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AIC1639 1-cell, 3-pin, step-up dc/dc controller features description a guaranteed start-up from less than 0.9 v. high efficiency. low quiescent current. less number of external components needed. low ripple and low noise. fixed output voltage: 2.7, 3.0v, 3.3v, and 5v. driver for external transistor. space saving package: sot-23, sot-89 and to-92. applications pagers. cameras. wireless microphones. pocket organizers. battery backup suppliers. portable instruments. the AIC1639 is a high efficiency step-up dc/dc controller for applications using 1 to 4 battery cells. only three external components are required to deliver a fixed output voltage of 2.7, 3.0v, 3.3v, or 5v. the AIC1639 starts up from less than 0.9v input with 1ma load. pulse frequency modulation scheme brings opti- mized performance for applications with light output loading and low input voltages. the out- put ripple and noise are lower compared with the circuits operating in psm mode. the pfm control circuit operating in 100khz (max . ) swit ching rat e result s in smaller passiv e components. the space saving sot-23, sot- 89 and to-92 packages make the AIC1639 an ideal choice of dc/dc controller for space con- scious applications, like pagers, electronic cameras, and wireless microphones. provided with an external transistor driver pin (ext), the AIC1639 is recommended for appli- cations requiring current as large as several tens to several hundreds of milli-amperes. typical application circuit vo ut a i c 1639- 27 a i c 1639- 30 a i c 1639- 33 a i c 1639- 50 gn d *q1: s a n y o 2 5 d1 803 s - tc 60 v / 5a /20w + ex t d1 v out *q 1 2sd 1803 c2 1 0nf r1 l1 33 h v in + c1 47 f 30 0 g s ss14 c3 10 0 f 100ma load current step-up conv erter a n alog integrations corporation si-soft research center ds-1639p-05 010405 3a1, no.1, li-hsin rd. i , science park , hsinchu 300, taiw an , r.o.c. te l: 886-3-5772500 fa x : 886-3-5772510 www. anal og.c o m .tw 1
! ! AIC1639 ! ! ! ordering information pa c k i n g t y p e t r : t ape & r eel bg : bag p a c kag e t y pe x : so t - 89 z: to-9 2 u: so t - 23 c: com m e rc i a l p: lead f r ee com m e r c ial o u t p u t vo l t ag e 27: 2.7v 30: 3.0v 33: 3.3v 50: 5.0v a i c 1639- x x x x xx 12 3 so t - 89 t o p view 1: gnd 2: vo ut 3: ex t t o - 92 t o p view 1: gnd 2: vo ut 3: ex t orde ring informa t ion 1 2 3 ex : AIC1639- 27cx t r 2.7v v e r s ion, in so t - 89 pac k age & t r pac k ing t y pe AIC1639- 27px t r 2.7v v e r s ion, in so t - 89 lead f r ee pac k age & t r pac k ing t y pe so t - 23 t o p view 1: gnd 2: ex t 3: vo ut 1 3 2 ! part no. cx px a i c 1 6 3 9 - 2 7 x x a u 2 7 a u 2 7 p a i c 1 6 3 9 - 3 0 x x a u 3 0 a u 3 0 p a i c 1 6 3 9 - 3 3 x x a u 3 3 a u 3 3 p a i c 1 6 3 9 - 5 0 x x a u 5 0 a u 5 0 p sot-23 marking part no. c u p u a i c 1 6 3 9 - 2 7 d b 2 7 d b 2 7 p a i c 1 6 3 9 - 3 0 d b 3 0 d b 3 0 p a i c 1 6 3 9 - 3 3 d b 3 3 d b 3 3 p a i c 1 6 3 9 - 5 0 d b 5 0 d b 5 0 p sot-89 marking ! ! 2 !
