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a t 1366 pr eliminar y produ ct inf o rmat i on 1mhz,800m a s y nchr onous buck controll er featur es ? h i gh ef f i ci e n c y (95% ) pos s i bl e ? n o s c h o t t k y d i ode r e qu i r ed ? 800 m a o u t p u t cu rren t at 5 v i n pu t 3.3v ou t p u t ? o s cillatio n f r eq u e n c y 1 . 0 m hz ? b u i l t - in o n /of f fu n c tio n ? l o w d r opou t o p erat i o n : 100% d u t y cy cl e ? s t an d - by cu r r e n t m a x . 1 a ? in p u t v o lta g e : 2 . 5 v ~5 .5 v applic at ions ? po w e r su ppl y f o r port a bl e d e v i ces g e ner a l d e scr i pt ion t h e a t 136 6 prov i d es com p l e t e con t rol f o r a dc /d c con v e rter opti m ized for h i g h - p erf o r m a n ce m i croproces s o r appl i cat i o n s . it i s operat e d on cu rren t m ode arch itect u r e f o r ex cellen t li n e an d l o ad t r an s i ent res pon s e . 1mh z operat i o n f r equ e n c y is allo w i n g th e us e of s m all s u rf ace m o un t i n du ctor an d capacitor. t h e in tern al s y n c h r on o u s s w itc h in creas es e f f i cie n c y an d eli m i n ates t h e n eed f o r a n ex t e rn al s c h o t t ky di ode. t h e a t 1366 i s a f a m i l y o f l o w - no i s e s ync hr o n o u s st e p -d o w n d c / d c con v e rters th at is ideall y s u ited f o r s y s t e m s po w e red f r o m a 1- cel l l i - i o n bat t e r y or f r o m a 3 - cell to 4 - cell ni cd , nimh, o r alk a lin e b a tter y . it can als o be u s ed to usb - b a s e d pow er s y s t e m . block diagram a i mtr on r e s erve s th e ri gh t with out no ti ce t o chang e this cir c ui try and spec i f ic ation s . 2f , no.1 0, pr os per it y r d . ii , sc ie nc e- bas e d in dus tr i a l par k , hs inc hu 3 00,t a i w an , r.o . c. t e l: 886- 3- 56 3- 087 8 w w w : h ttp :// w w w . ai m t ro n . co m . t w f a x : 886- 3- 5 63- 0 879 e m a i l : s e r v i ce@ ai m t ron . co m . t w 0 5 / 0 4 / 2 1 1
a t 1366 pr eliminar y produ ct inf o rmat i on 1mhz,800m a s y nchr onous buck controll er p i n c o nfigur at ion o r d eri n g in f o rm ati o n part nu m b er pack age m a rk ing a t 1366x s o t - 2 5 a t 1366x _g r e s o t - 25, g r een , da te cod e w i th on e b o tto m lin e : date c o d e p i n d e scr i pt ion s y m b o l p i n no. descri p t run 1 o n / o f f co n t ro l g nd 2 p o w e r gr o und sw 3 sw i t c h n ode c o n n ect i o n t o indu ct or vin 4 p o w e r su ppl y fb 5 o u t put f eedback 2f , no.1 0, pr os per it y r d . ii , sc ie nc e- bas e d in dus tr i a l par k , hs inc hu 3 00,t a i w an , r.o . c. t e l: 886- 3- 56 3- 087 8 w w w : h ttp :// w w w . ai m t ro n . co m . t w f a x : 886- 3- 5 63- 0 879 e m a i l : s e r v i ce@ ai m t ron . co m . t w 0 5 / 0 4 / 2 1 2
