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this is information on a product in full production. june 2014 docid2149 rev 22 1/28 L79 negative voltage regulators datasheet - production data features ? output current up to 1.5 a ? output voltages of - 5; - 8; - 12; - 15 v ? thermal overload protection ? short circuit protection ? output transition soa protection ? output tolerance 2% (ac version) or 4% (c version) at 25c description the L79 series of three-terminal negative regulators is available in to-220, to-220fp and d2pak packages and several fixed output voltages, making it useful in a wide range of applications. these regulators can provide local on-card regulation, eliminating the distribution problems associated with single point regulation; furthermore, having the same voltage option as the l78 positive standard series, they are particularly suited for split power supplies. if adequate heat sinking is provided, they can deliver over 1.5 a output current. although designed primarily as fixed voltage regulators, these devices can be used with external components to obtain adjustable voltages and currents. to-220 to-220fp d2pak table 1. device summary order codes output voltages to-220 (single gauge) to-220 (dual gauge) d2pak to-220fp L7905acv L7905acv-dg L7905acd2t-tr - 5 v L7905cv L7905cv-dg L7905cd2t-tr L7905cp - 5 v L7908cv L7908cv-dg - 8 v L7912acv L7912acv-dg - 12 v L7912cv L7912cv-dg L7912cd2t-tr L7912cp - 12 v L7915acv L7915acv-dg - 15 v L7915cv L7915cv-dg L7915cp - 15 v www.st.com
contents L79 2/28 docid2149 rev 22 contents 1 diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 6 application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 7 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 8 packaging mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 9 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
docid2149 rev 22 3/28 L79 diagram 28 1 diagram figure 1. schematic diagram
pin configuration L79 4/28 docid2149 rev 22 2 pin configuration figure 2. pin connections (top view) to220fp to-220 d2pak (any type) in
docid2149 rev 22 5/28 L79 maximum ratings 28 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 -35 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 for L79xxc 0 to 150 c for L79xxac 0 to 125 table 3. thermal data symbol parameter d2pak to-220 to-220fp unit r thjc thermal resistance junction-case 3 5 5 c/w r thja thermal resistance junction-ambient 62.5 50 60 c/w
test circuit L79 6/28 docid2149 rev 22 4 test circuit figure 3. test circuit
docid2149 rev 22 7/28 L79 electrical characteristics 28 5 electrical characteristics refer to the test circuits, t j = 0 to 125 c, v i = -10 v, i o = 500 ma, c i = 2.2 f, c o = 1 f unless otherwise specified. table 4. electrical characteristics of L7905ac symbol parameter test conditions min. typ. max. unit v o output voltage t j = 25c -4.9 -5 -5.1 v v o output voltage i o = -5 ma to -1 a, p o 15 w v i = -8 to -20 v -4.8 -5 -5.2 v v o (1) line regulation v i = -7 to -25 v, t j = 25c 100 mv v i = -8 to -12 v, t j = 25c 50 v o (1) load regulation i o = 5 ma to 1.5 a, t j = 25c 100 mv i o = 250 to 750 ma, t j = 25c 50 i d quiescent current t j = 25c 3 ma i d quiescent current change i o = 5 ma to 1 a 0.5 ma v i = -8 to -25 v 1.3 v o / t output voltage drift i o = 5 ma -0.4 mv/c en output noise voltage b = 10 hz to 100 khz, t j = 25c 100 v svr supply voltage rejection v i = 10 v, f = 120 hz 54 60 db v d dropout voltage i o = 1 a, t j = 25c, v o = 100 mv 1.4 v i sc short circuit current 2.1 a i scp short circuit peak current t j = 25c 2.5 a 1. load and line regulation are specified at cons tant junction temperature. changes in v o due to heating effects must be taken into account separately. pulse testing with low duty cycle is used.
electrical characteristics L79 8/28 docid2149 rev 22 refer to the test circuits, t j = 0 to 125 c, v i = -10 v, i o = 500 ma, c i = 2.2 f, c o = 1 f unless otherwise specified. table 5. electrical characteristics of L7905c symbol parameter test conditions min. typ. max. unit v o output voltage t j = 25c -4.8 -5 -5.2 v v o output voltage i o = -5 ma to -1 a, p o 15 w v i = -8 to -20 v -4.75 -5 -5.25 v v o (1) line regulation v i = -7 to -25 v, t j = 25c 100 mv v i = -8 to -12 v, t j = 25c 50 v o (1) load regulation i o = 5 ma to 1.5 a, t j = 25c 100 mv i o = 250 to 750 ma, t j = 25c 50 i d quiescent current t j = 25c 3 ma i d quiescent current change i o = 5 ma to 1 a 0.5 ma v i = -8 to -25 v 1.3 v o / t output voltage drift i o = 5 ma -0.4 mv/c en output noise voltage b = 10 hz to 100 khz, t j = 25c 100 v svr supply voltage rejection v i = 10 v, f = 120 hz 54 60 db v d dropout voltage i o = 1 a, t j = 25c, v o = 100 mv 1.4 v i sc short circuit current 2.1 a 1. load and line regulation are specified at cons tant junction temperature. changes in v o due to heating effects must be taken into account separately. pulse testing with low duty cycle is used.
