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july 2008 rev 11 1/17 17 lk112sxx low noise low drop voltage regu lator with shutdown function features output current up to 200 ma low dropout voltage (500 mv max at i out = 200 ma) very low quiescent current: 0.1 a in off mode and max 250 a in on mode at i out = 0 ma low output noise: typ. 30 v at i out = 60 ma and 10 hz < f < 80 khz wide range of output voltages internal current and thermal limit v out tolerance 2% (at 25 c) operative input voltage from: v out + 0.5 to 14 v (for v out > 2 v) or from 2.5 v to 14 v (for v out < 2 v) description the lk112sxx is a low dropout linear regulator with a built in electronic switch. the internal switch can be controlled by ttl or cmos logic levels. the device is on state when the control pin is pulled to a logic high level. an external capacitor can be used connected to the noise bypass pin to lower the output noise level to 30 vrms. an internal pnp pass transistor is used to achieve a low dropout voltage. the lk112sxx has a very low quiescent current in on mode while in off mode the iq is reduced down to 100 na max. the internal thermal shutdown circuitry limits the junction temperature to below 150 c. the load current is internally monitored and the device will shutdown in the presence of a short circuit or overcurrent condition at the output. sot23-5l table 1. device summary part numbers lk112sxx13 lk112sxx24 lk112sxx36 lk112sxx45 lk112sxx14 lk112sxx26 lk112sxx37 lk112sxx46 lk112sxx18 lk112sxx28 lk112sxx38 lk112sxx47 lk112sxx19 lk112sxx29 lk112sxx39 lk112sxx48 lk112sxx20 lk112sxx31 lk112sxx41 lk112sxx49 lk112sxx21 lk112sxx33 lk112sxx42 lk112sxx50 lk112sxx22 lk112sxx34 lk112sxx43 lk112sxx23 lk112sxx35 lk112sxx44 www.st.com
contents lk112sxx 2/17 contents 1 diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 6 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7 order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 8 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
lk112sxx diagram 3/17 1 diagram figure 1. schematic diagram
pin configuration lk112sxx 4/17 2 pin configuration figure 2. pin connection (top view) table 2. pin description pin n symbol note 1 shdn shutdown input: disables the regulator w hen is connected to gnd or to positive voltage less than 0.6 v 2gnd ground pin: internally connected to the die attach flag to decrease the total thermal resistance and increase the package ability to dissipate power. 3 bypass bypass pin: bypass with 0.1 f to improve the v ref thermal noise performances. 4 out output port 5 in input port
lk112sxx maximum ratings 5/17 3 maximum ratings table 3. absolute maximum ratings symbol parameter value unit v i dc input voltage 16 v v shdn dc input voltage 16 v i o output current internally limited t stg storage temperature range -55 to 150 c t op operating junction temperature range -40 to 125 c table 4. thermal data symbol parameter sot23-5l unit r thjc thermal resistance junction-case 81 c/w r thja thermal resistance j unction-ambient 255 c/w
