e l ek tr on isch e b a u e lemen te d e s c r i p t i o n 01 -jun-2002 rev. a page 1 of 5 http://www.secosgmbh.com/ any changing of specification will not be informed individual r o h s c o m p l i a n t p r o d u c t typical circuit ref. min. max. ref. min. max. a 4.40 4.80 c1 1.25 1.45 b 0.76 1.00 b1 1.17 1.47 c 0.36 0.50 l 13.25 14.25 d 8.60 9.00 e 2.54 ref. e 9.80 10.4 l1 2.60 2.89 l4 14.7 15.3 ? 3.71 3.96 l5 6.20 6.60 a1 2.60 2.80 millimeter millimeter functional block diagram s e 2 1 4 8 1 . 5 a c m o s l o w d r o p o u t v o l t a g e r e g u l a t o r t h e s e 2148 is stable w i t h a n o u t p u t c a p a c i t a n c e o f 4 . 7 m f o r g r e a t e r . t h e s e 2148 positive,linear regulators feature low quiescent c u r r e n t ( 4 5 m a t y p . ) w i t h l o w d r o p o u t v o l t a g e , m a k i n g t h e m i d e a l f o r b a t t e r y a p p l i c a t i o n s . these rugged devices have both t h e r m a l s h u t d o w n a n d c u r r e n t f o l d - b a c k t o p r e v e n t d e v i c e f a i l u r e u n d e r t h e " w o r s t " o f o p e r a t i n g c o n d i t i o n s . f e a t u r e s * low temperature coefficient * over-temperature shutdown * very low dropout voltage * high accurate 1.5% * short circuit current fold-back * guaranteed 1.5 a output * current limiting * portable electronics applications * pc peripherals * wireless devices * battery powered widgets * instrumentation s e 2 1 4 8 s e 2 1 4 8 - 1 5 p a r t n u m b e r m a r k i n g o u t p u t v o l t a g e p a r t n u m b e r m a r k i n g o u t p u t v o l t a g e 8 v 1 5 2 1 . 5 v x x x x o r d e r i n g i n f o r m a t i o n ( c o n t d . ) s e 2 1 4 8 - 1 9 8 v 1 9 2 1 . 9 v x x x x s e 2 1 4 8 - 1 8 8 v 1 8 2 1 . 8 v x x x x s e 2 1 4 8 - 2 5 8 v 2 5 2 2 . 5 v x x x x s e 2 1 4 8 - 3 3 8 v 3 3 2 3 . 3 v x x x x s e 2 1 4 8 - 5 0 8 v 5 0 2 5 . 0 v x x x x s e 2 1 4 8 - 4 7 8 v 4 7 2 4 . 7 5 v x x x x
e l e k t r o n i s c h e b a u e l e m e n t e h t t p : / / w w w . s e c o s g m b h . c o m / a n y c h a n g i n g o f s p e c i f i c a t i o n w i l l n o t b e i n f o r m e d i n d i v i d u a l 01-jun-2002 rev. a page 2 of 5 a b s o l u t e m a x i m u m r a t i n g s pa r a m e te r sy m b o l r a ti n g s u n i t i n p u t m a x v o l t a g e v i n 8 v o u t p u t c u r r e n t i o u t p d / ( v i n - v o ) a o u t p u t v o l t a g e v o u t 1 . 5 ~ 5 . 0 v o p e r a t i n g a m b i e n t t e m p e r a t u r e t o p r - 4 0 ~ + 8 5 : ju n ct i o n t e m p e r a t u r e t j - 4 0 ~ + 1 2 5 : m a x i m u m j u n c t i o n t e m p e r a t u r e t j m a x 1 5 0 : j c ( c o n d u c t i v e e p o x y ) * 6 / w : t h e r m a l r e si st a n ce j a 5 5 / w : i n t e r n a l p o w e r d i ss i p a t i o n p d 2 . 2 w e d s c l a ssi f i ca t i o n b * m e a s u r e j c o n b a c k s i d e c e n t e r o f t a b . 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 = v o u t ( t ) + 2 v , t a = 2 5 : u n l e s s o t h e r w i s e n o t e d pa r a m e te r sy m b o l c o n d i t i o n m i n t yp m a x u n i t o u t p u t v o l t a g e v o u t (e) (n o t e 1 ) i o = 1 m a - 1 . 5 % v o u t ( t ) (n o t e 2 ) 1 . 5 % v o u t p u t c u rre n t i o v o > 1 . 2 v 1 . 5 - - a c u rre n t l i m i t i l i m v o > 1 . 2 v 1 . 5 2 . 0 - a l o a d r e g u l a t i o n r eg l o a d v i n = v o u t ( t ) + 2 v , i o = 1 m a t o 1 . 5 a - 1 0 . 2 1 % 1 . 4 v < v o u t ( t ) 2 . 0 v - - 1 3 0 0 2 . 0 v < v o u t ( t ) 2 . 8 v - - 8 0 0 d ro p o u t v o l t a g e v d r o p o u t i o = 1 . 5 a v o = v o u t ( e ) - 2 % 2 . 8 v < v o u t ( t ) - - 6 0 0 m v q u i e s ce n t c u rre n t i q v i n = v o u t ( t ) + 2 v , i o = 0 m a - 4 5 7 0 a g ro u n d pi n c u rre n t i g n d v i n = v o u t ( t ) + 2 v , i o = 1 m a ~ 1 . 5 a - 4 5 - a v o u t ( t ) < 2 . 0 v - 0 . 1 5 - 0 . 1 5 2 . 