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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 ?2004 bel fuse inc. specifications subject to change without notice. 03.04 power products non-isolated dc/dc converters bp03x7ah-08b 5v input / 0.9v ? 3.3v 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 description the bel s7ah-08b and V7AH-08B modules are a series of non-isolated, step down dc/dc power converters that operate from a nominal 5v source. these converters are available in a range of output voltages from 0.9v to 3.3v. they are packaged in a compact, overmolded package rated at 8a. optional lead forming provides a vertical mount product for minimal footprint or a surface mount option for a very low profile. standard features include remote on/off, over current and short circuit protection, output voltage adjust and industrial temperature range (-40 to +85 c). the output is closely regulated and the efficiency is typically 92% at full load. these products may be used almost anywhere low voltage silicon is employed and a 5v source is available. typical applications include file servers, routers, line cards and other computing and communications equipment. applications page 1 s7ah-08b / V7AH-08B 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 t n u o m e c a f r u s r e b m u n t r a p t n u o m l a c i t r e v v 3 . 3v 5a 8w 4 . 6 2% 2 90 3 3 b 8 0 - h a 7 s0 3 3 b 8 0 - h a 7 v v 5 . 2v 5a 8w 0 2% 0 90 5 2 b 8 0 - h a 7 s0 5 2 b 8 0 - h a 7 v v 8 . 1v 5a 8w 4 . 4 1% 6 80 8 1 b 8 0 - h a 7 s0 8 1 b 8 0 - h a 7 v v 5 . 1v 5a 8w 2 1% 4 80 5 1 b 8 0 - h a 7 s0 5 1 b 8 0 - h a 7 v v 2 . 1v 5a 8w 6 . 9% 2 80 2 1 b 8 0 - h a 7 s0 2 1 b 8 0 - h a 7 v v 0 . 1v 5a 8w 8% 0 80 0 1 b 8 0 - h a 7 s0 0 1 b 8 0 - h a 7 v v 9 . 0v 5a 8w 2 . 7% 9 70 9 0 b 8 0 - h a 7 s0 9 0 b 8 0 - h a 7 v v 3 . 3 - v 9 . 0v 5a 8w 4 . 6 2% 2 90 a 1 b 8 0 - h a 7 s0 a 1 b 8 0 - h a 7 v 4 .com u datasheet
bel fuse inc. 206 van vorst street, jersey city, nj 07302 tel 201-432-0463 fax 201-432-9542 www.belfuse.com ?2004 bel fuse inc. specifications subject to change without notice. 03.04 power products non-isolated dc/dc converters bp03x7ah-08b 5v input / 0.9v ? 3.3v 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 one 270f/16v, 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 - 6v 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 - 6v 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 - 5 2 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 v5 . 4 5 . 5v t n e r r u c t u p n i v 3 . 3 v 5 . 2 v 8 . 1 v 5 . 1 v 2 . 1 v 0 . 1 v 9 . 0 n i i 3 . 7 6 . 5 3 . 4 6 . 3 0 . 3 5 . 2 3 . 2 a t n e r r u c t u p n i d a o l o n l l a 0 8 a m t n e r r u c t u p n i f f o e t o m e r 95 1 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 0 50 8 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 5 10 0 2k 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 2 0 . 05 0 . 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 a9 1 . 43 . 45 . 4v 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 8 . 39 4 . 4v 4 .com u datasheet