docid2149 rev 22 9/28 L79 electrical characteristics 28 refer to the test circuits, t j = 0 to 125 c, v i = -14 v, i o = 500 ma, c i = 2.2 f, c o = 1 f unless otherwise specified. table 6. electrical characteristics of L7908c symbol parameter test conditions min. typ. max. unit v o output voltage t j = 25c -7.7 -8 -8.3 v v o output voltage i o = -5 ma to -1 a, p o 15 w v i = -11.5 to -23 v -7.6 -8 -8.4 v v o (1) line regulation v i = -10.5 to -25 v, t j = 25c 160 mv v i = -11 to -17 v, t j = 25c 80 v o (1) load regulation i o = 5 ma to 1.5 a, t j = 25c 160 mv i o = 250 to 750 ma, t j = 25c 80 i d quiescent current t j = 25c 3 ma i d quiescent current change i o = 5 ma to 1 a 0.5 ma v i = -11.5 to -25 v 1 v o / t output voltage drift i o = 5 ma -0.6 mv/c en output noise voltage b = 10 hz to 100 khz, t j = 25c 175 v svr supply voltage rejection v i = 10 v, f = 120 hz 54 60 db v d dropout voltage i o = 1 a, t j = 25c, v o = 100 mv 1.1 v i sc short circuit current 1.5 a 1. load and line regulation are specified at cons tant junction temperature. changes in v o due to heating effects must be taken into account separately. pulse testing with low duty cycle is used.
electrical characteristics L79 10/28 docid2149 rev 22 refer to the test circuits, t j = 0 to 125 c, v i = -19 v, i o = 500 ma, c i = 2.2 f, c o = 1 f unless otherwise specified. table 7. electrical characteristics of L7912ac symbol parameter test conditions min. typ. max. unit v o output voltage t j = 25c -11.75 -12 -12.25 v v o output voltage i o = -5 ma to -1 a, p o 15 w v i = -15.5 to -27 v -11.5 -12 -12.5 v v o (1) line regulation v i = -14.5 to -30 v, t j = 25c 240 mv v i = -16 to -22 v, t j = 25c 120 v o (1) load regulation i o = 5 ma to 1.5 a, t j = 25c 240 mv i o = 250 to 750 ma, t j = 25c 120 i d quiescent current t j = 25c 3 ma i d quiescent current change i o = 5 ma to 1 a 0.5 ma v i = -15 to -30 v 1 v o / t output voltage drift i o = 5 ma -0.8 mv/c en output noise voltage b = 10 hz to 100 khz, t j = 25c 200 v svr supply voltage rejection v i = 10 v, f = 120 hz 54 60 db v d dropout voltage i o = 1 a, t j = 25c, v o = 100 mv 1.1 v i sc short circuit current 1.5 a i scp short circuit peak current t j = 25c 2.5 a 1. load and line regulation are specified at cons tant junction temperature. changes in v o due to heating effects must be taken into account separately. pulse testing with low duty cycle is used.
docid2149 rev 22 11/28 L79 electrical characteristics 28 refer to the test circuits, t j = 0 to 125 c, v i = -19 v, i o = 500 ma, c i = 2.2 f, c o = 1 f unless otherwise specified. table 8. electrical characteristics of L7912c symbol parameter test conditions min. typ. max. unit v o output voltage t j = 25c -11.5 -12 -12.5 v v o output voltage i o = -5 ma to -1 a, p o 15 w v i = -15.5 to -27 v -11.4 -12 -12.6 v v o (1) line regulation v i = -14.5 to -30 v, t j = 25c 240 mv v i = -16 to -22 v, t j = 25c 120 v o (1) load regulation i o = 5 ma to 1.5 a, t j = 25c 240 mv i o = 250 to 750 ma, t j = 25c 120 i d quiescent current t j = 25c 3 ma i d quiescent current change i o = 5 ma to 1 a 0.5 ma v i = -15 to -30 v 1 v o / t output voltage drift i o = 5 ma -0.8 mv/c en output noise voltage b = 10 hz to 100 khz, t j = 25c 200 v svr supply voltage rejection v i = 10 v, f = 120hz 54 60 db v d dropout voltage i o = 1 a, t j = 25c, v o = 100 mv 1.1 v i sc short circuit current 1.5 a 1. load and line regulation are specified at cons tant junction temperature. changes in v o due to heating effects must be taken into account separately. pulse testing with low duty cycle is used.
