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1/14 september 2001 n typical dropout 1.3v (at 3a) n three terminal adjustable or fixed output voltage 1.8v, 2.5v, 2.85v, 3.3v, 3.6v, 5v, 8v, 9v, 12v. n guaranteed output current up to 3a n ouput tolerance 2% at 25 c and 3% in full temperature range n internal power and thermal limit n wide operating temperature range -40 c to 125 c n package available : dpak n pinout compatibility with standard adjustable vreg description the ld1085 is a low drop voltage regulator able to provide up to 3a of output current. dropout is guaranteed at a maximum of 1.5v at the maximum output current, decreasing at lower loads. the ld1085 is pin to pin compatible with the older 3-terminal adjustable regulators, but has better performances in term of drop and output tolerance . a 2.85v output version is suitable for scsi-2 active termination. unlike pnp regulators, where a part of the output current is wasted as quiescent current, the ld1085 quiescent current flows into the load, so increase efficiency. only a 10 m f minimum capacitor is need for stability. the device is supplied in dpak. on chip trimming allows the regulator to reach a very tight output voltage tolerance, within 2% at 25 c. ld1085c series 3a low drop positive voltage regulator adjustable and fixed schematic diagram dpak
ld1085c series 2/14 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. thermal data application circuits symbol paramet er value unit v i dc input voltage 30 v i o output current internally limited ma p d power dissipation internally limited mw t stg storage temperature range -55 to +150 c t op operating junction temperature range -40 to +125 c symbol parameter dpak unit r thj-case thermal resistance junction-case 3 c/w r thj-amb thermal resistance junction-ambient 62.5 c/w r 2 v o =v ref (1 + ?? ) r 1
ld1085c series 3/14 connection diagram (top view) ordering codes (*) available in tape & reel with the suffix oro for fixed version and o-ro for adjustable version. dpak dpak (*) output voltage ld1085cdt18 1.8 v ld1085cdt25 2.5 v ld1085cdt28 2.85 v ld1085cdt33 3.3 v ld1085cdt36 3.6 v ld1085cdt50 5.0 v ld1085cdt80 8.0 v ld1085cdt90 9.0 v ld1085cdt120 12.0 v ld1085cdt adj
ld1085c series 4/14 electrical characteristics of ld1085cdt18 (v i =4.8v, c i =c o =10 m f, t a = -40 to 125 c, unless otherwise specified.) note 1: see short-circuit current curve for available output current at fixed dropout. electrical characteristics of ld1085cdt25 (v i =5.5v, c i =c o =10 m f, t a = -40 to 125 c, unless otherwise specified.) note 1: see short-circuit current curve for available output current at fixed dropout. symbol parameter test conditions min. typ. max. unit v o output voltage i o = 0 ma t j =25 c 1.764 1.8 1.836 v i o = 0 to 3a v i = 3.4 to 30v (note 1) 1.746 1.8 1.854 v d v o line regulation i o = 0 ma v i = 3.4 to 18v t j =25 c 0.2 4 mv i o = 0 ma v i = 3.4 to 15v 0.4 4 mv d v o load regulation i o = 0 to 3a t j =25 c 2 10 mv i o = 0 to 3a 4 20 v v d dropout voltage i o =3 a 1.3 1.5 v i q quiescent current v i 30v 5 10 ma i sc short circuit current v i -v o = 5v 3.2 4.5 a v i -v o = 25v 0.2 0.5 a termal regulation t a =25 c, 30ms pulse 0.003 0.015 %/w svr supply voltage rejection f = 120 hz, c o =25 m f, i o =3a v i = 7.5 3v 60 75 db en rms output noise voltage (% of v o ) t a =25 c f =10hz to 10khz 0.003 % s temperature stability 0.5 % s long term stability t a = 125 c 1000hrs 0.5 % symbol parameter test conditions min. typ. max. unit v o output voltage i o = 0 ma t j =25 c 2.45 2.5 2.55 v i o = 0 to 3a v i = 4.1 to 30v (note 1) 2.425 2.5 2.575 v d v o line regulation i o = 0 ma v i = 4.1 to 18v t j =25 c 0.2 5 mv i o = 0 ma v i = 4.1 to 18v 0.4 5 mv d v o load regulation i o = 0 to 3a t j =25 c 2 10 mv i o = 0 to 3a 4 20 v v d dropout voltage i o =3 a 1.3 1.5 v i q quiescent current v i 30v 5 10 ma i sc short circuit current v i -v o = 5v 3.2 4.5 a v i -v o = 25v 0.2 0.5 a termal regulation t a =25 c, 30ms pulse 0.008 0.04 %/w svr supply voltage rejection f = 120 hz, c o =25 m f, i o =3a v i = 7.5 3v 60 72 db en rms output noise voltage (% of v o ) t a =25 c f =10hz to 10khz 0.003 % s temperature stability 0.5 % s long term stability t a = 125 c 1000hrs 0.5 %
