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1 features ultralownoiseforrfapplication ultrafast response in line/load transient <0.01 m a standby current when shutdown. lowdropout:210mv@300ma wide operating voltage ranges:2v to 6v ttllogiccontrolledshutdowninput lowtemperaturecoefficient currentlimitingprotection thermalshutdownprotection only 1 m f output capacitor required for stability highpowersupplyrejectionratio customvoltageavailable fastoutputdischarge available in 5lead sot23 and sc70 package applications cellularandsmartphones batterypoweredequipment laptop,palmtops,notebookcomputers handheldinstruments pcmciacards mp3/mp4/mp5players portableinformationappliances description theLR9198isdesignedforportablerfand wireless applications with demanding perfor manceandspacerequirements.theLR9198 performanceisoptimizedforbatterypowered systems to deliver ultra low noise and low quiescent current. regulator ground current increases only slightly in dropout, further prolonging the battery life. the LR9198 also works with lowesr ceramic capacitors, reducing the amount of board space necessary for power applications, critical in handhe ld wireless devices. the LR9198 consumes less than 0.01a in shutdown mode and has fast turnon time less than 50s. the other features include ultra low dropout voltage, high output accuracy, current limiting protection, and high ripple rejection ratio. available in the 5lead sc70 andsot23packages. ordering information LR9198 xx x x x xxx typical application LR919828aa cin cout vin vout LR9198 vin 1 gnd 2 en 3 nc 4 vout 5 chipenable application hints: outputcapacitor(cout 2.2uf)is recommendedinLR91981.2vapplicationto assurethestabilityofcircuit. package: rn:sot235 urn:sc705 features p:standard(default,leadfree) c:customized enableoption: a:activehighwithinternal8mpulldown b:activelowwithinternal8mpullup outputvoltageaccuracy a:1% b:2% outputvoltage: 12:1.2v15:1.5v18:1.8v25:2.5v 28:2.8v30:3.0v33:3.3v50:5.0v ct:customfixedoutput(50mvstep) leshan radio company, ltd. LR9198 300ma ultra - low noise, ultra - fast cmos ldo regulator
2 absolute maximum rating (note 1) i nputsupplyvoltage(v in ) 0.3vto+6v eninputvoltage 0.3vto+v in outputvoltage 0.3vtov in +0.3v outputcurrent 300ma maximumjunctiontemperature12 5c operatingtemperaturerange (note2) 40cto85c storagetemperaturerange 65cto125c leadtemperature(soldering,10s) 300c package information thermal resistance (note 4) package ? ja ? jc sot235 250 c/w 130c/w sc705 333 c/w 170c/w note 1: absolutemaximumratingsarethosevaluesbeyondwh ichthelifeofadevicemaybeimpaired. note 2: theLR9198isguaranteedtomeetperformancespecif icationsfrom0cto70c.specificationsoverthe C40c to85coperatingtemperaturerangeareassuredby design,characterizationandcorrelationwithstati stical processcontrols. note 3: x:productcode(LR9198:e)v:voltagecode(1.2v:a,1. 5v:b,1.8v:c,2.5v:d,2.8v:e,3.0v:f,3.3v:g,5.0v:i)y: yearofmanufacturing(9:2009)w:weekofmanufactur ing(w:az,az). note 4: thermalresistanceisspecifiedwithapproximately 1squareof1ozcopper. 1 2 3 5 4 sot sot sot sot23 2323 23- -- -5 55 5/ // /sc scsc sc70 7070 70- -- -5 55 5 top view top view top view top view vin gnd en vout marking nc partnumber topmark temprange LR919812 eayw (note3) 40cto+85c LR919815 ebyw 40cto+85c LR919818 ecyw 40cto+85c LR919825 edyw 40cto+85c LR919828 eeyw 40cto+85c LR919830 efyw 40cto+85c LR919833 egyw 40cto+85c LR919850 eiyw 40cto+85c leshan radio company, ltd.
