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a t 1 3 6 6 b pr eliminary product information 1mhz,800ma sy nch r onous bu ck conver ter 7f , no.9, p a rk a venue ii, sc ienc e-b a s e d indu s t rial park , hs inc hu 300,t a iw an, r.o.c. t e l: 886-3 - 56 3-0 878 fax: 886-3 - 5 63-087 9 www : h ttp ://www .ai m tro n . co m . t w 1 / 1 8 / 2 0 0 6 r e v : 1 . 2 e m a i l : service@aim t ron.c o m . tw featur es ? high e f ficiency (9 5% ) pos si bl e ? no sc hot t k y di o d e r e qui re d ? 8 0 0 m a ou tpu t cur r e n t at 5v inpu t 3.3v ou tpu t ? oscillatio n freq u e n c y 1 . 0 m hz ? bu ilt-in on/ o ff fu n c tion ? bu ilt-in sh ort circu it pro t ect io n ? lo w dr op o u t o p erat i o n: 10 0% d u t y c y cle ? s t and-by current m a x. 1 a ? inpu t vo ltag e : 2 . 5 v ~5.5v applications ? po wer s u p p l y fo r po rtable devices general descr i ption the at 13 6 6 b p r o vi des co m p l e t e cont r o l fo r a dc/dc conv erter op timized for h i g h - p erformance microprocess o r applications . it is ope r a t ed on current m ode architecture for excellent line and l o ad t r a n si ent r e sp onse . 1m h z ope rat i o n f r e que ncy is allowi ng the use of sm all surface m o unt i n ductor and capacitor. the i n tern al sy nc hr on o u s swi t c h increases e fficiency and el im inates the nee d for an external schot t ky diode. th e a t 1 366 is a f a m i l y of l o w - noi se sy nch r on o u s st ep- d ow n dc / d c co nv erters t h at is id eally su ited fo r syste m s po we red fr om a 1 - cel l li -i on bat t e ry or fr om a 3 - cell to 4-cell nicd, nimh, or alk a lin e b a ttery. it can al s o be use d t o u s b - b a se d po we r sy st e m . block dia g ram aimtr o n r e s erves the right without notice to change this cir c ui try and specifications. 1
a t 1 3 6 6 b pr eliminary product information 1mhz,800ma sy nch r onous bu ck conver ter 7f , no.9, p a rk a venue ii, sc ienc e-b a s e d indu s t rial park , hs inc hu 300,t a iw an, r.o.c. t e l: 886-3 - 56 3-0 878 fax: 886-3 - 5 63-087 9 www : h ttp ://www .ai m tro n . co m . t w 1 / 1 8 / 2 0 0 6 r e v : 1 . 2 e m a i l : service@aim t ron.c o m . tw pin configuration ordering i n formation p a rt number package mar k ing a t 1 366 b x s o t - 25 : d a te c o de a t 1 366 b x _ g r e s o t - 25,gr e e n : d a te c o de w i th one bo tt om line * for mor e mark ing information , contact our sale s r e pr esentative dir ectly pin description sy m b o l p i n no. de sc r i p t ru n 1 o n / off co ntr o l gnd 2 p o w e r gr oun d sw 3 swi t c h n ode c o n n ect i o n t o i n duct o r vi n 4 p o wer s u p p l y fb 5 o u t put feed ba c k 2
a t 1 3 6 6 b pr eliminary product information 1mhz,800ma sy nch r onous bu ck conver ter 7f , no.9, p a rk a venue ii, sc ienc e-b a s e d indu s t rial park , hs inc hu 300,t a iw an, r.o.c. t e l: 886-3 - 56 3-0 878 fax: 886-3 - 5 63-087 9 www : h ttp ://www .ai m tro n . co m . t w 1 / 1 8 / 2 0 0 6 r e v : 1 . 2 e m a i l : service@aim t ron.c o m . tw absolute m aximum ra tings ra ted v a lue par a meter conditi on m i n . m a x . unit power su pp ly v o ltag e ? -0.3 +6 .0 v run , f b - 0 . 3 vi n v i npu t pin v o ltag e s w - 0 . 3 vi n+ 0. 