electrical characteristics L79 12/28 docid2149 rev 22 refer to the test circuits, t j = 0 to 125 c, v i = -23 v, i o = 500 ma, c i = 2.2 f, c o = 1 f unless otherwise specified. table 9. electrical characteristics of L7915ac symbol parameter test conditions min. typ. max. unit v o output voltage t j = 25c -14.7 -15 -15.3 v v o output voltage i o = -5 ma to -1 a, p o 15 w v i = -18.5 to -30 v -14.4 -15 -15.6 v v o (1) line regulation v i = -17.5 to -30 v, t j = 25c 300 mv v i = -20 to -26 v, t j = 25c 150 v o (1) load regulation i o = 5 ma to 1.5 a, t j = 25c 300 mv i o = 250 to 750 ma, t j = 25c 150 i d quiescent current t j = 25c 3 ma i d quiescent current change i o = 5 ma to 1 a 0.5 ma v i = -18.5 to -30 v 1 v o / t output voltage drift i o = 5 ma -0.9 mv/c en output noise voltage b = 10 hz to 100 khz, t j = 25c 250 v svr supply voltage rejection v i = 10 v, f = 120 hz 54 60 db v d dropout voltage i o = 1 a, t j = 25c, v o = 100 mv 1.1 v i sc short circuit current 1.3 a i scp short circuit peak current t j = 25c 2.5 a 1. load and line regulation are specified at cons tant junction temperature. changes in v o due to heating effects must be taken into account separately. pulse testing with low duty cycle is used.
docid2149 rev 22 13/28 L79 electrical characteristics 28 refer to the test circuits, t j = 0 to 125 c, v i = -23 v, i o = 500 ma, c i = 2.2 f, c o = 1 f unless otherwise specified. table 10. electrical characteristics of L7915c symbol parameter test conditions min. typ. max. unit v o output voltage t j = 25c -14.4 -15 -15.6 v v o output voltage i o = -5 ma to -1 a, p o 15 w v i = -18.5 to -30 v -14.3 -15 -15.7 v v o (1) line regulation v i = -17.5 to -30 v, t j = 25c 300 mv v i = -20 to -26 v, t j = 25c 150 v o (1) load regulation i o = 5 ma to 1.5 a, t j = 25c 300 mv i o = 250 to 750 ma, t j = 25c 150 i d quiescent current t j = 25c 3 ma i d quiescent current change i o = 5 ma to 1 a 0.5 ma v i = -18.5 to -30 v 1 v o / t output voltage drift i o = 5 ma -0.9 mv/c en output noise voltage b = 10 hz to 100 khz, t j = 25c 250 v svr supply voltage rejection v i = 10 v, f = 120 hz 54 60 db v d dropout voltage i o = 1 a, t j = 25c, v o = 100 mv 1.1 v i sc short circuit current 1.3 a 1. load and line regulation are specified at cons tant junction temperature. changes in v o due to heating effects must be taken into account separately. pulse testing with low duty cycle is used.
application information L79 14/28 docid2149 rev 22 6 application information note: c i is required for stability. for value given, capacitor must be solid tantalum. if aluminium electrolytic are used, at least ten times value should be selected. c o is required if regulator is located an appreciable distance from power supply filter. to improve transient response. if large capacitors are used, a high current diode from input to output (1n4001 or similar) should be introduced to protect the device from momentary input short circuit. (*) against potential latch-up problems. figure 4. fixed output regulator figure 5. split power supply ( 15 v - 1 a)
docid2149 rev 22 15/28 L79 application information 28 c3 optional for improved transient response and ripple rejection. figure 6. circuit for increasing output voltage 9 ;; 5 !, g 9 2 9 ;; 5 5 5 1 ,1 , 7 7 8 8 2 2 ' ' 1 *1 * / figure 7. high current negative regulator (- 5 v / 4 a with 5 a current limiting) in out gnd in out gnd
package mechanical data L79 16/28 docid2149 rev 22 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. figure 8. to-220 (single gauge) drawing buhy'
docid2149 rev 22 17/28 L79 package mechanical data 28 table 11. to-220 (single gauge) mechanical data dim. mm min. typ. max. a 4.40 4.60 b 0.61 0.88 b1 1.14 1.70 c 0.48 0.70 d 15.25 15.75 e 10 10.40 e 2.40 2.70 e1 4.95 5.15 f 0.51 0.60 h1 6.20 6.60 j1 2.40 2.72 l13 14 l1 3.50 3.93 l20 16.40 l30 28.90 ? p 3.75 3.85 q 2.65 2.95
