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a t 1 3 0 9 pr eliminary product information m i c r o - p o w e r s t e p u p d c - d c c o n v e r t e r featur e ? o pe rat i n g v o l t age: 2. 5v t o 6. 0v . ? h i g h o p e r at i n g f r e que ncy : 1 . 4m hz ?hig h ou tpu t v o ltag e : up to 2 8 v ? s hut do w n c u rre nt <1 a ?dig ital dimmin g c o n t ro l. ?bu ilt-in cycle-b y cycle curren t-lim i tin g . ?bu ilt-in soft-s tart fu n c tion . ? 1. 5% 1. 2 3 v r e fere nce v o l t a ge ?t iny sot - 25 packa g e a p p l i c a t i o n ? stn/ ole d bias ? perso n a l dig i tal assistan ts(pdas) ? d s c description the a t 1 3 0 9 s t ep- up c o nve rt er i s desi g n e d fo r sm al l or m e di u m si ze lc d pa nel o f hi g h bi as vol t a ge wi t h a constant c u rrent to provide pdas, and othe r han d - hel d de vi ces. it feat ures a fast 1. 4 m h z cu rren t - m o d e pw m con t ro l with a bu ilt-in 0 . 3 n-m o s t h at allows for sm aller capacitor a n d inductor . fa ul t condition protection uses cycle-by -cy c l e cur r ent l i m i t i ng t o s e nse m a xim u m i nduct o r cur r ent a n d t h erm a l prot e c t i on. al so i n cl ude d soft -start elim inates in ru sh cu rre nt d u r in g sta r t-u p . the a t 1309 is available in 5 - pi n so t - 2 5 pa ckage s . block diagram aimtr o n r e s erves the right without notice to change this cir c ui try and specifications. 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 3/2/2006 rev : 1.1 e m a i l : service@ai mtron.c o m . tw 1
a t 1 3 0 9 pr eliminary product information m i c r o - p o w e r s t e p u p d c - d c c o n v e r t e r pin configuration ordering i n formation part number package mar k ing a t 1 309x s o t - 25 da te c o de a t 1 309x _ g r e s o t - 25 , gr e e n ,d ate c o de w i th one b o t t om l i n e : da te co de * for mor e mark ing information , contact our sale s r e pr esentative dir ectly pin description pin n0. sym b ol i / o descripti o n 1 lx i s t ep-up regul a tor n-m o s drain. place out put diode a n d i n ductor . 2 gn d p g r ou nd 3 f b i s t ep-up regul a tor feedbac k input. c onnect a se nse resistor from fb to g r ou nd . 4 e n i ena b l e an d di m m i ng c ont r o l i n p u t . l e d b r i ght ne ss a n d i c sh ut d o w n a r e co n t ro lled b y t h e v o ltag e on en. driv ing l o w for long er than 4 m s to shutdow n t h e i c . 5 v i n p pow e r supp ly . 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 3/2/2006 rev : 1.1 e m a i l : service@ai mtron.c o m . tw 2
a t 1 3 0 9 pr eliminary product information m i c r o - p o w e r s t e p u p d c - d c c o n v e r t e r absolute m aximum ra tings * 1 par a m e t e r r a t e d v a l u e u n i t vin vo ltag e -0.3 to +6 .5 v lx vo ltag e -0.3 to +30 v en , fb t o gn d -0.3 to + 6 . 5 v switch c u rren t (i lx ) 1 . 8 a c ont i n u ous p o w er di ssi pat i o n (s ot - 2 5 t a =+25 o c ) 0 . 2 5 w ope r at i n g j unc t i on t e m p erat u r e r a n g e -3 0 t o 85
lead t e m p erat ure (s ol de ri n g 5 sec ) 26 0
s t ora g e t e m p erat ure -6 5 t o 12 5
packa g e t h ermal resistance ( ja ) 25 0
/w hbm 2 kv 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 mum ratings? may cause permanen t damage 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 operation conditions va l u e s par a m e t e r s y m b o l m i n . t y p . m a x . unit power supp ly v o ltag e v in 2. 5 7 6. 0 v ope r ating temperat ure t op -2 0 + 2 5 + 8 5
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 3/2/2006 rev : 1.1 e m a i l : service@ai mtron.c o m . tw 3
a t 1 3 0 9 pr eliminary product information m i c r o - p o w e r s t e p u p d c - d c c o n v e r t e r electrical c h aracteristics (v in =2.5v , t a =+2 5