3 v p-c h a n nel s w i t c h s o u r ce c u rre nt (dc ) ? - 1 000 m a n-c h an nel s w i t c h si nk c u r r ent (dc ) ? - 1 000 m a peak sw sink and source c u rre nt ? - 1.5 a therm a l resistance from junction to am b i en t ja so t - 2 5 - 20 0 0 c/w ope r ating temperat ure t a ? - 3 5 + 8 5 0 c s t ora g e tem p erature ? -55 +150 0 c hbm 2 k v esd su scep tibilit y * 2 m m 2 0 0 v 1. str e sse s beyond those listed unde r ?absolute m a xi mu m ratin g s ? may c a u s e p erman en t d a mage to th e d e vice . th es e are s t res s rati n g s on ly , and functional operation of th e d e vice at these or an y other c o nditions be y o nd those indic a te d in th e op erat i on al s e ction s of th e s p ecif i catio n s is n o t imp l i e d . exp o s u re to absolute max i mum rating co nditions for ext e nded periods may affec t devi ce rel iabilit y . 2. dev i ce ar e esd sensitive. handling pr ecaution r ecomm ended. the hu man body mo del is a 100pf cap a citor d i s c h a rged th r o u g h a 1.5k ? r e sistor into e a c h pin. recommen d ed operating conditions (t a=+25 0 c) va l u e s par a meter sym b ol m i n . t y p . ma x . unit power supp ly v o ltag e v in 2. 5 - - 5. 5 ? op erating temp erat u r e* t a -2 0 + 2 5 + 8 5 c ope r at i n g ju nc t i on t e m p erat ur e t j - - +15 0 c *using x 5 r or x 7 r input capacitors. 3
a t 1 3 6 6 b pr eliminary product information 1mhz,800ma sy nch r onous bu ck conver ter 7f , no.9, p a rk a venue ii, sc ienc e-b a s e d indu s t rial park , hs inc hu 300,t a iw an, r.o.c. t e l: 886-3 - 56 3-0 878 fax: 886-3 - 5 63-087 9 www : h ttp ://www .ai m tro n . co m . t w 1 / 1 8 / 2 0 0 6 r e v : 1 . 2 e m a i l : service@aim t ron.c o m . tw electrical c h aracteristics (vin = 3.6v,t a =+25
, unless otherw i se noted. ) va l u e s par a meter sym b ol conditi on min. t y p . m a x . unit i npu t su pp ly ran g e v in 2. 5 - - 5. 5 v qu iescen t curren t * i s fb=0. 6 v , i lo ad =0a activ e m o d e - - 3 0 0 - - a c u r r ent i n st an dby m ode i st r un= 0v , v i n = 5. 5v - - 0 . 5 1 a feedback voltage v fb t a =-20
to + 8 5
0. 58 8 0 . 6 0 0 0 . 61 2 v feedback voltage lin e-reg u l ation v fb-line vc c = 2. 5 v t o 5. 5v - - 0. 1 0 . 5 % feedback va ri ation with tem p erature t a =-20
to + 8 5
- - 0. 5 1 . 0 % feedback curre nt i fb - - - - 200 na peak inductor cu rren t * i pk vi n= 5v , v o u t =3. 3 v 1. 10 1. 2 5 1 . 5 0 a m a xi m u m out put cu rren t * i o vi n= 5v 5 % , vo ut= 3 . 3 v , l=4.7 h - - 80 0 m a fosc 1 fb =0. 6 v 0 . 8 1. 0 1. 2 mh z oscillato r frequ e n c y fosc 2 fb=0 v - - 2 0 0 - - khz r ds( o n) o f p-cha n nel mosfe t r pfet i sw =600 m a - - 0 . 4 0. 5 ? r ds( o n) o f n-c h an nel mosfe t r nfet i sw =- 60 0m a - - 0 . 3 5 0. 4 5 ? sw leaka g e c u rrent i ls w ru n = 0v ,sw=0 v or 5v ,v in =5v -- 0.1 1 a r u n th res hol d v run 0. 3 1 . 0 1. 5 v run leaka g e current i run -- 0.1 1 a l t v v i i i i on out in o o pk ? + = ? + = 2 ) ( 2 * 4
a t 1 3 6 6 b pr eliminary product information 1mhz,800ma sy nch r onous bu ck conver ter 7f , no.9, p a rk a venue ii, sc ienc e-b a s e d indu s t rial park , hs inc hu 300,t a iw an, r.o.c. t e l: 886-3 - 56 3-0 878 fax: 886-3 - 5 63-087 9 www : h ttp ://w ww .ai m tro n . co m . t w 1 / 1 8 / 2 0 0 6 r e v : 1 . 2 e m a i l : service@aim t ron.c o m . tw t y pical characteristics : (r efer to figur e 2) 5
