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1 www.semtech.com sc1566 very low dropout 3.0 amp regulator with enable power management vin enable vo = see equation below c1 c2 r1 r2 u1 sc1566i5t-2.5 1 2 3 4 5 vin en gnd adj vo vin enable vo = 2.5v c1 c2 u1 sc1566i5t-2.5 1 2 3 4 5 vin en gnd adj vo vin vo = 1.8v c1 c2 u1 sc1566it-1.8 1 2 3 vin gnd vo revision: april 27, 2005 the sc1566 is a high performance positive voltage regulator designed for use in applications requiring very low dropout voltage at up to 3 amps. since it has superior dropout characteristics compared to regular ldos, it can be used to supply 2.5v on motherboards or 2.8v on peripheral cards from the 3.3v supply thus allowing heat sink size reduction or elimination. additionally, the five pin versions of sc1566 have an enable pin, to further reduce power dissipation while shut down. the sc1566 provides excellent regulation over variations in line, load and temperature. the sc1566 is available as three terminal fixed output voltage and five terminal fixed or adjustable output voltage devices with enable. two package options are available: to-263 and to-220. ? 350mv dropout @ 3a ? adjustable output from 1.2v to 4.8v ? 2.5v and 1.8v options (5 pin parts also adjustable externally using resistors) ? over current and over temperature protection ? enable pin ? 10a quiescent current in shutdown ? low reverse leakage (output to input) ? full industrial temperature range ? to-220 and to-263 packages ? battery powered systems ? motherboards and notebook computers ? peripheral cards ? network cards ? set top boxes ? medical equipment volts r2 r2) (r1 1.200 vo + = features description applications typical application circuits (1)(2) notes: (1) maximum vo setpoint for 1.8v parts = 5.4v (2) this device is designed to operate with ceramic input and output capacitors
2 ? 2005 semtech corp. www.semtech.com sc1566 power management r e t e m a r a p l o b m y sx a ms t i n u e g a t l o v t u p n i v n i 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 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 x - 3 6 2 - o t x - 0 2 2 - o t a j 0 6 0 5 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 x - 3 6 2 - o t x - 0 2 2 - o t c j 3 3 w / c e g n a r e r u t a r e p m e t t n e i b m a g n i t a r e p o t a 5 8 + o t 0 4 -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 0 5 1 + o t 0 4 -c 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 ) l e d o m y d o b n a m u h ( g n i t a r d s e v d s e 2v k 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 n i v e g n a r e g a t l o v y l p p u sv n i 2 . 25 . 5 v t n e r r u c t n e c s e i u qi q v n i v 3 . 3 =5 7 . 0 5 7 . 1 a m v n i v , v 5 . 5 = n e v 0 =0 1 5 3 a o v e g a t l o v t u p t u o ) 1 ( v o v n i v = o i , v 7 . 0 + o a m 0 1 =% 1 -v o % 1 +v ) e g a t l o v d e x i f l a n r e t n i ( % 2 -% 2 + n o i t a l u g e r e n i l ) 1 ( g e r ) e n i l ( v n i v ( = o i , v 5 . 5 o t ) v 5 2 . 0 + t u o a m 0 1 =5 3 0 . 0 3 . 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 = o v 7 . 0 +2 . 0 4 . 0 % e g a t l o v t u o p o r d ) 2 ( ) 1 ( v d i o a m 0 1 =15v m 0 1 i o a m 0 0 5 =5 70 0 1v m 0 5 1 absolute maximum ratings electrical characteristics unless specified: v en = v in . adjustable option (v adj > v th(adj) ): v in = 2.2v to 5.5v and i o = 10a to 3a. fixed options (v adj = gnd): v in = (v o + 0.7v) to 5.5v and i o = 0a to 3a. values in bold apply over the full operating temperature range. 