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1/14 may 2004 input voltage from 2.5v to 6v stable with low esr ceramic capacitors ultra low dropout voltage (100mv typ. at 150ma load, 0.4mv typ. at 1ma load) very low quiescent current (85a typ. at no load, 170a typ. at 150ma load; max 1.5a in off mode) guaranteed output current up to 150ma wide range of output voltage: 1.2v; 1.22v; 1.25v; 1.35v; 1.5v; 1.8v; 2v; 2.1v; 2.2v; 2.4v; 2.5v; 2.6v; 2.7v; 2.8v; 2.85v; 2.9v; 3v; 3.1v; 3.2v; 3.3v; 4.7v; 5v fast turn-on time: typ. 200s [c o =1f, c byp = 10nf and i o =1ma] logic-controlled electronic shutdown internal current and thermal limit output low noise voltage 30vrms over 10hz to 100khz s.v.r. of 60db at 1khz, 50db at 10khz temperature range: -40c to 125c description the ld3985 provides up to 150ma, from 2.5v to 6v input voltage. the ultra low drop-voltage, low quiescent current and low noise make it suitable for low power applications and in battery powered systems. regulator ground current increases only slightly in dropout, further prolonging the battery life. power supply rejection is better than 60 db at low frequencies and starts to roll off at 10khz. high power supply rejection is maintained down to low input voltage levels common to battery operated circuits. shutdown logic control function is available, this means that when the device is used as local regulator, it is possible to put a part of the board in standby, decreasing the total power consumption. the ld3985 is designed to work with low esr ceramic capacitors. typical applications are in mobile phone and similar battery powered wireless systems. ld3985 series ultra low drop-low noise bicmos voltage regulators low esr capacitors compatible schematic diagram flip-chip (1.57x1.22) tsot23-5l sot23-5l rev. 7
ld3985 series 2/14 table 1: absolute maximum ratings absolute maximum ratings are those values beyond which damage to the device may occur. functional operation under these condition is not implied. (*) the input pin is able to withstand non repetitive spike of 6.5v for 200ms. table 2: thermal data figure 1: connection diagram (top view for sot and tsot, top through view for flip-chip) table 3: pin description symbol parameter value unit v i dc input voltage -0.3 to 6 (*) v v o dc output voltage -0.3 to v i +0.3 v v inh inhibit input voltage -0.3 to v i +0.3 v i o output current internally limited p d power dissipation internally limited t stg storage temperature range -65 to 150 c t op operating junction temperature range -40 to 125 c symbol parameter sot23-5l/ tsot23-5l flip-chip unit r thj-case thermal resistance junction-case 81 c/w r thj-amb thermal resistance junction-ambient 255 170 c/w pin n sot23-5l/ tsot23-5l pin n flip-chip symbol name and function 14v i input voltage of the ldo 2 2 gnd common ground 31v inh inhibit input voltage: on mode when v inh 1.2v, off mode when v inh 0.4v (do not leave floating, not internally pulled down/up) 4 5 bypass bypass pin: connect an external capacitor (usually 10nf) to minimize noise voltage 53v o output voltage of the ldo tsot23-5l/sot23-5l flip-chip