a t 1366 pr eliminar y produ ct inf o rmat i on 1mhz,800m a s y nchr onous buck controll er absolute maxim u m ra tings ra ted v a lue para m e ter co ndit i o n mi n . m a x . unit pow e r su pply v o l t a g e ? - 0 . 3 + 6 . 0 v run,fb - 0 .3 v i n v in p u t p i n v o ltag e sw - 0 .3 vin+0 . 3 v p - cha n ne l s w i t c h so ur c e c u r r e nt (dc ) ? - 1 0 0 0 m a n - cha n ne l s w i t c h si n k c u r r e nt (dc ) ? - 1 0 0 0 m a p e a k sw si nk a n d so ur c e c u r r e nt ? - 1 . 5 a t h erm a l r e s i s t a n ce f r o m junct i on to am b i e n t t ja s o t 2 5 - 1 6 5 0 c/w operatin g te m p eratu r e t a ? - 3 5 + 8 5 0 c s t orag e t e m p erat u r e ? - 55 +150 0 c str e sse s b e yo nd tho s e l i ste d unde r ? a bsol ute m a xi m u m ra ti ng s? m a y c a us e pe r m a n e n t da m a g e to th e de vi c e . t h e s e a r e s t res s r a t i n g s on l y , an d fu n c t i on a l op er at i o n of t h e d e v i c e at t h es e or an y ot h er c o n d i t i on s b e yon d t h os e in d i c a t e d in t h e o p e r a t i o n a l se c t i o ns of the spe c i f i c a t i o ns i s n o t i m pl i e d. e x po su r e to a b sol u te m a xi m u m r a ti ng c o ndi ti ons f o r e x te nde d p eri od s m ay a f fect d e v i c e r e l i ab il it y . r e c o m m e nde d ope r a t i ng c o ndit i on s ( t a=+25 0 c) va l u e s para m e ter sy m b o l m i n . t y p . m a x . unit p o w e r s u p p l y vo l t a ge v in 2 . 5 - - 5 . 5 operatin g te m p eratu r e * t a - 2 0 + 2 5 + 8 5 c o p e r a t i ng j u nc t i o n t e mp e r a t ur e t j - - + 1 5 0 c * u si n g x 5 r or x 7 r i nput c a p a c i tor s . 2f , no.1 0, pr os per it y r d . ii , sc ie nc e- bas e d in dus tr i a l par k , hs inc hu 3 00,t a i w an , r.o . c. t e l: 886- 3- 56 3- 087 8 w w w : h ttp :// w w w . ai m t ro n . co m . t w f a x : 886- 3- 5 63- 0 879 e m a i l : s e r v i ce@ ai m t ron . co m . t w 0 5 / 0 4 / 2 1 3
a t 1366 pr eliminar y produ ct inf o rmat i on 1mhz,800m a s y nchr onous buck controll er e l ectri cal ch ara c te ri sti c s ( v in = 3 . 6 v ,t a =+25 : , unl ess o t herw i s e not ed. ) va l u e s para m e ter sy m b o l co ndit i o n m i n. t y p . m a x . unit in pu t su ppl y r a ng e v in 2 . 5 - - 5 . 5 v qu iesce n t cu rre n t * i s fb=0.8v , i lo a d =0a a c t i v e mode -- 3 0 0 -- a c u rrent i n s t an db y m ode i st run=0 v , vin=5 . 5 v -- 0 . 5 1 a feedback voltag e v fb t a =- 20 : to + 8 5 : 0.784 0 . 8 0 0 0 . 8 1 6 v feedback voltag e lin e - reg u latio n v fb- l ine v c c = 2.5v t o 5.5v -- 0 . 1 0 . 5 % feedback variation w i th t e m p eratu r e t a =- 20 : to + 8 5 : -- 0 . 5 1 . 0 % feedback cu rren t i fb -- - - 200 na peak in du ct or c u rrent * i pk vin=5 v ,vout =3 .3 v 1.10 1 . 2 5 1 . 5 0 a m a xi mu m o u t p u t c u rrent * i o vin=5 v 5% , v o u t = 3.3v , l= 4 . 7 h - - 8 0 0 m a fo sc 1 f b =0.8v 0 . 8 1 . 0 1 . 2 mhz oscillato r freq u e n c y fo sc 2 f b =0v - - 2 0 0 -- khz r ds(on) o f p - ch a n n e l mosfe t r pfet i sw =600m a -- 0 . 4 0 . 5 ? r ds(on) o f n - ch a n n e l mosfe t r nfet i sw =- 600m a -- 0 . 3 5 0 . 4 5 ? sw l eak a g e c u rrent i ls w r u n = 0v ,s w=0v or 5v ,v in =5v -- 0.1 1 a r u n t h res h ol d v run 0 . 3 1 . 0 1 . 5 v r un lea k ag e c u rre n t i run -- 0.1 1 a l t v v i i i i on out in o o pk ? + = ? + = 2 ) ( 2 * 2f , no.1 0, pr os per it y r d . ii , sc ie nc e- bas e d in dus tr i a l par k , hs inc hu 3 00,t a i w an , r.o . c. t e l: 886- 3- 56 3- 087 8 w w w : h ttp :// w w w . ai m t ro n . co m . t w f a x : 886- 3- 5 63- 0 879 e m a i l : s e r v i ce@ ai m t ron . co m . t w 0 5 / 0 4 / 2 1 4
