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low noise, fast response 500ma ldo regulato r lr8558 general description lr8558 series is a group of positive voltage output, low power consumption, low dropout voltage regulator. lr8558 can provide output value in the range of 1.2v~4.5v every 0.1v step. it also can be customized on command. lr8558 includes high accuracy voltage reference, error amplifier, current limit circuit and output driver module with discharge capability. lr8558 has excellent load and line transient response and good temperature characteristics, which can assure the stability of chip and power system. and it uses trimming technique to guarantee output voltage accuracy within 2%. lr8558 is available in sot-23-5, sc-82 packages which is lead free. it also can available in these packages with lead. features ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? low power consumption: 75ua typ. low output noise (47uvrms) standby mode: 0.1ua low dropout voltage: 0.46v@500ma (typ.) high ripple rejection: 66db@100hz (typ.) low temperature coefficient: 100ppm/ c excellent line regulation: 0.05%/v build-in chip enable and discharge circuit output voltage range: 1.2v~4.5v (customized on command every 0.1v step) highly accurate: 2% (1% customized) output current limit applications power source for cellular phones and various kind of pcss battery powered equipment power management of mp3, pda, dsc, mouse, ps2 games reference voltage source regulation after switching power l 5 8558-2.8v output 2 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 0 200 400 600 iload(ma) vout(v) l8558 ty pical performance characteristics lr8558 typical application circuit l58558 leshan radio co ., ltd 1/11
pin assignment lr8558-xxpsa lr8558-xxpsb lr8558-xxprm lr8558-xxprn lr8558-xxpt selection guide lr8558 - xx x x output voltage 121.2v 151.5v 282.8v 303.0v 353.5v 454.5v features pstandard defualt lead free c customized package type sa sot-89-3 sb sot-89-3 rm sot-23-3 rn sot-23-5 t to-92 leshan radio co ., ltd 2/11
pin description pin number sot-89-3 (a) sot-89-3 (b) sot-23-5 sot-23-3 to-92 symbol function 1 3 5 2 3 vout output pin 3 2 1 3 1 vin input pin 2 1 2 1 2 vss ground pin 3 ce chip enable pin 4 nc no connection product classification output voltage package type product name package type product name package type product name 1.2v sot-89-3a lr8558-12psa sot-89-3b lr8558-12psb sot-23-5 lr8558-12prn 1.5v sot-89-3a lr8558-15psa sot-89-3b lr8558-15psb sot-23-5 lr8558-15prn 1.8v sot-89-3a lr8558-18psa sot-89-3b lr8558-18psb sot-23-5 lr8558-18prn 2.1v sot-89-3a lr8558-21psa sot-89-3b lr8558-21psb sot-23-5 lr8558-21prn 2.5v sot-89-3a lr8558-25psa sot-89-3b lr8558-25psb sot-23-5 lr8558-25prn 2.8v sot-89-3a lr8558-28psa sot-89-3b lr8558-28psb sot-23-5 lr8558-28prn 3.0v sot-89-3a lr8558-30psa sot-89-3b lr8558-30psb sot-23-5 lr8558-30prn 3.2v sot-89-3a lr8558-32psa sot-89-3b lr8558-32psb sot-23-5 lr8558-32prn 3.3v sot-89-3a lr8558-33psa sot-89-3b lr8558-33psb sot-23-5 lr8558-33prn 3.5v sot-89-3a lr8558-35psa sot-89-3b lr8558-35psb sot-23-5 lr8558-35prn 4.5v sot-89-3a lr8558-45psa sot-89-3b lr8558-45psb sot-23-5 lr8558-45prn output voltage package type product name package type product name 1.2v sot-23-3 lr8558-12prm to-92 lr8558-12pt 1.5v sot-23-3 lr8558-15prm to-92 lr8558-15pt 1.8v sot-23-3 lr8558-18prm to-92 lr8558-18pt 2.1v sot-23-3 lr8558-21prm to-92 lr8558-21pt 2.5v sot-23-3 lr8558-25prm to-92 lr8558-25pt 2.8v sot-23-3 lr8558-28prm to-92 lr8558-28pt 3.0v sot-23-3 lr8558-30prm to-92 3.2v sot-23-3 LR8558-32PRM to-92 3.3v sot-23-3 lr8558-33prm to-92 3.5v sot-23-3 lr8558-35prm to-92 4.5v sot-23-3 l 5 8558-45prm to-92 lr8558-30pt lr8558-32pt lr8558-33pt lr8558-45pt lr8558-35pt leshan radio co ., ltd 3/11
product marking information: sot23-5 sot-23-3 to-92 sot-89-3 ( b ) sot-89-3 ( a ) 1 output voltage 2. lot no. lr8558 leshan radio co ., ltd 4/11