0 v v o u t ( t ) < 4 . 0 v - 0 . 1 0 . 0 2 0 . 1 l i n e r e g u l a t i o n r eg l i n e i o = 1 m a v i n = v o u t ( t ) + 1 t o v o u t ( t ) + 2 4 . 0 v v o u t ( t ) - 0 . 4 - 0 . 4 % i n p u t v o l t a g e v i n n o t e 3 - 7 v o ve r t e m p e r a t u r e s h u t d o w n o t s - 1 5 0 - : o ve r t e m p e r a t u r e h y st e r i si s o t h - 3 0 - : o u t p u t v o l t a g e t e m p e ra t u re c o e f f i ci e n t t c - 3 0 - p p m / : sh o rt c i rcu i t c u rre n t i s c v i n = v o u t ( t ) + 1 v , v o u t < 0 . 4 v - 7 5 0 - m a f = 1 0 0 h z - 7 0 - f = 1 kh z - 5 0 - po w e r su p p l y r e j e ct i o n psr r i o = 1 0 0 m a c o = 4 . 7 f f = 1 0 kh z - 2 0 - d b o u t p u t v o l t a g e n o i s e e n f = 1 0 h z ~ 1 0 0 kh z , i o = 1 0 m a , c o = 4 . 7 f - 3 0 - v r m s n o t e 1 : v o u t ( e ) = e f f e c t i v e o u t p u t v o l t a g e ( i . e . t h e o u t p u t v o l t a g e w h e n ? v o u t ( t ) + 2 . 0 v ? i s p r o v i d e d a t t h e v i n p i n w h i l e m a i n t a i n i n g a c e r t a i n i o u t v a l u e ) . 2 : v o u t ( t ) = s p e c i f i e d o u t p u t v o l t a g e 3 : v i n ( m i n ) = v o u t + v d r o p o u t SE2148 1.5a cmos low dropout voltage regulator
01-jun-2002 rev. a page 3 of 5 h t p : / / w w w . s e c o s g m b h . c o m / a n y c h a n g i n g o f s p e c i f i c a t i o n w i l l n o t b e i n f o r m e d i n d i v i d u a l e l e k t r o n i s c h e b a u e l e m e n t e ( t ) + 1 t o detailed description the se214 8 of coms regulators contain a pmos pass transistor,voltage reference, error amplifier,over-current protection and thermal shutdown.the p-channel pass transistor receives data from the error amplifier, over-current shutdown, and thermal protection circuits. during normal operation, the error amplifier compares the output voltage to a precision reference. over-current and thermal shutdown circuits become active when the junction temperature exceeds15 0 c, or the current exceeds 2.2a. during thermal shutdown, the output voltage remains low. normal operation is restored when the junction temperature drops below 120 c.the s e21 48 behaves like a current source when the load reaches 2.2a. however, if the load impedance drops below 0.3 , the current drops back to 600ma to prevent excessive power dissipation. normal operation is restored when the load resistance exceeds of 0.75 . o o external capacitors the SE2148 is stable with an output capacitance to ground of 4.7uf or greater. ceramic capacitors have the lowest esr, and will offer the best ac performance. conversely, aluminum electrolytic capacitors exhibit the highest esr, resulting in the poorest ac response. unfortunately, large value ceramic capacitors are comparatively expensive. one option is to parallel a 0.1uf ceramic capacitor with a 10uf aluminum electrolytic. the benefit is low esr, high capacitance, and low overall cost. a second capacitor is recommended between the input and ground to stabilize v in. the input capacitor should be at least 0.1uf to have a beneficial effect. all capacitors should be placed in closed proximity to the pins. a "quiet" ground termination is desirable. this can be achieved with a "star" connection. [ [ characteristics curve SE2148 1.5a cmos low dropout voltage regulator
e l ek tr on isch e b a u e lemen te 01 -jun-2002 rev. a page 5 of 5 http://www.secosgmbh.com/ any changing of specification will not be informed individual SE2148 1.5a cmos low dropout voltage regulator
e l e k t r o n i s c h e b a u e l e m e n t e h t t p : / / w w w . s e c o s g m b h . c o m / a n y c h a n g i n g o f s p e c i f i c a t i o n w i l l n o t b e i n f o r m e d i n d i v i d u a l 01-jun-2002 rev. a page 5 of 5 s e2148 1.5a cmos low dropout voltage regulator
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