AIC1639 absoluate maximum ratings supply voltage (vout pin) ??????.???????????????????.6v ext pin voltage ???????????????????????.-0.3v to vout+0.3v ext pin current ????????????????????????????. 50ma operating temperature range ??????????????????.-40 c to 85 c maximum junction temperature 125 c storage temperature range ??????????????????? -65 c to 150 c lead temperature (soldering 10 sec.) ???????????????????260 c absolute m aximum ratings are those values beyond which the life of a device may be impaired. test circuit f out ex t a i c1 639 2. 5v vo ut gn d oscillator test circuit 3
electrical characteristics (t a =25 output voltage AIC1639-27 v in =1. 8 v AIC1639-30 v in =1. 8 v AIC1639-33 v in =2. 0 v AIC1639-50 v in =3. 0 v v out 2.633 2.925 3.218 4.875 2.700 3.000 3.300 5.000 2.767 3.075 3.382 5.125 v input voltage v in 6 v start-up voltage i out =1ma , v in :0 2v v start 0 . 8 0 . 9 v hold-on voltage i out =1ma , v in :2 0v v hold 0 . 6 v no-load input current i out =0ma i in 1 8 a supply current 1 AIC1639-27 AIC1639-30 AIC1639-33 AIC1639-50 ext at no load, v in =v out x 0.95 measurement of the ic input cur- rent (vout pin) i dd1 45 50 60 80 a supply current 2 AIC1639-27 AIC1639-30 AIC1639-33 AIC1639-50 ext at no load, v in =v out + 0.95 measurement of the ic input cur- rent (vout pin) i dd2 7 7 7 7 a ext ?h? on-resistance AIC1639-27 AIC1639-30 AIC1639-33 AIC1639-50 v ext =v out ? 0.4v r exth 300 200 185 130 ? ext ?l? on-resistance AIC1639-27 AIC1639-30 AIC1639-33 AIC1639-50 v ext = 0.4v r extl 110 80 70 60 ? 4
electrical characteristics (continued) parameter test conditions symbo l m i n . t y p . m a x . unit oscillator duty cycle v in =v out x 0.95 measurement of the ext pin wav e form d u t y 6 5 7 5 8 5 % max. oscillator freq. v in =v out x 0.95 measurement of the ext pin wav e form f os c 8 0 1 0 5 1 3 0 k h z effic i enc y 8 0 % note 1: specifications are production tested at t a =25 c. specifications over the -40 c to 85 c operating tem- perature range are assured by design, characterizati on and correlation with statistical quality controls (sqc). typical performance characteristics inductor (l1) : 33 h (pin type) capacitor (c1) : 47 f (tantalum type) diode (d1) : 1n5819 schottky type transistor (q1) : 2sd1803 0 50 10 0 1 5 0 2 0 0 2 5 0 3 0 0 3 5 0 40 0 4 5 0 50 0 2. 4 0 2. 4 5 2. 5 0 2. 5 5 2. 6 0 2. 6 5 2. 7 0 2. 7 5 2. 8 0 f i g. 1 AIC1639- 27 load r e g u lati on ( l = 3 3 h) v in =2 . 0 v v in =1 . 8 v v in =1 . 5 v v in =1 . 2 v v in =0. 9 v o u tp u t v o l t a g e (v ) o u t put cur r ent ( m a) 0 5 0 10 0 1 5 0 20 0 25 0 3 0 0 3 5 0 40 0 4 5 0 5 0 0 5 0 5 5 6 0 6 5 7 0 7 5 8 0 8 5 9 0 f i g. 2 ai c 163 9-27 ef f i c i enc y ( l =33u h ) ef f i c i ency ( % ) o u t put cur r ent ( m a) v in =2 . 0 v v in =1 . 8 v v in =1 . 5 v v in =1 . 2 v v in =0. 9 v 0 5 0 10 0 1 5 0 20 0 2 5 0 3 0 0 3 5 0 40 0 45 0 2. 4 2. 5 2. 6 2. 7 2. 8 2. 9 3. 0 3. 1 fi g . 3 aic 1 639-30 load r e g ul at i on ( l=33 h ) outp ut v o l t ag e (v) o u tp ut cur r en t (m a) v in =2.0v v in =1.8v v in =1 . 5 v v in =1.2 v v in =0 .9v o u tp ut cur r en t (m a) 0 5 0 10 0 1 5 0 20 0 2 5 0 30 0 3 5 0 40 0 45 0 6 0 6 5 7 0 7 5 8 0 8 5 9 0 f i g. 4 AIC1639- 30 ef f i c i enc y ( l = 3 3 h) ef fic i ency (%) v in =2 . 0 v v in =1.8 v v in =1 .5v v in =1.2 v v in =0 . 9 v 5
