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this is information on a product in full production. february 2014 docid11039 rev 9 1/21 21 lds3985 very low drop and low noise bicmos 300 ma voltage regulator datasheet - production data features ? input voltage from 2.5 v to 6 v ? stable with low esr ceramic capacitors ? very low dropout voltage (150 mv typ. at 300 ma load, 0.4 mv typ. at 1 ma load) ? very low quiescent current (85 a typ. at no load, 200 a typ. at 300 ma load; max.1.5 a in off mode) ? guaranteed output current up to 300 ma ? wide range of output voltages available on request: fixed from 1.25 v to 5 v with 100 mv step ? fast turn-on time: typ. 240 s ?[c o = 2.2 f, c byp = 33 nf and i o = 1 ma] ? logic-controlled electronic shutdown ? internal current and thermal limit ? low output voltage noise: 30 v rms over 10 hz to 100 khz ? svr of 55 db at 1 khz, 50 db at 10 khz ? temperature range: - 40 c to 125 c ? automotive grade product available in dfn6 package, temperature range: - 40 c to 85 c description the lds3985 provides up to 300 ma, from 2.5 v to 6 v input voltage. it is stable with ceramic and high quality tantalum capacitor. the ultra low drop voltage, low quiescent current and low noise make it suitable for low power applications and battery-powered systems. 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. typical applications are mobile phones and similar battery-powered wireless systems, portable information appliances. sot23-5l table 1. device summary packages output voltage sot23-5l dfn6 dfn6 (automotive grade) lds3985m15r lds3985pu15r lds3985pu15ry 1.5 v lds3985m18r lds3985pu18ry 1.8 v lds3985m25r lds3985pu25ry 2.5 v lds3985m28r lds3985pu28r lds3985pu28ry 2.8 v lds3985m30r lds3985pu30ry 3.0 v lds3985m33r lds3985pu33r lds3985pu33ry 3.3 v LDS3985M50R 5.0 v www.st.com
contents lds3985 2/21 docid11039 rev 9 contents 1 diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 6 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7 packaging mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 8 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
docid11039 rev 9 3/21 lds3985 diagram 1 diagram figure 1. schematic diagram
pin configuration lds3985 4/21 docid11039 rev 9 2 pin configuration figure 2. pin connections (top view for sot23-5l, and for dfn6) ')1 627/ table 2. pin description pin n for sot23-5l pin n for dfn6 symbol name and function 11v i ldo input voltage. 2 5 gnd common ground. 36v inh inhibit input voltage: on mode when v inh 1.2 v, off mode when v inh 0.4 v (do not leave it floating; it is not internally pulled down/up). 4 4 bypass bypass pin: an external capacitor to be connected (usually 10 nf) to minimize noise voltage 53v o ldo output voltage - 2 n.c. not connected.
docid11039 rev 9 5/21 lds3985 maximum ratings 3 maximum ratings note: absolute maximum ratings are those values beyond which damage to the device may occur. functional operation under these condition is not implied. table 3. absolute maximum ratings symbol parameter value unit v i dc input voltage -0.3 to 6 (1) 1. the input pin is able to withstand non repetitive spike of 6.5 v for 200 ms. 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 operating junction temperature range, automotive grade version - 40 to 85 c table 4. thermal data symbol parameter sot23-5l dfn6 unit r thjc thermal resistance junction-case 81 10 c/w r thja thermal resistance junction-ambient 255 55 c/w
