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AIC1612 high efficiency selectable current limit synchronous step-up dc/dc converter features high efficiency (9 3 % when v in =2. 4 v , v out = 3 .3v, i out =200ma) output current up to 500ma. (v in =2. 4 v , at v out = 3 .3v, clsel= o ut) 20 a quiescent supply current. power-saving shutdown mode (0.1 a typic a l). internal synchronous rectifier (no external diode required). selectable current limit for reduced ripple low noise , anti-ringing feature. on-chip low battery detector. low battery hysteresis space-saving package: msop-10 applications palmtop & notebook computers. pdas wireless phones pocket organizers. digital cameras. hand-held devices with 1 to 3-cell of nimh/nicd batteries . description AIC1612 is a high efficiency step-up dc-dc converter. the start-up voltage is as low as 0.8v with operating voltage down to 0.7v. sim- ply consuming 20 a of quiescent current, these devices offer a built-in sy nchronous rectifier that reduces size and cost by eliminating the need for an external schottky diode and improves overall efficiency by minimizing losses. the switching frequency can range up to 500khz depending on the load and input volt- age. the output voltage can be easily set by two external resistors from 1.8v to 5.5v, con- necting fb to out to get 3.3v, or connecting to gnd to get 5.0v. in terms of design flexibility, the peak current of internal switch is selectable (0.65a or 1.0a). AIC1612 also features a circuit that eliminates noise due to inductor ringing. typical application circuit out put 3. 3v , 5. 0v o r ad j. ( 1 .8 v to 5. 5v ) up t o 300m a low -bat t e ry d e te ct o u t a i c1612 out fb gnd re f lb o sh d n l x lb i + on off + low b a t t ery det e c t i on 0. 1 f v in 22 h 47 f 47 f s e l e c t abl e current li m i t (1. 0 a or 0. 65a ) c l sel 200 ? batt a n alog integrations corporation si-soft research center ds-1612p-03 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
AIC1612 ordering information a i c 16 12x xx x pi n co n f i g ura ti o n t o p vi e w 1 3 4 2 10 8 7 9 fb lb i lb o cl sel ref ou t lx gn d b a tt sh d n 5 6 e x am pl e : a i c 1 6 12c o t r i n m s o p - 1 0 p a c k ag e & t a pi n g & r e e l p a c k i ng t y pe a i c 1 6 12p o t r i n m s o p - 1 0 lea d f r ee p a c k ag e & t a p i ng & r eel p a c k i ng t y pe pac ki n g t y pe t r : t ape & r eel pac kag i n g t y pe o : m s o p -10 c : c o m m e r c ia l p : lea d f r ee c o m m er c i al absolute maximum ratings supply voltage (out to gnd) 8.0v switch voltage (lx to gnd) v out + 0.3v battery voltage (batt to gnd) 6.0v , lbo to gnd 6.0v shdn lbi, ref, fb, clsel to gnd v out +0. 3 v switch current (lx) -1.5a to + 1 .5a output current (out) -1.5a to + 1 .5a operating temperature range -40 c ~ +85 c maximum junction temperature 125 c storage temperature range -65 c ~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 refer to typical application circuit. 2