, unless other w ise noted) par a m e t e r s y m b ol t e st c o nditi o n min. t y p . ma x. units op erating v in r a nge v in v in i nput v o l t a ge 2. 5 - 6 . 0 v un de r v o l t a ge ther sh ol d uv lo v in fal l i ng, 10 0m v hy st eresi s 2. 1 2 . 2 2. 3 v switch- of f inp u t c u rren t i in1 no s w i t c hi n g - 10 0 12 0 a sh ut d o w n c u r r e nt i in3 en= 0 v - - 1 a feedback refe rence v fb 1 . 21 2 1 . 2 3 0 1. 24 8 v fb in pu t bias cu rren t i fb v fb =0.2 v - - 1 a out put v o l t a ge li ne r e gul at i on 2. 5v< v in <6.0v - 0 . 1 - % swi t c hi n g fre q uency f osc - 1. 4 - m h z m a x i mu m d u t y d max - 9 0 - % so ft-s tart c h ar gin g tim e t ss - 0. 5 - m s switch i ng c u rren t lim i t i lx v in =3.0v , d u t y cy cl e=80% - 1. 0 - a lx on resistance r lx i lx =350 m a - 0 . 3 - ? lx lea k a g e c u rrent i leakage v lx =28v , e n =0v - - 1 a en inpu t curren t i en en= 5 v - - 8 a v ih 0. 1v hy st ere s i s 2. 0 - - v en input le ve l v il - - 0. 8 v en l o w s hut d o w n del a y - 4 - m s therm a l shut d o w n - 1 2 0 -
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 3/2/2006 rev : 1.1 e m a i l : service@ai mtron.c o m . tw 4
a t 1 3 0 9 pr eliminary product information m i c r o - p o w e r s t e p u p d c - d c c o n v e r t e r t y pical characteristics e f f i ci e n cy vs . l o a d cu r r e n t loa d c u r r e n t e ffi c i e n c y (% ) 7* / 7 7* / 7 7* / 7 e f f i ci e n cy vs . l o a d cu r r e n t loa d c u r r e nt e f f i ci en cy ( % ) - v ) - v ) e f f i ci e n c y vs . v i n vi n ( v) effi c i e n c y (% ) *0 6 5 n " *0 6 5 n " * 0 6 5 n " v o =15v l=10uh v o =15v l=10uh q u i e s c en t c u r r en t v s . v i n vi n ( v ) q u i escen t cu rren t ( u a) v o =15v v i n=3.0v ta = 2 5 o c 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 3/2/2006 rev : 1.1 e m a i l : service@ai mtron.c o m . tw 5
a t 1 3 0 9 pr eliminary product information m i c r o - p o w e r s t e p u p d c - d c c o n v e r t e r load t r a n si ent respo n s e vin=3.0v , v o ut=15 v , l=1 0 u h, iout=1 0m a to 100ma ch1:v o ut (ac mode), ch4:iout, t i me:0.2 ms/div line t r ansie n t re spon se vin=3.0v to 6.0v , v out=1 5v , l=1 0 u h , iout=1 00ma ch1:vin, ch 2:v out (ac m ode ), ch3:i in , t i me:0.5s / div 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 3/2/2006 rev : 1.1 e m a i l : service@ai mtron.c o m . tw 6
a t 1 3 0 9 pr eliminary product information m i c r o - p o w e r s t e p u p d c - d c c o n v e r t e r s t art up w a v e form w i th l o ad vin=3.0v , v o ut=15 v , l=1 0 u h, iout=1 00 ma ch1:v o ut, ch 2:en, ch3:i in , t i me:5ms/di v lx s w i t c h ing w a v e form vin=3.0v , v o ut=15 v , l=1 0 uh ch1:lx, ch3:i lx , t i m e : 0.5us/div 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 3/2/2006 rev : 1.1 e m a i l : service@ai mtron.c o m . tw 7
a t 1 3 0 9 pr eliminary product information m i c r o - p o w e r s t e p u p d c - d c c o n v e r t e r application cir c uit lx gnd fb 20pf vin m b r 0530 4.7 u h 4u 7f vi n 2 . 5 v t o 5. 0v AT1309 en 18 0k 16 k 1u f 15 v/ 4 m a m b r 053 0 m b r 053 0 m b r 0 530 1uf -1 5v /4 ma 1u f 1uf fig3. 1 5 v dual outpu t conv erter lx gnd fb vin ss 24 10u h 10 uf vi n 3. 0 v t o 5. 0 v AT1309 en 1 80k 16 k 1 0uf 15 v / 100 m a 20 pf fig4. 15v bo ost conv erter 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 3/2/2006 rev : 1.1 e m a i l : service@ai mtron.c o m . tw 8