a t 1366 pr eliminar y produ ct inf o rmat i on 1mhz,800m a s y nchr onous buck controll er t y pic a l a ppl ic at ion c i r c uit l 1 : a bc s h 40284r 7y s b f i gur e 1 l 1 : a bc s h 40284r 7y s b f i gur e 2 2f , no.1 0, pr os per it y r d . ii , sc ie nc e- bas e d in dus tr i a l par k , hs inc hu 3 00,t a i w an , r.o . c. t e l: 886- 3- 56 3- 087 8 w w w : h ttp :// w w w . ai m t ro n . co m . t w f a x : 886- 3- 5 63- 0 879 e m a i l : s e r v i ce@ ai m t ron . co m . t w 0 5 / 0 4 / 2 1 5
a t 1366 pr eliminar y produ ct inf o rmat i on 1mhz,800m a s y nchr onous buck controll er t y p i cal ch aracteri sti c s : (r ef e r to f i gu r e 2 ) 2f , no.1 0, pr os per it y r d . ii , sc ie nc e- bas e d in dus tr i a l par k , hs inc hu 3 00,t a i w an , r.o . c. t e l: 886- 3- 56 3- 087 8 w w w : h ttp :// w w w . ai m t ro n . co m . t w f a x : 886- 3- 5 63- 0 879 e m a i l : s e r v i ce@ ai m t ron . co m . t w 0 5 / 0 4 / 2 1 6
a t 1366 pr eliminar y produ ct inf o rmat i on 1mhz,800m a s y nchr onous buck controll er t y p i cal ch aracteri sti c s : st a r t - u p f r o m s h u t d o wn ( v in =3 . 6 v ) ch1 : ru n ch2 : v out c h 4 : i l 2f , no.1 0, pr os per it y r d . ii , sc ie nc e- bas e d in dus tr i a l par k , hs inc hu 3 00,t a i w an , r.o . c. t e l: 886- 3- 56 3- 087 8 w w w : h ttp :// w w w . ai m t ro n . co m . t w f a x : 886- 3- 5 63- 0 879 e m a i l : s e r v i ce@ ai m t ron . co m . t w 0 5 / 0 4 / 2 1 7
a t 1366 pr eliminar y produ ct inf o rmat i on 1mhz,800m a s y nchr onous buck controll er t y p i cal ch aracteri sti c s ( c on ti n u t ed ) v in =5v , v out =3.3v ch2 : v out ch4: i ou t i lo a d =0ma to 600ma i lo a d = 50ma to 600ma i lo a d = 100ma to 600ma i lo a d = 200ma to 600ma i lo a d = 50ma to 800ma i lo a d = 200ma to 800ma 2f , no.1 0, pr os per it y r d . ii , sc ie nc e- bas e d in dus tr i a l par k , hs inc hu 3 00,t a i w an , r.o . c. t e l: 886- 3- 56 3- 087 8 w w w : h ttp :// w w w . ai m t ro n . co m . t w f a x : 886- 3- 5 63- 0 879 e m a i l : s e r v i ce@ ai m t ron . co m . t w 0 5 / 0 4 / 2 1 8
a t 1366 pr eliminar y produ ct inf o rmat i on 1mhz,800m a s y nchr onous buck controll er applic at ion in for m at io n c a pac i t o r se lec t ion i n continuous mode, the source cur r ent of the to p mosf et is square w a ve of dut y c y c l e. the prima r y fun c tion of the input cap acitor is to provide a low impe d ance loop for the ed ges of pulsed current d r awn b y th e a t 1366. a load step at the output can induce rin g in g at the input v i n. this rin g in g c a n couple to the output and be mistaken as loop instabilit y . the o s cillation can be imp rove d b y add the c a pa citance of the input capa c itor . a t y pic a l value is 4.7~22 f c e ramic (x 5r or x7r), poscap or aluminum pol y m e r . the s e ca pa c ito r s will pr ovide g ood high f r e qu e n c y b y p a ssing and the i r low esr will reduce resistive losses for hig h e r ef f i cienc y . th e input capacitor rm s current v a ries with the input voltag e a nd the ou tput voltag e . th e equ a tion for the max imum rms current in the input capacitor is: ) 1 ( in o in o omax rms v v v v i i ? = the output capa c itor d e pends on the suitabl e ripple voltage. l o w rip p le voltage corresponds to lower ef f ective series resi stan ce ( e sr). the output ripple voltag e is de te r mine d b y : ) 8 1 ( out l out fc esr i v + ? ? ? the output capa c itor rms ripple current is g i ven b y : in out in out rms v f l v v v i ? = ) ( 3 2 1 w h en choosing the inp u t and output ceramic c a pacitors, choos e the x5 r o r x 7 r di el ect ri c form ul at i ons. these di el ect ri cs hav e t h e best t e m p erat ur e a nd vol t a ge c h a r a c t e r istic s of a ll the ce r a mic s f o r a g i ve n v a lue a nd size . 2f , no.1 0, pr os per it y r d . ii , sc ie nc e- bas e d in dus tr i a l par k , hs inc hu 3 00,t a i w an , r.o . c. t e l: 886- 3- 56 3- 087 8 w w w : h ttp :// w w w . ai m t ro n . co m . t w f a x : 886- 3- 5 63- 0 879 e m a i l : s e r v i ce@ ai m t ron . co m . t w 0 5 / 0 4 / 2 1 9
a t 1366 pr eliminar y produ ct inf o rmat i on 1mhz,800m a s y nchr onous buck controll er induc t o r se le c t ion the inductor is chos en based on the d e sire d ripple curr ent. l a r g e v a lu e inductors lower ripple curr ent and small value inductors result in h i g h er ripple cur r e n t. alwa y s consider the losses associated with the dcr and its ef fect on the tot a l converter ef fici enc y when sele cting an inductor . the indu ctor is selected to lim it the ripple current t o som e p r edet er m i ned val u e, t y pi cal l y 2 0 ~40% of t h e ful l l o ad c u rrent at t h e max i mum input voltag e . the formula of indu ctanc e value is as below: ) ( 4 . 0 ~ 2 . 0 max out l i i = ? ? ? ? ? ? ? ? ? ? ? = 1 adjustable output v o lt age the a t 1366 appe ars a 0. 8v ref e r e nce volta ge at fb pin. the output volta ge is set b y a resi st i v e di vi der whi c h i s acco rdi n g t o t h e fol l o wi ng fo rm ul a: ) 1 2 1 ( 8 . 0 r r v v out + = *r1=150k ? f o r sta b ilit y c onside r a tion. the dissipation the power loss is g i ven b y : in s f r o in n on ds o p on ds o loss v i t t i v d r i d r i p + + + ? + = ? ? ) ( ) 1 ( ) ( 2 ) ( 2 loss ja a max j p t t + = ) ( 2f , no.1 0, pr os per it y r d . ii , sc ie nc e- bas e d in dus tr i a l par k , hs inc hu 3 00,t a i w an , r.o . c. t e l: 886- 3- 56 3- 087 8 w w w : h ttp :// w w w . ai m t ro n . co m . t w f a x : 886- 3- 5 63- 0 879 e m a i l : s e r v i ce@ ai m t ron . co m . t w 0 5 / 0 4 / 2 1 1 0