a t 1 3 6 6 b pr eliminary product information 1mhz,800ma sy nch r onous bu ck conver ter 7f , no.9, p a rk a venue ii, sc ienc e-b a s e d indu s t rial park , hs inc hu 300,t a iw an, r.o.c. t e l: 886-3 - 56 3-0 878 fax: 886-3 - 5 63-087 9 www : h ttp ://w ww .ai m tro n . co m . t w 1 / 1 8 / 2 0 0 6 r e v : 1 . 2 e m a i l : service@aim t ron.c o m . tw t y pical characteristics : s t art - u p fr om sh ut d o w n (v in =3.6v) ch1: ru n c h 2: v out c h 4 : i l 6
a t 1 3 6 6 b pr eliminary product information 1mhz,800ma sy nch r onous bu ck conver ter 7f , no.9, p a rk a venue ii, sc ienc e-b a s e d indu s t rial park , hs inc hu 300,t a iw an, r.o.c. t e l: 886-3 - 56 3-0 878 fax: 886-3 - 5 63-087 9 www : h ttp ://w ww .ai m tro n . co m . t w 1 / 1 8 / 2 0 0 6 r e v : 1 . 2 e m a i l : service@aim t ron.c o m . tw t y pical characteristics (continuted) v in =5v , v ou t =3.3v ch2:v out c h 4 : i out i load =0ma to 600ma i load = 50ma to 600m a i load = 100ma to 600ma i load = 200ma to 600ma i load = 50ma to 800m a i load = 200ma to 800ma 7
a t 1 3 6 6 b pr eliminary product information 1mhz,800ma sy nch r onous bu ck conver ter 7f , no.9, p a rk a venue ii, sc ienc e-b a s e d indu s t rial park , hs inc hu 300,t a iw an, r.o.c. t e l: 886-3 - 56 3-0 878 fax: 886-3 - 5 63-087 9 www : h ttp ://w ww .ai m tro n . co m . t w 1 / 1 8 / 2 0 0 6 r e v : 1 . 2 e m a i l : service@aim t ron.c o m . tw t y pical application cir c uit l1 :a bc sh402 84 r7 ysb figur e 1 l1 :a bc sh402 84 r7 ysb figur e 2 8
a t 1 3 6 6 b pr eliminary product information 1mhz,800ma sy nch r onous bu ck conver ter 7f , no.9, p a rk a venue ii, sc ienc e-b a s e d indu s t rial park , hs inc hu 300,t a iw an, r.o.c. t e l: 886-3 - 56 3-0 878 fax: 886-3 - 5 63-087 9 www : h ttp ://w ww .ai m tro n . co m . t w 1 / 1 8 / 2 0 0 6 r e v : 1 . 2 e m a i l : service@aim t ron.c o m . tw application informat io n short cir c uit pr otection function the a t 1366b has short circuit protection(see the electrical charact eristics frequency item ) . w h en the output is shorted to ground, th e frequency of the oscillator is reduced to about 200khz. this frequency foldback ensures that the inductor current has m o r e tim e to decay . it will p r event the inducto r cu rrent and in ternal p-mos f et current runaway to dam a ge the device. the f r equenc y will r e turn to the norm a l values when the short circuit cond itio n is rem oved and the feedback volta ge reache s 0 . 6v . capacitor selection in continuous m ode, the source current of the top mosfet is square wave of duty cycle. the prim ary function of the in put cap ac ito r is to p r ovide a low impedance loo p for the edges of pulsed current drawn by th e a t 1366b. a load step at the output can induce ringing at the input vin. this ringi ng can couple to the output and be m i stake n as loop instability . the oscillation can be im proved by add the capacitance of the input capacitor . a typical value is 4.7~22 f ceram ic ( x 5r or x7r), poscap or alu m inu m polym e r . these capacitors will provide good high frequency bypassing and their low esr will r e duce resistive losses f o r high er e f f i ciency . the inpu t ca pacito r rms current varies with the input voltage a nd the output voltage. the equation for the m a xi mum rms current in the input capacitor is: ) 1 ( in o in o omax rms v v v v i i ? = the output capacitor depends on the suit able ripple voltage. low ripple voltage corresponds to lower ef fective series resist ance (esr). the output ripple voltage is determ ined by: ) 8 1 ( out l out fc esr i v + ? ? ? the output capacitor rms ri pple current is given by: 9
