1 www.semtech.com ez1580/ez1581 ez1582/ez1583 dual input low dropout regulator power management revision: february 18, 2005 the ez158x family of high performance positive voltage regulators are designed for use in applications requiring very low dropout voltage at up to 7, 5, 3 and 1.5 amps. capable of supplying up to 2.8v on boards where both 5v and 3.3v supplies are available, the superior dropout characteristics of the ez158x result in reduced heat dissipation compared to regular ldos. this allows for heatsink size reduction or elimination. additionally, the ez158x provides excellent regulation over variations in line, load and temperature. remote sense operation allows compensating for trace, connector and other resistive losses. outstanding features include very low dropout performance at rated current, fast transient response, remote sense, internal current limiting, thermal shutdown and safe operating area protection of the output device. the ez158x is a five terminal adjustable or fixed 2.5v voltage regulator available in the popular 5 pin to-220 and to-263 plastic packages. ? 540mv dropout @ 7a in dual supply mode (ez1580) ? remote sense operation ? fast transient response ? 0.5% initial accuracy ? line regulation typically 0.08% ? load regulation typically 0.08% ? 5 pin to-220 and to-263 packages ? microprocessor supplies ? split plane microprocessor supplies ? advanced graphics cards ? sound cards ? low voltage logic supplies ? switching power supply post regulation notes: (1) capacitor values are for reference only. good quality, low esr tantalum or aluminum electrolytic capacitors should be used. increasing the value of the output capacitor will improve the overall transient response. (2) if the same voltage is input to both pwr and ctl, then the dropout voltage will become 1.3v maximum. (3) a small (~0.033f) capacitor can be used to bypass the adj pin to improve transient response, if needed. 2.5v out 3.3v power in 5v control in ground ground c2 10uf c1 33uf c3 68uf r1 124 r2 124 u1 ez158xcx 4 3 2 1 5 ctl out adj sns pwr vref 2 r i 1 r 2 r 1 v v adj ref out ? + ? ? ? ? ? ? + = ground ground 3.3v power in 2.5v out 5v control in c2 10uf u1 ez158xcx-2.5 4 3 2 1 5 ctl out gnd sns pwr c3 68uf c1 33uf adjustable output parts (3) fixed output parts description features applications typical application circuits
2 ? 2005 semtech corp. www.semtech.com ez1580/ez1581 ez1582/ez1583 power management absolute maximum ratings r e t e m a r a pl o b m y sm u m i x a ms t i n u e g a t l o v t u p n i r e w o pv r w p 7v e g a t l o v t u p n i l o r t n o cv l t c 2 . 3 1v n o i t a p i s s i d r e w o pp d d e t i m i l y l l a n r e t n iw t n e i b m a o t n o i t c n u j e c n a t s i s e r l a m r e h t 0 2 2 - o t x 8 5 1 z e 3 6 2 - o t x 8 5 1 z e a j 0 5 0 6 w / c e s a c o t n o i t c n u j e c n a t s i s e r l a m r e h t ) 3 6 2 - o t & 0 2 2 - o t ( 1 / 0 8 5 1 z e ) 3 6 2 - o t & 0 2 2 - o t ( 3 / 2 8 5 1 z e c j 2 3 w / c e g n a r e r u t a r e p m e t n o i t c n u j g n i t a r e p ot j 5 2 1 + o t 0c e g n a r e r u t a r e p m e t e g a r o t st g t s 0 5 1 + o t 5 6 -c . c e s 0 1 ) g n i r e d l o s ( e r u t a r e p m e t d a e lt d a e l 0 0 3c ) l e d o m y d o b n a m u h ( g n i t a r d s ed s e2v k electrical characteristics (7) unless specified: v out = v sns , v adj = 0v, c ctl = c pwr = c out = 10f. values in bold apply over full operating temperature range. r e t e m a r a pl o b m y ss n o i t i d n o c t s e tn i mp y tx a ms t i n u e g a t l o v e c n e r e f e r ) 1 ( v f e r v r w p v , v 5 0 . 