AIC1612 electrical characteristics (v in = 2 .0v, v out =3. 3 v , fb=v out , t a =25 c, unless otherw ise specified.) (note1) parameter test conditions min. typ. max. unit minimum input voltage 0.7 v operating v o l t a g e 1 . 1 5 . 5 v start-up voltage r l =3k ? (note2) 0.8 1.1 v start-up voltage tempco -2 mv/ c output voltage range v in AIC1612 electrical characteristics (continued) parameter test conditions min. typ. max. unit lx switch on-time v fb = 1 v , v out = 3.3v 2 4 7 s lx switc h off-time v fb = 1 v , v out = 3.3v 0.6 0.9 1.4 s fb input current v fb = 1.4v 0.03 50 na lbi input current v lbi = 1.4v 1 50 na clsel input current clsel = out 1.4 3 a shdn input current v shdn = 0 or v out 0 . 0 7 5 0 n a lbo low output voltage v lbi = 0, i sink = 1ma 0.2 0.4 a lbo off leakage current v lbo = 5.5v, v lbi = 5.5v 0.07 1 lbi h y s t e r e i s i s 5 0 m v damping switch resistance v batt = 2v 50 100 ? v il 0.2v out shdn input voltage v ih 0 . 8 v out v v il 0.2v out clsel input voltage v ih 0 . 8 v out v 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). note 2: start-up voltage operation is guar anteed without the addition of an ex ternal schottky diode between the input and output. note 3: steady-state output current indicates that the dev ice maintains output voltage regulation under load. note 4: device is bootstrapped (power to the ic comes from out). this correlates directly with the actual bat- tery supply. 4
AIC1612 typical performance characteristics input batter y cur r ent ( a) inpu t battery vol t age (v) f i g. 1 no-load battery cu rr ent vs . input battery 0. 0 0. 5 1.0 1.5 2.0 2. 5 3. 0 3.5 0 20 40 60 80 100 120 140 160 v ou t =5v ( f b=g nd) v ou t =3.3v ( f b=o u t ) sh u t do wn cu rre nt cur r ent ( a) s upp ly v o lt a ge (v ) f i g. 2 shut do w n curr ent v s . suppl y v o l t age 1. 0 1. 5 2.0 2.5 3. 0 3.5 4.0 4.5 5. 0 5.5 0. 0 0. 1 0. 2 0. 3 0. 4 0. 5 f i g. 3 s t art- up v o lt age v s . o u tput cur r ent st a r t - u p vo l t a g e ( v ) 0. 01 0.1 1 10 10 0 0. 0 0. 2 0. 4 0. 6 0. 8 1. 0 1. 2 1. 4 1. 6 1. 8 v ou t =5v ( f b= gnd) o u tp ut cu rre nt (m a) v out =3.3v ( f b=o u t ) f i g. 4 t u rni ng poi n t betw een c c m & dcm cc m/d c m b ound a r y o u tput cur r e n t (ma ) input v o lt age (v) 0. 5 1.0 1. 5 2. 0 2. 5 3. 0 3. 5 4.0 4. 5 5. 0 0 50 10 0 15 0 20 0 25 0 30 0 35 0 40 0 v ou t =5. 0 v ( f b=g n d ) v ou t =3. 3 v ( f b=o u t ) l= 22 h c in =1 00 f c ou t =1 00 f f i g. 5 eff i cien c y vs. o u tput c u r r ent (r ef . to f i g.35) e f f i c i en cy (% ) 0.0 1 0. 1 1 10 10 0 100 0 0 10 20 30 40 50 60 70 80 90 10 0 v in =3 . 6 v o u t put cu r r ent (ma ) v in =2 . 4 v v in =1.2v cl se l = ou t (i li mi t =1 a) v ou t =5v ( f b=g nd) f i g. 6 ri ppl e v o l t age (r ef . to f i g.35) r i pp le v o l t age (m v ) o u t put cu r r ent (ma ) 0 50 10 0 15 0 200 25 0 30 0 35 0 40 0 45 0 50 0 55 0 600 65 0 0 20 40 60 80 10 0 12 0 14 0 16 0 18 0 20 0 22 0 v in =2 . 4 v v in =1 . 2 v v ou t =5 .0v l= 22 h c in =4 7 f c ou t =4 7 f v in =3 . 6 v clsel= o ut (i li mi t =1a) 5