bel fuse inc. 206 van vorst street, jersey city, nj 07302 tel 201-432-0463 fax 201-432-9542 www.belfuse.com ?2004 bel fuse inc. specifications subject to change without notice. 03.04 power products non-isolated dc/dc converters bp03x7ah-08b 5v input / 0.9v ? 3.3v output / 8a page 3 output specifications note: all specifications are typical at nominal input, full load at 25 c unless otherwise stated. 1. vin = 5v, 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 3 . 3 v 5 . 2 v 8 . 1 v 5 . 1 v 2 . 1 v 0 . 1 v 9 . 0 t u o v 4 3 2 . 3 5 4 . 2 4 6 7 . 1 7 4 . 1 6 7 1 . 1 8 9 . 0 2 8 8 . 0 3 . 3 5 . 2 8 . 1 5 . 1 2 . 1 0 . 1 9 . 0 6 6 3 . 3 5 5 . 2 6 3 8 . 1 3 5 . 1 4 2 2 . 1 2 0 . 1 8 1 9 . 0 v n o i t a l u g e r d a o l v 3 . 3 v 5 . 2 v 8 . 1 v 5 . 1 v 2 . 1 v 0 . 1 v 9 . 0 6 6 6 3 3 3 3 5 1 5 1 5 1 0 1 0 1 0 1 0 1 v m n o i t a l u g e r e n i ll l a 25 v 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 ) c 5 8 + o t 0 4 - (v 3 . 3 v 5 . 2 v 8 . 1 v 5 . 1 v 2 . 1 v 0 . 1 v 9 . 0 0 2 0 2 0 1 0 1 5 5 5 3 3 5 2 8 1 5 1 0 1 0 1 0 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 3 . 3 v 5 . 2 v 8 . 1 v 5 . 1 v 2 . 1 v 0 . 1 v 9 . 0 8 2 8 2 8 1 5 1 0 1 0 1 0 1 3 5 5 4 8 3 0 3 5 2 5 2 5 2 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 50 0 1p - 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 5 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 3 . 3 v 5 . 2 v 8 . 1 v 5 . 1 v 2 . 1 v 0 . 1 v 9 . 0 e g r u s t u o i 8 0 . 0 5 0 . 0 5 0 . 0 5 0 . 0 5 0 . 0 5 0 . 0 5 0 . 0 2 . 0 1 . 0 1 . 0 1 . 0 1 . 0 1 . 0 1 . 0 a 2 s e m i t n o n r u tl l an o t 2 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 3 3f 4 .com u datasheet
bel fuse inc. 206 van vorst street, jersey city, nj 07302 tel 201-432-0463 fax 201-432-9542 www.belfuse.com ?2004 bel fuse inc. specifications subject to change without notice. 03.04 power products non-isolated dc/dc converters bp03x7ah-08b 5v input / 0.9v ? 3.3v 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/s, ta = 25 c without external load capacitance; when vout=3.3v or 2.5v a 220f aluminum cap is added 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 3 . 3 0 3 15 6 1v m e m i t g n i l t t e ss t 0 0 10 5 1s ? d a o l x a m f o % 0 5 o t % 0 0 1 v 0 3 15 6 1v m e m i t g n i l t t e ss t 0 0 10 5 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 . 2 0 3 15 6 1v m e m i t g n i l t t e ss t 0 30 6s ? d a o l x a m f o % 0 5 o t % 0 0 1 v 0 2 15 6 1v m e m i t g n i l t t e ss t 0 30 6s 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 2 15 6 1v m e m i t g n i l t t e ss t 5 20 5s ? d a o l x a m f o % 0 5 o t % 0 0 1 v 0 2 15 6 1v m e m i t g n i l t t e ss t 5 20 5s 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 5 20 5s ? 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 5 20 5s 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 5 20 5s ? 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 5 20 5s 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 0 . 1 0 70 1 1v m e m i t g n i l t t e ss t 5 20 5s ? d a o l x a m f o % 0 5 o t % 0 0 1 v 0 70 1 1v m e m i t g n i l t t e ss t 5 20 5s 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 9 . 0 0 70 1 1v m e m i t g n i l t t e ss t 5 20 5s ? d a o l x a m f o % 0 5 o t % 0 0 1 v 0 70 1 1v m e m i t g n i l t t e ss t 5 20 5s 4 .com u datasheet
