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july 2009 doc id 9035 rev 9 1/16 16 ld1084xx 5 a low drop positive voltage regulator adjustable features typical dropout 1.3 v (at 5 a) three terminal adjustable output voltage guaranteed output current up to 5 a output tolerance 1 % at 25 c and 2 % in full temperature range internal power and thermal limit wide operating temperature range -40 c to 125 c package available: to-220 pinout compatibility wi th standard adjustable vreg description the ld1084xx is a low drop voltage regulator able to provide up to 5 a of output current. dropout is guaranteed at a maximum of 1.5 v at the maximum output current, decreasing at lower loads. the ld1084xx is pin to pin compatible with the older 3-terminal adjustable regulators, but has better performances in term of drop and output tolerance. a 2.85 v 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 ld1084xx quiescent current flows into the load, so increase efficiency. only a 10 f minimum capacitor is need for stability. the device is supplied in to-220. on chip trimming allows the regulator to reach a very tight output voltage tolerance, within 1 % at 25 c. to-220 table 1. device summary order code output voltage LD1084V adjustable www.st.com www.datasheet.net/ datasheet pdf - http://www..co.kr/
contents ld1084xx 2/16 doc id 9035 rev 9 contents 1 diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 schematic application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 6 typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 7 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 8 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 www.datasheet.net/ datasheet pdf - http://www..co.kr/
ld1084xx diagram doc id 9035 rev 9 3/16 1 diagram figure 1. schematic diagram www.datasheet.net/ datasheet pdf - http://www..co.kr/
pin configuration ld1084xx 4/16 doc id 9035 rev 9 2 pin configuration figure 2. pin connections (top view) www.datasheet.net/ datasheet pdf - http://www..co.kr/
ld1084xx maximum ratings doc id 9035 rev 9 5/16 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 2. absolute maximum ratings 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 table 3. thermal data symbol parameter to-220 unit r thjc thermal resistance junction-case 3 c/w r thja thermal resistance j unction-ambient 50 c/w www.datasheet.net/ datasheet pdf - http://www..co.kr/
schematic application ld1084xx 6/16 doc id 9035 rev 9 4 schematic application figure 3. application circuit v o v ref 1 r 2 r 1 ------ - + ?? ?? ? = www.datasheet.net/ datasheet pdf - http://www..co.kr/
ld1084xx electrical characteristics doc id 9035 rev 9 7/16 5 electrical characteristics v i = 4.25 v, c i = c o =10 f, t a = -40 to 125 c, unless otherwise specified. table 4. electrical characteristics of ld1084xx symbol parameter test co ndition min. typ. max. unit v o output voltage (1) i o = 10ma t j = 25c 1.237 1.25 1.263 v i o = 10ma to 3a, v i = 2.85 to 30v 1.225 1.25 1.275 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 5a, t 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 5.5 6.5 a v i - v o = 25v 0.5 0.7 a thermal regulation t a = 25c, 30ms pulse 0.003 0.015 %/w svr supply voltage rejection f = 120 hz, c o = 25f,c adj = 25 f, i o = 5a, v i = 6.25 3v 60 72 db i adj adjust pin current v i = 4.25v, i o = 10 ma 55 120 a i adj adjust pin current change (1) i o = 10ma to 5a, v i = 2.85 to 16.5v 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 % 1. see short-circuit current curve for available output current at fixed dropout. www.datasheet.net/ datasheet pdf - http://www..co.kr/
