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1/16 october 2004 typical dropout 1.3v (at 3a) three terminal adjustable or fixed output voltage 1.5v, 1.8v, 2.5v, 2.85v, 3.3v, 3.6v, 5v, 8v, 9v, 12v. guaranteed output current up to 3a ouput tolerance 2% at 25c and 3% in full temperature range internal power and thermal limit wide operating temperature range -40c to 125c package available: dpak 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 10f 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 25c. ld1085c series 3a low drop positive voltage regulator adjustable and fixed figure 1: schematic diagram dpak rev. 6
ld1085c series 2/16 figure 2: pin connection (top view) table 1: order codes (*) available in tape & reel with the suffix "r" for fixed version and "-r" for adjustable version. table 2: absolute maximum ratings absolute maximum ratings are those values beyond which damage to the device may occur. functional operation under these conditi on is not implied. table 3: thermal data dpak (*) output voltage ld1085cdt15 1.5 v 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 ld1085cdt12 12.0 v ld1085cdt adj symbol parameter 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 3c/w r thj-amb thermal resistance junction-ambient 62.5 c/w dpak
ld1085c series 3/16 figure 3: application circuits table 4: electrical characteristics of ld1085cdt15 (v i =4.5v, c i = c o =10 f, t a = -40 to 125c, 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 = 25c 1.47 1.5 1.53 v i o = 0 to 3av i = 3.1 to 30v (note 1) 1.455 1.5 1.545 v ? v o line regulation i o = 0 ma v i = 3.1 to 18v t j = 25c 0.2 4 mv i o = 0 ma v i = 3.1 to 15v 0.4 4 mv ? v o load regulation i o = 0 to 3at j = 25c 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 thermal regulation t a = 25c, 30ms pulse 0.003 0.015 %/w svr supply voltage rejection f = 120 hz, c o = 25 f, i o = 3a v i = 7.5 3v 60 75 db en rms output noise voltage (% of v o ) t a = 25c f =10hz to 10khz 0.003 % s temperature stability 0.5 % s long term stability t a = 125c 1000hrs 0.5 % r 2 v o = v ref (1 + ?? ) r 1
ld1085c series 4/16 table 5: electrical characteristics of ld1085cdt18 (v i =4.8v, c i = c o =10 f, t a = -40 to 125c, unless otherwise specified.) note 1: see short-circuit current curve for available output current at fixed dropout. table 6: electrical characteristics of ld1085cdt25 (v i =5.5v, c i = c o =10 f, t a = -40 to 125c, 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 = 25c 1.764 1.8 1.836 v i o = 0 to 3av i = 3.4 to 30v (note 1) 1.746 1.8 1.854 v ? v o line regulation i o = 0 ma v i = 3.4 to 18v t j = 25c 0.2 4 mv i o = 0 ma v i = 3.4 to 15v 0.4 4 mv ? v o load regulation i o = 0 to 3at j = 25c 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 thermal regulation t a = 25c, 30ms pulse 0.003 0.015 %/w svr supply voltage rejection f = 120 hz, c o = 25 f, i o = 3a v i = 7.5 3v 60 75 db en rms output noise voltage (% of v o ) t a = 25c f =10hz to 10khz 0.003 % s temperature stability 0.5 % s long term stability t a = 125c 1000hrs 0.5 % symbol parameter test conditions min. typ. max. unit v o output voltage i o = 0 ma t j = 25c 2.45 2.5 2.55 v i o = 0 to 3av i = 4.1 to 30v (note 1) 2.425 2.5 2.575 v ? v o line regulation i o = 0 ma v i = 4.1 to 18v t j = 25c 0.2 5 mv i o = 0 ma v i = 4.1 to 18v 0.4 5 mv ? v o load regulation i o = 0 to 3at j = 25c 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 thermal regulation t a = 25c, 30ms pulse 0.008 0.04 %/w svr supply voltage rejection f = 120 hz, c o = 25 f, i o = 3a v i = 7.5 3v 60 72 db en rms output noise voltage (% of v o ) t a = 25c f =10hz to 10khz 0.003 % s temperature stability 0.5 % s long term stability t a = 125c 1000hrs 0.5 %