bel fuse inc. 206 van vorst street, jersey city, nj 07302 tel 201-432-0463 fax 201-432-9542 www.belfuse.com ?2004 bel fuse inc. specifications subject to change without notice. 03.04 power products non-isolated dc/dc converters bp03x7ah-08b 5v input / 0.9v ? 3.3v output / 8a page 5 note: on/off pin designed to work with an open collector/drain switch. control specifications general specifications 1. vin=5v, full load and ta=25 c. 2. see graphs on page 13 - 20. 1. with remote on/off pin 1 open, the module is on. 2. signal low and signal high varies based on vin. 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 1 l l an e t u o v v ) f f o t i n u ( w o l l a n g i s 2 v 5 . 4 = n i v l l a3 . 0 - 5 3 . 1 v v 5 . 5 = n i v 5 6 . 1 ) n o t i n u ( h g i h l a n g i s 2 v 5 . 4 = n i v l l a 5 1 . 3 5 . 5v v 5 . 5 = n i v5 8 . 3 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 3 . 3 v 5 . 2 v 8 . 1 v 5 . 1 v 2 . 1 v 0 . 1 v 9 . 0 9 8 7 8 3 8 1 8 9 7 7 7 6 7 2 9 0 9 6 8 4 8 2 8 0 8 9 7 % 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 ) m i r t e d i w ( v 8 . 15 . 7 4 2 0 2% e g n a r m i r t e g a t l o v t u p t u o 2 ) m i r t w o r r a n ( v 3 . 3 v 5 . 2 v 8 . 1 v 5 . 1 v 2 . 1 v 0 . 1 v 9 . 0 0 9 0 9 0 9 0 9 0 9 0 9 5 9 0 1 1 0 1 1 0 1 1 0 1 1 0 1 1 0 1 1 0 1 1 % t h g i e wl l a 7 . 4 g 4 .com u datasheet
bel fuse inc. 206 van vorst street, jersey city, nj 07302 tel 201-432-0463 fax 201-432-9542 www.belfuse.com ?2004 bel fuse inc. specifications subject to change without notice. 03.04 power products non-isolated dc/dc converters bp03x7ah-08b 5v input / 0.9v ? 3.3v output / 8a page 6 efficiency data module 3.3v 88% 89% 90% 91% 92% 93% 94% 95% 96% 1.02.03.04.05.06.07.08.0 output current efficiency 4.5v 5.0v 5.5v module 2.5v 86% 87% 88% 89% 90% 91% 92% 93% 94% 95% 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 output current efficiency 4.5v 5.0v 5.5v module 1.8v 83% 85% 87% 89% 91% 93% 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 output current efficiency 4.5v 5.0v 5.5v module 1.5v 80% 82% 84% 86% 88% 90% 92% 1.02.03.04.05.06.07.08.0 output current efficiency 4.5v 5.0v 5.5v 4 .com u datasheet
bel fuse inc. 206 van vorst street, jersey city, nj 07302 tel 201-432-0463 fax 201-432-9542 www.belfuse.com ?2004 bel fuse inc. specifications subject to change without notice. 03.04 power products non-isolated dc/dc converters bp03x7ah-08b 5v input / 0.9v ? 3.3v output / 8a efficiency data page 7 module 1.2v 78% 80% 82% 84% 86% 88% 90% 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 output current efficiency 4.5v 5.0v 5.5v module 1.0v 76% 78% 80% 82% 84% 86% 88% 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 output current efficiency 4.5v 5.0v 5.5v module 0.9v 76% 78% 80% 82% 84% 86% 88% 1.02.03.04.05.06.07.08.0 output current efficiency 4.5v 5.0v 5.5v 4 .com u datasheet
bel fuse inc. 206 van vorst street, jersey city, nj 07302 tel 201-432-0463 fax 201-432-9542 www.belfuse.com ?2004 bel fuse inc. specifications subject to change without notice. 03.04 power products non-isolated dc/dc converters bp03x7ah-08b 5v input / 0.9v ? 3.3v output / 8a page 8 ripple and noise ripple and noise at full load and 5vdc input, 3.3vdc output and ta=25 c ripple and noise at full load and 5vdc input, 2.5vdc output and ta=25 c ripple and noise at full load and 5vdc 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 5vdc input, 1.5vdc output and ta=25 c 4 .com u datasheet
bel fuse inc. 206 van vorst street, jersey city, nj 07302 tel 201-432-0463 fax 201-432-9542 www.belfuse.com ?2004 bel fuse inc. specifications subject to change without notice. 03.04 power products non-isolated dc/dc converters bp03x7ah-08b 5v input / 0.9v ? 3.3v output / 8a ripple and noise ripple and noise at full load and 5vdc input, 1.0vdc output and ta=25 c ripple and noise at full load and 5vdc input, 0.9vdc output and ta=25 c 1f ceramic cap and 10f aluminum electrolytic cap added at the output. ripple and noise at full load and 5vdc input, 1.2vdc output and ta=25 c page 9 4 .com u datasheet