ld3985 series 3/14 table 4: ordering codes (*) available on request. figure 2: typical application circuit sot23-5l tsot23-5l flip-chip output voltages ld3985m12 (*) ld3985g12 (*) ld3985j12 (*) 1.20 v ld3985m122 ld3985g122 (*) ld3985j122 1.22 v ld3985m125 (*) ld3985g125 (*) ld3985j125 1.25 v ld3985m135 (*) ld3985g135 (*) ld3985j135 1.35 v ld3985m15 ld3985g15 (*) ld3985j15 (*) 1.5 v ld3985m18 ld3985g18 ld3985j18 1.8 v ld3985m20 (*) ld3985g20 (*) ld3985j20 (*) 2.0 v ld3985m21 (*) ld3985g21 (*) ld3985j21 (*) 2.1 v ld3985m22 (*) ld3985g22 (*) ld3985j22 (*) 2.2 v ld3985m24 (*) LD3985G24 (*) ld3985j24 2.4 v ld3985m25 ld3985g25 ld3985j25 2.5 v ld3985m26 (*) ld3985g26 (*) ld3985j26 2.6 v ld3985m27 ld3985g27 ld3985j27 2.7 v ld3985m28 (*) ld3985g28 (*) ld3985j28 2.8 v ld3985m285 (*) ld3985g285 (*) ld3985j285 (*) 2.85 v ld3985m29 ld3985g29 ld3985j29 2.9 v ld3985m30 (*) ld3985g30 (*) ld3985j30 3.0 v ld3985m31 (*) ld3985g31 (*) ld3985j31 3.1 v ld3985m32 (*) ld3985g32 (*) ld3985j32 (*) 3.2 v ld3985m33 ld3985g33 (*) ld3985j33 3.3 v ld3985m44 (*) ld3985g44 (*) ld3985j44 (*) 4.4 v ld3985m47 ld3985g47 (*) ld3985j47 4.7 v ld3985m48 (*) ld3985g48 (*) ld3985j48 4.8 v ld3985m49 (*) ld3985g49 (*) ld3985j49 (*) 4.9 v ld3985m50 (*) ld3985g50 (*) ld3985j50 (*) 5.0 v
ld3985 series 4/14 table 5: electrical characteristics for ld3985 (t j = 25c, v i =v o(nom) +0.5v, c i =1 f, c byp = 10nf, i o =1ma,v inh = 1.4v, unless otherwise specified) symbol parameter test conditions min. typ. max. unit v i operating input voltage 2.5 6 v v o output voltage < 2.5v i o = 1 ma -50 50 mv t j = -40 to 125c -75 75 v o output voltage 2.5v i o =1ma -2 2 %of v o(nom) t j = -40 to 125c -3 3 ? v o line regulation (note 1) v i =v o(nom) + 0.5 to 6 vt j = -40 to 125c -0.1 0.1 %/v v o = 4.7 to 5v -0.19 0.19 ? v o load regulation i o = 1 ma to 150ma v o <2.5v t j = -40 to 125c 0.002 0.008 %/ma ? v o load regulation i o = 1 ma to 150ma v o 2.5v t j = -40 to 125c (for flip-chip) 0.0004 0.002 %/ma i o = 1 ma to 150ma, t j = -40 to 125c (for sot23-5l/tsot23-5l), v o 2.5v 0.0025 0.005 ? v o output ac line regulation v i =v o(nom) +1v,i o =150ma, t r =t f = 30s 1.5 mv pp i q quiescent current on mode: v inh =1.2v i o =0 85 a i o =0 t j = -40 to 125c 150 i o = 0 to 150ma 170 i o = 0 to 150ma t j = -40 to 125c 250 off mode: v inh = 0.4v 0.003 t j = -40 to 125c 1.5 v drop dropout voltage (note 1) i o =1ma 0.4 mv i o =1ma t j = -40 to 125c 2 i o =50ma 20 i o =50ma t j = -40 to 125c 35 i o =100ma 45 i o =100ma t j = -40 to 125c 70 i o =150ma 60 i o =150ma t j = -40 to 125c 100 i sc short circuit current r l = 0 600 ma svr supply voltage rejection v i =v o(nom) +0.25v v ripple =0.1v, i o = 50ma v o(nom) <2.5v, v i =2.55v f=1khz 60 db f=10khz 50 i o(pk) peak output current v o v o(nom) - 5% 300 550 ma v inh inhibit input logic low v i =2.5vto6v t j =-40to 125c 0.4 v inhibit input logic high 1.2 i inh inhibit input current v inh =0.4v v i =6v 1 na en output noise voltage b w =10hzto100khz c o =1 f30 v rms t on turn on time (note 4) c byp = 10 nf 200 s t shdn thermal shutdown note 5 160 c
ld3985 series 5/14 note1?forv o(nom) <2v,v i =2.5v note2?forv o(nom) =1.25v,v i =2.5v note3?dropoutvoltageistheinput-to-outputvoltagedifferenceatwhichtheoutputvoltageis100mvbelowitsnominalvalue.thisspeci- fication does not apply for input voltages below 2.5v. note 4 ? turn-on time is time measured between the enable input just exceeding v inh high value and the output voltage just reaching 95% of its nominal value note5?typicalthermalprotectionhysteresisis20c note 6 - the minimum capacitor value is 1f, anyway the ld3985 is still stable if the compensation capacitor has a 30% tolerance in all temperature range. typical performance characteristics (t j = 25c, v i =v o(nom) +0.5v, c i =c o =1 f, c byp =1 0 nf, i o =1ma,v inh = 1.4v, unless otherwise specified) figure 3: output voltage vs temperature figure 4: output voltage vs temperature figure 5: output voltage vs temperature figure 6: shutdown voltage vs temperature c o output capacitor capacitance (note 6) 1 22 f esr 5 5000 m ? symbol parameter test conditions min. typ. max. unit