electrical characteristics lk112sxx 6/17 4 electrical characteristics table 5. electrical characteristics for lk112s (t j = 25 c, v in =v out +1 v (1) , i out = 0ma, v shdn = 1.8 v, c i = 1 f, c o = 2.2 f, c bypass = 0.1 f unless otherwise specified) 1. for version with output voltage less than 2v v in =2.4v symbol parameter test conditions min. typ. max. unit i d quiescent current on mode (except i shdn )175250a off mode, v i = 8v, v shdn = 0v 0 0.1 a v o output voltage i o = 30ma (see table) v o line regulation v i = v o +1v to v o +6v, v o 5.6v 0.7 20 mv v i = v o +1v to v o +6v, v o > 5.6v 0.8 40 mv v o load regulation i o = 1 to 60ma 15 30 mv i o = 1 to 200ma 30 90 mv v d dropout voltage i o = 60 ma (2) 2. only for version with output voltage more than 2.1v 0.17 0.24 v i o = 200 ma (2) 0.35 0.5 v i sc short circuit current 200 ma svr supply voltage rejection v i = v o +1.5v, c byp = 0.1f c o = 10f, f = 400hz, i o = 30ma 55 db en output noise voltage b= 10hz to 80khz, c byp = 0.1f c o = 10f, v i = v o +1.5v, i o = 60ma 30 vrms i shdn shutdown input current v shdn = 1.8v, output on 12 35 a v shdn shutdown input logic output on 1.8 v output off 0.6 v o /t j output voltage temperature coefficient i o = 10ma 0.09 mv/c
lk112sxx typical characteristics 7/17 5 typical characteristics (unless otherwise specified, t j = 25 c, c i = 1 f, c o = 2.2 f, c byp = 100 nf) figure 3. output voltage vs temperature figure 4. output voltage vs temperature figure 5. line regulation vs temperature figure 6. load regulation vs temperature figure 7. dropout voltage vs temperature figure 8. short circuit current vs dropout voltage
typical characteristics lk112sxx 8/17 figure 9. output voltage vs input voltage figure 10. shutdown voltage vs temperature figure 11. shutdown current vs shutdown voltage figure 12. supply voltage rejection vs temperature figure 13. supply voltage rejection vs output current figure 14. supply voltage rejection vs frequency
lk112sxx typical characteristics 9/17 figure 15. supply voltage rejection vs temperature figure 16. quiescent current vs temperature figure 17. quiescent current vs input voltage figure 18. quiescent current vs shutdown voltage figure 19. quiescent current vs temperature figure 20. reverse current vs reverse voltage
typical characteristics lk112sxx 10/17 figure 21. stability figure 22. spectrum noise figure 23. start-up transient figure 24. start-up transient v i =3.5v, v o =2.5v, v shdn = 0 to 1.8v, r l =2.5k , c i =1f, c o =4.7f, c byp =10nf v i =3.5v, v o =2.5v, v shdn = 0 to 1.8v, r l =68 , c i =1f, c o =4.7f, c byp =100nf figure 25. line transient figure 26. line transient v i =3.5 to 4.5v, v o =2.5v, v shdn = 1.8v, i o =30ma, no c i , c o =100f, c byp =10nf, t s =t f =2s v i =3.5 to 4.5v, v o =2.5v, v shdn = 1.8v, i o =30ma, no c i , c o =10f, c byp =10nf, t s =t f =2s
lk112sxx typical characteristics 11/17 figure 27. line transient figure 28. load transient v i =3.5 to 4.5v, v o =2.5v, v shdn = 1.8v, i o =30ma, no c i , c o =1f, c byp =1nf, t s =t f =2s v i =3.5v, v o =2.5v, v shdn = 1.8v, i o =50 to 100ma, c i =1f, c o =2.2f, c byp =10nf, t s =t f =250ns figure 29. load transient figure 30. load transient v i =3.5v, v o =2.5v, v shdn = 1.8v, i o =50 to 100ma, c i =1f, c o =10f, c byp =100nf, t s =t f =250ns v i =4.8v, v o =3.8v, v shdn = 1.8v, i o =50 to 100ma, c i =1f, c o =2.2f, c byp =10nf, t s =t f =250ns
package mechanical data lk112sxx 12/17 6 package mechanical data in order to meet environmental requirements, st offers these devices in ecopack ? packages. these packages have a lead-free second level interconnect. the category of second level interconnect is marked on the package and on the inner box label, in compliance with jedec standard jesd97. the maximum ratings related to soldering conditions are also marked on the inner box label. ecopack is an st trademark. ecopack specifications are available at: www.st.com.
