power management 1 www.semtech.com SC1214 high speed, combi-sense tm two-phase, synchronous mosfet driver features applications may 9, 2005 the SC1214 is a high speed, combi-sense tm , two-phase driver designed to drive high-side and low-side mosfets in two synchronous buck converters. the driver com- bined with combi-sense pwm controllers, such as semtech sc2643vx or sc2643, provides a cost effec- tive two-phase voltage regulator for advanced micro- processors the combi-sense tm is a technique to sense the inductor current for peak current mode control of voltage regula- tor without using sensing resistor. it provides the follow- ing advantages: - no costly precision sensing resistor - lossless current sensing - high level noise free signal - fast response - suitable for wide range of duty cycle the detailed explanation of the technique can be found in the applications information section. a 30ns max propagation delay from input transition to the gate of the power fet?s guarantees operation at high switching frequencies. internal overlap protection circuit prevents shoot-through from vin to pgnd in the main and synchronous mosfets. the adaptive overlap pro- tection circuit ensures the bottom fet does not turn on until the top fet source has reached 1v, to prevent cross- conduction. high current drive capability allows fast switching, thus reducing switching losses at high (up to 1.5mhz) frequen- cies without causing thermal stress on the driver. under-voltage-lockout and over-temperature shutdown features are included for proper and safe operation. timed latches and improved robustness are built into the housekeeping functions such as the under voltage lockout and adaptive shoot-through protection circuitry to prevent false triggering and to assure safe operation. the SC1214 is offered in a tssop-20 package. high efficiency +12v gate drive voltage high peak drive current adaptive non-overlapping gate drives provide shoot-through protection support combi-sense tm and vid-on-fly operations fast rise and fall times (15ns typical with 3000pf load) ultra-low (<30ns) propagation delay (bg going low) floating top gate drive crowbar function for over voltage protection high frequency (to 1.5 mhz) operation allows use of small inductors and low cost ceramic capacitors under-voltage-lockout low quiescent current intel pentium ? processor power supplies amd athlon tm and amd-k8 tm processor power supplies high current low voltage dc-dc converter s description
2 ? 2005 semtech corp. www.semtech.com power management SC1214 typical application circuit c9 2.2nf r17 offset- u1 SC1214 2 1 3 4 16 15 14 13 5 6 8 10 9 12 7 11 17 18 19 20 tg1 drn1 bst1 co1 vpn1 nc co2 bst2 nc vpn2 vreg2 pgnd bg2 tg2 vin2 drn2 vin1 vreg1 bg1 pgnd r14 1.5k m1 atx12v d1 d1n4148 atx12v + c5 1800uf/16v c13 1nf + c6 1800uf/16v pwrgood (open collector output) r7 0r0 atx12v (open collector/drain input, no pull-up) vin c2 1uf r11 r15 c14 vcc pn2 m3 c16 vpn1 c7 4.7uf/1206 c10 2.2nf vin differential pair for remote sense vin r1 1r0 vid0 l1 640nh 1 2 vpn2 note (2) r8 c11 1uf vout m6 vid2 pn1 vid5 r12 c15 r16 offset+ + cout1 c19 m4 + c4 1800uf/16v m5 c3 1nf l2 1 2 vid4 c1 4.7uf d2 d1n4148 v_core- m7 r18 10 m8 v_core+ note (2) vpn1 c20 0.1uf vin r10 pgnd vrm_en vpn2 r2 100 r5 1r0 c21 4.7uf m2 l3 1 2 c8 4.7uf/1206 c12 4.7uf r3 ir0 u2 sc2642 20 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 os2 os1 bgout errout gndsen fb dacstep vcc vid4 vid3 vid2 vid1 vid0 vid5 pgood oscref agnd out1 out2 outsen r6 100 vid3 r13 c17 rosc1 vout note (1) c18 1uf vid1 pull-up voltage vr10: 2v vrm9.x: 5v k-8: 12v vcc note (1) vout r9 r4 ir0 notes: (1) output filter design: please follow guidelines issued by intel and amd . (2) please follow the guidelines issued by intel and amd .
