1 NT3875A/b conceptual noveltek semiconductor corp., http://www.noveltek-semi.com rev. c30, file name: nt3875-ds-c3000 the nt3875 is a step down pwm converter with driving a output current up to 2a (NT3875A) a nd 1a (nt3875b) without a ddition al tra n sistor . it is de signed to allow f o r operating a wide supply voltage ra nge from 8v to 40v . the extern al shutdown function ca n be controlled by logic level to pull comp/en pin down, a nd then comes into sta ndby mode. the extern al compen sation ma ke s feedba ck control have good line a nd loa d regulation with flexible extern al design. the nt3875 fe ature s a progra mma ble cv/cc mode control function s. the cv mode (con sta nt voltage) function provides a regulated voltage output a nd the cc mode (con sta nt current) function provide s a current li mitation function. the cc current value is set by external resister during current sen se a m plif ier in put stage. the nt3875 is suita ble f or the dc/dc switching power a pplication s when reque sted the current li mit function. the devices are availa ble in sop-8l a nd psop-8l pa ck age s a nd require very few extern al device s f or operation. ? ? ? ? ? v in operate with 8v ~ 40v supply v oltage ? ? ? ? ? v out accura cy (v ref =1.2v) + 1.0% over line v oltage ? ? ? ? ? cc / cv mode control (constant current and con sta nt v oltage) ? ? ? ? ? +/- 5% current limit accuracy ? ? ? ? ? output short circuit protection ? ? ? ? ? output over v oltage prote ction (~120%) ? ? ? ? ? over t e mperature prote ction ? ? ? ? ? internal soft start ~ 7ms ? ? ? ? ? fixed frequency 120 khz ? ? ? ? ? uvlo protection (min=6v , typ=7v , max=8v) ? ? ? ? ? duty cycle range (0~90%) ? ? ? ? ? single pin to external compensation and shutdown control ? ? ? ? ? integrated power n-mosfet ? ? ? ? ? rds_on=150m ohm for NT3875A ? ? ? ? ? rds_on=240m ohm for nt3875b ? ? ? ? ? (p)sop- 8l package r e b m u n r e d r oe g a k c a pk r a m e r 8 a s a 5 7 8 3 t nl 8 - p o sa 2 = t n e r r u c t u p t u o 8 w s a 5 7 8 3 t nl 8 - p o s pa 2 = t n e r r u c t u p t u o 8 a s b 5 7 8 3 t nl 8 - p o sa 1 = t n e r r u c t u p t u o ? ? ? ? ? car charger ? ? ? ? ? portable charger devices ? ? ? ? ? high-brightness lighting ? ? ? ? ? general-purpose dc/dc converters with current limit general description applications ordering information features w ide in put ra nge cc/cv ste p down converter note: n t products are compatible with the current ipc/ jedec j-st d-020 require ment. they are halogen-free, rohs compliant and 100% matte tin (sn) plating that are suitable for use in snpb or pb-free soldering processes. pin configuration comp/en bst gn d lx fb i sen - isen+ vc c 1 2 3 45 6 7 8 so p - 8l / psop - 8 l http://
2 conceptual NT3875A/b noveltek semiconductor corp., http://www.noveltek-semi.com rev . c30, file n a me: nt3875-ds-c3000 . o ne m a n n i pn o i t c n u f n i p 1c c v t u p n i y l p p u s r e w o p e s o l c s a d e c a l p , d n g o t r o t i c a p a c c i m a r e c f u 0 1 a h t i w n i p s i h t s s a p y b . . e l b i s s o p s a c i e h t o t 2b f . n i p k c a b d e e f r e d i v i d r o t s i s e r e h t o t t c e n n o c . v 2 . 1 o t d e t a l u g e r s i n i p s i h t t a e g a t l o v e h t . e g a t l o v t u p t u o e h t t e s o t d n g d n a t u p t u o n e e w t e b 3n e / p m o c . t u p t u o r e i f i l p m a r o r r e t u p n i g n i t r e v n i - n o n e h t d n a ) a e ( r e i f i l p m a r o r r e e h t f o t u p t u o e h t s i s i h t e g a t l o v e h t e t a s n e p m o c o t n i p n e s v e h t h t i w n o i t a n i b m o c n i n i p s i h t e s u . r o t a r a p m o c m w p e h t f o s e l b a s i d l a n i m o n v 4 . 0 w o l e b l e v e l a o t n e / p m o c g n i l l u p . r e t r e v n o c e h t f o p o o l k c a b d e e f l o r t n o c . w o l d l e h s t u p t u o e t a g l d n a e t a g u e h t s e k a m d n a , p o t s o t r o t a l l i c s o e h t s e s u a c , r e l l o r t n o c e h t 4d n g . d n u o r g , n e s v n r u t e r , n o i t a p i s s i d t a e h t s e b r o f a e r a r e p p o c b c p e g r a l a o t n i p s i h t t c e n n o c e s i o n t s e b r o f t n i o p e l g n i s a t a d n g r e w o p o t d n g s i h t t c e n n o c d n a d n g s i h t o t p m o c d n a . y t i n u m m i 5+ n e s i . n i p ) + ( t u p n i e s n e s t n e r r u c e h t 6- n e s i ( t u p n i e s n e s t n e r r u c e h t - . n i p ) 7t s b . n i p p a r t s t o o b r e v i r d e t a g t e f s o m r e h g i h l a n r e t n i e h t o t r e w o p s e d i v o r p s i h t . f n 0 1 a t c e n n o c . n i p x l o t n i p t s b m o r f r o t i c a p a c 8x l . r o t c u d n i l a n r e t x e o t t u p t u o g n i h c t i w s r e w o p functional pin description typical application circuit v in v ou t lx isen+ bs t vcc co m p / e n rs gnd isen- fb r1 r2 r3 0r 0r