bel fuse inc. 206 van vorst street, jersey city, nj 07302 tel 201-432-0463 fax 201-432-9542 www.belfuse.com ?2004 bel fuse inc. specifications subject to change without notice. 03.04 power products non-isolated dc/dc converters bp03x7ah-08b 5v input / 0.9v ? 3.3v output / 8a page 10 transient response transient response: di/dt = 0.5a/s, no external load capacitance. note: 3.3vdc and 2.5vdc output with external 220uf aluminum capacitance. vout=3.3v 50% to 100% load transients at 5v input and ta=25 c vout=3.3v 100% to 50% load transients at 5v input and ta=25 c vout=2.5v 50% to 100% load transients at 5v input and ta=25 c vout=2.5v 100% to 50% load transients at 5v input and ta=25 c vout=1.8v 50% to 100% load transients at 5v input and ta=25 c vout=1.8v 100% to 50% load transients at 5v input and ta=25 c 4 .com u datasheet
bel fuse inc. 206 van vorst street, jersey city, nj 07302 tel 201-432-0463 fax 201-432-9542 www.belfuse.com ?2004 bel fuse inc. specifications subject to change without notice. 03.04 power products non-isolated dc/dc converters bp03x7ah-08b 5v input / 0.9v ? 3.3v output / 8a page 11 transient response transient response: di/dt = 0.5a/s, no external load capacitance vout=1.2v 50% to 100% load transients at 5v input and ta=25 c vout=1.5v 50% to 100% load transients at 5v input and ta=25 c vout=1.5v 100% to 50% load transients at 5v input and ta=25 c vout=1.2v 100% to 50% load transients at 5v input and ta=25 c vout=1.0v 50% to 100% load transients at 5v input and ta=25 c vout=1.0v 100% to 50% load transients at 5v input and ta=25 c 4 .com u datasheet
bel fuse inc. 206 van vorst street, jersey city, nj 07302 tel 201-432-0463 fax 201-432-9542 www.belfuse.com ?2004 bel fuse inc. specifications subject to change without notice. 03.04 power products non-isolated dc/dc converters bp03x7ah-08b 5v input / 0.9v ? 3.3v output / 8a page 12 thermal considerations V7AH-08B s7ah-08b transient response transient response: di/dt = 0.5a/s, no external load capacitance vout=0.9v 50% to 100% load transients at 5v input and ta=25 c vout=0.9v 100% to 50% load transients at 5v input and ta=25 c 4 .com u datasheet
bel fuse inc. 206 van vorst street, jersey city, nj 07302 tel 201-432-0463 fax 201-432-9542 www.belfuse.com ?2004 bel fuse inc. specifications subject to change without notice. 03.04 power products non-isolated dc/dc converters bp03x7ah-08b 5v input / 0.9v ? 3.3v output / 8a page 13 output voltage set-point adjustment vo tr i m gnd vo tr i m gnd trim down test circuit trim up test circuit x7ah-08b1a0 trim resistor calculation 0.85 0.94 1.04 1.14 1.23 1.33 1.42 1.52 1.61 1.71 1.8 0 300 600 900 1200 1500 1800 2100 2400 2700 3000 a djus ted output voltage vo,adj (v) trim resistor value rtrim_down(ohm) 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 3.8 0 300 600 900 1200 1500 1800 2100 2400 2700 3000 a djus ted output voltage vo,adj(v) trim resistor value,rtrim_up(ohm) ohm adj vo vo r down trim ) 1 . 261 , 362 . 250 ( ? ? = ? ohm vo adj vo r up trim ) 1 . 12 , 2 . 199 ( ? ? = ? where , vo is the nominal out p ut volta g e set p oint when trim p in is o p en , vo=1.805v vo , ad j is the ad j usted out p ut volta g e. rtrim-down is the resistance re q uired between trim and vo. vo is the nominal out p ut volta g e set p oint when trim p in is o p en , vo=1.805v vo , ad j is the ad j usted out p ut volta g e. rtrim-u p is the resistance re q uired between trim and gnd. where , 4 .com u datasheet