a t 1366 pr eliminar y produ ct inf o rmat i on 1mhz,800m a s y nchr onous buck controll er induc t o r s sur fac e m o u n t i ndu ct anc e ( h) manufact u r er/ p art no. manufact u r er w e bsi t e 3 . 3 s u m i d a c d r h 4 d 2 8 - 3 r 3 4 . 7 s u m i d a c d r h 5 d 1 8 - 4 r 7 www .sum i d a.com 3 . 3 m i t s u m i c3-k1.8l - 3 r 3 mitsumi c4-k1.8l -3r3 w w w .mitsumi.c o .jp 3 . 3 a b c sh40283r3ysb 4 . 7 a b c sh40284r7ysb www .atec- group.com cap a ci tors s u r f a ce mo u n t c a paci t a nc e( f) manufact u r er/ p art no. manufact u r er w e bsi t e 2 2 t d k c3216x5r0j 226m www . t d k . c o m 4 7 t d k c3225x5r0j 46m www . t d k . c o m 1 0 g r m 4 2 - 6 x 5 r 1 0 6 k 6 . 3 www . m u r a t a . c o m 4 . 7 t a i yo j m k212b j 4 7 5 m g www .t- y ud e n . c o m 2f , no.1 0, pr os per it y r d . ii , sc ie nc e- bas e d in dus tr i a l par k , hs inc hu 3 00,t a i w an , r.o . c. t e l: 886- 3- 56 3- 087 8 w w w : h ttp :// w w w . ai m t ro n . co m . t w f a x : 886- 3- 5 63- 0 879 e m a i l : s e r v i ce@ ai m t ron . co m . t w 0 5 / 0 4 / 2 1 1 1
a t 1366 pr eliminar y produ ct inf o rmat i on 1mhz,800m a s y nchr onous buck controll er p c board layout 1. the most critical aspe ct of the la y out is the place ment of the input capa c itor c1. i t must be placed as close as possible to the a t 1366 to reduce th e input ripple volta g e . 2. power loops on the inpu t and output of th e conv erter should b e laid out with the shortest and widest tra c e s possible. the longer a nd narro wer the t r ac e, th e hi g h er resistance and inductan ce it w ill have. the leng th of t r aces in seri es with the capa c i t o rs i n cre a ses i t s es r and es l and re duces t h ei r e f fe ct i v enes s at hi g h frequen c y . 3. the f b pin should connect to feedback r e sistors directl y . and the route should be awa y f r om the noise sour ce, such as inductor of s w line. 4. grounding all componen t s at the same poi nt ma y ef f ectivel y redu ce the oc curren c e of loop. 2f , no.1 0, pr os per it y r d . ii , sc ie nc e- bas e d in dus tr i a l par k , hs inc hu 3 00,t a i w an , r.o . c. t e l: 886- 3- 56 3- 087 8 w w w : h ttp :// w w w . ai m t ro n . co m . t w f a x : 886- 3- 5 63- 0 879 e m a i l : s e r v i ce@ ai m t ron . co m . t w 0 5 / 0 4 / 2 1 1 2
a t 1366 pr eliminar y produ ct inf o rmat i on 1mhz,800m a s y nchr onous buck controll er p a c k age out line : s ot - 2 5 inc h es m i l l imet er s symb ol m i n m a x m i n m a x not es a 0 . 0 3 5 0 . 0 5 7 0 . 9 0 1 . 4 5 - a 1 0 . 0 0 0 0 . 0 0 6 0 . 0 0 0 . 1 5 - a 2 0 . 0 3 5 0 . 0 5 1 0 . 9 0 1 . 3 0 - b 0 . 0 1 0 0 . 0 2 0 0 . 2 5 0 . 5 0 - c 0 . 0 0 3 0 . 0 0 8 0 . 0 8 0 . 2 0 - d 0 . 1 1 0 0 . 1 2 2 2 . 8 0 3 . 1 0 - e 0 . 1 0 2 0.1 1 8 2 . 6 0 3 . 0 0 - e 1 0 . 0 5 9 0 . 0 6 9 1 . 5 0 1 . 7 5 - l 0 . 0 1 4 0 . 0 2 2 0 . 3 5 0 . 5 5 e 0 . 0 3 7 ref 0.95ref e 1 0 . 0 7 5 ref 1.90ref r 0 0 10 0 0 0 10 0 - 2f , no.1 0, pr os per it y r d . ii , sc ie nc e- bas e d in dus tr i a l par k , hs inc hu 3 00,t a i w an , r.o . c. t e l: 886- 3- 56 3- 087 8 w w w : h ttp :// w w w . ai m t ro n . co m . t w f a x : 886- 3- 5 63- 0 879 e m a i l : s e r v i ce@ ai m t ron . co m . t w 0 5 / 0 4 / 2 1 1 3

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