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AIC1532 500ma dual linear regulator with v aux driver features continuous 3.3v output from three inputs. complete power management solution. v cc , v sby regulator supplies 500ma output. built-in hysteresis when selecting input supplies. drive control signal for external v aux switc h . output can be forced higher than input (off-state). applications desktop computers. pci adapter cards with wake-on-lan. network interfac e cards (nics ) . multi power system. system with standby capabilities. description AIC1532 is a dual input regulator with v aux drive control capable of delivering 3.3v/500ma continuously. the output power is provided from three independent input voltage sources on a prioritized basis. power is always taken in priority using the following order v cc , v sby , and v aux . AIC1532 meets intel?s ? instantly available ? power requirements which follows the ?advanced configuration and power interface? (acpi) standards. when either v cc or v sby is present, the device automatically enables the regulator and produces a stable 3.3v output v out . when only v aux (3.3v) is present, the drive control output will turn-on an external pmos switch from an auxiliary 3.3v supply v aux to v out . the ic also prevents excessive current from flowing v out to either input voltage or ground when the output voltage is bigger than the input voltage. all the necessary control circuitry needed to provide a smooth and automatic transition between all the three supplies has been incorporated. this allows both v cc and v sby to be dynamically switched without loss of output voltage. a n alog integrations corporation si-soft research center ds-1532p-02 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
AIC1532 ? typical application circuit vsby 1 vcc 2 vo ut 3 dri ve 4 gn d 5 gn d 6 gn d 7 gn d 8 a i c 1532 + c3 10 f + c1 10 f + c2 10 f vsby _ 5 v v c c _5v 3.3v /500m a v a u x _3.3 v dual input regulator w i th auxiliary driv er ? ordering information ex am ple: aic1 532c st r ? in so - 8 p a c k age & t apin g & re el pac k ing t y pe ( cn is not a v ai la ble in t ape & r e e l pac k i ng t y p e .) aic1 532 pst r ? in so - 8 le ad f r e e p a c k age & t api ng & re el pac k ing t y pe pac king t y p e t r : t ape & r e e l tb : tu b e pac k a g i ng t ype n: pl a s t i c dip s: sm all o u t l in e c: comm erci al p: l e a d f r e e co mm er cial a i c 15 3 2 xxxx pin configu r at ion di p - 8 ( cn&pn) so - 8 ( c s&ps) to p vi e w gnd gnd gnd gnd vo ut vcc dri ve vsby 1 3 4 2 8 6 5 7 2
AIC1532 ? absolute maximum ratings v cc , v sby input voltage 7.0v v aux input voltage 4.0v v out output voltage 5.0v operating temperature range -40 c ~ 85 c junction temperature 125 c storage temperature range -65 c ~ 150 c lead temperature (soldering, 10sec.) 260 c absolute maximum ratings are those v a lues bey ond w h ich the life of a dev i ce may be impaired. ? test circuit refer to typical application circuit 3
AIC1532 ? electrical characteristics (v in = 5v, t a =25 c, unless otherw i se specified.) (note 1) p a r a m e t e r s c o n d i t i o n s m i n . t y p . max. u n i t regulated output voltage 0ma < i load < 500ma 3.135 3 . 3 0 0 3 . 4 6 5 v regulated output current 5 0 0 m a output voltage load regulation v cc select ed i load =50ma ~ 500ma v sby select ed i load =50ma ~ 500ma 2 0 20 mv output voltage line regulation v cc =4.5v~5.5v, i load =5ma v sby =4.5v~5.5v, i load =5ma 2 mv vcc select voltage vcc deselect voltage v sby > v sby des or v aux present v cc < v ccdes 3.90 4.50 4.20 4.60 v v sby select voltage v sby deselect voltage v aux present v sby < v sby des 3.90 4.50 4.20 4.60 v hysteresis voltage 0 . 