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bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 fax 201-432-9542 www.belfuse.com ?2002 bel fuse inc. specifications subject to change without notice. 10.02 power products non-isolated dc/dc converters bp02s7db-12c 3.3v input / 1.2v ? 2.5v output / 12a nonisolated compact, low profile surface mount package fixed frequency high efficiency means less power dissipation excellent thermal performance optimized for cost remote on/off undervoltage lockout (uvlo) over current and short circuit protection remote sense description the bel s7db-12c modules are a series of non-isolated, step down dc/dc power converters that operate from a nominal 3.3v source. these converters are available in a range of output voltages from 1.2v to 2.5v. they are packaged in a compact, low profile, surface mount dip package for ease of layout and space savings. 12a maximum output is also provided. standard features include remote on/off, remote sense, over current and short circuit protection, uvlo and output voltage adjust. these products may be used almost anywhere low voltage silicon is employed and a 3.3v source is available. typical applications include file servers, routers, line cards and other computing and communications equipment. applications page 1 s7db-12c series distributed power architectures data networking equipment telecommunications computers and peripherals part number selection t u p t u o e g a t l o v t u p n i e g a t l o v t u p t u o . x a m t n e r r u c t u p t u o . x a m r e w o p l a c i p y t y c n e i c i f f e r e b m u n t r a p v 5 . 2v 3 . 3a 2 1w 0 3% 1 90 5 2 c 2 1 - b d 7 s v 8 . 1v 3 . 3a 2 1w 6 . 1 2% 7 80 8 1 c 2 1 - b d 7 s v 5 . 1v 3 . 3a 2 1w 0 . 8 1% 4 80 5 1 c 2 1 - b d 7 s v 2 . 1v 3 . 3a 2 1w 4 . 4 1% 2 80 2 1 c 2 1 - b d 7 s
bel fuse inc. 206 van vorst street, jersey city, nj 07302 tel 201-432-0463 fax 201-432-9542 www.belfuse.com ?2002 bel fuse inc. specifications subject to change without notice. 10.02 power products non-isolated dc/dc converters bp02s7db-12c 3.3v input / 1.2v ? 2.5v output / 12a page 2 input specifications absolute maximum ratings note: use beyond the maximum ratings may cause a reliability degradation of the dc/dc converter or may permanently damage the device. note: input capacitance two 270f/10v, esr = 0.018 ? max at 100khz @ 25 c. 1. with simulated source impedance of 500nh, 5hz to 20mhz. r e t e m a r a p l o b m y s n i m l a c i p y t x a m t i n u e g a t l o v t u p n i s u o u n i t n o cn i v3 . 0 - 4v e g a t l o v l a n i m r e t e l b a n e t u p t u on e t u o v3 . 0 - 4v e r u t a r e p m e t t n e i b m ab m a t0 4 - 5 8c e r u t a r e p m e t e g a r o t sr o t s t5 5 - 0 0 1c r e t e m a r a p e l u d o m l o b m y s n i m l a c i p y t x a m s t i n u e g a t l o v t u p n i g n i t a r e p ol l an i v33 . 36 . 3v t n e r r u c t u p n i v 5 . 2 v 8 . 1 v 5 . 1 v 2 . 1 n i i 2 1 5 . 9 2 . 8 7 . 6 a t n e r r u c t u p n i d a o l o n l l a 0 0 1 a m t n e r r u c t u p n i f f o e t o m e r 0 10 2 a m t n e r r u c e l p p i r d e t c e l f e r t u p n i 1 l l a 5 20 5 a m s m r ) p - p ( t n e r r u c e l p p i r d e t c e l f e r t u p n i 1 l l a 0 80 6 1k p a m i 2 t n e i s n a r t t n e r r u c h s u r n i tl l a 1 . 02 . 0a 2 s d l o h s e r h t e g a t l o v n o n r u tl l a 5 8 . 2 v d l o h s e r h t e g a t l o v f f o n r u tl l a 3 . 2 v