AIC1612 typical performance characteristics (continued) f i g. 7 ri ppl e v o l t age (r ef . to f i g.35) r i pp le v o l t age (m v ) o u t put cu r r ent (ma ) 0 10 0 20 0 30 0 40 0 50 0 60 0 70 0 80 0 0 40 80 120 160 200 240 v in =2.4v v ou t =5 .0 v l=2 2 h c in = 100 f c ou t =1 00 f v in =3 . 6 v v in =1 .2 v clsel= o ut (i li mi t =1a) f i g. 8 eff i cien c y vs. o u tput c u r r ent (r ef . to f i g.35) e f f i c i en cy (% ) o u t put cu r r ent (ma ) 0. 0 1 0. 1 1 10 10 0 100 0 0 10 20 30 40 50 60 70 80 90 100 v in =3 . 6 v v in =1 . 2 v v in =2 . 4 v clsel=gnd (i li mi t =0.65a) v ou t =5v ( f b=g n d) f i g. 9 ri ppl e v o l t age (r ef . to f i g.35) r i pp le v o l t age (m v ) o u t put cu r r ent (ma ) 0 50 10 0 15 0 200 25 0 30 0 35 0 40 0 45 0 50 0 55 0 0 20 40 60 80 10 0 12 0 14 0 16 0 v ou t =5 .0 v l= 22 h c in =4 7 f c ou t =4 7 f v in =3 . 6 v v in =2 . 4 v v in =1.2v clsel=gnd ( i li m i t = 0 .65 a ) f i g. 10 ripp le v o lt age ( r ef . to f i g.35) r i pp le v o l t age (m v ) o u t put cu r r ent (ma ) 0 10 0 20 0 30 0 40 0 50 0 60 0 0 20 40 60 80 10 0 12 0 v in =2 . 4 v v in =1.2v v ou t =5 .0v l= 22 h c in = 100 f c ou t = 100 f v in =3 . 6 v clsel=gnd ( i li m i t = 0 .65 a ) f i g. 1 1 eff i ciency vs. o u tput c u r r ent (r ef . to f i g.34) (v ) ef ficiency (%) o u t put cu r r ent (ma ) 0.0 1 0. 1 1 10 10 0 10 00 0 10 20 30 40 50 60 70 80 90 10 0 v in =2 . 4 v v in =1 . 2 v cl se l = ou t (i li mi t =1 a) v ou t =3. 3 v ( f b=o u t ) f i g. 12 ripp le v o lt age ( r ef . to f i g.34) r i pp le v o l t age (m v ) o u t put cu r r ent (ma ) 0 50 10 0 15 0 20 0 250 30 0 35 0 40 0 45 0 50 0 55 0 600 0 20 40 60 80 10 0 12 0 14 0 16 0 18 0 20 0 22 0 24 0 26 0 v in =1.2v v ou t =3 .3v l= 22 h c in =4 7 f c ou t =4 7 f v in =2 . 4 v clsel= o ut (i li mi t =1a) 6
AIC1612 typical performance characteristics (continued) f i g. 13 ripp le v o lt age ( r ef . to f i g.34) ri pple v o lt ag e ( m v ) o u t put cu r r ent (ma ) 0 50 100 15 0 20 0 250 30 0 35 0 40 0 450 50 0 55 0 0 20 40 60 80 10 0 12 0 14 0 v ou t =3. 3 v c in =100 f c ou t =1 0 0 f v in =1 . 2 v v in =2.4v a ic1610 (i li m i t =1a) clsel= o ut (i li mi t =1a) fig. 14 eff i c i enc y vs . o u tput curr ent ( r ef . to f i g . 34) e f f i c i en cy (% ) o u t put cu r r ent (ma ) 0. 01 1 10 10 0 1 000 0 10 20 30 40 50 60 70 80 90 10 0 v in =1 . 2 v v in =2 . 4 v c l sel= gnd (i li mi t =0.65a) v ou t =3 . 3 v ( f b= o u t ) f i g. 15 ripp le v o lt age ( r ef . to f i g.34) r i pp le v o l t age (m v ) o u t put cu r r ent (ma ) 0 5 0 10 0 15 0 20 0 25 0 30 0 35 0 40 0 450 50 0 0 20 40 60 80 10 0 12 0 14 0 v ou t =3 .3 v l= 22 h c in =4 7 f c ou t =4 7 f v in =1.2v v in =2.4v clsel= g nd ( i li m i t = 0 .65a) f i g. 16 ripp le v o lt age ( r ef . to f i g.34) r i pp le v o l t age (m v ) o u t put cu r r ent (ma ) 0 50 10 0 15 0 20 0 25 0 30 0 35 0 40 0 45 0 50 0 0 10 20 30 40 50 60 70 80 90 10 0 11 0 12 0 v ou t =3 .3v l= 22 h c in =10 0 f c ou t =1 00 f v in =1 . 2 v v in =2 . 4 v clsel=gnd ( i li m i t = 0 .65 a ) f i g. 17 ref e r ence v o l t ag e vs. t e m peratur e r e fer e n c e v o lt age (v ) t e m p era t ure ( c) -4 0 -2 0 0 20 40 60 80 1.2 0 1.2 1 1.2 2 1.2 3 1.2 4 1.2 5 1.2 6 i ref =0 f i g. 18 s w it ch r e sist a n ce v s . t e m p e r atu r e r e si st ance ( ? ) t e mper at ur e ( c) - 60 - 40 -2 0 0 20 40 60 80 100 0. 00 0. 05 0. 10 0. 15 0. 20 0. 25 0. 30 0. 35 0. 4 0 0. 45 0. 50 p - c h ann el n - c h an nel v ou t =3 . 3 v i lx =1 00 m a 7