a t 1 3 0 9 pr eliminary product information m i c r o - p o w e r s t e p u p d c - d c c o n v e r t e r function description the a t 1309 is designed prim arily for use in stn/oled bias applications. the output voltage of the step-up converter can be set from v i n to 26v with external resistive voltage divider . the boost converter opera tes in current-m ode pw m and a constant frequency of 1.0 mhz. depending on duty cycl e of each switching cycle can regu late output voltage. on the rising edge of the in ternal clock, the control and driver logic block sets internal flip-flop when t h e output voltage is too low , which turns on the n-mos. the exte rnal in ductor cu rre nt ram p s up linearly , storing ener gy in a m a gnetic filed. once peak current of inductor over trans-conductance output level, the n-mos turns of f , the f lip-f lop r e sets, and e x terna l schottky diode turns on . this forces the current through the inductor to ram p back down, transferring the ener gy stored in the m a gnetic field to the output capacitor and load. t o reduce external com ponent am ount , the device will be bu ilt-in intern al lo op com p ensation. enable contr o l digital logic of en pr ovides an electri cal on/off cont rol of the power supply . connecting this pin to g r ound or to any volta ge less th an 0. 7v will completely tu rn off the regulator . in this state, current drain from the input s upply is less than 1 a, the internal reference, error am plifier , co m p arators, and biasing circuitry turn of f . en works as a sim p le on/of f control. drive en high to enable the device, or drive e n low for shutdown. soft-s tart sof t -star t allows a gradu a l inc r ease of the intern al cur r ent-lim it level f o r the s t ep-u p converter during power -up to reduce input su r g e currents. as the internal current source char g e s the intern al soft-start capacitor , th e peak n-mos current is lim ited by the voltage on the capacitor . cycle-by-c ycle over -c urr e nt pr otection the a t 1309 provides cycle-by-cycle over - current protection. current lim it is accom p lished using a separate dedicated com p arator . the cy cle-by -cycle curren t lim it abbrevia tes the on-tim e of the n-mos in ev ent that the cu rrent of flowi ng n-mos i s greater than the cu rren t lim it value. the cu rrent-lim it feature protection against a hard short or over -current fault at the output . thermal-overload pr otection therm a l-overload protection lim its total pow er dissipation in the a t 1309. when the junction temperature exceeds tj=130 , a th erm a l sensor activates the therm a l
protection, which shuts down the ic, allowing the ic to cool. once the device cools down by 10 , ic will autom a tically re cover norm a l operation. for continuou s
operation , do not exceed the absolute m a ximum junction-tem p erature rating of tj=120
. 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 3/2/2006 rev : 1.1 e m a i l : service@ai mtron.c o m . tw 9
a t 1 3 0 9 pr eliminary product information m i c r o - p o w e r s t e p u p d c - d c c o n v e r t e r po w e r dissipation consideration the a t 1309 m a xim u m power diss ipation depends on the therm a l resistance of the ic package and circuit board, the tem p eratu r e dif f erence between the die junction and am bient air , and the rate of any airflow . the power dissipation in the device depends on the operating conditions of the regulato r . in continuou s condition, the step-up converter power dissipated in ternally across the internal n-mos can be approxim a ted by : d r l f d v v v i p on ds osc in in o o boost + = ) ( 2 2 ] ) ( 12 1 ) [( where i o : it is th e load cur r ent. f osc : it is a switching frequency . 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 3/2/2006 rev : 1.1 e m a i l : service@ai mtron.c o m . tw 10