bel fuse inc. 206 van vorst street, jersey city, nj 07302 tel 201-432-0463 fax 201-432-9542 www.belfuse.com ?2002 bel fuse inc. specifications subject to change without notice. 10.02 power products non-isolated dc/dc converters bp02s7db-12c 3.3v input / 1.2v ? 2.5v output / 12a page 3 output specifications note: all specifications are typical at nominal input, full load at 25 c unless otherwise stated. 1. vin = 3.3v, iout = full load, ta = 25 c. 2. 0 - 20mhz, 1f ceramic cap and 10f aluminum cap on output. r e t e m a r a p e l u d o m l o b m y s n i m l a c i p y t x a m s t i n u t n i o p t e s e g a t l o v t u p t u o 1 v 5 . 2 v 8 . 1 v 5 . 1 v 2 . 1 t u o v 0 5 4 . 2 4 6 7 . 1 0 7 4 . 1 6 7 1 . 1 0 0 5 . 2 0 0 8 . 1 0 0 5 . 1 0 0 2 . 1 0 5 5 . 2 6 3 8 . 1 0 3 5 . 1 4 2 2 . 1 v n o i t a l u g e r d a o ll l a 0 . 30 1v m n o i t a l u g e r e n i ll l a 0 . 25v m e r u t a r e p m e t r e v o n o i t a l u g e r v 5 . 2 v 8 . 1 v 5 . 1 v 2 . 1 9 1 3 1 1 1 9 8 3 7 2 3 2 8 1 v m n o i t a l u g e r e g a t l o v t u p t u o l a t o t v 5 . 2 v 8 . 1 v 5 . 1 v 2 . 1 3 5 2 4 8 3 3 3 v m e s i o n d n a e l p p i r t u p t u o 2 v 5 . 2 v 8 . 1 v 5 . 1 v 2 . 1 5 5 0 5 0 4 0 4 0 0 1 0 0 1 0 0 1 0 0 1 p - p v m e s i o n d n a e l p p i r t u p t u o 2 v 5 . 2 v 8 . 1 v 5 . 1 v 2 . 1 5 1 0 1 0 1 0 1 0 3 5 2 5 2 5 2 s m r v m e g n a r t n e r r u c t u p t u ol l at u o i0 2 1a t i m i l t n e r r u c c d t u p t u ol l am i l t u o i6 . 5 1 0 3a e g r u s t i u c r i c t r o h s v 5 . 2 v 8 . 1 v 5 . 1 v 2 . 1 e g r u s t u o i 1 . 0 2 . 0 5 . 0 6 . 0 2 . 0 4 . 0 1 2 . 1 a 2 s e m i t n o n r u tl l an o t 0 10 2s m n o n r u t t a t o o h s r e v ol l a 03% e c n a t i c a p a c t u p t u ol l at u o c0 0 0 8 4f
bel fuse inc. 206 van vorst street, jersey city, nj 07302 tel 201-432-0463 fax 201-432-9542 www.belfuse.com ?2002 bel fuse inc. specifications subject to change without notice. 10.02 power products non-isolated dc/dc converters bp02s7db-12c 3.3v input / 1.2v ? 2.5v output / 12a page 4 output specifications note: all specifications are typical at nominal input, full load at 25 c unless otherwise stated. 3. di/dt = 0.5a/s, vin=3.3vdc, ta = 25 c, and with a 470f (esr=0.90 ohm) tantalum cap at output. r e t e m a r a p e l u d o m l o b m y s n i m l a c i p y t x a m s t i n u e s n o p s e r t n e i s n a r t 3 ? d a o l x a m f o % 0 0 1 o t % 0 5 v v 5 . 2 0 1 10 5 1v m e m i t g n i l t t e ss t 0 50 0 1s ? d a o l x a m f o % 0 5 o t % 0 0 1 v 0 1 10 5 1v m e m i t g n i l t t e ss t 0 50 0 1s e s n o p s e r t n e i s n a r t 3 ? d a o l x a m f o % 0 0 1 o t % 0 5 v v 8 . 