typical performance characteristics (continued) outpu t v o l t age (v ) o u tput cur r ent ( m a) f i g. 5 AIC1639- 33 load i n g re g u l a t i o n (l= 3 3 h) 0 5 0 10 0 1 5 0 20 0 2 5 0 30 0 3 5 0 40 0 2. 4 26 2. 8 3. 0 3. 2 3. 4 v in =2.0 v v in =1.5 v v in =1 . 2 v o u tput curr ent (m a) e f fi c i e n c y (%) 0 5 0 10 0 1 5 0 20 0 2 5 0 30 0 35 0 4 0 0 6 0 6 5 7 0 7 5 8 0 8 5 9 0 f i g. 6 AIC1639- 33 ef f i c i enc y ( l = 3 3 h) v in =2.0v v in =1 .5v v in =0 . 9 v outp ut v o lt ag e (v) ou t p ut cur r en t ( ma ) f i g. 7 AIC1639- 50 load r e g u l a ti on (l= 3 3 h) 0 1 0 0 2 00 3 0 0 4 00 5 0 0 60 0 7 0 0 3. 2 5 3. 5 0 3. 7 5 4. 0 0 4. 2 5 4. 5 0 4. 7 5 5. 0 0 5. 2 5 v in =3.0 v v in =2 .0v v in =1 . 5 v v in =0 . 9 v v in =1.2 v ou t p ut cur r en t ( ma ) 0 10 0 2 0 0 30 0 4 0 0 50 0 60 0 7 0 0 4 0 4 5 5 0 5 5 6 0 6 5 7 0 7 5 8 0 8 5 9 0 f i g. 8 AIC1639- 50 ef f i ci enc y (l= 3 3 h) e f fi ci e n cy ( % ) v in =3.0 v v in =2 . 0 v v in =1.5 v v in =0.9 v v in =1.2 v o u t p ut v o ltag e ( v ) ou t p u t cur r ent ( ma ) 0 2 0 4 0 6 0 8 0 10 0 1 2 0 14 0 16 0 1 8 0 20 0 0. 0 0. 2 0. 4 0. 6 0. 8 1. 0 1. 2 1. 4 1. 6 1. 8 2. 0 f i g. 9 ai c 163 9-27 s t ar t- up & h o ld- on v o l t a g e ( l = 3 3 h) st a r t u p hol d o n ou t p ut c u rr ent ( ma ) 0 2 0 4 0 60 8 0 1 0 0 1 20 1 4 0 1 60 0. 0 0. 2 0. 4 0. 6 0. 8 1. 0 1. 2 f i g. 10 AIC1639- 30 s t ar t - up & hol d - on v o l t a g e ( l = 3 3 h) st a r t u p hol d o n in pu t v o l t a g e (v ) 6
typical performance characteristics (continued) ou t p ut cur r en t ( ma ) 0 2 0 40 6 0 8 0 10 0 1 2 0 14 0 1 6 0 0. 0 0. 2 0. 4 0. 6 0. 8 1. 0 1. 2 f i g. 1 1 AIC1639- 33 s t ar t- up & hol d - on v o l t ag e ( l =33 h) i n p u t v o ltag e ( v ) st a r t u p hol d o n ou t p u t cur r ent ( ma ) inp u t v o l t ag e (v ) f i g. 12 ai c 1639- 50 s t ar t- up & h o l d - on v o l t a g e ( l = 3 3 h) 0 2 0 4 0 6 0 8 0 10 0 1 2 0 14 0 1 6 0 0. 0 0. 2 0. 4 0. 6 0. 8 1. 0 1. 2 1. 4 1. 6 st a r t u p hol d o n ou t p ut cur r en t ( ma ) 0 2 0 40 6 0 8 0 10 0 1 2 0 14 0 1 6 0 0. 0 0. 2 0. 4 0. 6 0. 8 1. 0 1. 2 f i g. 13 AIC1639- 33 s t ar t - up & hol d - on v o l t a g e ( l = 3 3 h) inp u t v o l t ag e (v ) st a r t u p hol d o n ou t p u t cur r ent ( ma ) inp u t v o l t ag e (v ) f i g. 14 ai c 1639- 50 s t ar t- up & h o l d - on v o l t a g e ( l = 3 3 h) 0 2 0 4 0 6 0 8 0 10 0 1 2 0 14 0 1 6 0 0. 0 0. 2 0. 4 0. 6 0. 8 1. 0 1. 2 1. 4 1. 6 st a r t u p hol d o n out p ut cur r ent ( ma ) -40 - 20 0 2 0 4 0 60 8 0 10 0 2. 0 2. 5 3. 0 3. 5 4. 0 4. 5 5. 0 5. 5 6. 0 f i g. 15 AIC1639 o u t put v o l t a g e v s . t e m per atur e outp ut v o l t ag e ( v ) v out = 3. 3v v out = 3. 0v v out = 2. 7v v out =5. 0 v ou t p ut curr ent ( ma ) -4 0 - 2 0 0 2 0 4 0 6 0 8 0 10 0 8 5 9 0 9 5 10 0 10 5 11 0 11 5 12 0 12 5 13 0 13 5 f i g. 16 ai c 1639 swi t chi ng fre q uenc y v s . t e m per atu r e sw i t c h in g fr e q ue nc y ( khz ) v out = 5. 0v v out = 3. 3v v out = 3. 0v v out = 2. 7v 7
typical performance characteristics (continued) ou t p u t cur r ent ( ma ) -4 0 - 2 0 0 2 0 4 0 6 0 8 0 10 0 7 0 71 7 2 7 3 7 4 7 5 7 6 7 7 7 8 7 9 8 0 f i g. 17 AIC1639 m a x i m u m duty c y c l e v s . t e m per a t ur e ma xi m u m du t y c y cl e ( % ) v out = 2. 7v v out = 3. 0v v out = 3. 3v v out = 5. 0v -4 0 - 2 0 0 2 0 4 0 6 0 8 0 10 0 3 0 3 5 4 0 4 5 5 0 5 5 6 0 6 5 7 0 7 5 8 0 f i g. 18 AIC1639 sup p l y c u r r ent v s . t e m p e r atur e s u pp l y cu rren t id d1 ( p a) te m p er a t ur e ( q c ) v out = 5. 0v v out = 3. 3v v out = 3. 0v v out = 2. 7v -4 0 -20 0 2 0 4 0 6 0 80 1 0 0 4 0 5 0 6 0 7 0 8 0 9 0 10 0 11 0 12 0 13 0 f i g. 19 AIC1639 ext " l " on- r esistance res i st an ce ( ? ) t e m per a t ur e ( q c) v out = 2. 7v v out = 3. 0v v out = 3. 3v v out = 5. 0v te m p er a t ure ( q c ) -40 - 2 0 0 2 0 4 0 6 0 8 0 10 0 40 80 12 0 16 0 20 0 24 0 28 0 32 0 36 0 40 0 f i g. 20 aic 1 639 ex t "h" o n - r es i s tanc e re s i sta n ce ( ? ) v ou t = 2. 7v v ou t = 3. 0v v ou t = 3. 3v v ou t = 5. 0v 8