2 = l t c i , v 5 . 4 = t u o a m 0 1 =7 3 2 . 10 5 2 . 13 6 2 . 1v ) s n o i s r e v e g a t l o v . j d a (v r w p , v 5 0 . 2 = v l t c a m 0 1 , v 5 . 4 = 3 ? 2005 semtech corp. www.semtech.com power management ez1580/ez1581 ez1582/ez1583 electrical characteristics (cont.) (7) unless specified: v out = v sns , v adj = 0v, c ctl = c pwr = c out = 10f. values in bold apply over full operating temperature range. r e t e m a r a pl o b m y ss n o i t i d n o c t s e tn i mp y tx a ms t i n u t n e r r u c n i p l o r t n o c ) 3 ( 3 8 5 1 z ei l t c v r w p v = t u o v , v 8 . 0 + l t c i , v 5 . 4 = t u o i = d e t a r 6 0 2 1 a m 2 8 5 1 z e 0 3 0 2 1 1 8 5 1 z e 3 3 0 2 1 0 8 5 1 z e 0 6 0 2 1 t n e r r u c n i p t s u j d ai j d a v r w p v , v 5 0 . 2 = l t c i , v 5 . 4 = t u o a m 0 1 =0 5 0 2 1 a t n e r r u c d a o l m u m i n i m ) 4 ( i ) n i m ( t u o v r w p v = t u o v , v 8 . 0 + l t c v 5 =5 0 1 a m t i m i l t n e r r u c 3 8 5 1 z ei l c v r w p v = t u o v , v 8 . 0 + l t c , v 5 . 4 = 6 . 1 a 2 8 5 1 z e ? v t u o v m 0 0 1 = 1 . 3 1 8 5 1 z e 1 . 5 0 8 5 1 z e 1 . 7 o i t a r n o i t c e j e r e l p p i r ) 5 ( r a v r w p v = l t c i , v 5 = o i = d e t a r 0 60 8b d n o i t a l u g e r l a m r e h t ) 6 ( g e r ) l a m r e h t ( 2 0 0 . 02 0 . 0w / % notes: (1) low duty cycle pulse testing with kelvin connections required. (2) minimum input to output voltage differential required to maintain 1% regulation. (3) current used to drive the output section. (4) required to maintain regulation. resistor divider r1, r2 is usually utilized for minimum load current. (5) v ripple = 1v pk-pk , 120hz. (6) 30ms. (7) i rated = 1.5a for ez1583, 3a for ez1582, 5a for ez1581 and 7a for ez1580.
4 ? 2005 semtech corp. www.semtech.com ez1580/ez1581 ez1582/ez1583 power management notes: (1) where -x.x denotes voltage options. available voltage is: 2.5v. leave blank for adjustable version (1.3 to 5.7v). (2) only available in tube packaging. a tube contains 50 devices. (3) only available in tape and reel packaging. a reel contains 800 devices. (4) lead free product. this product is fully weee and rohs compliant. where x = 0; 1; 2 or 3. x.x denotes voltage options. e c i v e d ) 1 ( e g a k c a pi out ) a ( x . x - t c 0 8 5 1 z e n i p - 5 , 0 2 2 - o t ) 2 ( 7 x . x - t c 1 8 5 1 z e5 x . x - t c 2 8 5 1 z e3 x . x - t c 3 8 5 1 z e5 . 2 r t . x . x - m c 0 8 5 1 z e n i p - 5 , 3 6 2 - o t ) 3 ( 7 r t . x . x - m c 1 8 5 1 z e5 r t . x . x - m c 2 8 5 1 z e3 r t . x . x - m c 3 8 5 1 z e5 . 2 t r t m c 3 8 5 1 z e ) 4 ( t r t x . x - m c x 8 5 1 z e ) 4 ( - pin configurations ordering information # n i pl o b m y se m a n n i pn o i t c n u f n i p 1s n se s n e s s i t i n i p s i h t h t i w . e c i v e d s i h t r o f e g a t l o v e c n e r e f e r e h t f o e d i s e v i t i s o p e h t s i n i p s i h t . d a o l e h t t a e g a t l o v t u p t u o e h t e s n e s n i v l e k o t e l b i s s o p 2j d at s u j d a e s n o p s e r t n e i s n a r t . e c i v e d s i h t r o f e g a t l o v e c n e r e f e r e h t f o e d i s e v i t a g e n e h t s i n i p s i h t . d n u o r g o t n i p t s u j d a e h t m o r f r o t i c a p a c s s a p y b l l a m s a g n i d d a y b d e v o r p m i e b n a c 3t u ot u p t u o . b a t e h t o t d e t c e n n o c y l l a c i r t c e l e s i n i p s i h t . e c i v e d e h t f o t u p t u o r e w o p e h t s i s i h t 4l t cl o r t n o c s i h t o t n i w o l f t n e r r u c e h t . e c i v e d e h t r o f y r t i u c r i c l o r t n o c e h t r o f n i p y l p p u s e h t s i n i p s i h t e g a t l o v e h t , e t a l u g e r o t e c i v e d e h t r o f . t n e r r u c t u p t u o e h t f o % 1 y l e t a m i x o r p p a e b l l i w n i p . e g a t l o v t u p t u o e h t n a h t r e t a e r g v 3 . 