1 0 0 10 5 1v m e m i t g n i l t t e ss t 0 50 0 1s ? d a o l x a m f o % 0 5 o t % 0 0 1 v 0 0 10 5 1v m e m i t g n i l t t e ss t 0 50 0 1s e s n o p s e r t n e i s n a r t 3 ? d a o l x a m f o % 0 0 1 o t % 0 5 v v 5 . 1 0 0 10 5 1v m e m i t g n i l t t e ss t 0 50 0 1s ? d a o l x a m f o % 0 5 o t % 0 0 1 v 0 0 10 5 1v m e m i t g n i l t t e ss t 0 50 0 1s e s n o p s e r t n e i s n a r t 3 ? d a o l x a m f o % 0 0 1 o t % 0 5 v v 2 . 1 0 95 2 1v m e m i t g n i l t t e ss t 0 50 0 1s ? d a o l x a m f o % 0 5 o t % 0 0 1 v 0 95 2 1v m e m i t g n i l t t e ss t 0 50 0 1s
bel fuse inc. 206 van vorst street, jersey city, nj 07302 tel 201-432-0463 fax 201-432-9542 www.belfuse.com ?2002 bel fuse inc. specifications subject to change without notice. 10.02 power products non-isolated dc/dc converters bp02s7db-12c 3.3v input / 1.2v ? 2.5v output / 12a page 5 note: on/off pin designed to work with an open collector/drain switch. control specifications general specifications 1. vin=3.3v, full load and ta=25 c. 2. see graphs on pages 10-12. total adjustment of trim, setpoint and remote sense combined should not exceed 5% at nominal vin, 25c ambient for the 2.5v output module. 3. with remote on/off pin 8 open, the module is on. r e t e m a r a p e l u d o m l o b m y s n i m l a c i p y t x a m s t i n u y c n e i c i f f e 1 v 5 . 2 v 8 . 1 v 5 . 1 v 2 . 1 8 8 4 8 1 8 9 7 1 9 7 8 4 8 2 8 % y c n e u q e r f g n i h c t i w s l l a w s f 0 5 20 0 30 4 3 z h k e g n a r m i r t e g a t l o v t u p t u o 2 v 5 . 2 v 8 . 1 v 5 . 1 v 2 . 1 0 9 0 9 0 9 0 9 5 0 1 0 1 1 0 1 1 0 1 1 % n o i t a s n e p m o c e s n e s e t o m e r l l a 0 1 % t h g i e wl l a 5 . 0 1 g r e t e m a r a p e l u d o m l o b m y s n i m l a c i p y t x a m s t i n u f f o / n o e t o m e r 3 l l an e t u o v v ) f f o t i n u ( w o l l a n g i sl l a3 . 0 - 8 . 0v ) n o t i n u ( h g i h l a n g i sl l a8 . 2 4v
bel fuse inc. 206 van vorst street, jersey city, nj 07302 tel 201-432-0463 fax 201-432-9542 www.belfuse.com ?2002 bel fuse inc. specifications subject to change without notice. 10.02 power products non-isolated dc/dc converters bp02s7db-12c 3.3v input / 1.2v ? 2.5v output / 12a page 6 efficiency data module 2.5v 89% 90% 91% 92% 93% 94% 95% 96% 97% 12345678910111213 output current efficiency 3.0v 3.3v 3.6v module 1.8v 84% 86% 88% 90% 92% 94% 96% 12345678910111213 output current efficiency 3.0v 3.3v 3.6v module 1.5v 82% 84% 86% 88% 90% 92% 94% 12345678910111213 output current efficiency 3.0v 3.3v 3.6v module 1.2v 80% 82% 84% 86% 88% 90% 92% 12345678910111213 output current efficiency 3.0v 3.3v 3.6v
bel fuse inc. 206 van vorst street, jersey city, nj 07302 tel 201-432-0463 fax 201-432-9542 www.belfuse.com ?2002 bel fuse inc. specifications subject to change without notice. 10.02 power products non-isolated dc/dc converters bp02s7db-12c 3.3v input / 1.2v ? 2.5v output / 12a page 7 ripple and noise ripple and noise at full load and 3.3vdc input, 2.5vdc output and ta=25 c ripple and noise at full load and 3.3vdc input, 1.8vdc output and ta=25 c 1f ceramic cap and 10f aluminum electrolytic cap added at the output. ripple and noise at full load and 3.3vdc input, 1.5vdc output and ta=25 c ripple and noise at full load and 3.3vdc input, 1.2vdc output and ta=25 c
