power management 1 www.semtech.com sc1563 very low dropout, low quiescent 500ma regulator revision: january 11, 2006 the sc1563 is a high performance positive voltage regulator designed for use in applications requiring very low dropout voltage at up to 500ma. since it has supe- rior 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 with no heatsink. additionally, the sc1563 has a shutdown pin to further reduce power dissipation while shut down. the sc1563 provides excellent regulation over variations in line, load and temperature. a wide range of fixed output voltage options are avail- able. in addition, the output voltage of every device can be adjusted between 1.2v and 4.8v using external resis- tors. the sc1563 comes in the space saving 5-pin sot- 23 package. ? 350mv dropout @ 500ma ? designed to operate with ceramic capacitors ? adjustable output from 1.2v to 4.8v ? multiple output voltage options (all parts also adjustable externally using resistors) ? over current and over temperature protection ? 2a quiescent current in shutdown ? no minimum load current requirement ? low reverse leakage (output to input) ? full industrial temperature range ? 5-pin sot-23 surface mount package. also avail- able in lead-free, fully weee and rohs compliant ? personal digital assistants ? battery powered systems ? motherboards ? peripheral cards ? pcmcia cards internally preset output voltage externally set output voltage u1 sc1563is-x.x 1 2 3 4 5 shdn gnd adj out in c2 r2 c2 vin vo (x.xv) vo shdn c1 shdn r1 vin c1 u1 sc1563is-x.x 1 2 3 4 5 shdn gnd adj out in volts r2 r2) (r1 1.200 v out + = description features applications typical application circuits
2 ? 2006 semtech corp. www.semtech.com power management sc1563 r e t e m a r a pl o b m y ss n o i t i d n o cn i mp y tx a ms t i n u n i e g n a r e g a t l o v y l p p u sv n i 2 . 25 . 6 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 8 0 5 1 a v n i v , v 5 . 6 = n d h s n e p o =1 0 . 0 0 0 . 2 a t u o e g a t l o v t u p t u o ) 1 ( v t u o v n i v = t u o i , v 7 . 0 + t u o a m 0 1 =% 1 -v t u 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 ( = t u o i , v 5 . 5 o t ) v 5 2 . 0 + t u o a m 0 1 =1 . 0 4 . 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 = t u o v 7 . 0 +5 1 . 0 0 4 . 0 % unless specified: v shdn = 0v, adjustable mode (v adj > v th(adj) ): v in = 2.2v to 5.5v and i out = 0a to 500ma, fixed mode (v adj = gnd): v in = (v out + 0.7v) to 5.5v and i out = 0a to 500ma. values in bold apply over full operating temperature range. 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 iv n i 7 o t 3 . 0 -v e g a t l o v n w o d t u h sv n d h s v o t 3 . 0 - n i v 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 ) 1 ( a j 5 7 1w / c g n i t a r e p ot n e i b m ae g n a r e r u t a r e p m e tt a 5 8 o t 0 4 -c g n i t a r e p on o i t c n u je g n a r e r u t a r e p m e tt j 4 -0 5 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 g n i t a r d s ev d s e 2v k absolute maximum ratings note: (1) minimum pad size. 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 ? 2006 semtech corp. www.semtech.com power management sc1563 r e t e m a r a pl o b m y ss n o i t i d n o cn i mp y tx a ms t i n u ) . t n o c ( t u o e g a t l o v t u o p o r d ) 2 ( ) 1 ( v d i t u o a m 2 =15v m 0 1 i t u o a m 0 0 1 =0 70 0 1v m 0 5 1 i t u o a m 0 5 2 =5 7 10 5 2v m 0 5 3 i t u o a m 0 0 5 =0 5 30 0 5v m 0 0 7 t i m i l t n e r r u c i m i l 5 . 00 . 1 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 , t u o a m 0 1 =8 8 1 . 10 0 2 . 12 1 2 . 1v 6 7 1 . 14 2 2 . 1 n e r r u c n i p t s u j d at ) 3 ( i j d a v j d a v = f e r 5 6 0 5 1 a n d l o h s e r h t n i p t s u j d a ) 4 ( v ) j d a ( h t 0 1 . 0 5 2 . 0 0 4 . 0 v n d h s t n e r r u c n i p n w o d t u h si n d h s v n d h s v , v 0 = n i v 3 . 3 =5 . 1 0 . 5 a d l o h s e r h t n i p n w o d t u h sv 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 0 7 1c s i s e r e t s y ht t s y h 0 1c 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 for 2.5v v out 3.4v. not measurable on outputs less than 2.2v due to minimum v in con- straints. see typical characteristics curves. (3) guaranteed by design. (4) when v adj exceeds this threshold, the ?sense select? switch disconnects the internal feedback chain from the error amplifier and connects v adj instead. unless specified: v shdn = 0v, adjustable mode (v adj > v th(adj) ): v in = 2.2v to 5.5v and i out = 0a to 500ma, fixed mode (v adj = gnd): v in = (v out + 0.7v) to 5.5v and i out = 0a to 500ma. values in bold apply over full operating temperature range. electrical characteristics
