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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. 08.02 power products non-isolated dc/dc converters bp02s7db-08c 3.3v input / 1.2v ? 2.5v output / 8a 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-08c 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. 8a maximum output is also provided. standard features include remote on/off, 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-08c 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 8w 0 2% 2 90 5 2 c 8 0 - b d 7 s v 8 . 1v 3 . 3a 8w 4 . 4 1% 8 80 8 1 c 8 0 - b d 7 s v 5 . 1v 3 . 3a 8w 2 1% 6 80 5 1 c 8 0 - b d 7 s v 2 . 1v 3 . 3a 8w 6 . 9% 3 80 2 1 c 8 0 - 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. 08.02 power products non-isolated dc/dc converters bp02s7db-08c 3.3v input / 1.2v ? 2.5v output / 8a 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 9 . 7 3 . 6 3 . 5 4 . 4 a t n e r r u c t u p n i d a o l o nl l a 0 0 1a m t n e r r u c t u p n i f f o e t o m e r 0 10 2a 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 0 20 4a 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 0 60 0 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 t 5 0 . 01 . 0a 2 s d l o h s e r h t e g a t l o v n o n r u t 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 t 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. 08.02 power products non-isolated dc/dc converters bp02s7db-08c 3.3v input / 1.2v ? 2.5v output / 8a 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 5 4 . 2 4 6 7 . 1 7 4 . 1 6 7 1 . 1 5 . 2 8 . 1 5 . 1 2 . 1 5 5 . 2 6 3 8 . 1 3 5 . 1 4 2 2 . 1 v n o i t a l u g e r d a o l v 5 . 2 v 8 . 1 v 5 . 1 v 2 . 1 0 . 7 0 . 7 0 . 6 0 . 6 5 1 5 1 5 1 5 1 v 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 0 1 8 5 4 5 2 0 2 5 1 2 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 5 4 0 4 5 3 2 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 4 0 4 0 4 0 0 1 5 7 5 7 5 7 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 l l a 0 15 2s 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 8a 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 i4 . 0 1 0 2a 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 6 0 . 0 7 0 . 0 9 0 . 0 5 1 . 0 2 1 . 0 4 1 . 0 8 1 . 0 2 2 . 0 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 2 3f
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. 08.02 power products non-isolated dc/dc converters bp02s7db-08c 3.3v input / 1.2v ? 2.5v output / 8a 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/1s, ta = 25 c with a 470f 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 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 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 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 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. 08.02 power products non-isolated dc/dc converters bp02s7db-08c 3.3v input / 1.2v ? 2.5v output / 8a 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 12-14. 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 9 8 5 8 3 8 0 8 2 9 8 8 6 8 3 8 % y c n e u q e r f g n i h c t i w sl l aw s f0 5 20 0 30 4 3z 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 8 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 v 5 . 2 v 8 . 1 v 5 . 1 v 2 . 1 5 0 1 0 1 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. 08.02 power products non-isolated dc/dc converters bp02s7db-08c 3.3v input / 1.2v ? 2.5v output / 8a page 6 efficiency data module 2.5v 87% 88% 89% 90% 91% 92% 93% 94% 95% 96% 1.02.03.04.05.06.07.08.0 output current efficiency 3.0v 3.3v 3.6v module 1.8v 83% 84% 85% 86% 87% 88% 89% 90% 91% 92% 93% 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 output current efficiency 3.0v 3.3v 3.6v module 1.5v 80% 81% 82% 83% 84% 85% 86% 87% 88% 89% 90% 91% 92% 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 output current efficiency 3.0v 3.3v 3.6v module 1.2v 79% 80% 81% 82% 83% 84% 85% 86% 87% 88% 89% 90% 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 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. 08.02 power products non-isolated dc/dc converters bp02s7db-08c 3.3v input / 1.2v ? 2.5v output / 8a 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 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 1f ceramic cap and 10f aluminum electrolytic cap are added at the output.