ld1085c series 5/14 electrical characteristics of ld1085cdt285 (v i =5.85v, c i =c o =10 m f, t a = -40 to 125 c, unless otherwise specified.) note 1: see short-circuit current curve for available output current at fixed dropout. electrical characteristics of ld1085cdt33 (v i =6.3v, c i =c o =10 m f, t a = -40 to 125 c, unless otherwise specified.) note 1: see short-circuit current curve for available output current at fixed dropout. symbol parameter test conditio ns min. typ. max. unit v o output voltage i o = 0 ma t j =25 c 2.793 2.85 2.907 v i o = 0 to 3a v i = 4.5 to 30v (note 1) 2.765 2.85 2.935 v d v o line regulation i o = 0 ma v i = 4.5 to 18v t j =25 c 0.2 6 mv i o = 0 ma v i = 4.5 to 18v 0.5 6 mv d v o load regulation i o = 0 to 3a t j =25 c 3 15 mv i o = 0 to 3a 7 20 v v d dropout voltage i o =3 a 1.3 1.5 v i q quiescent current v i 30v 5 10 ma i sc short circuit current v i -v o = 5v 3.2 4.5 a v i -v o = 25v 0.2 0.5 a termal regulation t a =25 c, 30ms pulse 0.008 0.04 %/w svr supply voltage rejection f = 120 hz, c o =25 m f, i o =3a v i = 7.85 3v 60 72 db en rms output noise voltage (% of v o ) t a =25 c f =10hz to 10khz 0.003 % s temperature stability 0.5 % s long term stability t a = 125 c 1000hrs 0.5 % symbol parameter test conditio ns min. typ. max. unit v o output voltage i o = 0 ma t j =25 c 3.234 3.35 3.366 v i o = 0 to 3a v i = 4.9 to 30v (note 1) 3.201 3.35 3.399 v d v o line regulation i o = 0 ma v i = 4.9 to 18v t j =25 c 0.5 6 mv i o = 0 ma v i = 4.9 to 18v 1 6 mv d v o load regulation i o = 0 to 3a t j =25 c 3 15 mv i o = 0 to 3a 7 20 v v d dropout voltage i o =3 a 1.3 1.5 v i q quiescent current v i 30v 5 10 ma i sc short circuit current v i -v o = 5v 3.2 4.5 a v i -v o = 25v 0.2 0.5 a termal regulation t a =25 c, 30ms pulse 0.008 0.04 %/w svr supply voltage rejection f = 120 hz, c o =25 m f, i o =5a v i = 8.3 3v 60 72 db en rms output noise voltage (% of v o ) t a =25 c f =10hz to 10khz 0.003 % s temperature stability 0.5 % s long term stability t a = 125 c 1000hrs 0.5 %
ld1085c series 6/14 electrical characteristics of ld1085cdt36 (v i =6.6v, c i =c o =10 m f, t a = -40 to 125 c, unless otherwise specified.) note 1: see short-circuit current curve for available output current at fixed dropout. electrical characteristics of ld1085cdt50 (v i =8v, c i =c o =10 m f, t a = -40 to 125 c, unless otherwise specified.) note 1: see short-circuit current curve for available output current at fixed dropout. symbol parameter test conditions min. typ. max. unit v o output voltage i o = 0 ma t j =25 c 3.528 3.6 3.672 v i o = 0 to 3a v i = 5.2 to 30v (note 1) 3.492 3.6 3.708 v d v o line regulation i o = 0 ma v i = 5.2 to 18v t j =25 c 0.5 10 mv i o = 0 ma v i = 5.2 to 18v 1 10 mv d v o load regulation i o = 0 to 3a t j =25 c 3 15 mv i o = 0 to 3a 7 20 v v d dropout voltage i o =3 a 1.3 1.5 v i q quiescent current v i 30v 5 10 ma i sc short circuit current v i -v o = 5v 3.2 4.5 a v i -v o = 25v 0.2 0.5 a termal regulation t a =25 c, 30ms pulse 0.008 0.04 %/w svr supply voltage rejection f = 120 hz, c o =25 m f, i o =3a v i = 8.6 3v 60 72 db en rms output noise voltage (% of v o ) t a =25 c f =10hz to 10khz 0.003 % s temperature stability 0.5 % s long term stability t a = 125 c 1000hrs 0.5 % symbol parameter test conditions min. typ. max. unit