lk112sxx package mechanical data 13/17 dim. mm. mil s . min. typ. max. min. typ. max. a0. 9 0 1.45 3 5.4 57.1 a1 0.00 0.10 0.0 3 . 9 a2 0. 9 01. 3 0 3 5.4 51.2 b 0. 3 5 0.50 1 3 .7 1 9 .7 c0.0 9 0.20 3 .5 7. 8 d2. 8 0 3 .00 110.2 11 8 .1 e 1.50 1.75 5 9 .0 6 8 . 8 e0. 9 5 3 7.4 h 2.60 3 .00 102. 3 11 8 .1 l 0.10 0.60 3 . 9 2 3 .6 s ot2 3 -5l mechanical data 704 9 676d
package mechanical data lk112sxx 14/17 dim. mm. inch. min. typ. max. min. typ. max. a1 8 0 7.0 8 6 c 12. 8 1 3 .0 1 3 .2 0.504 0.512 0.51 9 d 20.2 0.7 9 5 n60 2. 3 62 t 14.4 0.567 ao 3 .1 33 .2 33 . 33 0.12 3 0.127 0.1 3 1 bo 3 .07 3 .17 3 .27 0.120 0.124 0.12 8 ko 1.27 1. 3 7 1.47 0.050 0.054 0.0.5 8 po 3 . 9 4.0 4.1 0.15 3 0.157 0.161 p 3 . 9 4.0 4.1 0.15 3 0.157 0.161 tape & reel s ot2 3 -xl mechanical data
lk112sxx order codes 15/17 7 order codes table 6. order codes part number output voltage v out min. v out max. test voltage lk112sm13tr (1) 1. available on request. 1.3v 1.24v 1.36v 2.4v lk112sm14tr (1) 1.4v 1.34v 1.46v 2.4v lk112sm18tr 1.8v 1.74v 1.86v 2.4v lk112sm19tr (1) 1.9v 1.84v 1.96v 2.4v lk112sm20tr (1) 2.0v 1.94v 2.06v 3.0v lk112sm21tr (1) 2.1v 2.04v 2.16v 3.1v lk112sm22tr (1) 2.2v 2.14v 2.26v 3.2v lk112sm23tr (1) 2.3v 2.24v 2.36v 3.3v lk112sm24tr (1) 2.4v 2.34v 2.46v 3.4v lk112sm26tr (1) 2.6v 2.54v 2.66v 3.6v lk112sm28tr 2.8v 2.74v 2.86v 3.8v lk112sm29tr (1) 2.9v 2.84v 2.96v 3.9v lk112sm31tr (1) 3.1v 3.04v 3.16v 4.1v lk112sm33tr 3.3v 3.24v 3.36v 4.3v lk112sm34tr (1) 3.4v 3.335v 3.465v 4.4v lk112sm35tr (1) 3.5v 3.435v 3.565v 4.5v lk112sm36tr (1) 3.6v 3.535v 3.655v 4.6v LK112SM37TR (1) 3.7v 3.630v 3.770v 4.7v lk112sm38tr (1) 3.8v 3.725v 3.875v 4.8v lk112sm39tr (1) 3.9v 3.825v 3.975v 4.9v lk112sm41tr (1) 4.1v 4.020v 4.180v 5.1v lk112sm42tr (1) 4.2v 4.120v 4.280v 5.2v lk112sm43tr (1) 4.3v 4.215v 4.385v 5.3v lk112sm44tr (1) 4.4v 4.315v 4.485v 5.4v lk112sm45tr (1) 4.5v 4.410v 4.590v 5.5v lk112sm46tr (1) 4.6v 4.510v 4.690v 5.6v lk112sm47tr (1) 4.7v 4.605v 4.795v 5.7v lk112sm48tr (1) 4.8v 4.705v 4.895v 5.8v lk112sm49tr (1) 4.9v 4.800v 5.000v 5.9v lk112sm50tr 5.0v 4.900v 5.100v 6.0v
revision history lk112sxx 16/17 8 revision history table 7. document revision history date revision changes 31-aug-2004 3 mistake on fig. 19. 31-jan-2005 4 change maturity code. 12-jun-2006 5 order codes updated. 17-oct-2006 6 the t op value on table 2 updated. 20-jul-2007 7 add ta bl e 1 in cover page. 21-sep-2007 8 features updated. 11-dec-2007 9 modified: ta b l e 6 . 12-feb-2008 10 modified: table 6 on page 15 . 10-jul-2008 11 modified: table 1 on page 1 and table 6 on page 15 .
lk112sxx 17/17 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 parti cular purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. unless expressly approved in writing by an authorized st representative, st products are not recommended, authorized or warranted for use in milita ry, air craft, space, life saving, or life sustaining applications, nor in products or systems where failure or malfunction may result in personal injury, death, or severe property or environmental damage. st products which are not specified as "automotive grade" may only be used in automotive applications at user?s own risk. resale of st products with provisions different from the statements 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 registered 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. ? 2008 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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