electrical characteristics lds3985 6/21 docid11039 rev 9 4 electrical characteristics t j = 25 c, v i = v o(nom) + 0.5 v, c i = 1 f, c o = 2.2 f, c byp = 33 nf, i o = 1 ma, v inh = 1.4 v, unless otherwise specified. table 5. lds3985 electrical characteristics symbol parameter test conditions min. typ. max. unit v i operating input voltage 2.5 6 v v o output voltage < 2.5 v i o = 1 ma -50 50 mv t j = - 40 to 125 c -75 75 v o output voltage 2.5 v i o = 1 ma -2 2 % v o(nom) t j = - 40 to 125 c -3 3 v o line regulation (1) v i = v o(nom) + 0.5 to 6 v, t j = - 40 to 125 c -0.1 0.1 %/v v o = 4.7 to 5 v -0.19 0.19 v o load regulation i o = 1 ma to 300 ma, v o 2.5 v t j = - 40 to 125 c 0.005 0.01 %/ma v o load regulation i o = 1 ma to 300 ma, v o 2.5 v t j = - 40 to 125 c 0.0008 0.004 %/ma v o output ac line regulation (2) v i = v o(nom) + 1 v, i o = 300 ma, t r = t f = 30 s 5mv pp i q quiescent current on mode: v inh = 1.4 v i o = 0 85 a i o = 0, t j = - 40 to 125 c 150 i o = 0 to 300 ma 200 i o = 0 to 300 ma, t j = - 40 to 125 c 300 off mode: v inh = 0.4 v 0.003 t j = - 40 to 125 c 1.5 v drop dropout voltage (3) i o = 1 ma 0.4 mv i o = 1 ma, t j = - 40 to 125 c 2 i o = 150 ma 60 i o = 150 ma, t j = - 40 to 125 c 100 i o = 300 ma 150 i o = 300 ma, t j = - 40 to 125 c 250 i sc short-circuit current r l = 0 600 ma svr supply voltage rejection v i = v o(nom) + 0.25 v v ripple = 0.1 v, i o = 50 ma for v o(nom) < 2.5 v, v i = 2.55 v f = 1 khz 55 db f = 10 khz 50
docid11039 rev 9 7/21 lds3985 electrical characteristics i o(pk) peak output current v o v o(nom) - 5% 300 550 ma v inh inhibit input logic low v i = 2.5 v to 6 v, t j = - 40 to 125 c 0.4 v inhibit input logic high 1.4 i inh inhibit input current v inh = 0.4 v, v i = 6 v 1 na en output noise voltage b w = 10 hz to 100 khz, c o = 2.2 f 30 v rms t on turn-on time (4) c byp = 33 nf 240 s t shdn thermal shutdown (5) 160 c c o output capacitor capacitance 2.2 22 f esr 5 5000 m 1. for v o(nom) < 2 v, v i = 2.5 v. 2. for v o(nom) = 1.25 v, v i = 2.5 v. 3. dropout voltage is the input-to-output voltage difference at whic h the output voltage is 100 mv below its nominal value. this specification does not apply to input voltages below 2.5 v. 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. 5. typical thermal protection hysteresis is 20 c. table 5. lds3985 electrical characteristics (continued) symbol parameter test conditions min. typ. max. unit table 6. lds3985 (automotive grade) electrical characteristics symbol parameter test conditions min. typ. max. unit v i operating input voltage 2.5 6 v v o output voltage < 2.5 v i o = 1 ma -50 50 mv t j = - 40 to 85 c -75 75 v o output voltage 2.5 v i o = 1 ma -2 2 % v o(no m) t j = - 40 to 85 c -3 3 v o line regulation (1) v i = v o(nom) + 0.5 to 6 v, t j = - 40 to 85 c -0.1 0.1 %/v v o = 4.7 to 5 v -0.19 0.19 v o load regulation i o = 1 ma to 300 ma, v o 2.5 v t j = - 40 to 85 c 0.005 0.01 %/ma v o load regulation i o = 1 ma to 300 ma, v o 2.5 v t j = - 40 to 85 c 0.0008 0.004 %/ma v o output ac line regulation (2) v i = v o(nom) + 1 v, i o = 300 ma, t r = t f = 30 s 5mv pp
electrical characteristics lds3985 8/21 docid11039 rev 9 i q quiescent current on mode: v inh = 1.4 v i o = 0 85 a i o = 0, t j = - 40 to 85 c 150 i o = 0 to 300 ma 200 i o = 0 to 300 ma, t j = - 40 to 85 c 300 off mode: v inh = 0.4 v 0.003 t j = - 40 to 85 c 1.5 v drop dropout voltage (3) i o = 1 ma 0.4 mv i o = 1 ma, t j = -40 to 85 c 2 i o = 150 ma 60 i o = 150 ma, t j = - 40 to 85 c 100 i o = 300 ma 150 i o = 300 ma, t j = - 40 to 85 c 250 i sc short-circuit current r l = 0 600 ma svr supply voltage rejection v i = v o(nom) + 0.25 v v ripple = 0.1 v, i o = 50 ma for v o(nom) < 2.5 v, v i = 2.55 v f = 1 khz 55 db f = 10 khz 50 i o(pk) peak output current v o v o(nom) - 5% 300 550 ma v inh inhibit input logic low v i = 2.5 v to 6 v, t j = - 40 to 85 c 0.4 v inhibit input logic high 1.4 i inh inhibit input current v inh = 0.4 v, v i = 6 v 1 na en output noise voltage b w = 10 hz to 100 khz, c o = 2.2 f 30 v rms t on turn-on time (4) c byp = 33 nf 240 s t shdn thermal shutdown (5) 160 c c o output capacitor capacitance 2.2 22 f esr 5 5000 m 1. for v o(nom) < 2 v, v i = 2.5 v. 2. for v o(nom) = 1.25 v, v i = 2.5 v. 3. dropout voltage is the input-to-output voltage difference at which the output voltage is 100 mv below its nominal value. this specification does not apply to input voltages below 2.5 v. 