bel fuse inc. 206 van vorst street, jersey city, nj 07302 tel 201-432-0463 fax 201-432-9542 www.belfuse.com ?2002 bel fuse inc. specifications subject to change without notice. 10.02 power products non-isolated dc/dc converters bp02s7db-12c 3.3v input / 1.2v ? 2.5v output / 12a page 8 transient response transient response: di/dt = 0.5a/s,external load capacitance co=470f (tantalum capacitor esr=0.9 ohm) vout=2.5v 50% to 100% load transients at 3.3v input and ta=25 c vout=2.5v 100% to 50% load transients at 3.3v input and ta=25 c vout=1.8v 50% to 100% load transients at 3.3v input and ta=25 c vout=1.8v 100% to 50% load transients at 3.3v input and ta=25 c vout=1.5v 50% to 100% load transients at 3.3v input and ta=25 c vout=1.5v 100% to 50% load transients at 3.3v input and ta=25 c
bel fuse inc. 206 van vorst street, jersey city, nj 07302 tel 201-432-0463 fax 201-432-9542 www.belfuse.com ?2002 bel fuse inc. specifications subject to change without notice. 10.02 power products non-isolated dc/dc converters bp02s7db-12c 3.3v input / 1.2v ? 2.5v output / 12a page 9 transient response vout=1.2v 50% to 100% load transients at 3.3v input and ta=25 c vout=1.2v 100% to 50% load transients at 3.3v input and ta=25 c thermal considerations derating curve output current (a) output current vs. local ambient temperature and air velocity ambient temperature, ta (?c) 0 60 30 70 6 10 4 2 0 natural convection 100lfm 10 20 40 50 12 8 200lfm 300lfm 85 transient response: di/dt = 0.5a/s,external load capacitance co=470f (tantalum capacitor esr=0.9 ohm)
bel fuse inc. 206 van vorst street, jersey city, nj 07302 tel 201-432-0463 fax 201-432-9542 www.belfuse.com ?2002 bel fuse inc. specifications subject to change without notice. 10.02 power products non-isolated dc/dc converters bp02s7db-12c 3.3v input / 1.2v ? 2.5v output / 12a page 10 output voltage set-point adjustment vo tr i m gnd vo tr i m gnd trim down test circuit trim up test circuit output voltage set-point adjustment s7db-12c250 trim resistor calculation rtrim down = 7.544 vo ? vo, adj ? 13.52 ) kohm ( rtrim up = 3.544 vo, adj ? vo ? 9.09 ) kohm ( rtrimup function = 2 2.052.12.152.22.252.32.352.42.452.5 0 30 60 90 120 150 180 210 240 270 300 adjusted outp ut voltage vo,adj (v) trim resistor value rtrim_down(kohm) 2.5 2.53 2.56 2.59 2.62 2.65 2.68 2.71 2.74 2.77 2.8 0 30 60 90 120 150 180 210 240 270 300 adjusted outp ut voltage vo,adj(v) trim resistor value,rtrim_up(kohm)