AIC1639 block diagram + gn d vo u t ex t 1. 25v re f . 1m e nabl e - o s c, 100k hz pin descriptions pin 1 : gnd - ground. must be low imped- ance; solder directly to ground plane. pin 2 : vout - ic supply pin. connect vout to the regulator output. pin 3: ext - push pull driver output for ex- ternal power switch. application information general description AIC1639 pfm (pulse frequency modulation) con- troller ics combine a switch mode regulator, push pull driver (AIC1639), precision voltage ref- erence, and voltage detector in a single mono- lithic device. they offe r both extreme low quies- cent current, high efficiency, and very low gate threshold voltage to ensure start-up with low bat- tery voltage ( 0.8v typ.). designed to maximize battery life in portable products, and minimize switching losses by only switching as needed service the load. pfm controllers transfer a discrete amount of energy per cycle and regul ate the output voltage by modulating switching frequency with the con- stant turn-on time. switching frequency depends on load, input voltage, and inductor value, and it can range up to 100khz. when the output voltage drops, the error com- parator enables 100khz oscillator that turns on the mosfet around 7.5 s and 2.5 s off time. turning on the mosfet allows inductor current to ramp up, storing energy in a magnetic field. when mosfet turns off that forces inductor cur- rent through diode to the output capacitor and load. as the stored energy is depleted, the cur- rent ramp down until the diode turns off. at this point, inductor may ring due to residual energy and stray capacitance. the output capacitor stores charge when current flowing through the diode is high, and release it when current is low, thereby maintaining a steady voltage across the load. as the load increases, the output capacitor dis- charges faster and the error comparator initiates cycles sooner, increasing the switching fre- quency. the maximum duty cycle ensure ade- 9
! ! AIC1639 ! ! ! i pk i in v ex t i sw i ou t v sw i d t quate time for energy transfer to output during the second half each cycle. depending on circuit, pfm controller can operate in either discontinu- ous mode or continuous conduction mode. the continuous conduction mode means that the in- ductor current does not ramp to zero during each cy cle. + v in sw v ou t ex t i d i ou t is w ic o i in i pk i in v ex t i sw i ou t t di s c h ar ge c o . v sw d i s c ha r g e co . i d t continuous conduction mode at the boundary between continuous and discon- tinuous mode, output curr ent (iob) is determined by () x 1 * t * l v * 2 1 * v v v i on in d out in ob ? ? ? ? ? ? ? + = where v d is the diode drop, l t ) r (r x on s on ? + = r on = switch turn on resistance, r s = inductor dc resistance t on = switc h on time in the discontinuous mode, the switching fre- quency (fsw) is discontinuous conduction mode ) x (1 * t * v ) (i * ) v v (v * 2(l) f 2 on 2 in out in d out sw + ? + = in the continuous mode, the switching frequency is ! 10 !