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 ? 2005 semtech corp. www.semtech.com sc1566 power management notes: (1) low duty cycle pulse testing with kelvin connections required. (2) defined as the input to output differential at which the output voltage drops to 1% below the value measured at a differential of 0.7v. (3) required to maintain regulation. voltage set resistors r1 and r2 are usually utilized to meet this requirement. adjustable versions only. (4) guaranteed by design. (5) when v adj exceeds this threshold, the ?sense select? switch disconnects the internal feedback chain from the error amplifier and connects v adj instead. 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 o c ( o v e g a t l o v t u o p o r d ) 2 ( ) 1 ( i o a 5 . 1 =0 0 20 0 3v m 0 0 4 i o a 3 =0 5 30 5 4v m 0 0 6 t n e r r u c d a o l m u m i n i m ) 3 ( i o v n i v = o v 7 . 0 +1 0 1 a t i m i l t n e r r u ci l c 0 . 3 5 . 4 5 . 6 a j d a e g a t l o v e c n e r e f e r ) 1 ( v f e r v n i v , v 2 . 2 = j d a v = t u o i , o a m 0 1 =8 8 1 . 10 0 2 . 12 1 2 . 1v 6 7 1 . 14 2 2 . 1 t n e r r u c n i p t s u j d a ) 4 ( i j d a v j d a v = f e r 0 1 0 0 2 a n d l o h s e r h t n i p t s u j d a ) 5 ( v ) j d a ( h t 0 1 . 0 0 2 . 0 0 4 . 0 v n e 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 v 3 . 3 =5 . 1 0 1 a d l o h s e r h t n i p e l b a n ev h i v n i v 3 . 3 = 8 . 1 v v l i v n i v 3 . 3 = 4 . 0 n o i t c e t o r p e r u t a r e p m e t r e v o l e v e l p i r t h g i ht i h 5 7 1c s i s e r e t s y ht t s y h 0 1c electrical characteristics (cont.) unless specified: v en = v in . adjustable option (v adj > v th(adj) ): v in = 2.2v to 5.5v and i o = 10a to 3a. fixed options (v adj = gnd): v in = (v o + 0.7v) to 5.5v and i o = 0a to 3a. values in bold apply over the full operating temperature range.
4 ? 2005 semtech corp. www.semtech.com sc1566 power management pin descriptions pin configurations note: (1) 3-pin versions are fixed output voltage only. n i p - 5 6 6 5 1 c s s n o i s r e v n i pn o i t c n u f 1n i v 2n e 3d n g 4j d a 5o v d n g s i b a t ordering information to-263-5 to-220-5 to-263-3 n i p - 3 6 6 5 1 c s s n o i s r e v n i pn o i t c n u f 1n i v 2d n g 3o v d n g s i b a t to-220-3 notes: (1) where -x.x denotes voltage options. available voltages are: 2.5v and 1.8v. (2) output voltage can be adjusted using external resistors, see pin descriptions below. (3) only available in tape and reel packaging. a reel contains 800 devices. (4) only available in tube packaging. a tube contains 50 devices. (5) t-xx = straight in-line; t-xx-sb = single bend. (6) lead free product. this product is fully weee and rohs compliant. e c i v e d ) 1 ( e g a k c a p r t . x . x - m i 6 6 5 1 c s 3 - 3 6 2 - o t ) 3 ( t r t x . x - m i 6 6 5 1 c s ) 6 ( r t . x . x - m 5 i 6 6 5 1 c s ) 2 ( 5 - 3 6 2 - o t ) 3 ( t r t x . x m 5 i 6 6 5 1 c s ) 6 ( ) 2 ( x . x - t i 6 6 5 1 c s 3 - 0 2 2 - o t ) 4 ( t x . x - t i 6 6 5 1 c s ) 6 ( x . x - t 5 i 6 6 5 1 c s ) 5 ( ) 2 ( 5 - 0 2 2 - o t ) 4 ( t x . x t 5 i 6 6 5 1 c s ) 6 ( ) 5 ( ) 2 ( b s x . x - t 5 i 6 6 5 1 c s ) 5 ( ) 2 ( 5 - 0 2 2 - o t ) 4 ( t b s x . x t 5 i 6 6 5 1 c s ) 6 ( ) 5 ( ) 2 ( e m a n n i pn o i t p i c s e d n i p j d a l a n r e t x e f i . s 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 y b t e s t a h t o t e g a t l o v t u p t u o e h t s t e s , d e d n u o r g n e h w , n i p s i h t : ) 1 e g a p n o s t i u c r i c n o i t a c i l p p a e e s ( e b l l i w e g a t l o v t u p t u o e h t , d e s u e r a s r o t s i s e r k c a b d e e f n e f o n o i t c a r f a o t t n e r r u c t n e c s e i u q e h t g n i c u d e r , f f o r o t a l u g e r e h t s n r u t v 4 . 