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power management 1 www.semtech.com sc1116 linear fet controller for ddr supplies features revision: march 28, 2007 description the sc1116 is a low cost controller for low power linear ddr power supplies. the sc1116 comes in a space saving sot-23 6 pin package. the sc1116 provides a dual gate drive for the top serial and bottom parallel mosfets with internal shoot through protection. the wide range of input voltages (3v to 15v) allows the chip to work in many various applications. the variable output voltage is programmable from the outside with an input divider or an external reference. wide range of v ddq , down to 0.5v ? ddr supplies ? scsi ? line termination ? source / sink ldos ? user can select fets to optimize system current rating/dropout/cost ? low v ddq , 0.5v to 2.5v ? -40c to +85c operating temperature ? external compensation capable for low esr loads ? minimum external components ? 0.6 ma quiescent current ? guaranteed no shoot through ? sot-23 6l small package. fully weee and rohs compliant typical application circuit applications notes: (1) values used for optional compensation are 1k and 4.7nf typical. (2) when using 3v as vcc, use of low threshold fets is a must. ref 3 drvl 4 vcc 1 fb 5 gnd 2 drvh 6 u1 sc 1 1 16 0.1uf 0.1uf typ 4.7nf typ 4.7nf typ 47uf r1 1k 0.5% r2 1k 0.5% typ 1k typ 1k q1 mos fet n q2 mos fet n vddq=2.5vtyp vcc=3 to 15v vtt=1.25vtyp gnd
2 ? 2007 semtech corp. www.semtech.com power management sc1116 electricial characteristics r e t e m a r a ps 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 y l p p u s 35 1v n o i t a l u g e r d a o l ) 1 ( a 3 + 0 : l i a 3 - 0 : l i 1 - 1 + % t n e r r u c y b d n a t s / t n e r r u c t n e c s e i u qv c c a 0 = d a o l o n , v 5 1 =0 0 6 0 0 8 a t n e r r u c t u p n i f e r & b fv c c v 5 1 =0 0 1a n e v i r d e t a g w o l t u p t u oi k n i s a m 5 . 2 =5 1 . 0 5 2 . 0 v h g i h t u p t u oi e c r u o s a m 5 . 2 = 5 2 . 0 - c c v 5 1 . 0 - c c vv 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 y l p p u s t u p n iv c c 5 . 6 1 + o t 3 . 0 -v 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 ot 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 ot j 5 2 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 st g t s 0 5 1 + o t 5 6 -c t n e i b m a o t n o i t c n u j e c n a d e p m i l a m r e h t a j 7 . 5 9w / c e s a c o t n o i t c n u j e c n a d e p m i l a m r e h t c j 7 . 1 6w / c t t a n o i t a p i s s i d r e w o p a c 5 2 =p d 0 5 2w m s d n o 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 absolute maximum rating 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. unless otherwise specified, v cc = 5v, 0.5v v ddq 2.5v, r1 = r2 = 1k ? +/- 0.1%. specifications with standard typeface are for t j = 25 c, and limits in boldface type apply over the full operating temperature range (t a = -40 c to +85 c). note: (1) for load regulation testing use a low duty cycle current pulse, when measuring vtt.
3 ? 2007 semtech corp. www.semtech.com power management sc1116 # n i pe m a n n i pn o i t c n u f n i p 1c c v . r o t i c a p a c c i m a r e c f 1 . 0 a h t i w d n u o r g o t e l p u o c e d d n a y l p p u s v 5 1 o t v 3 a t c e n n o c , n i p y l p p u s 2d n g. d n u o r g l a n g i s d n a r e w o p 3f e r. e g a t l o v s i h t o t d e t a l u g e r e b l l i w e g a t l o v t u p t u o . t u p n i e c n e r e f e r 4l v r d. t u p t u o e v i r d t e f e d i s w o l 5b f. n i p k c a b d e e f 6h v r d. t u p t u o e v i r d t e f e d i s h g i h pin descriptions notes: (1) only available in tape and reel packaging. a reel contains 3000 devices. (2) lead free option. fully weee and rohs compliant. r e b m u n t r a pk r a m p o te g a k c a p r t k s i 6 1 1 1 c s ) 1 ( 0 0 h al 6 3 2 - t o s t r t k s i 6 1 1 1 c s ) 2 ( ) 1 ( ordering information pin configuration 3 1 vcc top view (sot-23 6l) 5 fb ref 6 drvh 4 drvl 2 gnd block diagram
4 ? 2007 semtech corp. www.semtech.com power management sc1116 application information overview the sc1116 linear controller is designed to meet the jedec specifications for termination of ddr-sdram. double data rate (ddr) memory is clocked at the same speed as older sdram (synchronous dynamic random access memory), yet handles twice the amount of data by using the rising and falling edge of the clock signal for data transfers. another difference is that ddr memory requires 2.5v instead of 3.3v used by standard sdram. the other feature that separates ddr memory from a conventional type is employment of the v tt ? termination voltage. main requirements for the v tt are that it must track variations of v ddq and be able to supply (source) current, and absorb (sink) current. the sc1116 controller offers a low cost solution for ddr termination voltage regulation by using external pass el- ements (mosfets). having the flexibility of choosing the mosfets allows for optimization on the basis of cost/ size/performance of the specific application. test circuit & waveforms the test circuit is shown below in figure 1. note that v ref voltage is supplied externally to eliminate inaccuracy caused by resistor divider. figure 1. ref 3 drvl 4 vcc 1 fb 5 gnd 2 drvh 6 u1 sc1116 c3 0.1uf c2 1uf c4 4.7nf c5 4.7nf c6 270uf r3 1k r4 1k q1 ir37 14 q2 ir37 14 vtt=1.25vtyp c1 100uf 22m 32m 2xisink isin k po wer electronic current su pply load pu lse load, dc=50% iso urce/ isink probe vddq=2.5v vcc=5v vref=1.25v +/-3a 0a to 6a step 3a isource