package mechanical data L79 18/28 docid2149 rev 22 figure 9. to-220 (dual gauge) drawing bw\sh$b5hyb7
docid2149 rev 22 19/28 L79 package mechanical data 28 table 12. to-220 (dual gauge) mechanical data dim. mm min. typ. max. a 4.40 4.60 b 0.61 0.88 b1 1.14 1.70 c 0.48 0.70 d 15.25 15.75 d1 1.27 e 10 10.40 e 2.40 2.70 e1 4.95 5.15 f 1.23 1.32 h1 6.20 6.60 j1 2.40 2.72 l13 14 l1 3.50 3.93 l20 16.40 l30 28.90 ? p 3.75 3.85 q 2.65 2.95
package mechanical data L79 20/28 docid2149 rev 22 figure 10. to-220fp drawing 7012510_rev_k a b h dia l7 d e l6 l5 l2 l3 l4 f1 f2 f g g1
docid2149 rev 22 21/28 L79 package mechanical data 28 table 13. to-220fp mechanical data dim. mm min. typ. max. a4.4 4.6 b2.5 2.7 d2.5 2.75 e 0.45 0.7 f0.75 1 f1 1.15 1.70 f2 1.15 1.70 g 4.95 5.2 g1 2.4 2.7 h10 10.4 l2 16 l3 28.6 30.6 l4 9.8 10.6 l5 2.9 3.6 l6 15.9 16.4 l7 9 9.3 dia 3 3.2
package mechanical data L79 22/28 docid2149 rev 22 figure 11. d2pak drawing 0079457_t
docid2149 rev 22 23/28 L79 package mechanical data 28 table 14. d2pak mechanical data dim. mm min. typ. max. a4.40 4.60 a1 0.03 0.23 b0.70 0.93 b2 1.14 1.70 c0.45 0.60 c2 1.23 1.36 d8.95 9.35 d1 7.50 e 10 10.40 e1 8.50 e2.54 e1 4.88 5.28 h 15 15.85 j1 2.49 2.69 l2.29 2.79 l1 1.27 1.40 l2 1.30 1.75 r0.4 v2 0 8
package mechanical data L79 24/28 docid2149 rev 22 figure 12. d2pak footprint (a) a. all dimensions are in millimeters. 16.90 12.20 9.75 3.50 5.08 1.60 footprint
docid2149 rev 22 25/28 L79 packaging mechanical data 28 8 packaging mechanical data figure 13. tape p1 a0 d1 p0 f w e d b0 k0 t user direction of feed p2 10 pitches cumulative tolerance on tape +/- 0.2 mm user direction of feed r bending radius b1 for machine ref. only including draft and radii concentric around b0 am08852v1 top cover tape
packaging mechanical data L79 26/28 docid2149 rev 22 figure 14. reel table 15. d2pak tape and reel mechanical data tape reel dim. mm dim. mm min. max. min. max. a0 10.5 10.7 a 330 b0 15.7 15.9 b 1.5 d 1.5 1.6 c 12.8 13.2 d1 1.59 1.61 d 20.2 e 1.65 1.85 g 24.4 26.4 f 11.4 11.6 n 100 k0 4.8 5.0 t 30.4 p0 3.9 4.1 p1 11.9 12.1 base qty 1000 p2 1.9 2.1 bulk qty 1000 r50 t 0.25 0.35 w 23.7 24.3 a d b full radius g measured at hub c n reel dimensions 40mm min. access hole at slot location t tape slot in core for tape start 25 mm min. width am08851v2
docid2149 rev 22 27/28 L79 revision history 28 9 revision history table 16. document revision history date revision changes 22-jun-2004 9 order codes updated table 3. 31-aug-2005 10 add new order codes (to-220 e type) on table 3. 19-jan-2007 11 d2pak mechanical data updated and add footprint data. 06-jun-2007 12 order codes updated. 25-oct-2007 13 modified: figure 3 , figure 4 , figure 6 and figure 7 . 05-dec-2007 14 modified: table 1 . 18-feb-2008 15 modified: table 1 on page 1 . 15-jul-2008 16 modified: table 1 on page 1 . 19-jan-2010 17 modified: table 11 on page 14 , added: figure 8 on page 16 , figure 9 on page 17 , figure 10 and figure 11 on page 18 . 26-may-2010 18 modified: v i parameter table 2 on page 5 . 12-nov-2010 19 modified: r thjc value for to-220 table 3 on page 5 . 18-nov-2011 20 added: order codes L7905cv-dg, L7912cv-dg and L7915cv-dg table 1 on page 1 . 15-may-2012 21 added: order codes L7908cv-dg table 1 on page 1 . 04-jun-2014 22 part numbers L79xxc and L79xxac changed to L79. updated the features and the description in cover page. updated table 1: device summary , section 3: maximum ratings , section 4: test circuit , section 5: electrical characteristics , section 6: application information , section 7: package mechanical data . added section 8: packaging mechanical data . minor text changes.
L79 28/28 docid2149 rev 22 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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