c a p a c i t o r s a r e r e c o m m e n d e d . i n p u t c a p a c i t o r s t h e i n p u t c a p a c i t o r s o f v c n t l a n d v i n p i n s a r e n o t r e - q u i r e d f o r s t a b i l i t y b u t f o r s u p p l y i n g s u r g e c u r r e n t s d u r i n g l a r g e l o a d t r a n s i e n t s , a n d t h i s w i l l p r e v e n t t h e i n p u t r a i l f r o m d r o o p i n g a n d i m p r o v e t h e p e r f o r m a n c e o f t h e a p l 1 5 8 1 . b e c a u s e p a r a s i t i c i n d u c t o r s f r o m v o l t a g e s o u r c e s o r o t h e r b u l k c a p a c i t o r s t o t h e v c n t l a n d v i n p i n s w i l l l i m i t t h e s l e w r a t e o f t h e s u r g e c u r r e n t s d u r i n g l a r g e l o a d t r a n s i e n t s , r e s u l t i n g i n v o l t a g e d r o p a t v i n a n d v c n t l p i n s . a c a p a c i t o r o f 1 m f ( c e r a m i c c h i p c a p a c i t o r ) o r g r e a t e r ( a l u m i n u m e l e c t r o l y t i c c a p a c i t o r ) i s r e c o m m e n d e d a n d c o n n e c t e d n e a r v c n t l p i n . f o r v i n p i n , a n a l u m i n u m e l e c t r o l y t i c c a p a c i t o r ( > 3 3 m f ) i s r e c o m m e n d e d . i t i s n o t n e c e s s a r y t o u s e l o w - e s r c a p a c i t o r s . m o r e c a p a c i t a n c e r e d u c e s t h e v a r i a t i o n s o f t h e i n p u t v o l t a g e a t v i n p i n . l a y o u t a n d t h e r m a l c o n s i d e r a t i o n the apl1581 series have internal power and thermal limiting (t j = 150 o c typical) circuitry designed to protect the device under overload conditions. however, maximum junction temperature ratings should not be exceeded under continuous normal load conditions. careful con- sideration must be given to all sources of thermal resis- tance from junction to ambient, including junction-to-case, case-to-heat sink interface, and heat sink resistance itself. see figure 3, the sop-8p is a cost-effective package featuring a small size as a standard sop-8 and a bottom thermal pad to minimize the thermal resistance of the package, being applicable to high current applications. the thermal pad is soldered to the top vout plane which may be connected to internal or bottom vout plane by vias to reduce the heat sink thermal resistance. therefore, the printed circuit board (pcb) forms a heat sink and dissipates heat into ambient air.
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 . b . 8 - j a n . , 2 0 1 2 a p l 1 5 8 1 w w w . a n p e c . c o m . t w 1 1 f i g u r e 3 . r e c o m m e n d e d s o p - 8 p l a y o u t l a y o u t a n d t h e r m a l c o n s i d e r a t i o n ( c o n t . ) a p p l i c a t i o n i n f o r m a t i o n ( c o n t . ) 1 2 3 4 8 7 6 5 top layer vout plane for heat dissipation (larger area is better) c out c in soldering area (140mil x 110mil) for bottom pad vias vias c cntl load