bel fuse inc. 206 van vorst street, jersey city, nj 07302 tel 201-432-0463 fax 201-432-9542 www.belfuse.com ?2004 bel fuse inc. specifications subject to change without notice. 03.04 power products non-isolated dc/dc converters bp03x7ah-08b 5v input / 0.9v ? 3.3v output / 8a output voltage set-point adjustment x7ah-08b330 trim resistor calculation page 14 2.8 2.85 2.9 2.95 3 3.05 3.1 3.15 3.2 3.25 3.3 500 2000 3500 5000 6500 8000 9500 1.1 . 10 4 1.25 . 10 4 1.4 . 10 4 1.55 . 10 4 a djus ted output voltage vo,adj (v) trim resistor value rtrim_down(ohm) 3.3 3.35 3.4 3.45 3.5 3.55 3.6 3.65 3.7 3.75 3.8 0 1000 2000 3000 4000 5000 6000 7000 8000 9000 1 . 10 4 a djus ted output voltage vo,adj(v) trim resistor value,rtrim_up(ohm) ohm adj vo vo r down trim ) 651 , 741 . 623 ( ? ? = ? ohm vo adj vo r up trim ) 402 , 2 . 199 ( ? ? = ? where , vo is the nominal out p ut volta g e set p oint when trim p in is o p en , vo=3.305v vo , ad j is the ad j usted out p ut volta g e. rtrim-down is the resistance re q uired between trim and vo. vo is the nominal out p ut volta g e set p oint when trim p in is o p en , vo=3.305v vo , ad j is the ad j usted out p ut volta g e. rtrim-u p is the resistance re q uired between trim and gnd. where , 4 .com u datasheet
bel fuse inc. 206 van vorst street, jersey city, nj 07302 tel 201-432-0463 fax 201-432-9542 www.belfuse.com ?2004 bel fuse inc. specifications subject to change without notice. 03.04 power products non-isolated dc/dc converters bp03x7ah-08b 5v input / 0.9v ? 3.3v output / 8a output voltage set-point adjustment x7ah-08b250 trim resistor calculation page 15 2.1 2.14 2.18 2.22 2.26 2.3 2.34 2.38 2.42 2.46 2.5 0 1500 3000 4500 6000 7500 9000 1.05 . 10 4 1.2 . 10 4 1.35 . 10 4 1.5 . 10 4 a djus ted output voltage vo,adj (v) trim resistor value rtrim_down(ohm) 2.5 2.54 2.58 2.62 2.66 2.7 2.74 2.78 2.82 2.86 2.9 0 1000 2000 3000 4000 5000 6000 7000 8000 9000 1 . 10 4 a djus ted output voltage vo,adj(v) trim resistor value,rtrim_up(ohm) ohm adj vo vo r down trim ) 760 , 933 . 423 ( ? ? = ? ohm vo adj vo r up trim ) 511 , 2 . 199 ( ? ? = ? where , vo is the nominal out p ut volta g e set p oint when trim p in is o p en , vo=2.503v vo , ad j is the ad j usted out p ut volta g e. rtrim-down is the resistance re q uired between trim and vo. where , vo is the nominal out p ut volta g e set p oint when trim p in is o p en , vo=2.503v vo , ad j is the ad j usted out p ut volta g e. rtrim-u p is the resistance re q uired between trim and gnd. 4 .com u datasheet
bel fuse inc. 206 van vorst street, jersey city, nj 07302 tel 201-432-0463 fax 201-432-9542 www.belfuse.com ?2004 bel fuse inc. specifications subject to change without notice. 03.04 power products non-isolated dc/dc converters bp03x7ah-08b 5v input / 0.9v ? 3.3v output / 8a output voltage set-point adjustment x7ah-08b180 trim resistor calculation page 16 1.5 1.53 1.56 1.59 1.62 1.65 1.68 1.71 1.74 1.77 1.8 0 1500 3000 4500 6000 7500 9000 1.05 . 10 4 1.2 . 10 4 1.35 . 10 4 1.5 . 10 4 a djus ted output voltage vo,adj (v) trim resistor value rtrim_down(ohm) 1.8 1.83 1.86 1.89 1.92 1.95 1.98 2.01 2.04 2.07 2.1 0 1000 2000 3000 4000 5000 6000 7000 8000 9000 1 . 10 4 a djus ted output voltage vo,adj(v) trim resistor value,rtrim_up(ohm) ohm adj vo vo r down trim ) 760 , 362 . 250 ( ? ? = ? ohm vo adj vo r up trim ) 511 , 2 . 199 ( ? ? = ? vo is the nominal out p ut volta g e set p oint when trim p in is o p en , vo=1.805v vo , ad j is the ad j usted out p ut volta g e. rtrim-down is the resistance re q uired between trim and vo. vo is the nominal out p ut volta g e set p oint when trim p in is o p en , vo=1.805v vo , ad j is the ad j usted out p ut volta g e. rtrim-u p is the resistance re q uired between trim and gnd. where , where , 4 .com u datasheet