3 ? 2005 semtech corp. www.semtech.com power management SC1214 electrical characteristics absolute maximum ratings unless specified: t a = 25c; v in = 12v; v reg = 8.5v 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 y l p p u s r e w o p e g a t l o v y l p p u sv n i 92 15 1v g n i t a r e p o , t n e r r u c t n e c s e i u qp o _ q i0 . 3a m t u o k c o l e g a t l o v r e d n u f o d l o h s e r h t t r a t sv g e r e g a t l o vv t r a t s _ g e r 43 . 4v s i s e r e t s y hs y h v o l v u 0 6 1v m o d l l a n r e t n i t u p t u o o d lv g e r v n i v 5 1 o t v 9 =5 . 8v e g a t l o v t u o p o r dv p o r d v n i v 8 . 8 o t v 5 =3 . 0v 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. r e t e m a r a pl o b m y ss n o i t i d n o cm u m i x a ms t i n u v n i e g a t l o v y l p p u sv n i 6 1v n r d o t g t , t s bv , n r d - t s b v n r d - g t 1 1v d n g p o t t s bv d n g p - t s b 0 4v e s l u p d n g p o t t s bv e s l u p - t s b t e s l u p s n 0 0 1 <5 4v d n g p o t n r dv d n g p - n r d 0 3 o t 2 -v e s l u p d n g p o t n r dv e s l u p - n r d t e s l u p s n 0 0 2 <5 3 o t 5 -v d n g p o t g bv d n g p - g b 1 1v d n g p o t g e r vv d n g p - g e r 1 1v d n g p o t n p vv n p 6 1v e s l u p d n g p o t n p vv e s l u p - n p t e s l u p s n 0 0 1 <0 2v t u p n i m w po c5 . 8 o t 3 . 0 -v n o i t a p i s s i d r e w o p s u o u n i t n o cp d t a t , c 5 2 = j c 5 2 1 =6 7 . 1w 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 7 1w / 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 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 note: (1) this device is esd sensitive. use of standard esd handling precautions is required.
4 ? 2005 semtech corp. www.semtech.com power management SC1214 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 2 o c , 1 o c e g a t l o v t u p n i h g i h c i g o lv h _ o c 0 . 2v e g a t l o v t u p n i w o l c i g o lv l _ o c 8 . 0v n w o d t u h s l a m r e h t t n i o p p i r t e r u t a r e p m e t r e v ot p t o 5 5 1c s i s e r e t s y ht t s y h 0 1c ) 2 g t , 1 g t ( r e v i r d e d i s h g i h e c n a d e p m i t u p t u o r g t _ c r s v t s b v - n r d v 5 . 8 = 5 . 10 . 3 m h o r g t _ k n i s 0 . 10 . 2 e m i t e s i rt g t _ r v , f n 3 . 3 = l c t s b v - n r d v 5 . 8 =5 1s n e m i t l l a ft g t _ f v , f n 3 . 3 = l c t s b v - n r d v 5 . 8 =0 1s n h g i h g n i o g g t , y a l e d n o i t a g a p o r pt g t _ h d p v t s b v - n r d v 5 . 8 =7 3s n w o l g n i o g g t , y a l e d n o i t a g a p o r pt g t _ l d p v t s b v - n r d v 5 . 8 =0 3s n ) 2 g b , 1 g b ( r e v i r d e d i s - w o l e c n a d e p m i t u p t u o r g b _ c r s v g e r v 5 . 8 = 5 . 10 . 3 m h o r g b _ k n i s 5 . 10 . 3 e m i t e s i rt g b _ r v , f n 3 . 3 = l c g e r v 5 . 8 =0 1s n e m i t l l a ft g b _ f v , f n 3 . 3 = l c g e r v 5 . 8 =0 1s n h g i h g n i o g g b , y a l e d n o i t a g a p o r pt g b _ h d p v g e r v 5 . 8 =0 2s n w o l g n i o g g b , y a l e d n o i t a g a p o r pt g b _ l d p v g e r v 5 . 8 =7 2s n e m i t - f f o m u m i n i m 2 g b , 1 g b ) 1 ( t g b _ f f o 5 7s n y a l e d e m i t t u o k c o l - e g a t l o v - r e d n u v g e r p u g n i p m a rt o l v u _ h d p 2s v g e r n w o d g n i p m a rt o l v u _ l d p 2s electrical characteristics (cont.) unless specified: t a = 25c; v in = 12v; v reg = 8.5v note: (1) guaranteed by design.