a t 1 3 0 9 pr eliminary product information m i c r o - p o w e r s t e p u p d c - d c c o n v e r t e r application informat io n external components of boost converter can be designed by perform i ng si m p l e calculation s . boost inductor inductor selection depends on input voltage, output voltage, m a xi mum output current, switching frequency and availability of i nductor values. the following boost circui t equations are useful in choosing the induc tor values based on the application. they allow the trading of peak current and induc tor value while allowi ng for consideration of com pone nt availability and cost. the peak inductor current is given by: d i i i i i o lavg l lavg lpeak ? = ? + = 1 2 where: ? i l is the inductor peak-to-peak cu rrent ripple and is decided by: osc in l f d l v i = ? d is the mo sfet turn on ratio and is decided by: o in o v v v d ? = f osc is the switching frequency . the inductor should be chosen to be able to handle this current and inductor saturation current rating should be greater than i peak . diode selec t ion the output diode has average current of i o , and peak curren t the sam e as the inductor ? s peak current and a voltage ra ting at least 1.5 tim e s the output voltage. schottky diode is recomm ended and it shoul d be able to handle those current. output capacitor the a t 1308 is specially com p ensated to be st able with capacitors which have a w o rst - case m i ni mum value of 1uf at the particular v out being s e t. output ripple voltage requirem e nts also determ ine the m i nim u m valu e and type of capac ito rs. output ripp le voltage consists of two com ponents the voltage drop caused by the switching current through the esr of the output capacitor an d the char ging and dischar g ing of the output capacitor : osc out o o in o lpeak ripple f c i v v v esr i v ? + = for low esr ceram ic c a pacitors, the output ripple is dom i n ated by the char ging or dischar g ing of the output capacitor . 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 3/2/2006 rev : 1.1 e m a i l : service@ai mtron.c o m . tw 11
a t 1 3 0 9 pr eliminary product information m i c r o - p o w e r s t e p u p d c - d c c o n v e r t e r im pacting frequency stability of the overall control loop, ceram i c capacitors are preferred on the output capacitance, but tant alu m capacitor m a y also suf f ice. if it use tantalum capacitor on the output term inal, th at in addition the cap acitance parallel with feedback resisto r network is n ecessary . these frequency response ef fects together with the internal frequency co m p ensa tion circuitry of a t 1308 m odi fy the gain and phase shift of th e closed loo p system . pcb layout guidelines careful printed circuit layout is extrem el y im portant to avoid causing parasitical capacitance and line inductance. the followi ng layout guidelines are recomm ended t o achieve optimum perfor m a nce. ? please the boost converter diode and induc tor close to the lx pin and no via. keep traces short, direct, and wide. ? please ceram i c bypass capacitors near the input/output pin. ? locate all feedback sens e resistors as cl ose to the feedback pins as possible. ? the ground connections of v in and v out should be as close together as possible. 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 3/2/2006 rev : 1.1 e m a i l : service@ai mtron.c o m . tw 12
a t 1 3 0 9 pr eliminary product information m i c r o - p o w e r s t e p u p d c - d c c o n v e r t e r small ou tline sot - 25 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 3/2/2006 rev : 1.1 e m a i l : service@ai mtron.c o m . tw 13
a t 1 3 0 9 pr eliminary product information m i c r o - p o w e r s t e p u p d c - d c c o n v e r t e r reflow pr ofiles sn-pb eutectic assembl y pb-free assembl y 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 ss 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 te mpe r a t ure s re fe r to top s ide of t h e p a c k a g e , me asure d on t h e p a c k a g e body s u rfa c e . 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 3/2/2006 rev : 1.1 e m a i l : service@ai mtron.c o m . tw 14

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