AIC1612 ? typical performance characteristics (continued) f i g. 19 max i m u m o u tput curr ent vs . input v o l t age maxim u m o u t put c u r r ent ( m a ) 1. 0 1.2 1.4 1. 6 1. 8 2.0 2. 2 2. 4 2. 6 2.8 3.0 0 10 0 20 0 30 0 40 0 50 0 60 0 70 0 80 0 input v o l t age ( v ) clsel=gnd (i li mi t =0 . 6 5 a ) clsel= o ut (i li m i t =1 a) v ou t =3.3v ( f b=o u t ) input v o l t age ( v ) fig. 20 max i m u m o u tput c u r r ent vs . input v o lt a g e maxim u m o u t put c u r r ent ( m a ) 1. 0 1. 5 2.0 2. 5 3. 0 3. 5 4.0 4.5 0 10 0 20 0 30 0 40 0 50 0 60 0 70 0 80 0 90 0 clsel=gnd (i li mi t =0 . 6 5 a ) clsel=out ( i li m i t =1 a) v ou t =5v ( f b=g nd) f i g. 21 inductor curr e n t vs . o u tput v o l t age i li m ( a ) o u tput v o l t ag e (v) 2.0 2. 5 3.0 3.5 4. 0 4.5 5.0 0. 0 0. 2 0. 4 0. 6 0. 8 1. 0 1. 2 clsel= o ut (i li mi t =1 a) clsel= g nd ( i li m i t =0.65a) suppl y v o l t age ( v ) f i g. 22 sw i t chin g f r e q u e n c y v s . su pp ly vo l t a g e s w itchi ng f r equency fosc ( k h z ) 1. 0 1. 5 2. 0 2. 5 3. 0 3. 5 4. 0 4. 5 0 20 40 60 80 10 0 12 0 14 0 16 0 i ou t =1 00 m a v out =5 .0 v v ou t =3 . 3 v s w it chi ng fr equ ency fosc ( k hz) o u t put cu r r ent ( m a ) 1 10 10 0 10 00 0 20 40 60 80 10 0 12 0 14 0 16 0 18 0 20 0 22 0 v in =2 . 4 v v ou t =3 . 3 v v in =1.2v v ou t =3 . 3 v v in =2.4v v ou t =5 v v in =3.6v v ou t =5v f i g. 23 sw i t c h ing f r equenc y vs . o u tput curr ent w / o d a m p i ng r i ngi ng v in =2. 4 v v out =3 . 3 v f i g. 24 w i t hout d a m p i ng r i ng i ng f unct i on 8
AIC1612 typical performance characteristics (continued) w . da m p i n g ri n g i n g v in =2 . 4 v v ou t =3. 3 v f i g. 25 w i t h d a m p i n g r i n g i n g f u nct i on v in =2 . 4 v v ou t =3. 3 v lo adi ng= 200m a lx p i n w a v e f o r m i ndu ct or c u r r ent v ou t a c c oupl e f i g. 26 h eav y loa d w a v e f o r m loadi ng: 1m a ? 200m a v in =2. 4 v v ou t =3. 3 v v ou t : a c c oupl e f i g. 27 l oad t r ansi e n t r e spon se v in = 2 .0v~3.0v v ou t =3.3v , i out =100m a v ou t f i g. 28 li ne t r ans ient res pons e v in fi g. 2 9 exi t i ng sh ut do w n v ou t v shdn v ou t =3. 3 v c in =c ou t =47 f f i g. 30 ex iting shut dow n v shdn v out v ou t =3.3v c in =c out = 100 f 9
AIC1612 typical performance characteristics (continued) f i g . 31 ex i t i ng shu t down v shdn v out v ou t =5.0v c in =c ou t =47 f f i g . 32 exi t i n g sh u t do wn v out v shdn v ou t =5 . 0 v c in =c ou t =1 00 f block diagram lb o + - + - + - + - + 47 f 47 f 47 h r1 l 200 ? fb re f gn d lx ba t t ou t q3 sw i t c h da m p i n g c4 0. 1 f c1 0. 1 f c3 ou t vi n lbi clse l s hdn f/ f q r s q2 q1 r e fe renc e v o l t age m i rro r m a x i mu m o n - t i m e o ne s hot m i n i mu m o f f - ti m e o ne s hot 10
AIC1612 pin descriptions pin 1: fb- connecting to out to get +3.3v output, connecting to gnd to get +5.0v output, or using a resistor network to set output voltage rang- ing from + 1 .8v to + 5 .5v. pin 2: lbi- low-battery comparator input inter- nally s e ts at + 1 .23v to trip. pin 3: lbo- open-drain low battery comparator output. output is low when vlbi is <1.23v. lbo is high impedance during shutdown. pin 4: clsel- current-limit selects input. clsel= out sets the current limit to 1.0a. clsel=gnd sets the current limit to 0.65a. pin 5: ref- 1.23v re ference voltage. bypass with a 0.1 f capacitor. pin 6: shdn- shutdown input. high=operating, low=shutdown. pin 7: batt- battery input and damping switch connection. if damping switch is unused, leave batt unconnected. pin 8: gnd- ground. pin 9: lx- n-channel and p-channel power mosfet drain. pin 10: out- power output. out provides bootstrap power to the ic. application information overview AIC1612 is a high efficiency, step-up dc-dc con- verter, designed to feature a built-in synchronous rectifier, which reduces si ze and cost by eliminating the need for an external schottky diode. the start- up voltage of AIC1612 is as low as 0.8v and it op- erates with an input voltage down to 0.7v. quies- cent supply current is only 20 a. in addition, AIC1612 features a circuit that eliminates inductor ringing to reduce noise. the internal p-mosfet on- resistance is typically 0.3 ? to improve overall effi- ciency by minimizing ac losses. the output voltage can be easily set by two exte rnal resistors from 1.8v to 5.5v, connecting fb to out to get 3.3v, or con- necting to gnd to get 5.0v. clsel pin of AIC1612 offers a selectable current limit (1.0a or 0.65a). the lower current limit allows the use of a physically smaller inductor in spac e-sensitive applications. pfm control scheme the key feature of AIC1612 is a unique minimum- off-time, constant-on-time , current-limited, pulse- frequency-modulation (pfm) control scheme (see block diagram) with ultra-low quiescent current. the peak current of the internal n-mosfet power switch is selectable. the switch frequency depends on either loading condition or input voltage, and can range up to 500khz. it is governed by a pair of one- shots that set a minimum off-time (1 s) and a maximum on-time (4 s). sy nchronous rectification using the internal synchronous rectifier eliminates the need for an external schottky diode. therefore, the cost and board space are reduced. during the cycle of off-time, p-mosfet turns on and shuts n- mosfet off. due to the low turn-on resistance of mosfet, synchronous rectifier sig- nificantly improves efficiency without an additional external schottky diode. thus, the conversion effi- ciency can be as high as 93%. reference voltage the reference voltage (ref) is nominally 1.23v for excellent t.c. performanc e. in addition, ref pin can source up to 100 a to external circuit with good load regulation (<10mv). a bypass capacitor of 0.1 f is required for proper operation and good performance. 11
AIC1612 shutdow n low -battery detection the whole circuit is shutdown when shdn v is low. at shutdown mode, the current can flow from battery to output due to the body diode of p-mosfet. v out falls to approximately vin-0.6v and lx remains high impedance. the capacitance and load at out de- termine the rate at which v out decays. shutdown can be pulled as high as 6v, regardless of the volt- age at out. AIC1612 contains an on-chip comparator with 50mv internal hysteresis (ref, ref+50mv) for low bat- tery detection. if the voltage at lbi falls below the in- ternal reference voltage, lbo (an open-drain output) sinks current t o gnd. component selection 1. inductor selection an inductor value of 22 h performs well in most applications. the AIC1612 also works with in- ductors in the 10 h to 47 h range. an