block diagram absolute maximum ratings max input voltage------------------------------------------------------------------------------------10v junction temperature (t j ) ------------------------------------------------------------------------125 c output current --------------------------------------------------------------------------------------- 500ma power dissipation sot-23-5 -------------------------------------------------------------------------------------------250mw sot-23-3 -------------------------------------------------------------------------------------------200mw sot-89-3 -------------------------------------------------------------------------------------------500mw to-92 ------------------------------------------------------------------------------------------------350mw storage temperature (ts)--------------------------------------------------------------------------45 c 150c recommended work conditions item min recommended max unit input voltage range 8 v ambient temperature -40 85 c electrical characteristics test conditions: cin=1uf,cout=3.4uf,ta=25 c, unless otherwise specified. lr 8558, for arbitrary output voltage symbol parameter conditions min typ max units vin input voltage 8 v vout output voltage vin=set vout+1v 1ma iout 30ma vout x0.98 vout1 vout x1.02 v iout (max.) maximun output current vin-vout=1v 500 ma ge leshan radio co ., ltd 5/11
iout=100ma 88 120 mv iout=300ma 270 350 mv vdrop 1 dropout voltage,vout 2.8v iout=500ma 460 600 mv voutvin vout ?? ? line regulation iout=40ma 2.8v vin 8v 0.05 0.2 %/v vout ? / iout ? load regulation vin=set vout+1v 1ma iout 500ma 20 40 mv iss supply current vin=set vout+1v 75 90 ua istandby supply current (srandby) vin=set vout+1v vce=gnd 0.1 1.0 ua voutt vout ?? ? output voltage temperature coefficiency iout=30ma 100 ppm/ c psrr ripple rejection f=100hz, ripple=0.5vp-p vin=set vout+1v 65 db ilim short current limit vout=0v 200 ma rpd ce pull down resistance 2.0 5.0 10.0 m ? vceh ce input voltage ?h? 1.5 vin v vcel ce input voltage ?l? 0 0.25 v en output noise bw=10hz~100khz 47 uvrms 1. vdrop=vin1-(vout2*0.98) vout2 is the output voltage when vin=vout1+1.0v and iout=300ma or iout=500ma. vin1 is the input voltage at which the output voltage bec omes 98% of vout1 after gr adually decreasing the input voltage. application hints note1: input capacitor (cin=1uf) is recommended in all application circuit. note2: output capacitor (cout=3.3uf/4.7uf) is recommended in all application to assure the stability of circuit. typical application circuit explanation lr8558 series is a group of positive voltage output, low noise, low power consumption, low dropout voltage regulator. lr8558 can provide output value in the range of 1.2v~4.5v every 0.1v step. it also can be customized on command. lr8558 includes high accuracy voltage reference, error amplifier, current limit circuit and output driver module. lr8558 has excellent load and line transient response and good temperature characteristics, which can assure the stability of chip and power system. and it uses trimming technique to guarantee output voltage accuracy within 2%. lr8558 leshan radio co ., ltd 6/11
typical performance characteristics 1) output voltage vs. output current (with output short protection) 2) output voltage vs. input voltage 0 0.5 1 1.5 2 2.5 3 0 200 400 600 800 1000 1200 iload(ma) vout(v) vin=3.3v vin=3.8v vin=4.8v 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 0246810 vin(v) vout(v) iload=0 iload=28ma 3) dropout voltage vs. output current 4) ripple rejection vs. frequency 0 10 20 30 40 50 60 70 80 90 0.01 0.1 1 10 100 freq(khz) psrr ( db ) 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0 100 200 300 400 500 600 iload(ma) dropout(v) vout=2.8v vout=1.8v leshan radio co ., ltd 7/11
5) line transient response iout=1ma cout=1uf iout=50ma cout=1uf 6) load transient response vin=4.6v cout=1uf vin=4.6v cout=4.7uf vin=5.8v cout=1uf vin=5.8v cout=1uf 5v input voltage 4v 5v input voltage 4v output voltage output voltage output voltage output voltage 50ma 50ma output current output current 1ma 1ma 60ma 250ma output current output current 1ma 1ma output voltage output voltage leshan radio co ., ltd 8/11
7) startup response 8) shutdown response en voltage en volta g e output volta ge output volta ge leshan radio co ., ltd 9/11
package information: sot-23-5: package specification sot-89-3: package dimension: leshan radio co ., ltd 10/11 unit: mm unit: mm
sot-23-3: package dimension leshan radio co ., ltd 11/11 unit: mm

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