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 . b . 8 - j a n . , 2 0 1 2 a p l 1 5 8 1 w w w . a n p e c . c o m . t w 1 2 p a c k a g e i n f o r m a t i o n t o - 2 6 3 - 5 l view a 0 0 . 2 5 gauge plane a 1 seating plane note : follow jedec to-263 bb. see view a e d l 1 a c2 b c e1 d 1 e h s y m b o l min. max. 4.83 0.00 0.38 0.74 1.14 1.65 0.25 6.00 a a1 c c2 d d1 e millimeters b 0.51 0.99 1.70 bsc to-263-5 9.65 11.43 6.22 0.067 bsc min. max. inches 0.190 0.000 0.020 0.039 0.015 0.029 0.045 0.065 0.236 0.380 0.450 0.245 4.06 0.160 0.010 e1 0.380 0.066 0.110 l l1 e 1.78 8.38 9.65 1.68 2.79 0.070 0.330 0 h 14.61 15.88 0.575 0.625 9.00 9.00 0.354 0.354 1.70 bsc 8 o 0 o 0 o 8 o
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 . b . 8 - j a n . , 2 0 1 2 a p l 1 5 8 1 w w w . a n p e c . c o m . t w 1 3 p a c k a g e i n f o r m a t i o n t o - 2 5 2 - 5 s y m b o l min. max. 2.39 4.32 5.46 0.46 0.61 0.13 5.33 a a1 b3 c c2 d d1 e millimeters b 0.50 0.89 1.27 bsc to-252-5 4.57 6.35 6.73 6.22 0.050 bsc min. max. inches 0.094 0.020 0.035 0.170 0.215 0.018 0.024 0.210 0.180 0.250 0.265 2.18 0.245 0.086 0.005 e1 0.035 0.070 0.410 l3 h l e 9.40 1.40 0.46 0.89 1.78 10.41 0.370 0.055 0.018 0.150 3.81 0.89 2.03 0.035 0.080 0 0 8 0 8 0 0 . 2 5 gauge plane l a 1 view a seating plane l 3 d e b3 h a see view a c2 b c e1 d 1 e 6.00 6.00 0.236 0.236
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 . b . 8 - j a n . , 2 0 1 2 a p l 1 5 8 1 w w w . a n p e c . c o m . t w 1 4 p a c k a g e i n f o r m a t i o n t o - 2 5 2 - 4 0 0 . 2 5 gauge plane l a 1 view a seating plane l 4 l 3 d e b3 h a see view a c2 b c e1 d 1 e s y m b o l min. max. 2.39 4.32 5.46 0.46 0.61 0.13 5.33 a a1 b3 c c2 d d1 e millimeters b 0.50 0.71 1.27 bsc 4.57 6.35 6.73 6.22 0.050 bsc min. max. inches 0.094 0.020 0.028 0.170 0.215 0.018 0.024 0.210 0.180 0.250 0.265 2.18 0.245 0.086 0.005 e1 0.035 0.070 0.410 l3 h l e 9.40 1.40 0.46 0.89 1.78 10.41 0.370 0.055 0.018 0.040 l4 1.02 0.150 3.81 0.89 2.03 0.035 0.080 0 0 8 0 8 6.00 6.00 to-252-4 0.236 0.236
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 . b . 8 - j a n . , 2 0 1 2 a p l 1 5 8 1 w w w . a n p e c . c o m . t w 1 5 p a c k a g e i n f o r m a t i o n s o p - 8 p thermal pad d d1 e 2 e 1 e e b a 2 a a 1 view a l 0 . 2 5 gauge plane seating plane q note : 1. followed from jedec ms-012 ba. 2. dimension "d" does not include mold flash, protrusions or gate burrs. mold flash, protrusion or gate burrs shall not exceed 6 mil per side . 3. dimension "e" does not include inter-lead flash or protrusions. inter-lead flash and protrusions shall not exceed 10 mil per side. 0.020 0.010 0.020 0.050 0.006 0.063 max. 0.40 l q 0 o c e e h e1 0.25 d c b 0.17 0.31 0.016 1.27 8 o c 0 o c 8 o c 0.50 1.27 bsc 0.51 0.25 0.050 bsc 0.010 0.012 0.007 millimeters min. s y m b o l a1 a2 a 0.00 1.25 sop-8p max. 0.15 1.60 min. 0.000 0.049 inches d1 2.50 0.098 2.00 0.079 e2 3.50 3.00 0.138 0.118 4.80 5.00 0.189 0.197 3.80 4.00 0.150 0.157 5.80 6.20 0.228 0.244 h x 4 5 o c see view a -t- seating plane < 4 mils