inductor with higher peak inductor current tends a higher output voltage ripple (i peak output filter capaci- tor esr). the inductor?s dc resistance signifi- cantly affects efficiency. we can calculate the maximum output current as follows: current limit select pin AIC1612 allows a selectable inductor current limit of either 1.0a or 0.65a. the flexibility contributes to designs for higher current or smaller applications. clsel draws 1.4 a when connecting to out. batt/damping sw itch AIC1612 is designed with an internal damping switch (fig.33) to reduce ringing at lx. the damp- ing switch supplies a path to quickly dissipate the energy stored in inductor and reduces the ringing at lx. damping lx ringing does not reduce v out rip- ple, but does reduce emi. r1=200 ? works well for most applications while reducing efficiency by only 1%. larger r1 value provides less damping, but less impact on efficiency. in principle, lower value of r1 is needed to fully damp lx when v out /v in ratio is high. ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? = l 2 v v t i v v i in out off lim out in ) max ( out ........................................................................ (2) where i o u t(max) =maximum output current in amps v in =input voltage l=inductor value in h =efficiency (typically 0.9) t off = l x s w itc h ? off-time in s i lim =1.0a or 0.65a 2. capacitor selection selecting the output voltage the output voltage ripple relates with the peak inductor current and the output capacitor esr. besides output ripple vo ltage, the output ripple current also needs to be concerned. a filter ca- pacitor with low esr is helpful to the efficiency and steady state output current of AIC1612. therefore nippon tantalum capacitor mcm se- ries with 100 f/6v is recommended. a smaller capacitor (down to 47f with higher esr) is ac- ceptable for light loads or in applications that can tolerate higher output ripple. v out can be simply set to 3.3v/5.0v by connecting fb pin to out/gnd due to the use of internal resis- tor divider in the ic (fig.34 and fig.35). in order to adjust output voltage, a resistor divider is connected to v out , fb, gnd (fig.36). vout can be calculated by the following equation: r5=r6 [(v out / v ref )-1] ..................................... (1) where v ref =1.23v and v out ranging from 1.8v to 5.5v. the recommended r6 is 240k ? . 12
AIC1612 pcb lay out and grounding since AIC1612?s switching frequency can range up to 500khz, it makes AIC1612 become very sensitive. so careful printed circuit layout is im- portant for minimizing ground bounce and noise. ic?s out pin should be as clear as possible. and the gnd pin should be placed close to the ground plane. keep the ic?s gnd pin and the ground leads of the input and output filter ca- pacitors less than 0.2in (5mm) apart. in addition, keep all connection to the fb and lx pins as short as possible. in particular, when using ex- ternal feedback resistors, locate them as close to the fb as possible. to maximize output pow- power and efficiency and minimize output ripple voltage, use a ground plane and solder the ic?s gnd directly to the ground plane. fig.37 to 39 are the recommended layout diagrams. ripple voltage reduction two or three parallel output capacitors can sig- nificantly improve output ripple voltage of AIC1612. the addition of an extra input capaci- tor results in a stable output voltage. fig.40 shows the application circuit with the above fea- tures. fig. 41 to 48 are the performances of fig.40. application examples dam p i n g sw i t ch vi n vo ut a i c 1612 out ba tt l x gnd q3 q2 q 1 l1 r1 200 ? 