a t 1 3 6 6 b pr eliminary product information 1mhz,800ma sy nch r onous bu ck conver ter 7f , no.9, p a rk a venue ii, sc ienc e-b a s e d indu s t rial park , hs inc hu 300,t a iw an, r.o.c. t e l: 886-3 - 56 3-0 878 fax: 886-3 - 5 63-087 9 www : h ttp ://w ww .ai m tro n . co m . t w 1 / 1 8 / 2 0 0 6 r e v : 1 . 2 e m a i l : service@aim t ron.c o m . tw in out in out rms v f l v v v i ? = ) ( 3 2 1 when choosing the input and output ceram ic capacitors, choose the x5r or x7 r dielectric form ulations. these dielectrics have the best tem p erature and voltage characteristics of all the ceram ics for a given value and size. inductor selection the inductor is chosen based on the desire d ripple current. lar g e value inductors lower ripple current and s m all value inducto rs result in higher ripple current. always consider the losses associated with the dcr and its ef fect on the total converter ef ficiency when selecting an indu ctor . th e in ductor is se lected to lim it the ripp le curren t to so m e predeterm i ned value, typica lly 2 0 ~40% of the f u ll load c u rrent at th e m a xi mum input voltage. the for m ula of inductance value is as below: ) ( 4 . 0 ~ 2 . 0 max out l i i = ? ? ? ? ? ? ? ? ? ? ? = in out l out v v i f v l 1 adjustable output v o ltage the a t 1366b appears a 0.6v reference voltage at fb pin. the output voltage is set by a resistiv e divider which is acco rding to the follow i ng form ula: ) 1 2 1 ( 6 . 0 r r v v out + = *r1=150k ? for stability consideration. 1 0
a t 1 3 6 6 b pr eliminary product information 1mhz,800ma sy nch r onous bu ck conver ter 7f , no.9, p a rk a venue ii, sc ienc e-b a s e d indu s t rial park , hs inc hu 300,t a iw an, r.o.c. t e l: 886-3 - 56 3-0 878 fax: 886-3 - 5 63-087 9 www : h ttp ://w ww .ai m tro n . co m . t w 1 / 1 8 / 2 0 0 6 r e v : 1 . 2 e m a i l : service@aim t ron.c o m . tw the dissipation the power loss is given by: in s f r o in n on ds o p on ds o loss v i f t t i v d r i d r i p + + + ? + = ? ? s ) ( 2 ) ( 2 ) ( ) 1 ( loss ja a max j p t t + = ) ( inductors surface mount inductance( h) manufacturer/part no. manufacturer w e bsite 3 . 3 s u m i da c d r h 4 d 2 8 - 3 r 3 4 . 7 s u m i da c d r h 5 d 1 8 - 4 r 7 www .sum ida.com 3 . 3 m i t s u m i c 3 - k 1 . 8 l - 3 r 3 mitsum i c4-k1.8l-3r3 www .m itsum i.co.jp 3 . 3 a b c s h 4 0 2 8 3 r 3 y s b 4 . 7 a b c s h 4 0 2 8 4 r 7 y s b www .atec-group.com capacitors surface mount capacitanc e ( f) manufacturer/part no. manufacturer w e bsite 2 2 t d k c 3 2 1 6 x 5 r 0 j 2 2 6 m www . t d k . c o m 4 7 t d k c 3 2 2 5 x 5 r 0 j 4 6 m 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 .murata.com 4 . 7 t a iyo jm k 2 1 2 b j 4 7 5 m g www .t-yuden.com 1 1