v o output voltage i o = 0 ma t j =25 c 4.9 5 5.1 v i o = 0 to 3a v i = 6.6 to 30v (note 1) 4.85 5 5.15 v d v o line regulation i o = 0 ma v i = 6.6 to 20v t j =25 c 0.5 10 mv i o = 0 ma v i = 6.6 to 20v 1 10 mv d v o load regulation i o = 0 to 3a t j =25 c 5 20 mv i o = 0 to 3a 10 35 v v d dropout voltage i o =3 a 1.3 1.5 v i q quiescent current v i 30v 5 10 ma i sc short circuit current v i -v o = 5v 3.2 4.5 a v i -v o = 25v 0.2 0.5 a termal regulation t a =25 c, 30ms pulse 0.008 0.04 %/w svr supply voltage rejection f = 120 hz, c o =25 m f, i o =3a v i =10 3v 60 72 db en rms output noise voltage (% of v o ) t a =25 c f =10hz to 10khz 0.003 % s temperature stability 0.5 % s long term stability t a = 125 c 1000hrs 0.5 %
ld1085c series 7/14 electrical characteristics of ld1085cdt80 (v i =11v, c i =c o =10 m f, t a = -40 to 125 c, unless otherwise specified.) note 1: see short-circuit current curve for available output current at fixed dropout. electrical characteristics of ld1085cdt90 (v i =12v, c i =c o =10 m f, t a = -40 to 125 c, unless otherwise specified.) note 1: see short-circuit current curve for available output current at fixed dropout. symbol parameter test conditions min. typ. max. unit v o output voltage i o = 0 ma t j =25 c 7.84 8 8.16 v i o = 0 to 3a v i = 9.8 to 30v (note 1) 7.76 8 8.24 v d v o line regulation i o = 0 ma v i = 9.8 to 20v t j =25 c 1 18 mv i o = 0 ma v i = 9.8 to 20v 2 18 mv d v o load regulation i o = 0 to 3a t j =25 c 8 30 mv i o = 0 to 3a 12 60 v v d dropout voltage i o =3 a 1.3 1.5 v i q quiescent current v i 30v 5 10 ma i sc short circuit current v i -v o = 5v 3.2 4.5 a v i -v o = 25v 0.2 0.5 a termal regulation t a =25 c, 30ms pulse 0.008 0.04 %/w svr supply voltage rejection f = 120 hz, c o =25 m f, i o =3a v i =13 3v 54 71 db en rms output noise voltage (% of v o ) t a =25 c f =10hz to 10khz 0.003 % s temperature stability 0.5 % s long term stability t a = 125 c 1000hrs 0.5 % symbol parameter test conditions min. typ. max. unit v o output voltage i o = 0 ma t j =25 c 8.82 9 9.18 v i o = 0 to 3a v i = 11 to 30v (note 1) 8.73 9 9.27 v d v o line regulation i o = 0 ma v i = 11 to 20v t j =25 c 1 20 mv i o = 0 ma v i = 11 to 20v 2 20 mv d v o load regulation i o = 0 to 3a t j =25 c 8 30 mv i o = 0 to 3a 12 60 v v d dropout voltage i o =3 a 1.3 1.5 v i q quiescent current v i 30v 5 10 ma i sc short circuit current v i -v o = 5v 5.5 6.5 a v i -v o = 25v 0.5 0.7 a termal regulation t a =25 c, 30ms pulse 0.008 0.04 %/w svr supply voltage rejection f = 120 hz, c o =25 m f, i o =3a v i =14 3v 54 70 db en rms output noise voltage (% of v o ) t a =25 c f =10hz to 10khz 0.003 % s temperature stability 0.5 % s long term stability t a = 125 c 1000hrs 0.5 %
ld1085c series 8/14 electrical characteristics of ld1085cdt120 (v i =15v, c i =c o =10 m f, t a = -40 to 125 c, unless otherwise specified.) note 1: see short-circuit current curve for available output current at fixed dropout. electrical characteristics of ld1085cdt (v i =4.25v, c i =c o =10 m f, t a = -40 to 125 c, unless otherwise specified.) note 1: see short-circuit current curve for available output current at fixed dropout. symbol parameter test conditions min. typ. max. unit v o output voltage i o = 0 ma t j =25 c 11.76 12 12.24 v i o = 0 to 3a v i = 13.8 to 30v (note 1) 11.64 12 12.36 v d v o line regulation i o = 0 ma v i = 13.8 to 25v t j =25 c 1 25 mv i o = 0 ma v i = 13.8 to 25v 2 25 mv d v o load regulation i o = 0 to 3a t j =25 c1236mv i o = 0 to 3a 24 72 v v d dropout voltage i o =3 a 1.3 1.5 v i q quiescent current v i 30v 5 10 ma i sc short circuit current v i -v o = 5v 3.2 4.5 a v i -v o = 25v 0.2 0.5 a termal regulation t a =25 c, 30ms pulse 0.008 0.04 %/w svr supply voltage rejection f = 120 hz, c o =25 m f, i o =3a