bel fuse inc. 206 van vorst street, jersey city, nj 07302 tel 201-432-0463 fax 201-432-9542 www.belfuse.com ?2004 bel fuse inc. specifications subject to change without notice. 03.04 power products non-isolated dc/dc converters bp03x7ah-08b 5v input / 0.9v ? 3.3v output / 8a output voltage set-point adjustment x7ah-08b150 trim resistor calculation page 17 1.35 1.37 1.38 1.4 1.41 1.43 1.44 1.46 1.47 1.49 1.5 0 1500 3000 4500 6000 7500 9000 1.05 . 10 4 1.2 . 10 4 1.35 . 10 4 1.5 . 10 4 adj us ted output volt age vo,adj (v) trim resistor value rtrim_down(kohm) 1.5 1.51 1.53 1.54 1.56 1.58 1.59 1.61 1.62 1.64 1.65 0 1500 3000 4500 6000 7500 9000 1.05 . 10 4 1.2 . 10 4 1.35 . 10 4 1.5 . 10 4 adjusted output voltage vo,adj(v) trim resistor value,rtrim_up(kohm) ohm adj vo vo r down trim ) 522 , 255 . 122 ( ? ? = ? ohm vo adj vo r up trim ) 348 , 2 . 139 ( ? ? = ? where , vo is the nominal out p ut volta g e set p oint when trim p in is o p en , vo=1.503v vo , ad j is the ad j usted out p ut volta g e. rtrim-u p is the resistance re q uired between trim and gnd. vo is the nominal out p ut volta g e set p oint when trim p in is o p en , vo=1.503v vo , ad j is the ad j usted out p ut volta g e. rtrim-down is the resistance re q uired between trim and vo. where , 4 .com u datasheet
bel fuse inc. 206 van vorst street, jersey city, nj 07302 tel 201-432-0463 fax 201-432-9542 www.belfuse.com ?2004 bel fuse inc. specifications subject to change without notice. 03.04 power products non-isolated dc/dc converters bp03x7ah-08b 5v input / 0.9v ? 3.3v output / 8a output voltage set-point adjustment x7ah-08b120 trim resistor calculation page 18 1 1.02 1.04 1.06 1.08 1.1 1.12 1.14 1.16 1.18 1.2 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 a djus ted output voltage vo,adj (v) trim resistor value rtrim_down(ohm) 1.2 1.22 1.24 1.26 1.28 1.3 1.32 1.34 1.36 1.38 1.4 0 1000 2000 3000 4000 5000 6000 7000 8000 9000 1 . 10 4 a djus ted output voltage vo,adj(v) trim resistor value,rtrim_up(ohm) where, ohm adj vo vo r down trim ) 200 , 38 . 40 ( ? ? = ? ohm vo adj vo r up trim ) 100 , 80 ( ? ? = ? vo is the nominal out p ut volta g e set p oint when trim p in is o p en , vo=1.204v vo , ad j is the ad j usted out p ut volta g e. rtrim-down is the resistance re q uired between trim and vo. where, vo is the nominal out p ut volta g e set p oint when trim p in is o p en , vo=1.204v vo , ad j is the ad j usted out p ut volta g e. rtrim-u p is the resistance re q uired between trim and gnd. 4 .com u datasheet
bel fuse inc. 206 van vorst street, jersey city, nj 07302 tel 201-432-0463 fax 201-432-9542 www.belfuse.com ?2004 bel fuse inc. specifications subject to change without notice. 03.04 power products non-isolated dc/dc converters bp03x7ah-08b 5v input / 0.9v ? 3.3v output / 8a output voltage set-point adjustment x7ah-08b100 trim resistor calculation page 19 0.85 0.86 0.88 0.9 0.91 0.93 0.94 0.95 0.97 0.98 1 0 100 200 300 400 500 600 700 800 900 1000 a djus ted output voltage vo,adj (v) trim resistor value rtrim_down(ohm) 1 1.02 1.04 1.06 1.08 1.1 1.12 1.14 1.16 1.18 1.2 0 1000 2000 3000 4000 5000 6000 7000 8000 9000 1 . 