typical application ld1084xx 8/16 doc id 9035 rev 9 6 typical application unless otherwise specified t j = 25 c, c i = 10 f (tant.), c o = 22 f (tant.) figure 4. short circuit current vs. dropout voltage figure 5. line regulation vs. temperature figure 6. quiescent current vs. temperature figure 7. output voltage vs. temperature figure 8. load regulation vs. temperature figure 9. quiescent current vs. output voltage www.datasheet.net/ datasheet pdf - http://www..co.kr/
ld1084xx typical application doc id 9035 rev 9 9/16 figure 10. quiescent current vs. input voltage figure 11. dropout voltage vs. output current figure 12. supply voltage rejection vs. output current figure 13. dropout voltage vs. temperature figure 14. supply voltage rejection vs. temperature figure 15. supply voltage rejection vs. frequency www.datasheet.net/ datasheet pdf - http://www..co.kr/
typical application ld1084xx 10/16 doc id 9035 rev 9 figure 16. adjust pin current vs. output current figure 17. reference voltage vs. temperature figure 18. load regulation vs. temperature figure 19. adjust pin current vs. temperature figure 20. line regulation vs. temperatur e figure 21. minimum load current vs. temperature www.datasheet.net/ datasheet pdf - http://www..co.kr/
ld1084xx typical application doc id 9035 rev 9 11/16 figure 22. supply voltage rejection vs. temperature figure 23. supply voltage rejection vs. frequency figure 24. stability figure 25. supply voltage rejection vs. output current figure 26. stability figur e 27. line transient v i =14 to 15v, i o =200ma,c i = 1f(tant), c o =10f(tant), t s =t f =5ms www.datasheet.net/ datasheet pdf - http://www..co.kr/
typical application ld1084xx 12/16 doc id 9035 rev 9 figure 28. line transient figure 29. load transient v i =12 to 13v, i o =200ma, c i = 1f(tant), c o =10f(tant), no c adj t s =t f =5s v i =15 v, i o =0.1 to 5 a, c i = 1f(tant), c o =10f(tant) figure 30. load transient f igure 31. line transient v i =15 v, i o =0.1 to 5 a, c i = 1f(tant), c o =10f(tant), no c adj v i =12 to 13v, i o =200ma, c i = 1f(tant), c o =10f(tant), c adj = 1f, t s =t f =5s figure 32. load transient v i =13 v, i o =0.1 to 5 a, c i = 1f(tant), c o =10f(tant) www.datasheet.net/ datasheet pdf - http://www..co.kr/
ld1084xx package mechanical data doc id 9035 rev 9 13/16 7 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. www.datasheet.net/ datasheet pdf - http://www..co.kr/
package mechanical data ld1084xx 14/16 doc id 9035 rev 9 dim. mm. inch. min. typ. max. min. typ. max. a 4.40 4.60 0.17 3 0.1 8 1 c1.2 3 1. 3 2 0.04 8 0.051 d 2.40 2.72 0.0 9 4 0.107 d1 1.27 0.050 e0.4 9 0.70 0.01 9 0.027 f 0.61 0. 88 0.024 0.0 3 4 f1 1.14 1.70 0.044 0.067 f2 1.14 1.70 0.044 0.067 g4. 9 5 5.15 0.1 9 4 0.20 3 g1 2.4 2.7 0.0 9 4 0.106 h2 10.0 10.40 0. 393 0.40 9 l2 16.4 0.645 l4 1 3 .0 14.0 0.511 0.551 l5 2.65 2. 9 5 0.104 0.116 l6 15.25 15.75 0.600 0.620 l7 6.2 6.6 0.244 0.260 l 93 .5 3 . 93 0.1 3 7 0.154 dia. 3 .75 3 . 8 5 0.147 0.151 to-220 mechanical data p011c www.datasheet.net/ datasheet pdf - http://www..co.kr/
ld1084xx revision history doc id 9035 rev 9 15/16 8 revision history table 5. document revision history date revision changes 07-oct-2004 3 mistake order codes - table 1. 08-feb-2005 4 mistake u.m. load regulation - v ==> mv. 16-jun-2005 5 order codes updated. 04-apr-2007 6 order code updated. 07-jun-2007 7 order codes updated. 08-apr-2008 8 modified: table 1 on page 1 . removed: packages d2pak, d2pak/a and mechanical data. 29-jul-2009 9 modified: table 1 on page 1 . www.datasheet.net/ datasheet pdf - http://www..co.kr/
ld1084xx 16/16 doc id 9035 rev 9 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. ? 2009 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 - sweden - switzerland - united kingdom - united states of america www.st.com www.datasheet.net/ datasheet pdf - http://www..co.kr/

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