ld3985 series 6/14 figure 7: shutdown voltage vs temperature figure 8: line regulation vs temperature figure 9: line regulation vs temperature figure 10: line regulation vs temperature figure 11: load regulation vs temperature figure 12: load regulation vs temperature
ld3985 series 7/14 figure 13: load regulation vs temperature figure 14: quiescent current vs temperature figure 15: quiescent current vs temperature figure 16: quiescent current vs temperature figure 17: supply voltage rejection vs frequency figure 18: load transient response v i =3.2v,i o = 1 to 150ma, rise-fall time = 1 sec
ld3985 series 8/14 figure 19: line transient response figure 20: start-up figure 21: turn-off v i =3.8vto4.4v,t j =25c,i o = 150ma, c i =c o =1 f(x7r), c byp = 10nf, rise-fall time = 1 sec, v o =2.7v v i =3.3v,i o =1ma,c i =c o =1 f (cer), c byp = 10nf, t r = 20ns, v o =2.8v v i =3.3v,i o =1ma,c i =c o =1 f (cer), c byp = 10nf, t f =20ns, v o =2.8v
ld3985 series 9/14 dim. mm. mils min. typ max. min. typ. max. a 0.90 1.45 35.4 57.1 a1 0.00 0.10 0.0 3.9 a2 0.90 1.30 35.4 51.2 b 0.35 0.50 13.7 19.7 c 0.09 0.20 3.5 7.8 d 2.80 3.00 110.2 118.1 e 1.50 1.75 59.0 68.8 e0.95 37.4 h 2.60 3.00 102.3 118.1 l 0.10 0.60 3.9 23.6 sot23-5l mechanical data 7049676c .
ld3985 series 10/14 dim. mm. mils min. typ max. min. typ. max. a 1.1 43.3 a1 0 0.1 3.9 a2 0.7 1.0 27.6 39.4 b 0.3 0.5 11.8 19.7 c 0.08 0.2 3.1 7.9 d 2.9 114.2 e 2.8 110.2 e1 1.6 63.0 e0.95 37.4 e1 1.9 74.8 l 0.3 0.6 11.8 23.6 tsot23-5l mechanical data 7282780/a
ld3985 series 11/14 dim. mm. mils min. typ max. min. typ. max. a 0.835 0.9 0.965 32.874 35.433 37.992 a1 0.21 0.25 0.29 8.268 9.843 11.417 a2 0.625 0.65 0.675 24.606 25.591 26.575 b 0.265 0.315 0.365 10.433 12.402 14.370 d 1.510 1.540 1.570 59.449 60.630 61.811 e 1.16 1.19 1.22 45.669 46.850 48.031 e 0.45 0.5 0.55 17.717 19.685 21.654 e1 0.816 0.866 0.916 32.126 34.094 36.063 f 0.345 13.583 f1 0.337 13.268 flip-chip5 mechanical data
ld3985 series 12/14 dim. mm. inch min. typ max. min. typ. max. a 180 7.086 c 12.8 13.0 13.2 0.504 0.512 0.519 d 20.2 0.795 n 60 2.362 t 14.4 0.567 ao 3.13 3.23 3.33 0.123 0.127 0.131 bo 3.07 3.17 3.27 0.120 0.124 0.128 ko 1.27 1.37 1.47 0.050 0.054 0.0.58 po 3.9 4.0 4.1 0.153 0.157 0.161 p 3.9 4.0 4.1 0.153 0.157 0.161 tape & reel sot23-xl mechanical data
ld3985 series 13/14 table 6: revision history date revision description of changes 07-may-2004 7 part number status changed on table 4 - page 3.
ld3985 series 14/14 information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result f rom its use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specificati ons mentioned in this publication are subject to change without notice. this publication supersedes and replaces all information previously supplied. stmicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of stmicroelectronics. the st logo is a registered trademark of stmicroelectronics all other names are the property of their respective owners ? 2004 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - singapore - spain - sweden - switzerland - united kingdom - united states. http://www.st.com

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