ld1085c series 5/16 table 7: electrical characteristics of ld1085cdt285 (v i =5.85v, c i = c o =10 f, t a = -40 to 125c, unless otherwise specified.) note 1: see short-circuit current curve for available output current at fixed dropout. table 8: electrical characteristics of ld1085cdt33 (v i =6.3v, c i = c o =10 f, t a = -40 to 125c, 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 = 25c 2.793 2.85 2.907 v i o = 0 to 3av i = 4.5 to 30v (note 1) 2.765 2.85 2.935 v ? v o line regulation i o = 0 ma v i = 4.5 to 18v t j = 25c 0.26mv i o = 0 ma v i = 4.5 to 18v 0.5 6 mv ? v o load regulation i o = 0 to 3at j = 25c 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 thermal regulation t a = 25c, 30ms pulse 0.008 0.04 %/w svr supply voltage rejection f = 120 hz, c o = 25 f, i o = 3a v i = 7.85 3v 60 72 db en rms output noise voltage (% of v o ) t a = 25c f =10hz to 10khz 0.003 % s temperature stability 0.5 % s long term stability t a = 125c 1000hrs 0.5 % symbol parameter test conditions min. typ. max. unit v o output voltage i o = 0 ma t j = 25c 3.234 3.35 3.366 v i o = 0 to 3av i = 4.9 to 30v (note 1) 3.201 3.35 3.399 v ? v o line regulation i o = 0 ma v i = 4.9 to 18v t j = 25c 0.56mv i o = 0 ma v i = 4.9 to 18v 1 6 mv ? v o load regulation i o = 0 to 3at j = 25c 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 thermal regulation t a = 25c, 30ms pulse 0.008 0.04 %/w svr supply voltage rejection f = 120 hz, c o = 25 f, i o = 5a v i = 8.3 3v 60 72 db en rms output noise voltage (% of v o ) t a = 25c f =10hz to 10khz 0.003 % s temperature stability 0.5 % s long term stability t a = 125c 1000hrs 0.5 %
ld1085c series 6/16 table 9: electrical characteristics of ld1085cdt36 (v i =6.6v, c i = c o =10 f, t a = -40 to 125c, unless otherwise specified.) note 1: see short-circuit current curve for available output current at fixed dropout. table 10: electrical characteristics of ld1085cdt50 (v i =8v, c i = c o =10 f, t a = -40 to 125c, 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 = 25c 3.528 3.6 3.672 v i o = 0 to 3av i = 5.2 to 30v (note 1) 3.492 3.6 3.708 v ? v o line regulation i o = 0 ma v i = 5.2 to 18v t j = 25c 0.5 10 mv i o = 0 ma v i = 5.2 to 18v 1 10 mv ? v o load regulation i o = 0 to 3at j = 25c 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 thermal regulation t a = 25c, 30ms pulse 0.008 0.04 %/w svr supply voltage rejection f = 120 hz, c o = 25 f, i o = 3a v i = 8.6 3v 60 72 db en rms output noise voltage (% of v o ) t a = 25c f =10hz to 10khz 0.003 % s temperature stability 0.5 % s long term stability t a = 125c 1000hrs 0.5 % symbol parameter test conditions min. typ. max. unit v o output voltage i o = 0 ma t j = 25c 4.9 5 5.1 v i o = 0 to 3av i = 6.6 to 30v (note 1) 4.85 5 5.15 v ? v o line regulation i o = 0 ma v i = 6.6 to 20v t j = 25c 0.5 10 mv i o = 0 ma v i = 6.6 to 20v 1 10 mv ? v o load regulation i o = 0 to 3at j = 25c 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 thermal regulation t a = 25c, 30ms pulse 0.008 0.04 %/w svr supply voltage rejection f = 120 hz, c o = 25 f, i o = 3a v i = 10 3v 60 72 db en rms output noise voltage (% of v o ) t a = 25c f =10hz to 10khz 0.003 % s temperature stability 0.5 % s long term stability t a = 125c 1000hrs 0.5 %
ld1085c series 7/16 table 11: electrical characteristics of ld1085cdt80 (v i =11v, c i = c o =10 f, t a = -40 to 125c, unless otherwise specified.) note 1: see short-circuit current curve for available output current at fixed dropout. table 12: electrical characteristics of ld1085cdt90 (v i =12v, c i = c o =10 f, t a = -40 to 125c, 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 = 25c 7.84 8 8.16 v i o = 0 to 3av i = 9.8 to 30v (note 1) 7.76 8 8.24 v ? v o line regulation i o = 0 ma v i = 9.8 to 20v t j = 25c 1 18 mv i o = 0 ma v i = 9.8 to 20v 2 18 mv ? v o load regulation i o = 0 to 3at j = 25c 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 thermal regulation t a = 25c, 30ms pulse 0.008 0.04 %/w svr supply voltage rejection f = 120 hz, c o = 25 f, i o = 3a v i = 13 3v 54 71 db en rms output noise voltage (% of v o ) t a = 25c f =10hz to 10khz 0.003 % s temperature stability 0.5 % s long term stability t a = 125c 1000hrs 0.5 % symbol parameter test conditions min. typ. max. unit v o output voltage i o = 0 ma t j = 25c 8.82 9 9.18 v i o = 0 to 3av i = 11 to 30v (note 1) 8.73 9 9.27 v ? v o line regulation i o = 0 ma v i = 11 to 20v t j = 25c 1 20 mv i o = 0 ma v i = 11 to 20v 2 20 mv ? v o load regulation i o = 0 to 3at j = 25c 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 thermal regulation t a = 25c, 30ms pulse 0.008 0.04 %/w svr supply voltage rejection f = 120 hz, c o = 25 f, i o = 3a v i = 14 3v 54 70 db en rms output noise voltage (% of v o ) t a = 25c f =10hz to 10khz 0.003 % s temperature stability 0.5 % s long term stability t a = 125c 1000hrs 0.5 %