1 d n a v 0 . 1 n e e w t e b e b t s u m n i p s i h t n o 5r w pr e w o p s i t n e r r u c d a o l t u p u o e h t . 3 8 5 1 z e e h t f o e c i v e d r e w o p e h t o t t u p n i r o t c e l l o c e h t s i s i h t e b t s u m n i p s i h t n o e g a t l o v e h t , e t a l u g e r o t e c i v e d e h t r o f . n i p s i h t h g u o r h t d e i l p p u s . t n e r r u c d a o l n o p u g n i d n e p e d , e g a t l o v t u p t u o e h t n a h t r e t a e r g v 8 . 0 d n a v 1 . 0 n e e w t e b pin descriptions block diagram n i pn o i t c n u f 1s n s 2j d a 3t u o 4l t c 5r w p t u o s i b a t
5 ? 2005 semtech corp. www.semtech.com power management ez1580/ez1581 ez1582/ez1583 the ez158x is a low dropout regulator designed to power low voltage microcontrollers, graphics ics, sound cards etc. the dropout voltage is minimized by utilizing a separate input voltage, v ctl , which should exceed v out by at least 1.3v. the 2.5v (for example) power for the load can be derived from a 3.3v system supply. since the efficiency of a linear regulator is the ratio of the output to the input voltage, heat dissipation is reduced by using a 3.3v input (versus a 5v one), thereby lowering heatsink and cooling applications information fan costs. for lower current applications, the heatsink might be eliminated altogether. for a load of 7a at 2.5v, the regulator would dissipate 17.5w when converting from 5v, but only 5.6w from a 3.3v input. remote kelvin sensing of the output voltage can be achieved by connecting the sense pin to the output at the load. remote sensing will reduce errors associated with resistive trace losses between regulator and processor. outline drawing - to-263-5 outline drawing - to-220-5
6 ? 2005 semtech corp. www.semtech.com ez1580/ez1581 ez1582/ez1583 power management minimum land pattern - to-263-5 h c n a r b n a w i a t 0 8 3 3 - 8 4 7 2 - 2 - 6 8 8 : l e t fx a0 9 3 3 - 8 4 7 2 - 2 - 6 8 8 : h b m g d n a l r e z t i w s h c e t m e s h c n a r b n a p a j 0 5 9 0 - 8 0 4 6 - 3 - 1 8 : l e t 1 5 9 0 - 8 0 4 6 - 3 - 1 8 : x a f h c n a r b a e r o k tl e7 7 3 4 - 7 2 5 - 2 - 2 8 : f6 7 3 4 - 7 2 5 - 2 - 2 8 : x a ) . k . u ( d e t i m i l h c e t m e s 0 0 6 - 7 2 5 - 4 9 7 1 - 4 4 : l e t 1 0 6 - 7 2 5 - 4 9 7 1 - 4 4 : x a f e c i f f o i a h g n a h s t0 3 8 0 - 1 9 3 6 - 1 2 - 6 8 : l e 1 3 8 0 - 1 9 3 6 - 1 2 - 6 8 : x a f l r a s e c n a r f h c e t m e s 0 0 - 2 2 - 8 2 - 9 6 1 ) 0 ( - 3 3 : l e t 8 9 - 2 1 - 8 2 - 9 6 1 ) 0 ( - 3 3 : x a f f o y r a i d i s b u s d e n w o - y l l o h w a s i g a l a n o i t a n r e t n i h c e t m e s . a . s . u e h t n i s r e t r a u q d a e h s t i s a h h c i h w , n o i t a r o p r o c h c e t m e s h b m g y n a m r e g h c e t m e s 3 2 1 - 0 4 1 - 1 6 1 8 ) 0 ( - 9 4 : l e t 4 2 1 - 0 4 1 - 1 6 1 8 ) 0 ( - 9 4 : x a f contact information for semtech international ag
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