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 . b . 8 - j a n . , 2 0 1 2 a p l 1 5 8 1 w w w . a n p e c . c o m . t w 1 6 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 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 application a h t1 c d d w e1 f 330.0 ? 2.00 50 min. 16.4+2.00 - 0.00 13.0+0.50 - 0.20 1.5 min. 20.2 min. 16.0 ? 0.30 1.75 ? 0.10 7.50 ? 0.05 p 0 p1 p 2 d 0 d1 t a 0 b 0 k 0 to - 252 - 4 4.0 ? 0.10 8.0 ? 0.10 2.0 ? 0.05 1.5+0.10 - 0.00 1.5 min. 0.6+0.00 - 0.40 6.80 ? 0.20 10.40 ? 0.20 2.50 ? 0.20 application a h t1 c d d w e1 f 330.0 ? 2.00 50 min. 16.4+2.00 - 0.00 13.0+0.50 - 0.20 1.5 min. 20.2 min. 16.0 ? 0.30 1.75 ? 0.10 7.50 ? 0.05 p 0 p1 p 2 d 0 d1 t a 0 b 0 k 0 to - 252 - 5 4.0 ? 0.10 8.0 ? 0.10 2.0 ? 0.05 1.5+ 0.10 - 0.00 1.5 min. 0.6+0.00 - 0.40 6.80 ? 0.20 10.40 ? 0.20 2.50 ? 0.20 application a h t1 c d d w e1 f 330.0 ? 2.00 50 min. 24.4+2.00 - 0.00 13.0+0.50 - 0.20 1.5 min. 20.2 min. 24.0 ? 0.30 1.75 ? 0.10 11.5 ? 0.10 p 0 p1 p 2 d 0 d1 t a 0 b 0 k 0 to - 263 - 5 4.0 ? 0.10 16.0 ? 0.10 2.0 ? 0.10 1.5+0.10 - 0.00 1.5 min. 0.6+0.00 - 0.40 10.8 ? 0.20 16.1 ? 0.20 5.2 ? 0.20 application a h t1 c d d w e1 f 330.0 ? 2.00 50 min. 12.4+2.00 - 0.00 13.0+0.50 - 0.20 1.5 min. 20.2 min. 12.0 ? 0.30 1.75 ? 0.10 5.5 ? 0.05 p 0 p1 p 2 d 0 d1 t a 0 b 0 k 0 sop - 8p 4.0 ? 0.10 8.0 ? 0.10 2.0 ? 0.05 1.5+0.10 - 0.00 1.5 min. 0.6+0.00 - 0.40 6.40 ? 0.20 5.20 ? 0.20 2.10 ? 0.20 (mm)
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . b . 8 - j a n . , 2 0 1 2 a p l 1 5 8 1 w w w . a n p e c . c o m . t w 1 7 package type unit devices per reel to - 252 - 4 type & reel 2500 to - 252 - 5 type & reel 2500 to - 263 - 5 type & reel 800 sop - 8p type & reel 2500 d e v i c e s p e r u n i t 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 t o - 2 5 2 - 5 user direction of feed t o - 2 5 2 - 4 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 . b . 8 - j a n . , 2 0 1 2 a p l 1 5 8 1 w w w . a n p e c . c o m . t w 1 8 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 t o - 2 6 3 - 5 user direction of feed s o p - 8 p 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 . b . 8 - j a n . , 2 0 1 2 a p l 1 5 8 1 w w w . a n p e c . c o m . t w 1 9 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 2. pb - free process ? classification temperatures (tc) package thickness volume mm 3 <350 volume mm 3 350 - 2000 volume mm 3 >2000 <1.6 mm 260 c 260 c 260 c 1.6 mm ? 2.5 mm 260 c 250 c 245 c 3 2.5 mm 250 c 245 c 245 c table 1. snpb eutectic process ? classification temperatures (tc) package thickness volume mm 3 <350 volume mm 3 3 350 <2.5 mm 235 c 22 0 c 3 2.5 mm 220 c 220 c test item method description solderability jesd - 22, b102 5 sec, 245 c holt jesd - 22, a108 1000 hrs, bias @ t j =125 c pct jesd - 22, a102 168 hrs, 100 % rh, 2atm , 121 c tct jesd - 22, a104 500 cycles, - 65 c~150 c hbm mil - std - 883 - 3015.7 vhbm ? 2kv mm jesd - 22, a1 15 vmm ? 200v latch - up jesd 78 10ms, 1 tr ? 100ma r e l i a b i l i t y t e s t p r o g r a m
c o p y r i g h t ? a n p e c e l e c t r o n i c s c o r p . r e v . b . 8 - j a n . , 2 0 1 2 a p l 1 5 8 1 w w w . a n p e c . c o m . t w 2 0 c u s t o m e r s e r v i c e a n p e c e l e c t r o n i c s c o r p . head office : no.6, dusing 1st road, sbip, hsin-chu, taiwan, r.o.c. tel : 886-3-5642000 fax : 886-3-5642050 t a i p e i b r a n c h : 2 f , n o . 1 1 , l a n e 2 1 8 , s e c 2 j h o n g s i n g r d . , s i n d i a n c i t y , t a i p e i c o u n t y 2 3 1 4 6 , t a i w a n t e l : 8 8 6 - 2 - 2 9 1 0 - 3 8 3 8 f a x : 8 8 6 - 2 - 2 9 1 7 - 3 8 3 8

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