bel fuse inc. 206 van vorst street, jersey city, nj 07302 tel 201-432-0463 fax 201-432-9542 www.belfuse.com ?2002 bel fuse inc. specifications subject to change without notice. 10.02 power products non-isolated dc/dc converters bp02s7db-12c 3.3v input / 1.2v ? 2.5v output / 12a page 11 S7DB-12C180 trim resistor calculation rtrim down = 3.857 vo ? vo, adj ? 12.93 ) kohm ( rtrim up = 3.072 vo, adj ? vo ? 9.09 ) kohm ( output voltage set-point adjustment s7db-12c150 trim resistor calculation rtrim down = 2.708 vo ? vo, adj ? 10.99 ) kohm ( rtrim up = 3.072 vo, adj ? vo ? 7.15 ) kohm ( 1.5 1.53 1.56 1.59 1.62 1.65 1.68 1.71 1.74 1.77 1.8 0 30 60 90 120 150 180 210 240 270 300 adjusted output voltage vo,adj (v) trim resistor value rtrim_down(kohm) 1.8 1.83 1.86 1.89 1.92 1.95 1.98 2.01 2.04 2.07 2.1 0 30 60 90 120 150 180 210 240 270 300 adjusted output voltage vo,adj(v) trim resistor value,rtrim_up(kohm) 1.3 1.32 1.34 1.36 1.38 1.4 1.42 1.44 1.46 1.48 1.5 0 30 60 90 120 150 180 210 240 270 300 adjusted output voltage vo,adj (v) trim resistor value rtrim_down(kohm) 1.5 1.53 1.56 1.59 1.62 1.65 1.68 1.71 1.74 1.77 1.8 0 30 60 90 120 150 180 210 240 270 300 adjusted output voltage vo,adj(v) trim resistor value,rtrim_up(kohm)
bel fuse inc. 206 van vorst street, jersey city, nj 07302 tel 201-432-0463 fax 201-432-9542 www.belfuse.com ?2002 bel fuse inc. specifications subject to change without notice. 10.02 power products non-isolated dc/dc converters bp02s7db-12c 3.3v input / 1.2v ? 2.5v output / 12a page 12 s7db-12c120 trim resistor calculation rtrim down = 1.553 vo ? vo, adj ? 8.26 ) kohm ( rtrim up = 3.072 vo, adj ? vo ? 4.42 ) kohm ( output voltage set-point adjustment 1 1.02 1.04 1.06 1.08 1.1 1.12 1.14 1.16 1.18 1.2 0 30 60 90 120 150 180 210 240 270 300 adjusted output voltage vo,adj (v) trim resistor value rtrim_down(kohm) 1.2 1.23 1.26 1.29 1.32 1.35 1.38 1.41 1.44 1.47 1.5 0 30 60 90 120 150 180 210 240 270 300 adjusted output voltage vo,adj(v) trim resistor value,rtrim_up (kohm)
corporate bel fuse inc. 206 van vorst street jersey city, nj 07302 tel 201-432-0463 fax 201-432-9542 www.belfuse.com far east bel fuse ltd. 8f / 8 luk hop street san po kong kowloon, hong kong tel 852-2328-5515 fax 852-2352-3706 www.belfuse.com europe bel fuse europe ltd. preston technology management centre marsh lane, suite g7, preston lancashire, pr1 8ud, u.k. tel 44-1772-556601 fax 44-1772-888366 www.belfuse.com ?2002 bel fuse inc. specifications subject to change without notice. 10.02 power products non-isolated dc/dc converters bp02s7db-12c 3.3v input / 1.2v ? 2.5v output / 12a page 13 mechanical dimensions are in inches [millimeters]. standard dimension tolerance is 0.005 [0.13] unless otherwise noted. 1.22 [30.99] 0.394 [10.01] 0.67 [17.00] 0.985 [25.02] 5x 0.197 [5.00] 6x 0.102 [2.59] 0.345 [8.76] 0.010 [0.25] 0.827 [21.01] 2x 0.050 [1.27] 2x 0.079 [1.99] 0.004 [0.10] 0?- 5? 0.100 [2.54] 0.120 [3.05] 0.197 [5.00] 0.895 [22.73] suggested pcb pad layout 12 34 5 6 12 11 10 98 7 n i p n o i t c n u f 1d n u o r g 2d n u o r g 3d n u o r g 4d n u o r g 5n i v + 6n i v + 7m i r t 8f f o / n o e t o m e r 9) + ( e s n e s e t o m e r 0 1o v + 1 1o v + 2 1o v +

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