3 pin description pin name function 1 vin powerinputvoltage. 2 gnd ground. 3 en chipenablepinwithtwooptions. a:activehighwithinternal8mpulldown b:activelowwithinternal8mpullup 4 nc noconnection. 5 vout outputvoltage. block diagram LR9198xxxa LR9198xxxb leshan radio company, ltd.
4 electrical characteristics (note 5) (v in =3.6v,en=v in, c in =c out =1 m f,t a =25 ,unlessotherwisenoted.) parameter symbol conditions min typ max unit inputvoltage v in 2 6 v 1 +1 outputvoltageaccuracy (note 6) d v out v in= 3.6v, i out =1ma 2 +2 % currentlimit i lim r load =1 w 400 430 ma quiescentcurrent i q v en >1.2v,i out =0ma 90 130 m a i out =200ma, v out =2.8v 130 180 dropoutvoltage v drop i out =300ma, v out =2.8v 210 300 mv lineregulation (note 7) v line v in =3.6vto5.5v i out =1ma 0.05 0.17 %/v loadregulation (note 8) v load 1ma 5 typical performance characteristics 50 25 0 25 50 75 100 125 2.5 2.6 2.7 2.8 2.9 3.0 outputvoltage(v) temperaute( c ) output voltage vs. temperature v in =3.6v c in =c out =1uf 50 25 0 25 50 75 100 125 60 70 80 90 100 110 120 130 140 quiescentcurrent(ua) temperature( c) quiescent current vs. temperature v in =3.6v c in =c out =1uf 0 50 100 150 200 250 300 0 50 100 150 200 250 300 dropoutvoltage(mv) loadcurrent(ma) tj=85 c tj=25 c tj=40 c c in =c out =1uf dropout voltage vs. load current 10 100 1000 10000 100000 90 80 70 60 50 40 30 20 10 0 psrr(db) frequency(hz) i load =1ma i load =100ma i load =200ma v in =4.2v c in =1uf,c out =1uf,x7r psrr 50 25 0 25 50 75 100 125 0.75 0.80 0.85 0.90 0.95 1.00 1.05 temperature( c) enpinshutdownthreshold(v) en pin shutdown threshold vs. temperature v in =3.6v c in =c out =1uf 3.0 3.5 4.0 4.5 5.0 5.5 6.0 300 320 340 360 380 400 420 440 460 480 500 currentlimit(ma) inputvoltage(v) c in =c out =1uf v out =2.8v current limit vs. input voltage leshan radio company, ltd.
6 leshan radio company, ltd.
7 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3.0 outputvoltage(v) inputvoltage(v) iload=1ma iload=100ma iload=300ma v out vs.v in c in =c out =1uf leshan radio company, ltd.
8 applications information like any lowdropout regulator, the ex ternal capacitors used with the LR9198 must be carefully selected for regulator stability and performance. using a capac itor whose value is > 1f on the LR9198 input and the amount of capacitance can be increased without limit. the input cap acitor must be located a distance of not morethan0.5inchfromtheinputpinofthe ic and returned toa cleananalog ground. any good quality ceramic or tantalum can be used for this capacitor. the capacitor with larger value and lower esr (equi valent series resistance) provides better psrr and linetransient response. the output capacitor must meet both requi rements for minimum amount of capa citance and esr in all ldos application. the LR9198 is designed specifically to work with low esr ceramic output capa citor in spacesaving and performance consideration. using a ceramic capacitor whose value is at least 1f with esr is > 25m on the LR9198 output ensures stability. the LR9198 still works well with output capacitor of other types due to the widestableesrrange.outputcapacitorof larger capacitance can reduce noise and improve load transient response, stability, andpsrr.theoutputcapacitorshouldbe located not more than 0.5 inch from the v out pin of the bl9198 and returned to a cleananalogground. enable function theLR9198featuresanldoregulatoren able/disable function. to assure the ldo regulator will switch on; the en turn on controllevelmustbegreaterthan1.2volts. the