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. 08.02 power products non-isolated dc/dc converters bp02s7db-08c 3.3v input / 1.2v ? 2.5v output / 8a page 8 transient response transient response: di/dt = 0.5a/s, external load capacitance co=470f (tantalum capacitor) 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
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. 08.02 power products non-isolated dc/dc converters bp02s7db-08c 3.3v input / 1.2v ? 2.5v output / 8a 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 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 transient response: di/dt = 0.5a/s, external load capacitance co=470f (tantalum capacitor)
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. 08.02 power products non-isolated dc/dc converters bp02s7db-08c 3.3v input / 1.2v ? 2.5v output / 8a page 10 thermal considerations output voltage set-point adjustment vo tr i m gnd vo tr i m gnd trim down test circuit trim up test circuit derating curve output current (a) output current vs. local ambient temperature and air velocity ambient temperature, ta (?c) 0 60 30 70 85 6 8 4 2 0 natural convection 100lfm 200lfm 300lfm 10 20 40 50
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. 08.02 power products non-isolated dc/dc converters bp02s7db-08c 3.3v input / 1.2v ? 2.5v output / 8a page 11 S7DB-08C250 trim resistor calculation rtrim down = 9.590 vo ? vo, adj ? 14.29 ) kohm ( rtrim up = 4.504 vo, adj ? vo ? 8.66 ) kohm ( output voltage set-point adjustment s7db-08c180 trim resistor calculation rtrim down = 3.869 vo ? vo, adj ? 12.5 ) kohm ( rtrim up = 3.072 vo, adj ? vo ? 8.66 ) kohm ( 1.9 1.96 2.02 2.08 2.14 2.2 2.26 2.32 2.38 2.44 2.5 0 30 60 90 120 150 180 210 240 270 300 a djusted outp ut voltage vo,adj (v) trim resistor value rtrim_down(kohm) 2.5 2.52 2.53 2.54 2.56 2.58 2.59 2.61 2.62 2.63 2.65 0 30 60 90 120 150 180 210 240 270 300 adjusted output voltage vo,adj(v) trim resistor value,rtrim_up(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 a djust ed outp ut 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)
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. 08.02 power products non-isolated dc/dc converters bp02s7db-08c 3.3v input / 1.2v ? 2.5v output / 8a page 12 s7db-08c150 trim resistor calculation rtrim down = 2.712 vo ? vo, adj ? 12.5 ) kohm ( rtrim up = 3.072 vo, adj ? vo ? 8.66 ) kohm ( s7db-08c120 trim resistor calculation rtrim down = 1.562 vo ? vo, adj ? 8.48 ) kohm ( rtrim up = 3.072 vo, adj ? vo ? 4.64 ) kohm ( output voltage set-point adjustment 1.25 1.27 1.3 1.33 1.35 1.38 1.4 1.43 1.45 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 1.54 1.58 1.62 1.66 1.7 1.74 1.78 1.82 1.86 1.9 0 30 60 90 120 150 180 210 240 270 300 ad jus t ed ou t p u t vo ltage vo ,ad j(v) trim resistor value,rtrim_up (kohm) 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 1.22 1.24 1. 26 1.28 1.3 1.32 1. 34 1.36 1.38 1.4 0 30 60 90 120 150 180 210 240 270 300 adjusted output voltage vo,adj(v) t rim 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. 08.02 power products non-isolated dc/dc converters bp02s7db-08c 3.3v input / 1.2v ? 2.5v output / 8a page 13 mechanical 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 + 0.827 [21.00] 0.102 [2.60] 0.118 [3.00] 0.197 [5.00] 0.345 [8.75] 1.22 [31.00] 0.079 [2.00] 0.669 [17.00] 1 2 3 456 12 11 10 9 8 7 dimensions are in inches [millimeters]. standard dimension tolerance is 0.005 [0.13] unless otherwise noted.

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