3 0 v short circuit current v cc/sby =5v , v out = 0 v 1 0 0 0 ma v cc pin reverse leakage v sby pin reverse leakage v cc = 0v , v sby = 5v v cc = 5v , v sby = 0v 5 5 50 50 a ground current v cc/sby =5v , i load = 0ma v cc/sby =5v , i load = 500ma 1 0 0 100 500 500 a short circuit current v cc/sby =5v , v out =0v 1 0 0 0 m a v drive high voltage v cc or v sby select ed 3 . 7 5 4 . 0 0 v drive delay driv e high delay drive low delay 5.0 0.5 s drive pin current limit v drive =1v , v cc =5v 0 . 5 6 . 0 2 5 . 0 m a thermal shutdown hysteresis guaranteed by design 1 0 o c note 1 : specifications are production tested at ta = 25 c. specifications over the -40 c to 85 c operating temperature range are assured by design, characte rization and correlation with statistical quality controls (sqc). 4
AIC1532 typical performance characteristics fi g. 1 v cc cold s t ar t dr ive v cc v ou t 5 00m a fig. 2 v cc full po wer d o wn dr ive v cc v ou t 500m a fig. 3 v sb y cold s t ar t dr ive v sb y v ou t 5 00m a fi g. 4 v sb y fu ll p o wer down dr ive v sb y v ou t 500 m a fig. 5 v cc powe r - up dr ive v cc v ou t 375 m a fig. 6 v cc p o wer- down dr ive v cc v ou t 3 75m a 5
AIC1532 ? typical performance characteristics (continued) fig. 7 v cc lo ad t r an si en t r i sing 5m a 50 0m a i ou t : v ou t fig. 8 v cc lo ad t r an si en t f a l lin g 50 0m a 5m a i ou t : v out fi g . 9 v cc li ne t r ansi e n t ri s i ng 4. 5 v 5. 5 v v cc : v out 5 m a l oadi ng fig . 10 v cc lin e t r a n sien t fa llin g 5. 5 v 4. 5 v v cc : v ou t 5 m a l oadi n g fi g. 1 1 v cc lin e re gu la tio n 3. 0 3 . 5 4. 0 4 . 5 5 . 0 3. 05 3. 10 3. 15 3. 20 3. 25 3. 30 3. 35 3. 40 v ou t (v ) v cc (v ) 10 0m a 50 0ma 60 0 load c u rrent fi g. 12 v cc lo ad r e g u l a tio n 0 200 80 0 3. 24 3. 26 3. 28 3. 30 3. 32 3. 34 3. 36 3. 38 3. 40 400 v ou t (v ) load current (ma) 6
AIC1532 ? typical performance characteristics (continued) - 4 0 - 2 0 0 2 04 06 0 8 0 3. 2 4 3. 2 6 3. 2 8 3. 3 0 fig . 13 o u tp ut v o ltag e vs. t e m peratu r e t e m p er at u r e ( c) v ou t (v) ? block diagram ? pin description pin 1: vsby - standby supply voltage (5v) input for 3.3v regulator when vcc falls below v ccdes . some nics that operate in ? wake-on-lan? mode get a 5v standby through a cable that connects directly to a specific header on the motherboard. pin 2: vcc - primary supply voltage (5v) input for 3.3v regulator. pin 3: vout - 3.3v regulated output voltage when either v cc or v sby is present. when only v aux (3.3v) is present, v out voltage comes from v aux through an internal low impedance switch. pin 4: drive - signal for controlling external auxiliary switch. active low when internal regulator is disabled . pin 5-8: gnd - negative reference for all voltages. 7
AIC1532 8 ? applications information the requirement for external capacitors the selection of the output cap a citor is based on two requirement s: ldo compensation and the transition between power sources. during the t a keover between sources, the output cap a citor provides the loading. t herefore a larger output cap a citor can improve the transition. and since the output cap a citor plays t he import ant role in the compensation of ldo, a 10 f t ant alum cap a citor or larger is recommended. the input cap a citor is required to be as close to the ic as possible. the input cap a citor can reduce the p a rasitic ef fect formed by the power supply output impedance or the trace. a 10 f t ant alum cap a citor is a good choice. additional ceramic cap a citor can be placed close to input and output to reduce the high frequency noise. a 0.1 f is recommended. the lay out and thermal considerations the AIC1532 is