22 h vo ut vi n r2 100k ? a i c 1612 c3 c1 l 22 h 47 f 47 f 0.1 f c2 0.1 f c4 r1 200 ? l o w ba tter y out p ut r4 r3 cl sel l x out fb gnd ref lb i ba tt lb o shdn l: t d k s l f7045t -22om r 90 c 1 , c 3 : n i p p o n t ant al um c a p a ci to r 6m c m 476m b 2 t e r fig.33 simplified damping switch diagram fig.34 v out = 3.3v application circuit. vo ut vi n r2 100k ? a i c 1622 c3 c1 l 22 h 47 f 47 f 0.1 f c2 0.1 f c4 r1 200 ? l o w ba tter y out p ut r4 r3 clsel l x out fb gnd ref lb i ba tt lb o sh dn l: t d k s l f7045t -22om r 90 c 1 , c 3 : n i p p o n t ant al um c a p a c i tor 6m c m 476m b 2 t e r 22 h l: t d k s l f 7 0 45t - 22o m r 90 c 1, c 3 : n i p p o n t a n t alu m c a p a c i tor 6mc m 4 7 6 m b 2t e r v ou t =v re f * ( 1+r 5 / r 6) vo ut vi n 1 00k ? r1 200 ? r2 47 f 47 f 0. 1 f 0. 1 f lo w ba tt er y ou tpu t c2 c4 c3 c1 l a i c 1 612 r6 r5 r4 r3 sh dn c l sel lx fb lb o gn d ref lb i ba tt ou t fig.35 v out = 5.0v application circuit. fig.36 an adjustable output application circuit 13
AIC1612 application examples (continued) fig.37 top layer fig.38 bottom layer fig.39 placement fb 1 lb i 2 lb o 3 c l sel 4 re f 5 s hdn 6 batt 7 gnd 8 l x 9 out 10 a i c1612 r1 200 r5 r2 100k r4 r6 r3 c3 0. 1 f c4 1 f + c5 6v /100 f + c1 6v / 100 f l1 22 h ju 3 ju 2 v out v in v out vin v in v out v in d1 i s opt i onal connec t t o out f o r 3. 3v out put vol t age connec t t o gnd f o r 5. 0v out put vol t age open f o r adj us t abl e out put vol t age; v out =1. 23(1+r5 / r 6) connec t t o out f o r 1. 0a l i m i t connec t t o gnd f o r 0. 8a l i m i t connec t t o gnd f o r s hut dow n connec t t o v out fo r n o r m a l ju 1 + c2 6v /100uf + c6 6v /100 f + c7 6v / 100 f l1: tdk s l f7045t-22om r 90 c1~c2, c5~7: ni p p o n tant al um capac i t or 6m cm 107m cte r fig.40 AIC1612 application circuit with small ripple voltage f i g. 41 eff i c i enc y ( r ef . to f i g . 40) ef f i cie n cy ( % ) o u t put cu r r ent (ma ) 0.0 1 0. 1 1 10 10 0 10 00 30 35 40 45 50 55 60 65 70 75 80 85 90 95 10 0 v ou t =5 .0v l= 22 h v in =1 .2v v in =2 .4v v in =3 .6v cls e l = o ut (i lim i t =1a) f i g. 42 rippl e v o lt age ( r ef . to f i g . 40) r i ppl e v o l t age ( m v) o u t put cu r r ent (ma ) 0 10 0 20 0 30 0 40 0 50 0 60 0 700 0 10 20 30 40 50 60 v ou t =5 .0v l= 2 2 h v in =2 .4 v v in =3 .6v v in =1 .2v cls e l =out ( i lim i t =1 a) 14