4 ? 2006 semtech corp. www.semtech.com power management sc1563 top view sot-23-5 r e b m u n t r a p ) 3 ( ) 2 ( ) 1 ( e g a k c a p r t x . x - k s i 3 6 5 1 c s 5 - 3 2 - t o s t r t x . x - k s i 3 6 5 1 c s ) 4 ( notes: (1) where -x.x denotes voltage options. available voltages are: 1.8v, 2.5v, 2.8v, 3.0v, 3.1v and 3.3v. (2) output voltage can be adjusted using external resistors, see pin descriptions. (3) only available in tape and reel packaging. a reel contains 3000 devices. (4) lead free product. this product is fully weee and rohs compliant. pin configurations ordering information marking information sot-23-5 63xx = sc1563, voltage option (example: 6318 for 1.8v option) yyww = date code (example: 0008 for week 8 of 2000)
5 ? 2006 semtech corp. www.semtech.com power management sc1563 # n i pe m a n n i pn o i t c n u f n i p 1n d h s 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 n e p o n i p s i h t g n i v a e l . t u p n i n w o d t u h s w o l e b d e l l u p 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 . ) a n 0 0 3 < y l l a c i p y t ( e u l a v g n i t a r e p o s t i f o n o i t c a r f . d e s u g n i e b t o n f i d n g o t t c e n n o c . v 4 . 0 2d n g . s e s o p r u p g n i k n i s t a e h r o f d e s u e b y a m n i p s i h t . d n u o r g e c n e r e f e r 3j d a 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 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 l a n r e t x e 4t u o. a m 0 0 5 o t p u g n i c r u o s , e c i v e d s i 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 5n i 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 t u o . v 5 . 6 d n a ) v 7 . 0 + v m u m i n i m n i . v 2 . 2 = volts r2 r2) (r1 1.200 v out + = block diagram pin descriptions
6 ? 2006 semtech corp. www.semtech.com power management sc1563 introduction the sc1563 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 little pcb real estate. additional features include a shutdown pin to allow for a very low power consumption standby mode, and a fully adjustable output. component selection input capacitor - a 1f 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 1f, 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 sc1563 is extremely tolerant of output capacitor esr values and thus will also work comfortably with tantalum output capacitors. 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 - the use of 1% resistors, and designing for a current flow 10a is recommended to ensure a well regulated output (thus r2 120k ? ). thermal considerations the power dissipation in the sc1563 is approximately equal to the product of the output current and the input to output voltage differential: () out out in d i v v p ? ? the absolute worst-case dissipation is given by: () ) max ( q ) max ( in ) max ( out ) min ( out ) max ( in ) max ( d i v i v v p ? + ? ? = for a typical scenario, v in = 3.3v 5%, v out = 2.5v and i out = 500ma, therefore: v in(max) = 3.465v, v out(min) = 2.450v and i q(max) = 150a, thus p d(max) = 0.508w. using this figure, and assuming t a(max) = 70c, we can calculate the maximum thermal impedance allowable to maintain t j 150c: () () w / c 157 508 . 0 70 150 p t t r ) max ( d ) max ( a ) max ( j ) max )( a j ( th = ? = ? = ? this should be achievable with the sot-23-5 package using pcb copper area to aid in conducting the heat away from the device. internal ground/power planes and air flow will also assist in removing heat. applications information