housed in a thermally enhanced p a ckage where the gnd pins (pin5 to pin8) are integrated to the leadframe. generally , heat sinks are not available for most surface- mounted devices. instead, they rely on the printed-circuit board to provide the thermal p a th. when the AIC1532 operates normally , the maximum power dissip a tion is 0.85w 0.5 3.3) (5 i ) v (v p out out in d = ? = ? = at the maximum operation temperature, the thermal resist ance seen by the device, or the combination of all the thermal p a ths, should be c/w 94 0.85 85 165 r ja = ? ? . when the device is mounted on a double-sided printed circuit board, the ground plane is the most used thermal p a th. t o make sure the thermal resist ance small enough and the shut down function work normally , the thermal resist ance between gnd pins to gnd plane should be as small as possible by means of adding more vias. and the gnd plane should be at least 1 square centimeters of copper . the layout of AIC1532 is shown in fig.14. in fig. 21, the thermal resist ance r ja is 70.36 c/w where the AIC1532 is mounted on the double-sided pcb and measured under forced-air thermal chamber . fig.14 the layout of AIC1532
AIC1532 9 p o we r di s s i p a t i o n ( w ) a m bi en t t e m pera t ure ( q c) 0 20 40 60 80 100 0. 8 1. 0 1. 2 1. 4 1. 6 1. 8 2. 0 2. 2 2. 4 2. 6 fig.15 the thermal shutdown power dissipat ion vs. ambient temperature where r ja is 70.36 q c/w in the forced-air thermal chamber applications circuit l1 22 p h r1 22 r2 27 k vi n d1 ss 1 2 u sb_ 5 v + c5 47 p f vout _3 .3v c2 1 p f + c1 22 p f il im / s d 1 vi n 2 sw 3 sg n d 4 cg nd 5 lb o 6 lb i 7 vo u t 8 u1 a i c163 1 + c3 220 p f + c4 10 p f vsby 1 vc c 2 vo u t 3 driv e 4 gnd 5 gnd 6 gnd 7 gnd 8 u2 ai c 1 5 3 2 q1 s i 23 01 fig. 16 the step up converter with or function for dual power system us b_5v + c5 22 p f v ou t _3.3v vsby 1 vc c 2 vo u t 3 dr iv e 4 gn d 5 gn d 6 gn d 7 gn d 8 u2 a i c 1532 + c4 10 p f vou t 1 gnd 2 sh dn 3 ca p 4 vi n 5 ca p 6 u1 a i c 1845 c2 1 p f v in 2. 7~5. 5v c1 10 p f c3 10 p f fig. 17 the step up/down converter with or function for dual power system
AIC1532 10 h l d e h e c b a1 0.5 0 0. 25 0. 40 0 1. 27 8 1.2 7 bs c 4. 80 5. 80 3. 80 0. 33 0. 19 0. 10 5.0 0 6. 20 4. 00 0.5 1 0.2 5 0.2 5 s y m b o l a sop-8 mill imet ers 1. 35 mi n . 1. 75 max. a 0.25 bas e m etal wi th pla t ing a1 b c d e aa h e h x 45 s e e view b l vi ew b se at i n g pl an e g aug e p l an e ? g auge plane physical dimensions (unit: mm) z 8 lead plastic so z 8 lead plastic dip 0. 38 a a1 a2 l d1 a b2 a e eb ea e1 d e c with plating se ct ion a - a base m e tal b 2 . 54 bsc e l eb ea 2. 92 7 . 62 bsc 3. 8 1 10 .92 d 9. 01 e e1 d1 7. 62 6. 1 0 0. 13 c b2 b 0. 20 1. 1 4 0. 36 10 .16 8. 26 7. 1 1 0. 3 5 1.7 8 0. 5 6 mi ll imet ers min. s y m b o l a1 a2 a 0. 38 2. 92 max. 4. 95 5. 3 3 di p- 8
AIC1532 11 note: information provided by aic is believed to be accurate and reliabl e. however, we cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an aic product; nor for any infringement of patents or other rights of thir d parties that may result from its use. we reserve the right to change the circuitry and specif ications without notice. life support policy: aic does not authorize any aic product for us e in life support devices and/or systems. life support device s or systems are devices or systems which, (i) are intended for surgic al implant into the body or (ii) support or sustain life, and whose failure to perform, when properly used in accordance with instru ctions for use provided in the labeling, can be reasonably expe cted to result in a significant injury to the user.

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