AIC1612 application examples (continued) f i g. 43 eff i c i e n c y (r ef . to f i g.40) ef f i cie n cy ( % ) o u t put cu r r ent (ma ) 60 0. 0 1 0. 1 1 1 0 10 0 100 0 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 v ou t =5 .0v l= 22 h v in =2 .4v v in =3 .6v v in =1 .2v cls e l = g nd (i lim i t =0.65a) f i g. 44 rippl e v o lt age ( r ef . to f i g . 40) r i ppl e v o l t age ( m v) o u t put cu r r ent (ma ) 0 10 0 20 0 30 0 40 0 50 0 0 10 20 30 40 50 60 v ou t =5 .0 v l=2 2 h v in =2 .4v v in =3 .6v v in =1 .2 v cls e l =gnd ( i lim i t = 0 .65 a ) f i g. 45 eff i c i e n c y (r ef . to f i g.40) ef f i cie n cy ( % ) o u t put cu r r ent (ma ) 0. 0 1 0. 1 1 10 10 0 100 0 40 45 50 55 60 65 70 75 80 85 90 95 10 0 v in =2 .4 v v in =1 .2 v v ou t =3 .3v l= 22 h cls e l =out ( i lim i t =1 a) f i g . 46 r i ppl e v o lt a ge (r e f . to f i g.40) r i ppl e v o l t age ( m v) o u t put cu r r ent (ma ) 0 50 10 0 15 0 20 0 25 0 30 0 35 0 40 0 45 0 50 0 55 0 60 0 0 5 10 15 20 25 30 35 40 45 50 v in =2 .4v v in =1 .2 v v ou t =3 .3v l= 22 h cls e l =out ( i lim i t =1 a) f i g. 47 eff i c i enc y ( r ef . to f i g.4 0 ) ef f i cie n cy ( % ) o u t put cu r r ent (ma ) 0.0 1 0. 1 1 10 10 0 10 00 40 45 50 55 60 65 70 75 80 85 90 95 10 0 v ou t =3 .3v l= 2 2 h v in =2 .4v v in =1 .2v cls e l = gnd (i li mi t =0.65a) fig. 48 ri pple v o l t age ( r ef . to f i g.40) r i ppl e v o l t age ( m v) o u t put cu r r ent (ma ) 0 50 10 0 15 0 20 0 25 0 30 0 35 0 40 0 0 5 10 15 20 25 30 35 v ou t =3 .3v l= 22 h v in =2 .4 v v in =1 .2v cls e l =gnd ( i lim i t = 0 .65 a ) 15
AIC1612 e l c e e1 d a2 b a1 0 . 50 b s c 0.40 0 0.70 6 4.9 0 bs c 0.13 2. 9 0 2. 9 0 0.75 0.15 0.05 0.23 3.10 3.10 0.95 0.30 0.15 s y m b o l a ms o p - 1 0 mi ll im et er s min . 1.10 ma x. a2 a 0. 2 5 s e cti on a- a bas e met a l ga ug e p l a n e wi th plati n g a1 b c d e a e1 e se e vi e w b a physical dimension (unit: mm) msop-10 note: note: information provided by aic is believed to be accurate and reliabl e. how e ver, w e cannot assume responsibility for use of any ci r- cuitry other than circuitry entirely embodi ed in an aic product; nor for any infringement of patents or other rights of third p arties that may result from its use. we reserve the right to change the circuitry and specific ations w i thout notice. information provided by aic is believed to be accurate and reliabl e. how e ver, w e cannot assume responsibility for use of any ci r- cuitry other than circuitry entirely embodi ed in an aic product; nor for any infringement of patents or other rights of third p arties that may result from its use. we reserve the right to change the circuitry and specific ations w i thout notice. life support policy : aic does not authorize any aic product for us e in life support devices and/or sy stems. life support device s or sy stems are devices or sy stems w h ich, (i) are intended for surgic al implant into the body or (ii) support or sustain life, and wh o s e failure to perform, w hen properly used in accordance w i th instru ctions for use provided in t he labeling, can be reasonably expe cted to result in a significant injury to the user. life support policy : aic does not authorize any aic product for us e in life support devices and/or sy stems. life support device s or sy stems are devices or sy stems w h ich, (i) are intended for surgic al implant into the body or (ii) support or sustain life, and wh o s e failure to perform, w hen properly used in accordance w i th instru ctions for use provided in t he labeling, can be reasonably expe cted to result in a significant injury to the user. 16

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