ldo regulator will go into the shut down mode when the voltage on the en pinfallsbelow0.4volts.fortoprotectthe system, the LR9198 have a quick dis charge function. if the enable function is notneededinaspecificapplication,itmay betiedtov in tokeeptheldoregulatorin acontinuouslyonstate. thermal considerations thermalprotectionlimitspowerdissipation in LR9198. when the operation junction temperature exceeds 165c, the otp circuitstartsthethermalshutdownfunction turn the pass element off. the pass element turns on again after the junction temperaturecoolsby30c. for continue operation, do not exceed absolute maximum operation junction temperature 125c. the power dissipation definitionindeviceis: p d =(v in ?v out )i out +v in i q the maximum power dissipation depends on the thermal resistance of ic package, pcb layout, the rate of surroundings airflow and temperature difference betw een junction to ambient. the maximum power dissipation can be calculated by followingformula p d (max)=(t j (max)?t a )/ ja wheret j (max)isthemaximumoperation junction temperature 125c, t a is the ambient temperature and the ja is the junctiontoambientthermalresistance.for recommended operating conditions spe cificationofLR9198,wheret j (max)isthe maximum junction temperature of the die (125c) and t a is the maximum ambient temperature. the junction to ambient the rmal resistance ( ja is layout dependent) leshan radio company, ltd.
9 forsot235packageis250c/w,sc70 5 package is 333c/w, on standard jedec513thermaltestboard.themax imum power dissipation at t a = 25c can becalculatedbyfollowingformula: p d (max) = (125c?25c)/333 = 300mw (sc705) p d (max) = (125c?25c)/250 = 400mw (sot235) the maximum power dissipation depends onoperatingambienttemperatureforfixed t j (max) and thermal resistance ja . it is also useful to calculate the junction of temperature of the bl9198 under a set of specific conditions. in this example let the input voltage v in =3.3v, the output current io=300ma and the case temperature t a =40c measured by a thermal couple duringoperation.thepowerdissipationfor the v out =2.8v version of the bl9198 can becalculatedas: p d =(3.3v?2.8v)300ma+3.6v100ua =150mw and the junction temperature, t j , can be calculatedasfollows: t j =t a +p d ja =40c+0.15w250c/w =40c+37.5c=77.5cLR9198inthisconfiguration. layout considerations toimproveacperformancesuchaspsrr, output noise, and transient response, it is recommended that the pcb be designed with separate ground planes for v in and v out , with each ground plane connected onlyatthegndpinofthedevice. leshan radio company, ltd.
10 LR91982.8vlayoutcircuit c4 c3 vin vout LR9198 vin 1 gnd 2 en 3 nc 4 vout 5 jp 1 1 2 2 3 3 c1 vin vin toplayerlayout bottomlayerlayout leshan radio company, ltd.
11 package description dimensions in millimeters dimensions in inches symbol min max min max a 0.800 1.100 0.031 0.044 a1 0.000 0.100 0.000 0.004 b 1.150 1.350 0.045 0.054 b 0.150 0.400 0.006 0.016 c 1.800 2.450 0.071 0.096 d 1.800 2.250 0.071 0.089 e 0.650 0.026 h 0.080 0.260 0.003 0.010 l 0.210 0.460 0.008 0.018 sc705surfacemountpackage leshan radio company, ltd.
12 dimensions in millimeters dimensions in inches symbol min max min max a 0.889 1.295 0.035 0.051 a1 0.000 0.152 0.000 0.006 b 1.397 1.803 0.055 0.071 b 0.356 0.559 0.014 0.022 c 2.591 2.997 0.102 0.118 d 2.692 3.099 0.106 0.122 e 0.838 1.041 0.033 0.041 h 0.080 0.254 0.003 0.010 l 0.300 0.610 0.012 0.024 sot235surfacemountpackage leshan radio company, ltd.

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