7 ? 2006 semtech corp. www.semtech.com power management sc1563 quiescent current vs. junction temperature vs. output current quiescent current vs. input voltage vs. output current typical characteristics output voltage vs. junction temperature vs. output current line regulation vs. junction temperature vs. input voltage change 0 25 50 75 100 125 150 -50 -25 0 25 50 75 100 125 150 t j (c) i q (a) v in = 3.3v, v adj = v out i out = 500ma i out = 0ma load regulation vs. junction temperature -0.5 -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 -50 -25 0 25 50 75 100 125 150 t j (c) v out deviation (%v out(nom) ) v in = v out(nom) + 0.7v i out = 500ma i out = 0ma 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 -50 -25 0 25 50 75 100 125 150 t j (c) reg line (%v out(nom) ) v in = (v out(nom) + 0.25v) to 5.5v i out = 10ma 10 100 1000 10000 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 v in (v) i q (a) v adj = v out i out = 500ma i out = 0ma dropout voltage (i out = 0.5a) vs. output voltage vs. junction temperature 0 100 200 300 400 500 600 700 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4 4.6 v out (v) v d (mv) t j = 150c t j = 25c t j = -40c 0.00 0.02 0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.18 0.20 -50 -25 0 25 50 75 100 125 150 t j (c) reg load (%v out(nom) ) v in = v out(nom) + 0.7v i out = 0ma to 500ma
8 ? 2006 semtech corp. www.semtech.com power management sc1563 dropout voltage (i out = 0.25a) vs. output voltage vs. junction temperature typical characteristics (cont.) dropout voltage (i out = 0.1a) vs. output voltage vs. junction temperature reference voltage (v in = 2.2v) vs. junction temperature vs. output current reference voltage (v in = 5.5v) vs. junction temperature vs. output current adjust pin current vs. junction temperature current limit vs. junction temperature 0 50 100 150 200 250 300 350 400 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4 4.6 v out (v) v d (mv) t j = 150c t j = 25c t j = -40c 0 25 50 75 100 125 150 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4 4.6 v out (v) v d (mv) t j = 150c t j = 25c t j = -40c 500 550 600 650 700 750 800 850 900 950 1000 -50 -25 0 25 50 75 100 125 150 t j (c) i lim (ma) v in = v out(nom) + 0.7v 1.195 1.196 1.197 1.198 1.199 1.200 1.201 1.202 1.203 1.204 1.205 -50 -25 0 25 50 75 100 125 150 t j (c) v ref (v) v in = 2.2v i out = 0ma i out = 500ma 1.190 1.192 1.194 1.196 1.198 1.200 1.202 1.204 1.206 1.208 1.210 -50 -25 0 25 50 75 100 125 150 t j (c) v ref (v) v in = 5.5v i out = 0ma i out = 500ma 0 10 20 30 40 50 60 70 80 90 100 -50 -25 0 25 50 75 100 125 150 t j (c) i adj (na) v in = 6.5v v adj = v ref
9 ? 2006 semtech corp. www.semtech.com power management sc1563 adjust pin threshold voltage vs. junction temperature typical characteristics (cont.) shutdown pin current vs. junction temperature shutdown pin threshold voltage vs. junction temperature vs. input voltage 100 125 150 175 200 225 250 275 300 325 350 375 400 -50 -25 0 25 50 75 100 125 150 t j (c) v th(adj) (mv) 2.2v v in 6.5v 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 -50 -25 0 25 50 75 100 125 150 t j (c) i shdn (a) v in = 3.3v v shdn = 0v 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 -50 -25 0 25 50 75 100 125 150 t j (c) v ih , v il (v) v ih , v in = 6.5v v il , v in = 6.5v v ih , v in = 2.2v v il , v in = 2.2v
10 ? 2006 semtech corp. www.semtech.com power management sc1563 outline drawing - sot-23-5 land pattern - sot-23-5 semtech corporation power management products division 200 flynn road, camarillo, ca 93012 phone: (805)498-2111 fax (805)498-3804 contact information .110 bsc .037 bsc detail aaa c seating plane c ccc 2x n/2 tips 2x e/2 5 see detail a1 a a2 bxn d a .008 12 n e1 e d .060 .114 .063 .118 .010 - 5 a 0.20 1.60 3.00 2.80 bsc 0.95 bsc .069 1.50 2.90 .020 0.25 1.75 0.50 - ei l (l1) c 01 0.25 plane gage h 2.80 .110 bbb c a-b d a b e 0 .008 - .004 .012 .003 (.024) .018 - .035 .000 .035 - - .045 0.10 0.20 10 0 - 10 1.15 (0.60) 0.45 .024 .009 0.30 0.08 .057 .051 .006 0.00 .90 0.90 0.22 0.60 - 0.15 1.45 1.30 - - 1.90 bsc .075 bsc dimensions "e1" and "d" do not include mold flash, protrusions datums and to be determined at datum plane or gate burrs. controlling dimensions are in millimeters (angles in degrees). notes: 1. 3. 2. -a- -b- -h- dimensions inches l1 aaa bbb ccc 01 n dim e e1 l e e1 c d a a2 b a1 min nom millimeters nom max min max side view dimensions inches y z dim g p x c millimeters p (c) z y g .043 .141 .055 (.098) .037 .024 1.40 (2.50) 0.95 0.60 1.10 3.60 x dimensions inches y z dim g p x c millimeters this land pattern is for reference purposes only. consult your manufacturing group to ensure your company's manufacturing guidelines are met. notes: 1.
|