v i =17 3v 54 66 db en rms output noise voltage (% of v o ) t a =25 c f =10hz to 10khz 0.003 % s temperature stability 0.5 % s long term stability t a = 125 c 1000hrs 0.5 % symbol parameter test conditions min. typ. max. unit v o output voltage i o = 10ma t j =25 c 1.225 1.25 1.275 v i o = 10ma to 5av i = 2.85 to 30v (note 1) 1.213 1.25 1.288 v d v o line regulation i o = 10ma v i = 2.85 to 16.5v t j =25 c 0.015 0.2 % i o = 10ma v i = 2.85 to 16.5v 0.035 0.2 % d v o load regulation i o = 10ma to 5at j =25 c 0.1 0.3 % i o = 0 to 5a 0.2 0.4 % v d dropout voltage i o = 5a 1.3 1.5 v i o(min) minimum load current v i = 30v 3 10 ma i sc short circuit current v i -v o = 5v 3.2 4.5 a v i -v o = 25v 0.2 0.5 a termal regulation t a =25 c, 30ms pulse 0.003 0.015 %/w svr supply voltage rejection f = 120 hz, c o =25 m f, c adj =25 m f, i o =5a v i = 6.25 3v 60 75 db i adj adjust pin current v i = 4.25v i o = 10 ma 55 120 m a d i adj adjust pin current change i o = 10ma to 5a v i = 2.75 to 16.5v (note 1) 0.2 5 m a en rms output noise voltage (% of v o ) t a =25 c f =10hz to 10khz 0.003 % s temperature stability 0.5 % s long term stability t a = 125 c 1000hrs 0.5 %
ld1085c series 9/14 typical characteristics (unless otherwise specified t j =25 c, c i =c o =10 m f) figure 1 : output voltage vs temperature figure 2 : output voltage vs temperature figure 3 : output voltage vs temperature figure 4 : short circuit current vs dropout voltage figure 5 : line regulation vs temperature figure 6 : load regulation vs temperature
ld1085c series 10/14 figure 7 : dropout voltage vs temperature figure 8 : dropout voltage vs output current figure 9 : adjust pin current vs temperature figure 10 : quiescent current vs temperature figure 11 : dropout voltage vs output current figure 12 : supply voltage rejection vs output current
ld1085c series 11/14 figure 13 : supply voltage rejection vs frequency figure 14 : supply voltage rejection vs temperature figure 15 : minimum load current vs temperature figure 16 : stability figure 17 : stability figure 18 : line transient v i =12 to 13v, i o =200ma, c i =1 m f(tant), c o =10 m f(tant), c adj =1 m f
ld1085c series 12/14 figure 19 : line transient figure 20 : load transient figure 21 : load transient v i =12 to 13v, i o =200ma, c i =1 m f(tant), c o =10 m f(tant), c adj =1 m f v i =12 v, i o =0.12 to 3 a, c i =1 m f(tant), c o =10 m f(tant) c adj =1 m f v i =12 v, i o =0.12 to 3 a, c i =1 m f(tant), c o =10 m f(tant) c adj =1 m f
ld1085c series 13/14 dim. mm. inch min. typ max. min. typ. max. a 2.2 2.4 0.086 0.094 a1 0.9 1.1 0.035 0.043 a2 0.03 0.23 0.001 0.009 b 0.64 0.9 0.025 0.035 b2 5.2 5.4 0.204 0.212 c 0.45 0.6 0.017 0.023 c2 0.48 0.6 0.019 0.023 d 6 6.2 0.236 0.244 e 6.4 6.6 0.252 0.260 g 4.4 4.6 0.173 0.181 h 9.35 10.1 0.368 0.397 l2 0.8 0.031 l4 0.6 1 0.023 0.039 dpak mechanical data 0068772-b
ld1085c 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 infringe ment of patents or other righ ts of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specifications mentioned in this pub lication are subject to change without notice. thi s pub lication supersedes and replaces all information previously supplied. stmicroelectronics prod ucts are not authori zed for use as critical components in life suppo rt devices or systems without express written approval of stmicroelectronics. ? the st logo is a registered trademark of stmicroelectronics ? 2001 stmicroelectronics - printed in italy - all rights reserved stmicroelectronics group of companies australia - brazil - china - finland - france - germany - hong kong - india - italy - japan - malaysia - malta - morocco singapore - spain - sweden - swit zerland - united kingdom ? http://w ww.st.com

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