5 ? 2007 semtech corp. www.semtech.com power management sc1116 typical characteristics regulation vtt vs. vref @ is/s=1a; vcc=5v -5.0% -4.0% -3.0% -2.0% -1.0% 0.0% 1.0% 2.0% 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 vref (vddq/2), v dvtt / vtt regulation vtt vs. vref @ is/s=5a; vcc=5v -5.0% -4.0% -3.0% -2.0% -1.0% 0.0% 1.0% 2.0% 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 vref (vddq/2), v dvtt / vtt regulation vtt vs. vref @ is/s=1a; vcc=12v -5.0% -4.0% -3.0% -2.0% -1.0% 0.0% 1.0% 2.0% 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 vref (vddq/2), v dvtt / vtt regulation vtt vs. vref @ is/s=5a; vcc=12v -5.0% -4.0% -3.0% -2.0% -1.0% 0.0% 1.0% 2.0% 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 vref (vddq/2), v dvtt / vtt
6 ? 2007 semtech corp. www.semtech.com power management sc1116 typical characteristics (cont.) max. sinking current vs . v cc 3.6 3.7 3.8 3.9 4 4.1 4.2 4.3 4.4 33.544.555.566.5 supply voltage, v cc (v) output current ( a ) v ddq = 2.5v v ref = 1.25v v tt = 1.263v max. sourcing current vs . v cc 0 1 2 3 4 5 6 3 3.5 4 4.5 5 5.5 6 6.5 supply voltage, v cc (v) output current ( a ) v ddq = 2.5v v ref = 1.25v v tt = 1.237v
7 ? 2007 semtech corp. www.semtech.com power management sc1116 typical characteristics (cont.) quiescent current vs . v cc 0 100 200 300 400 500 600 700 800 3 3.5 4 4.5 5 5.5 6 6.5 supply voltage, v cc (v) quiescent current ( ua ) v ddq = 2.5v v ref = 1.25v v tt = 1.25v i load = 0a 25 o c 0 o c 125 o c quiescent current vs. temperature 450 460 470 480 490 500 510 520 -40 -25 -10 5 20 35 50 65 80 95 110 125 tempera ture c quiescent current ( ua v cc = 5v v ddq = 2.5v v ref = 1.25v v tt = 1.25v i load = 0a
8 ? 2007 semtech corp. www.semtech.com power management sc1116 v tt 100mv/div i source / i sink v cc = 5v v ddq = 2.5v v ref = 1.25v time (50us/div) i step : +1.25a to ?1.25a slew rate: 2.5 a/us v tt 100mv/div i source / i sink v cc = 5v v ddq = 2.5v v ref = 1.25v time (50us/div) i step : - 0.75a to + 0.75a slew rate: 2.5 a/us test waveforms v tt 100mv/div time (50us/div) i source / i sink v cc = 5v v ddq = 2.5v v ref = 1.25v i step : +2.3a to - 2.2a slew rate: 2.5 a/us v tt 100mv/div i source / i sink v cc = 5v v ddq = 2.5v v ref = 1.25v time (50us/div) i step : +1.75a to ?1.75a slew rate: 2.5 a/us v tt transient response
9 ? 2007 semtech corp. www.semtech.com power management sc1116 test waveforms (cont.) v tt 100mv/div i source / i sink v cc = 5v v ddq = 2.5v v ref = 1.25v time (50us/div) i step : - 0.53a to + 0.53a slew rate: 2.5 a/us v tt 100mv/div i source / i sink v cc = 5v v ddq = 2.5v v ref = 1.25v c out = 47uf ceramic time (50us/div) i step : - 0.5a to + 0.53a slew rate: 2.5 a/us v tt transient response v tt 20mv/div i source / i sink v cc = 5v v ddq = 2.5v v ref = 1.25v time (20us/div) i step : + 0.03a to + 2.25a slew rate: 2.5 a/us v tt 50mv/div i source / i sink v cc = 5v v ddq = 2.5v v ref = 1.25v time (20us/div) i step : + 0.03a to - 2.25a slew rate: 2.5 a/us
10 ? 2007 semtech corp. www.semtech.com power management sc1116 evaluation board top view top layer evaluation board schematic notes: (1) values used for optional compensation are 1k and 4.7nf typical. (2) when using 3v as vcc, use of low threshold fets is a must. ref 3 drvl 4 vcc 1 fb 5 gnd 2 drvh 6 u1 sc1116 c3 0.1 c2 0.1 c4 4.7nf c5 4.7nf c6 47uf r1 1k 0.5% r2 1k 0.5% r3 1k r4 1k q1 ir3714 q2 ir3714 c1 22uf vtt=1.25vtyp vcc=3 to 15v vddq=2.5vtyp gnd
11 ? 2007 semtech corp. www.semtech.com power management sc1116 outline drawing - sot-23-6 minimum land pattern - sot-23-6 .110 bsc .037 bsc detail aaa c seating ccc c 2x n/2 tips 2x e/2 6 see detail a1 a a2 bxn a .008 12 n e .060 .114 .063 .122 .010 - 6 a 0.20 1.60 3.10 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 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 a e1 d e b c plane d datums and to be determined at datum plane controlling dimensions are in millimeters (angles in degrees). dimensions "e1" and "d" do not include mold flash, protrusions 3. or gate burrs. notes: 1. 2. -a- -b- -h- side view nom inches dimensions l1 aaa bbb ccc 01 n dim c e e1 l e1 e d a1 a2 b a min millimeters max min nom max 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. 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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