10 4 a djus ted output voltage vo,adj(v) trim resistor value,rtrim_up(ohm) ohm adj vo vo r down trim ) 2 . 63 , 544 . 10 ( ? ? = ? ohm vo adj vo r up trim ) 1 . 12 , 88 . 40 ( ? ? = ? where, vo is the nominal out p ut volta g e set p oint when trim p in is o p en , vo=1.006v vo , ad j is the ad j usted out p ut volta g e. rtrim-down is the resistance re q uired between trim and vo. vo is the nominal out p ut volta g e set p oint when trim p in is o p en , vo=1.006v vo , ad j is the ad j usted out p ut volta g e. rtrim-u p is the resistance re q uired between trim and gnd. where, 4 .com u datasheet
bel fuse inc. 206 van vorst street, jersey city, nj 07302 tel 201-432-0463 fax 201-432-9542 www.belfuse.com ?2004 bel fuse inc. specifications subject to change without notice. 03.04 power products non-isolated dc/dc converters bp03x7ah-08b 5v input / 0.9v ? 3.3v output / 8a output voltage set-point adjustment x7ah-08b090 trim resistor calculation page 20 0.85 0.855 0.86 0.865 0.87 0.875 0.88 0.885 0.89 0.895 0.9 0 40 80 120 160 200 240 280 320 360 400 a djus ted output voltage vo,adj (v) trim resistor value rtrim_down(ohm) 0.9 0.91 0.92 0.93 0.94 0.95 0.96 0.97 0.98 0.99 1 0 1000 2000 3000 4000 5000 6000 7000 8000 9000 1 . 10 4 a djus ted output voltage vo,adj(v) trim resistor value,rtrim_up(ohm) ohm adj vo vo r down trim ) 2 . 38 , 751 . 2 ( ? ? = ? ohm vo adj vo r up trim ) 1 . 12 , 88 . 20 ( ? ? = ? vo is the nominal out p ut volta g e set p oint when trim p in is o p en , vo=0.905v vo , ad j is the ad j usted out p ut volta g e. rtrim-down is the resistance re q uired between trim and vo. vo is the nominal out p ut volta g e set p oint when trim p in is o p en , vo=0.905v vo , ad j is the ad j usted out p ut volta g e. rtrim-u p is the resistance re q uired between trim and gnd. where, where, 4 .com u datasheet
bel fuse inc. 206 van vorst street, jersey city, nj 07302 tel 201-432-0463 fax 201-432-9542 www.belfuse.com ?2004 bel fuse inc. specifications subject to change without notice. 03.04 power products non-isolated dc/dc converters bp03x7ah-08b 5v input / 0.9v ? 3.3v output / 8a mechanical page 21 s7ah-08b 0.400 [10.16] 0.60 [15.24] 0.70 [17.78] 0.050 [1.27] 0.100 [2.54] 4x 0.400 [10.16] 0.012 [0.30] 0.050 [1.27] 0.020 [0.51] 0.320 [8.13] 0.780 [19.81] 0.055 [1.40] 2x 0.090 [2.29] 2x 0.004 [0.10] 0?-5? r0.015 [r0.38] typ r0.008 [r0.20] typ 0.100 [2.54] 0.855 [21.72] 0.065 [1.65] 0.110 [2.79] suggested pcb pad layout dimensions are in inches [millimeters]. standard dimension tolerance is ?.005 [0.13] unless otherwise noted. 1 2 3 4 5 6 7 n i p n o i t c n u f 1f f o / n o e t o m e r 2n i v + 3d n u o r g 4o v + 5m i r t 6n o i t c e n n o c o n 7n o i t c e n n o c o n 4 .com u datasheet
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 ?2004 bel fuse inc. specifications subject to change without notice. 03.04 power products non-isolated dc/dc converters bp03x7ah-08b 5v input / 0.9v ? 3.3v output / 8a mechanical page 22 V7AH-08B 0.700 [17.78] 0.600 [15.24] 0.050 [1.27] 0.265 [6.73] min 0.020 [0.51] 0.308 [7.82] 0.050 [1.27] 0.100 [2.54] 0.400 [10.16] dimensions are in inches [millimeters]. standard dimension tolerance is ?.005 [0.13] unless otherwise noted. 2 4 3 5 1 n i p n o i t c n u f 1f f o / n o e t o m e r 2n i v + 3d n u o r g 4o v + 5m i r t 4 .com u datasheet

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