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. 5. typical thermal protecti on hysteresis is 20 c. table 6. lds3985 (automotive grade) electrical characteristics (continued) symbol parameter test conditions min. typ. max. unit
docid11039 rev 9 9/21 lds3985 typical performance characteristics 5 typical performance characteristics t j = 25 c, v i = v o(nom) + 0.5 v, c i = 1 f, c o = 2.2 f, c byp = 33 nf, i o = 1 ma, v inh = 1.4 v, unless otherwise specified. figure 3. output voltage vs. temperature v 0 =1.35 v figure 4. output voltage vs. temperature v 0 =2.8 v figure 5. output voltage vs. temperature v 0 =3.3 v figure 6. inhibit voltage vs. temperature v 0 =1.35 v */) * / )
typical performance characteristics lds3985 10/21 docid11039 rev 9 figure 7. inhibit voltage vs. temperature (v o =3.3 v) figure 8. line regulation vs. temperature (v i = 2.5 v to 6 v) */) * / ) figure 9. line regulation vs. temperature (v i = 3.2 v to 6 v) figure 10. line regulation vs. temperature (v i = 3.8 v to 6 v) figure 11. quiescent current vs. temperature (v i = 2.5 v) figure 12. quiescent current vs. temperature (v i = 6 v)
docid11039 rev 9 11/21 lds3985 typical performance characteristics figure 13. quiescent current vs. temperature (v i = 3.4 v) figure 14. supply voltage rejection vs. frequency figure 15. dropout voltage vs. temperature figure 16. dropout voltage vs. output current figure 17. inhibit transient v i = 5 v, i o = 1 ma, v inh = 0 to 1.2 v, c i = c o = 1 f (cer), c byp = 10 nf, t r = t f = 1 s
package mechanical data lds3985 12/21 docid11039 rev 9 6 package mechanical data in order to meet environmental requirements, st offers these devices in different grades of ecopack ? packages, depending on their level of environmental compliance. ecopack ? specifications, grade definitions and product status are available at: www.st.com . ecopack ? is an st trademark. figure 18. sot23-5l mechanical drawings bn
docid11039 rev 9 13/21 lds3985 package mechanical data figure 19. sot23-5l recommended footprint (dimensions in mm). table 7. sot23-5l mechanical data dim. mm min. typ. max. a0.90 1.45 a1 0 0.15 a2 0.90 1.30 b0.30 0.50 c2.09 0.20 d2.95 e1.60 e0.95 h2.80 l0.30 0.60 08 bn
package mechanical data lds3985 14/21 docid11039 rev 9 figure 20. dfn6 (3 x 3 mm) drawings b&
docid11039 rev 9 15/21 lds3985 package mechanical data table 8. dfn6 (3 x 3 mm) mechanical data dim. mm min. typ. max. a0.80 1 a1 0 0.02 0.05 a3 0.20 b 0.23 0.45 d 2.90 3 3.10 d2 2.23 2.50 e 2.90 3 3.10 e2 1.50 1.75 0.95 l 0.30 0.40 0.50
package mechanical data lds3985 16/21 docid11039 rev 9 figure 21. dfn6 footprint (dimensions in mm) b&
docid11039 rev 9 17/21 lds3985 packaging mechanical data 7 packaging mechanical data figure 22. tape and reel sot23-5l mechanical drawings table 9. tape and reel sot23-5l mechanical data dim. mm min. typ. max. a 180 c 12.8 13.0 13.2 d20.2 n60 t 14.4 ao 3.13 3.23 3.33 bo 3.07 3.17 3.27 ko 1.27 1.37 1.47 po 3.9 4.0 4.1 p 3.9 4.0 4.1
packaging mechanical data lds3985 18/21 docid11039 rev 9 figure 23. tape for dfn6 b1
docid11039 rev 9 19/21 lds3985 packaging mechanical data figure 24. reel for dfn6 table 10. dfn6 tape and reel mechanical data dim. mm min. typ. max. a0 3.20 3.30 3.40 b0 3.20 3.30 3.40 k0 1 1.10 1.20 b1