3 NT3875A/b conceptual noveltek semiconductor corp., http://www.noveltek-semi.com rev. c30, file name: nt3875-ds-c3000 functional block diagram gate control driver ocp fb error amp. vcc comp/en fault logics over temperature protection 5v oscillator 120khz ovp driver 5v 5v current sense amplifier s l ope co m p e n sa t o r ra mp bst lx gnd 1 20% v re f v re f por c u rre nt s e n s e a m p l if ier isen- isen+ cc control loop internal regulator 0.4v enable enable 0.6v isen+ cable comp 25% v re f uvp
4 conceptual NT3875A/b noveltek semiconductor corp., http://www.noveltek-semi.com rev. c30, file name: nt3875-ds-c3000 supply in put v oltage, v cc (note1) ------------------------------------------------------------------------------------------- -0.3v to +45v bst to lx -------------------------------------------------------------------------------------------------- 0.3v to +7v lx to gnd dc---------------------------------------------------------------------------------------------- -1v to +vin+1v bst to gnd dc--------------------------------------------------------------------------------------------- vsw -0.3 to vsw+7v fb, comp to gnd dc----------------------------------------------------------------------------------------------- 0.3v to +7v isen-, isen+ to gnd dc----------------------------------------------------------------------------------------------- 0.3v to + 9v storage t e mperature ra nge ------------------------------------------------------------------------------------------- -65 o c to +150 o c junction t e mperature ---------------------------------------------------------------------------------------------------------- - -20 o c to +150 o c le a d t e mperature ra nge(soldering 10se c) ------------------------------------------------------------------------------------------ 260 o c esd rating (note2) hbm(huma n body mode)--------------------------------------------------------------------------------------------------------- ----2kv mm(mechine mode)------------------------------------------------------------------------------------------------------------- ----------------200v absolute maximum rating thermal information pa ck age thermal resista nce (note 3) sop-8l ja ------------------------------------------------------------------------------------------------------------------------ 160 o c/w sop-8l jc ----------------------------------------------------------------------------------------------------------------------39 o c/w psop-8l ja ------------------------------------------------------------------------------------------------------------------------ 50 o c/w psop-8l jc ---------------------------------------------------------------------------------------------------------------------- 5 o c/w power dissi pation, p d @ t a = 25 c sop-8l ----------------------------------------------------------------------------------------------------------------------- - 0.63w psop-8l ---------------------------------------------------------------------------------------------------------------------- -- 2w note 1. stre sse s listed a s the a b ove ? absolute m axi mum rati ngs? may ca use perma nent da mage to the device. the se are f or stress ratings. function al operation of the device at the se or a ny other condition s beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating condition s f or extended periods may re main possibility to af fe ct device reli a bility . note 2. device s are esd sen sitive. ha ndling pre caution re commended. note 3. ja is me a sured in the n atural conve ction at t a = 25 c on a high ef fe ctive thermal conductivity test board of jedec 51-7 thermal me a sure ment sta ndard. note 4. the device is not guaranteed to function outside its operating conditions.