0 w o l e b n i p s i h t g n i l l u p . t u p n i e l b a n e . d e s u g n i e b t o n f i n i v o t t c e n n o c . n e p o t f e l s i n i p s i h t f i d e l b a n e e b l l i w e c i v e d e h t . e u l a v g n i t a r e p o s t i d n g . g n i k n i s t a e h r o f ) d n g o t d e t c e n n o c y l l a c i r t c e l e ( b a t e h t e s u . d n u o r g e c n e r e f e r n i v m u m i n i m . v 5 . 5 d n a ) v 7 . 0 + o v ( n e e w t e b e b t s u m n i p s i h t o t t u p n i e h t , d a o l l l u f t a n o i t a l u g e r r o f . e g a t l o v t u p n i . v 2 . 2 = n i v o v. 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 n i p s i h t volts r2 r2) (r1 1.200 vo + =
5 ? 2005 semtech corp. www.semtech.com sc1566 power management block diagram * 5 lead versions only
6 ? 2005 semtech corp. www.semtech.com sc1566 power management typical characteristics dropout voltage vs. output current vs. junction temperature dropout voltage vs. junction temperature vs. output current output voltage (2.5v) vs. junction temperature vs. output current output voltage (2.5v) vs. junction temperature vs. output current reference voltage vs. junction temperature vs. output current reference voltage vs. junction temperature vs. output current 0 50 100 150 200 250 300 350 400 450 500 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 i o (a) v d (mv) 0c -40c 150c 25c 0 50 100 150 200 250 300 350 400 450 500 -50 -25 0 25 50 75 100 125 150 t j (c) v d (mv) i o = 0.5a i o = 1.5a i o = 3a 2.450 2.460 2.470 2.480 2.490 2.500 2.510 2.520 2.530 2.540 2.550 -50 -25 0 25 50 75 100 125 150 t j (c) vo (v) i o = 3a i o = 10ma vin = 3.2v 2.450 2.460 2.470 2.480 2.490 2.500 2.510 2.520 2.530 2.540 2.550 -50 -25 0 25 50 75 100 125 150 t j (c) vo (v) i o = 3a i o = 10ma vin = 5.5v 1.175 1.180 1.185 1.190 1.195 1.200 1.205 1.210 1.215 1.220 1.225 -50 -25 0 25 50 75 100 125 150 t j (c) v ref (v) vin = 2.2v i o = 10ma i o = 3a 1.175 1.180 1.185 1.190 1.195 1.200 1.205 1.210 1.215 1.220 1.225 -50 -25 0 25 50 75 100 125 150 t j (c) v ref (v) vin = 5.5v i o = 10ma i o = 3a
7 ? 2005 semtech corp. www.semtech.com sc1566 power management introduction the sc1566 is intended for applications such as graphics cards where high current capability and very low dropout voltage are required. it provides a very simple, low cost solution that uses very little pcb real estate and typically does not require a heatsink. additional features include an enable pin to allow for a very low power consumption standby mode, and a fully adjustable output (5-pin versions). component selection input capacitor: a 4.7f or 10f ceramic capacitor is recommended. this allows for the device being some distance from any bulk capacitance on the rail. additionally, input droop due to load transients is reduced, improving load transient response. additional capacitance may be added if required by the application. output capacitor: a minimum bulk capacitance of 2.2f, along with a 0.1f ceramic decoupling capacitor is recommended. increasing the bulk capacitance will improve the overall transient response. the use of multiple