revision history lds3985 20/21 docid11039 rev 9 8 revision history table 11. document revision history date revision changes 02-dec-2004 1 first release. 10-apr-2007 2 added: new package tsot23-5l. 16-may-2007 3 added: new mechanical data dfn6d and order codes updated. 06-sep-2007 4 added: table 1 in cover page. 11-jun-2008 5 modified: table 10 on page 20 . 11-jul-2009 6 modified: table 10 on page 20 . 29-jul-2010 7 modified: table 1 on page 1 and table 10 on page 20 . 24-oct-2013 8 modified the title and the features in cover page. deleted table1: device summary. updated table 10: order codes and section 6: package mechanical data . added table 6: lds3985 (automotive grade) electrical characteristics and section 7: packaging mechanical data . minor text changes. 28-feb-2014 9 part number lds3985xx changed to lds3985. updated the features, the description and table 1: device summary in cover page. updated table 5: lds3985 electrical characteristics , table 6: lds3985 (automotive grade) electrical characteristics , section 5: typical performance characteristics . minor text changes.
docid11039 rev 9 21/21 lds3985 please read carefully: information in this document is provided solely in connection with st products. stmicroelectronics nv and its subsidiaries (?st ?) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described he rein at any time, without notice. all st products are sold pursuant to st?s terms and conditions of sale. purchasers are solely responsible for the choice, selection and use of the st products and services described herein, and st as sumes no liability whatsoever relating to the choice, selection or use of the st products and services described herein. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. i f any part of this document refers to any third party products or services it shall not be deemed a license grant by st for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoev er of such third party products or services or any intellectual property contained therein. unless otherwise set forth in st?s terms and conditions of sale st disclaims any express or implied warranty with respect to the use and/or sale of st products including without limitation implied warranties of merchantability, fitness for a particular purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. st products are not designed or authorized for use in: (a) safety critical applications such as life supporting, active implanted devices or systems with product functional safety requirements; (b) aeronautic applications; (c) automotive applications or environments, and/or (d) aerospace applications or environments. where st products are not designed for such use, the purchaser shall use products at purchaser?s sole risk, even if st has been informed in writing of such usage, unless a product is expressly designated by st as being intended for ?automotive, automotive safety or medical? industry domains according to st product design specifications. products formally escc, qml or jan qualified are deemed suitable for use in aerospace by the corresponding governmental agency. resale of st products with provisions different from the statem ents and/or technical features set forth in this document shall immediately void any warranty granted by st for the st product or service described herein and shall not create or extend in any manner whatsoev er, any liability of st. st and the st logo are trademarks or register ed trademarks of st in various countries. information in this document supersedes and replaces all information previously supplied. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners. ? 2014 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 - philippines - singapore - spain - swed en - switzerland - united kingdom - united states of america www.st.com

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