5 NT3875A/b conceptual noveltek semiconductor corp., http://www.noveltek-semi.com rev. c30, file name: nt3875-ds-c3000 electrical characteristics r e t e m a r a pl o b m y ss n o i t i d n o c t s e tn i mp y tx a m s t i n u t u p n i y l p p u s e g n a r e g a t l o v y l p p u sv c c 8- -0 4v t n e r r u c t u p n i y l p p u s i q c c d n g = n e / p m o c- -3 . 05 . 0a m i c c - -5 0 1a m t e s e r - n o - r e w o p d l o h s e r h t r o p c c vv h t r c c . g n i s i r c c v7 7 . 78 v d l o h s e r h t r o p c c vv h t f c c g n i l l a f c c v6 7 . 67 v r o t a l l i c s o y c n e u q e r f m w p l a m r o nf c s o - -0 2 1- -z h k t a 5 2 - = o 0 8 o t c o c2 0 1- -8 3 1z h e m i t - n o m u m i n i mt n i m - n o - -0 0 2- -s n e g n a r e l c y c y t u dy t u d0 - -0 9% e c n e r e f e r e g a t l o v e c n e r e f e rv f e r - -2 . 1- -v e c n a r e l o t e g a t l o v e c n e r e f e r 1 -- -1 +% v f e r r o t a s n e p m o c d a o l v n e s i v m 5 1 1 =5 . 2% r e i f i l p m a r o r r e m w p t n e r r u c t u p n i b fi b f v b f v 2 . 1 =- -1 . 01 a u e g a t l o v h g i h p m o cv h _ p m o c - -5 . 5- -v e g a t l o v w o l p m o cv l _ p m o c - -8 . 0- -v d l o h s e r h t n w o d t u h s p m o c e g a t l o v - -4 . 0- -v t n e r r u c e c r u o s p m o cv p m o c v = h _ p m o c v 1 -- -2 4- -a u t n e r r u c k n i s p m o cv p m o c v 1 =- -2 4- -a u r e i f i l p m a e s n e s t n e r r u c n e e w t e b e g a t l o v e c n e r e f f i d + n e s i d n a - n e s i v n e s i - -5 1 1- -v m n o i t c e t o r p l e v e l e g a t l o v r e v o b fv p v o v f o t n e c e r f e r - -0 2 1- -% l e v e l e g a t l o v r e d n u b fv p v u v f o t n e c e r f e r 5 2% t i m i l t n e r r u ci m i l 5 . 4a n w o d t u h s e r u t a r e p m e t r e v o - -0 6 1- - o c s i s e r e t s y h e r u t a r e p m e t r e v o - -0 4- - o c t r a t s t f o s e m i t t r a t s t f o ss s t7 s m e m i t e l c y c e r 0 6 2s m ( v cc = 12v, t a = +25 o c unless otherwise specified.)
6 conceptual NT3875A/b noveltek semiconductor corp., http://www.noveltek-semi.com rev. c30, file name: nt3875-ds-c3000 typical operation characteristics this page is intentionally left blank and will be updated later.
7 NT3875A/b conceptual noveltek semiconductor corp., http://www.noveltek-semi.com rev. c30, file name: nt3875-ds-c3000 note 1. pa ck age outline u nit de scri ption: bsc: ba sic. re pre sents theoretical exa ct di men sion or di men sion target min: minimum dimension specified. max: maximum dimension specified. ref: reference. re pre sents di men sion f or reference use only . this value is not a device spe cif ication. typ . t ypical. provided a s a general value. this value is not a device spe cif ication. 2 . dimensions in millimeters. 3 . drawing not to scale. 4. the se di men sion s do not include mold fla sh or protrusion s. mold fla sh or protrusion s shall not exceed 0.15mm. package information sop-8l 0.32 - 0.52 4.80 - 5.00 5.80 - 6.20 3.81 bsc 0.10 - 0.25 0.18 - 0.25 0.41 - 0.89 1. 27 b s c 3. 80 - 4 . 00 recommended solder pad layout 1.75 max 1.45 - 1.60 7.00 10 0. 1.50 10 0. 0. 70 1 0 0. 1. 27 1 0 0. 5.50 10 0. 4.00 10 0.
8 conceptual NT3875A/b noveltek semiconductor corp., http://www.noveltek-semi.com rev. c30, file name: nt3875-ds-c3000 package information psop-8l note 1. pa ck age outline u nit descri ption: bsc: ba sic. re pre sents theoretical exa ct di men sion or di men sion target min: minimum dimension specified. max: maximum dimension specified. ref: reference. re pre sents di men sion f or reference use only . this value is not a device spe cif ication. typ . t ypical. provided a s a general value. this value is not a device spe cif ication. 2 . dimensions in millimeters. 3 . drawing not to scale. 4.these dimensions do not include mold flash or protrusions. mold flash or protrusions shall not exceed 0.15mm. 0.32 - 0.52 4.80 - 5.00 5.80 - 6.20 0.18 - 0.25 0.40 - 0.90 1. 27 b s c 3 . 80 - 4 . 00 recommended solder pad layout 1.90 - 2.45 2.60 - 3.40 7.00 10 0. 1.50 10 0. 0. 70 1 0 0. 1. 27 1 0 0. 5.50 10 0. 4.00 10 0. 2.30 10 0. 3. 20 1 0 0. 3.81 bsc 0.05 - 0.15 1. 75 m a x 1.45 - 1.60
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