lower value ceramic capacitors in parallel to achieve the desired bulk capacitance will not cause stability issues. although designed for use with ceramic output capacitors, the sc1566 is extremely tolerant of output capacitor esr values and thus will also work comfortably with tantalum output capacitors. for refer- ence, the phase-margin contour of figure 1. can be used applications information to choose an appropriate output capacitor for a given stability requirement. noise immunity: in very electrically noisy environments, it is recommended that 0.1f ceramic capacitors be placed from in to gnd and out to gnd as close to the device pins as possible. external voltage selection resistors (5-pin parts): the use of 1% resistors, and designing for a current flow 10?a is recommended to ensure a well regulated output (thus r2 120k ? ). thermal considerations the power dissipation in the sc1566 is approximately equal to the product of the output current and the input to output voltage differential: () o d i vout vin p ? ? the absolute worst-case dissipation is given by: () ) max ( q ) max ( ) max ( o ) min ( ) max ( ) max ( d i vin i vout vin p ? + ? ? = for a typical scenario, v in = 3.3v 5%, v out = 2.8v and i o = 2.5a, therefore: v in(max) = 3.465v, v out(min) = 2.744v and i q(max) = 1.75ma, thus p d(max) = 1.81w. typical characteristics (cont.) quiescent current vs. junction temperature off-state quiescent current vs. junction temperature 600 610 620 630 640 650 660 670 680 690 700 -50 -25 0 25 50 75 100 125 150 t j (c) i q (a) vin = 3.3v 0 2 4 6 8 10 12 -50 -25 0 25 50 75 100 125 150 t j (c) i q(off) (a) vin = 5.5v
8 ? 2005 semtech corp. www.semtech.com sc1566 power management using this figure, and assuming t a(max) = 85c, we can calculate the maximum thermal impedance allowable to maintain t j 150c (see page 7): () () w / c 33 r therefore , w / c 0 r and w / c 3 r w / c 36 81 . 1 85 150 p t t r ) max )( a s ( th ) s c ( th ) max )( c j ( th ) max ( d ) max ( a ) max ( j ) max )( a j ( th = = = = ? = ? = ? ? ? ? applications information (cont.) this should be achievable for the to-263 package using pcb copper area to aid in conducting the heat away from the device, such as a large (~2 squ. inch) pad connected to the tab of the device. internal ground/power planes and air flow will also assist in removing heat. for higher power dissipations it may be necessary to use a small heatsink and the to-220 package. figure 1. phase-margin contour plot 0.001 0.01 0.1 1 10 3a 300ma 30ma 3ma esr(ohms) load co=2.2uf, stable region: unstable region: 0.001 0.01 0.1 1 10 3a 300ma 30ma 3ma esr(ohms) load co=220uf, stable region: unstable region: 0.001 0.01 0.1 1 10 3a 300ma 30ma 3ma esr(ohms) load co=22uf, stable region: unstable region:
9 ? 2005 semtech corp. www.semtech.com sc1566 power management outline drawing - t0-263-3 minimum land pattern - to-263-3
10 ? 2005 semtech corp. www.semtech.com sc1566 power management outline drawing - to-263-5 minimum land pattern - to-263-5
11 ? 2005 semtech corp. www.semtech.com sc1566 power management outline drawing - to-220-3 outline drawing - to-220-5
12 ? 2005 semtech corp. www.semtech.com sc1566 power management contact information semtech corporation power management products division 200 flynn road, camarillo, ca 93012 phone: (805)498-2111 fax (805)498-3804 outline drawing - to-220-5 (t-xx-sb option)

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