1 www.semtech.com sc1541 1.0a low dropout voltage regulator with enable power management revision: february 11, 2004 the sc1541 is a high performance low dropout positive voltage regulator designed for use in applications where power management is critical, such as battery powered systems. additionally, the sc1541 provides excellent regulation over variations in line, load and temperature. outstanding features include low dropout performance at rated current, fast transient response, internal current limiting and thermal shutdown protection of the output device. a very low quiescent current of 10a in shutdown mode reduces power dissipation. the sc1541 is available with three different voltage options as standard and two package options, so-8 and 5-lead to-263. ? low voltage microcontrollers ? switching power supply post-regulation ? instantly available circuits ? motherboards ? battery operated equipment ? low dropout performance, 1.3v max ? full current rating over line and temperature ? fast transient response ? +2% total output regulation over line, load and temperature ? 10a max. quiescent current in shutdown ? three fixed output voltages ? line regulation 0.2% max. ? load regulation 0.4% max. ? so-8 and to-263 packages v v enable signal u1 sc1541 in en gnd out c2 10uf min. c1 10uf tantalum tantalum in out notes: (1) input and output capacitors should be located close to the device. (2) connect all pins to pcb (so-8 package) for optimal thermal characteristics. (3) increasing the output capacitor value will improve the overall transient response. (4) the device is enabled when v en = v in , and shut down when en is pulled to ground. en should not be taken higher than v in . a cmos signal referenced to v in would be ideal for switching the sc1541 on and off. description features applications typical application circuit
2 ? 2004 semtech corp. www.semtech.com sc1541 power management r e t e m a r a p l o b m y sm u m i x a ms t i n u e g a t l o v n i p t u p n i m u m i x a m v n i v , n e 7v n o i t a p i s s i d r e w o p p d d e t i m i l y l l a n r e t n iw 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 8 - o s 3 6 2 - o t c j 9 3 3 w / c 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 8 - o s ) 1 ( 3 6 2 - o t a j 5 6 0 6 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 o t 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 s t 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 l t d a e l 0 0 3c r e t e m a r a pl o b m y sn i mp y tx a ms t i n u e g a t l o v t u p t u o ) 1 ( v t u o v n i i , v 5 = t u o a m 0 =1 -v t u o 1 +% 2 -2 + n o i t a l u g e r e n i l ) 1 ( g e r ) e n i l ( i t u o a m 0 1 =5 3 0 . 0 2 . 0 % n o i t a l u g e r d a o l ) 1 ( g e r ) d a o l ( v n i v 5 =2 . 0 4 . 0 % e g a t l o v t u o p o r d ) 2 ( ) 1 ( v d i t u o a 1 =0 1 . 1 0 3 . 1 v t i m i l t n e r r u c ) 1 ( i l c 1 . 1 a t n e r r u c t n e c s e i u qi q v n i v = n e v 5 =57a m 0 1 v n i v , v 5 = n e v 5 2 . 0 <68a 0 1 e g a t l o v l o r t n o c n i p e l b a n ev n e f f o e c i v e d 5 2 . 0 5 4 . 0v n o e c i v e dv ( t u o ) 5 . 0 + v ( t u o ) 8 . 0 + t n e r r u c n i p e l b a n ei n e v n e v , v 0 = n i ) f f o ( v 5 =1 . 0 0 . 1 a v n e v = n i ) n o ( v 5 =5 1 5 2 note: (1) 1 inch square of 1/16? fr-4, double sided, 1 oz. minimum copper weight. unless otherwise specified: i o = 0ma to 1a, v en = v in , 1.8v option: v in = 3.2v to 7.0v, 2.5 option: v in = 3.9v to 7.0v, 3.3v option: v in = 4.7v to 7.0v. values in bold apply over full operating temperature range. absolute maximum ratings electrical characteristics exceeding the specifications below may result in permanent damage to the device, or device malfunction. operation outside of th e parameters specified in the electrical characteristics section is not implied.
3 ? 2004 semtech corp. www.semtech.com sc1541 power management preliminary unless otherwise specified: i o = 0ma to 1a, v en = v in , 1.8v option: v in = 3.2v to 7.0v, 2.5 option: v in = 3.9v to 7.0v, 3.3v option: v in = 4.7v to 7.0v. values in bold apply over full operating temperature range. electrical characteristics (cont.) r e t e m a r a pl o b m y sn i mp y tx a ms t i n u t n e i c i f f e o c e r u t a r e p m e tt c 5 0 0 . 0 c / % y t i l i b a t s e r u t a r e p m e tt s 5 . 0 % e s i o n t u p t u o s m r ) 3 ( v n 3 0 0 . 0v % t u o o i t a r n o i t c e j e r e l p p i r ) 4 ( r a v n i v 5 = 0 6 2 7 b d notes: (1) low duty cycle pulse testing with kelvin connections required. (2) ? v out , ? v ref = 1%. (3) bandwidth of 10 hz to 10khz. (4) 120hz input ripple. (5) this device is esd sensitive. use of standard esd handling precautions is required.
4 ? 2004 semtech corp. www.semtech.com sc1541 power management notes: (1) where x.x denotes voltage options. available voltages are: 1.8v, 2.5v and 3.3v. contact factory for additional voltage options. (2) only available in tape and reel packaging. a reel contains 800 (to-263-5) or 2500 (so-8) devices. (3) lead free product. e c i v e d ) 2 ( ) 1 ( e g a k c a p r t . x . x - m c 1 4 5 1 c s 5 - 3 6 2 - o t t r t . x . x - m c 1 4 5 1 c s ) 3 ( r t . x . x - s c 1 4 5 1 c s 8 - o s t r t . x . x - s c 1 4 5 1 c s ) 3 ( n i pn o i t c n u f 1n e 2d n g b a t / 3t u o 4n i 5c n to-263-5 so-8 pin configurations ordering information block diagram e m a n n i p# n i p 8 - o s# n i p 5 - 3 6 2 - o tn o i t c n u f n i p n e1 1 v o t t c e n n o c . t u p t u o r o t a l u g e r e h t r o f e l b a n e h g i h e v i t c a n i . d e s u g n i e b t o n f i d n g2 2 . n i a h c r o t s i s e r k c a b d e e f l a n r e t n i e h t f o d n e m o t t o b . n i p d n u o r g c n4 5 . n o i t c e n n o c o n n i3 4 . e c i v e d e h t r o f n i p y l p p u s t u p n i e h t s i s i h t t u o8 , 7 , 6 , 5b a t / 3 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 . e g a k c a p 5 - 3 6 2 - o t e h t f o b a t e h t pin descriptions
5 ? 2004 semtech corp. www.semtech.com sc1541 power management note: (1) more copper area should be used to lower r th(j-a) as needed. outline drawing - so-8 land pattern - so-8 (1)
6 ? 2004 semtech corp. www.semtech.com sc1541 power management note: (1) more copper area should be used to lower r th(j-a) as needed. outline drawing - to-263-5l land pattern - to-263-5l (1) semtech corporation power management products division 200 flynn road, camarillo, ca 93012 phone: (805)498-2111 fax (805)498-3804 contact information
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