! ! AIC1639 ! ! ! () ? ? ? ? ? ? ? + ? + ? ? + ? + ? + ? + = () ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? + ? ? ? ? ? ? ? ? + = ? + = = ? + = ? ? ? ? ? ? ? ? ? ? ? ? ? ? + ? ? ? ? ? ? ? ? ? + = ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? + =
! ! AIC1639 ! ! ! ! 12 ! table 1 indicates resistance and height for each coil. pow e r inductor ty pe inductance ( ? () () ? ? ? ? ? ? + ? ? ? ? ? ? = () ( ) ? ? ? ? ? ? = () ? ? ? ? ? ? =
AIC1639 physical dimensions (unit: mm) sot -23 0 0. 9 0 0. 3 0 1.50 2.6 0 2.8 0 0. 0 8 0. 3 0 0. 0 5 e l1 l e1 c e e1 d b a2 a1 0 . 95 bsc 8 0.6 0 1.90 bsc 0. 60 ref 1. 3 0 1. 7 0 3. 00 3. 00 0.2 2 0.5 0 0.1 5 0. 9 5 mi n. s y m b o l a 1 .45 max. so t- 2 3 m i ll i m et er s c a a2 b with pl a t in g 13 sot-89 view b l1 l a c e1 e d d1 h e l 0.36 2.29 1.50 4.40 0.35 0.44 e1 d e e d1 c b1 b 3.0 0 b s c 0.48 2.60 1.83 4.6 0 0.44 0.56 1.50 bsc 1.40 min. s y m b o l a 1.60 ma x. sot-8 9 mi llim e ters se ating plan e gauge pla n e 0.2 5 a1 s e c t i o n a- a b a se metal e1 e d e aa e1 see view b 0.89 3.94 b b1 l h 1.20 4.2 5
! ! AIC1639 ! ! ! ! 14 millimete r s to-92 ma x. 5. 3 3 a s y m b o l min. 4. 3 2 0. 4 7 4. 1 9 2.6 6 1.3 9 5. 2 0 2.6 6 b d e e1 l j e s 0. 3 6 3. 1 8 2. 4 2 1. 1 5 3. 4 3 12 .7 0 4. 4 5 2. 0 3 information provided by aic is believed to be accurate and reli able. how e ver, w e cannot assume responsibility for use of any ci rcui try other than ci rcui try enti r el y embodi ed i n an aic product; nor for any i n fri ngement of patents or other ri ghts of thi r d par- ti es that may resul t from i t s use. we reserve the ri ght to change the ci rcui try and speci f i c ati ons w i thout noti c e. li fe support pol i c y : aic does not authori z e any aic product for us e i n l i f e support devi c es and/or sy stems. li fe support devi c e s or sy stems are devi c es or sy stems w h i c h, (i) are i n tended for surg i c al i m pl ant i n to the body or (i i ) support or sustai n l i f e, a nd w hose fai l u re to perform, w hen properl y used i n accordance w i th i n structi ons for use provi ded i n the l abel i ng, can be reasonabl y expected to resul t i n a si gni fi cant i n j u ry to the user. !

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