5 ? 2005 semtech corp. www.semtech.com power management SC1214 timing diagrams co t pdl_bg t f_bg t pdh_tg t r_tg bg tg t pdl_tg t f_tg t pdh_bg t r_bg ris in g ed ge tr ans it ion falling edge transition dr n 1.4v 1.0v
6 ? 2005 semtech corp. www.semtech.com power management SC1214 pin configurations pin descriptions e c i v e de g a k c a pt ( e g n a r . p m e t j ) r t s t 4 1 2 1 c s ) 1 ( 0 2 - p o s s tc 5 2 1 - 0 t r t s t 4 1 2 1 c s ) 2 ( ) 1 ( 0 2 - p o s s tc 5 2 1 - 0 # n i pe m a n n i pn o i t c n u f n i p 2 1 , 22 g t , 1 g t . t e f s o m ) p o t ( g n i h c t i w s e h t r o f e v i r d e t a g t u p t u o 1 1 , 12 n r d , 1 n r d e b n a c n i p s i h t . r e t r e v n o c k c u b s u o n o r h c n y s e h t f o ) e d o n g n i h c t i w s r o ( e d o n e s a h p r e w o p e h t . n o i t a r e p o g n i t c e f f a t u o h t i w d n g p o t e v i t a l e r g e r v - o t p u e k i p s e v i t a g e n a o t d e t c e j b u s 3 1 , 32 t s b , 1 t s b g n i t a o l f e h t p o l e v e d o t s n i p n r d d n a t s b n e e w t e b d e t c e n n o c s i r o t i c a p a c a . n i p p a r t s t o o b . ) c i m a r e c ( f 1 y l l a c i p y t s i e u l a v r o t i c a p a c e h t . t e f s o m e d i s - h g i h e h t r o f e g a t l o v p a r t s t o o b 8 , 8 12 g e r v , 1 g e r v . ) m m 5 ( " 2 . 0 n a h t e r o m o n h t g n e l d a e l h t i w ) c i m a r e c ( f 7 . 4 o t f 1 h t i w e l p u o c e d . t u p t u o o d l 4 1 , 42 o c , 1 o c l a n r e t n i n a . r e l l o r t n o c l a n r e t x e y b d e i l p p u s 4 1 2 1 c s e h t o t l a n g i s t u p n i m w p l e v e l c i g o l . d n g p o t n i p s i h t m o r f d e t c e n n o c s i r o t s i s e r m h o k 0 5 6 , 6 12 n p v , 1 n p v e l b a n e o t t n i o p e s n e s t u p t u o e h t d n a n i p s i h t n e e w t e b c r n a t c e n n o c . e d o n e s a h p l a u t r i v e s n e s - i b m o c m t . t i u c r i c n o i t a c i l p p a l a c i p y t e h t e e s . n o i t a r e p o 0 2 , 0 1d n g p . e c r u o s s t e f s o m s u o n o r h c n y s e h t o t e s o l c s n i p e s e h t p e e k . d n u o r g 9 , 9 12 g b , 1 g b. t e f s o m ) m o t t o b ( s u o n o r h c n y s e h t r o f e v i r d e t a g t u p t u o 7 , 7 12 n i v , 1 n i v l a n r e t n i e h t d n a o d l , e v i r d e t a g w o l r o f r e w o p y l p p u se s n e s - i b m o c m t o t t c e n n o c . y r t i u c r i c . r e t r e v n o c e h t f o l i a r r e w o p t u p n i note: (1) only available in tape and reel packaging. a reel contains 2500 devices. (2) lead free product. this product is fully weee and rohs compliant. ordering information (20-pin tssop) top view vin2 vreg2 pgnd bg1 vreg1 vin1 vpn1 nc co2 bst2 tg2 drn2 drn1 tg1 bst1 co1 nc vpn2 bg2 pgnd 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11
7 ? 2005 semtech corp. www.semtech.com power management SC1214 block diagram pgnd vreg1,2 vpn1,2 tg1,2 ldo bst 1,2 bg1,2 drn1,2 co1,2 cont rol & ov erlap prot ection circ uit uv l o v in1,2 logic
8 ? 2005 semtech corp. www.semtech.com power management SC1214 contact information semtech corporation power management products division 200 flynn road, camarillo, ca 93012 phone: (805)498-2111 fax (805)498-3804 outline drawing - tssop-20 land pattern - tssop-20 l (l1) c 01 gage plane see detail detail a a 0.25 .026 bsc .252 bsc 20 .004 .169 .251 .173 .255 .007 - 20 0.10 0.65 bsc 6.40 bsc 4.40 6.50 - .177 .259 4.30 6.40 .012 0.19 4.50 6.60 0.30 bxn 2x n/2 tips seating aaa c e/2 indicator pin 1 2x 1 3 2 n e1 bbb c a-b d ccc c dimensions "e1" and "d" do not include mold flash, protrusions 3. or gate burrs. datums and to be determined at datum plane controlling dimensions are in millimeters (angles in degrees). -b- notes: 1. 2. -a- -h- side view (.039) .004 .008 - .024 - - - - 0 .018 .003 .031 .002 - 8 0 0.20 0.10 - 8 0.45 0.09 0.80 0.05 .030 .007 .047 .042 .006 - (1.0) 0.60 - 0.75 0.20 - - - 1.20 1.05 0.15 a b c d e e/2 h plane d e a1 a2 a reference jedec std mo-153, variation ac. 4. inches b n ccc aaa bbb 01 e1 e l l1 e d c a2 a1 dim a min max millimeters min dimensions nom max nom (.222) (5.65) z g y p (c) 4.10 .161 0.65 .026 0.40 .016 1.55 .061 7.20 .283 x inches dimensions z p y x dim c g millimeters this land pattern is for reference purposes only. consult your manufacturing group to ensure your company's manufacturing guidelines are met. notes: 1.
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