ld1085c series 8/16 table 13: electrical characteristics of ld1085cdt12 (v i =15v, c i = c o =10 f, t a = -40 to 125c, unless otherwise specified.) note 1: see short-circuit current curve for available output current at fixed dropout. table 14: electrical characteristics of ld1085cdt (v i =4.25v, c i = c o =10 f, t a = -40 to 125c, 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 = 25c 11.76 12 12.24 v i o = 0 to 3av i = 13.8 to 30v (note 1) 11.64 12 12.36 v ? v o line regulation i o = 0 ma v i = 13.8 to 25v t j = 25c 1 25 mv i o = 0 ma v i = 13.8 to 25v 2 25 mv ? v o load regulation i o = 0 to 3at j = 25c 12 36 mv 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 thermal regulation t a = 25c, 30ms pulse 0.008 0.04 %/w svr supply voltage rejection f = 120 hz, c o = 25 f, i o = 3a v i = 17 3v 54 66 db en rms output noise voltage (% of v o ) t a = 25c f =10hz to 10khz 0.003 % s temperature stability 0.5 % s long term stability t a = 125c 1000hrs 0.5 % symbol parameter test conditions min. typ. max. unit v o output voltage i o = 10ma t j = 25c 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 ? v o line regulation i o = 10ma v i = 2.85 to 16.5v t j = 25c 0.015 0.2 % i o = 10ma v i = 2.85 to 16.5v 0.035 0.2 % ? v o load regulation i o = 10ma to 5at j = 25c 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 thermal regulation t a = 25c, 30ms pulse 0.003 0.015 %/w svr supply voltage rejection f = 120 hz, c o = 25 f, c adj = 25 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 a ? i adj adjust pin current change i o = 10ma to 5a v i = 2.75 to 16.5v (note 1) 0.2 5 a en rms output noise voltage (% of v o ) t a = 25c f =10hz to 10khz 0.003 % s temperature stability 0.5 % s long term stability t a = 125c 1000hrs 0.5 %
ld1085c series 9/16 typical characteristics (unless otherwise specified t j = 25c, c i =c o =10 f) figure 4: output voltage vs temperature figure 5: output voltage vs temperature figure 6: output voltage vs temperature figure 7: short circuit current vs dropout voltage figure 8: line regulation vs temperature figure 9: load regulation vs temperature
ld1085c series 10/16 figure 10: dropout voltage vs temperature figure 11: dropout voltage vs output current figure 12: adjust pin current vs temperature figure 13: quiescent current vs temperature figure 14: dropout voltage vs output current figure 15: supply voltage rejection vs output current
ld1085c series 11/16 figure 16: supply voltage rejection vs frequency figure 17: supply voltage rejection vs temperature figure 18: minimum load current vs temperature figure 19: stability figure 20: stability figure 21: line transient v i =12 to 13v, i o =200ma, c i = 1 f(tant), c o =10 f(tant), c adj = 1 f
ld1085c series 12/16 figure 22: line transient figure 23: load transient figure 24: load transient v i =12 to 13v, i o =200ma, c i = 1 f(tant), c o =10 f(tant), c adj =1 f v i =12 v, i o =0.12 to 3 a, c i = 1 f(tant), c o =10 f(tant) c adj =1 f v i =12 v, i o =0.12 to 3 a, c i = 1 f(tant), c o =10 f(tant) c adj =1 f
ld1085c series 13/16 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 d1 5.1 0.200 e 6.4 6.6 0.252 0.260 e1 4.7 0.185 e 2.28 0.090 e1 4.4 4.6 0.173 0.181 h 9.35 10.1 0.368 0.397 l 1 0.039 (l1) 2.8 0.110 l2 0.8 0.031 l4 0.6 1 0.023 0.039 dpak mechanical data 0068772-f
ld1085c series 14/16 dim. mm. inch min. typ max. min. typ. max. a 330 12.992 c 12.8 13.0 13.2 0.504 0.512 0.519 d 20.2 0.795 n 60 2.362 t 22.4 0.882 ao 6.80 6.90 7.00 0.268 0.272 0.2.76 bo 10.40 10.50 10.60 0.409 0.413 0.417 ko 2.55 2.65 2.75 0.100 0.104 0.105 po 3.9 4.0 4.1 0.153 0.157 0.161 p 7.9 8.0 8.1 0.311 0.315 0.319 tape & reel dpak-ppak mechanical data
ld1085c series 15/16 table 15: revision history date revision description of changes 07-oct-2004 6 mistake order codes - table 1.
ld1085c series 16/16 information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibility for the co nsequences of use of such information nor for any infringement of patents or other rights 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 publicati on are subject to change without notice. this publication supersedes and replaces all information previously supplied. stmicroelectronics prod ucts are not authorized for use as critical components in life support devices or systems without express written approval of stmicroelectro nics. 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 of america www.st.com

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