a t 1 3 6 6 b pr eliminary product information 1mhz,800ma sy nch r onous bu ck conver ter 7f , no.9, p a rk a venue ii, sc ienc e-b a s e d indu s t rial park , hs inc hu 300,t a iw an, r.o.c. t e l: 886-3 - 56 3-0 878 fax: 886-3 - 5 63-087 9 www : h ttp ://w ww .ai m tro n . co m . t w 1 / 1 8 / 2 0 0 6 r e v : 1 . 2 e m a i l : service@aim t ron.c o m . tw pc board layout 1. the m o st critical asp ect of the layou t is th e placem ent of the input capacitor c1. it must be placed as close as possible to the a t 1366b to reduce the in put ripple voltage. 2. power loops on the input and output of the converter should be laid out with the shortest and widest traces possible. the longer and na rrower the trace, the higher resis t ance and inductan ce it will h a ve. the length of traces in series with the capacitors increases its esr and esl and reduces th eir ef fectiveness at high frequency . 3. the fb pin should connect to feedback re sistors directly . and the route should be away from the noise source, such as inductor of sw line. 4. grounding all com ponents at the same point m a y ef fectively reduce the occurrence of loop. 1 2
a t 1 3 6 6 b pr eliminary product information 1mhz,800ma sy nch r onous bu ck conver ter 7f , no.9, p a rk a venue ii, sc ienc e-b a s e d indu s t rial park , hs inc hu 300,t a iw an, r.o.c. t e l: 886-3 - 56 3-0 878 fax: 886-3 - 5 63-087 9 www : h ttp ://w ww .ai m tro n . co m . t w 1 / 1 8 / 2 0 0 6 r e v : 1 . 2 e m a i l : service@aim t ron.c o m . tw package outline :s ot -25 inc h e s m i l l i m e t e r s symbol m i n m a x m i n m a x notes a 0 . 03 5 0. 05 7 0. 9 0 1. 4 5 - a 1 0 . 00 0 0. 00 6 0. 0 0 0. 1 5 - a 2 0 . 03 5 0. 05 1 0. 9 0 1. 3 0 - b 0 . 01 0 0. 02 0 0. 2 5 0. 5 0 - c 0 . 00 3 0. 00 8 0. 0 8 0. 2 0 - d 0 . 1 1 0 0. 12 2 2. 8 0 3. 1 0 - e 0 . 10 2 0. 1 1 8 2. 6 0 3. 0 0 - e 1 0 . 05 9 0. 06 9 1. 5 0 1. 7 5 - l 0 . 01 4 0. 02 2 0. 3 5 0. 5 5 e 0 . 03 7 r e f 0. 95 r e f e 1 0 . 07 5 r e f 1. 90 r e f r 0 0 10 0 0 0 10 0 - 1 3
a t 1 3 6 6 b pr eliminary product information 1mhz,800ma sy nch r onous bu ck conver ter 7f , no.9, p a rk a venue ii, sc ienc e-b a s e d indu s t rial park , hs inc hu 300,t a iw an, r.o.c. t e l: 886-3 - 56 3-0 878 fax: 886-3 - 5 63-087 9 www : h ttp ://w ww .ai m tro n . co m . t w 1 / 1 8 / 2 0 0 6 r e v : 1 . 2 e m a i l : service@aim t ron.c o m . tw reflow pr ofile s sn-pb eutec t ic as sembly pb-fre e as s e mbly profile featu r e large bod y pkg. thickne ss 2.5mm or pkg. vo l u m e 3 50mm 3 small bod y pkg. thickne ss <2.5mm or pkg. v o lume < 350mm 3 large bod y pkg. thickne ss 2.5mm or pkg. vo l u m e 3 50mm 3 small bod y pkg. thickne s s 2.5mm or pkg. vo l u m e 3 50mm 3 a v erage ram p -u p rate (t l to t p ) 3 c/ se con d max . 3 c/ se con d max . prehe at -t empe rature min(t s min) -t empe ratur e max (t sma x ) -t ime (mi n to max )(t s) 100 c 150 c 60-120 se con d s 150 c 200 c 60-180 se con d s ts m a x t o t l -ram p-up rate 3 c/ se con d max . t i me maint a i ned ab ove: -t empe ratur e (t l ) -t ime (t l ) 183 c 60-150 se con d s 217 c 60-150 se con d s peak t e mp erature ( t p ) 225 +0/-5 c 2 4 0 +0/-5 c 2 4 5 +0/-5 c 2 5 0 +0/-5 c ti m e w i t h i n 5 c of a c tual pea k t e mperature (t p ) 10-30 second s 10-30 second s 10- 30 second s 20-40 second s ram p -d own rate 6 c/ se con d max . 3 c/ se con d max . ti m e 2 5 c to peak t e mperature 6 minute s ma x. 8 minute s ma x. * a ll temp er atu r es r e fer to to p s id e o f th e p ack ag e, mea s u red o n th e p ack ag e b o d y su rfac e. 1 4

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