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may 2010 doc id 2149 rev 18 1/25 25 l79xxc negative voltage regulators features output current up to 1.5 a output voltages of -5; -8; -12; -15; -20 v thermal overload protection short circuit protection output transition soa protection description the l79xxc 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 regula tors can provide local on-card regulation, eliminating the distribution problems associated with single point regulation; furthermore, having the same voltage option as the l78xx 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-220fp d2pak to-220 table 1. device summary part numbers order codes output voltages to-220 (a type) d2pak to-220fp l7905c l7905cv l7905cd2t-tr L7905CP -5 v l7908c l7908cv -8 v l7912c l7912cv l7912cd2t-tr l7912cp -12 v l7915c l7915cv l7915cd2t-tr l7915cp -15 v l7920c l7920cd2t-tr (1) -20 v 1. available on request. www.st.com
contents l79xxc 2/25 doc id 2149 rev 18 contents 1 diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 6 application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 8 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
l79xxc diagram doc id 2149 rev 18 3/25 1 diagram figure 1. schematic diagram
pin configuration l79xxc 4/25 doc id 2149 rev 18 2 pin configuration figure 2. pin connections (top view) to220fp to-220 d2pak (any type)
l79xxc maximum ratings doc id 2149 rev 18 5/25 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 for v o = - 5 to - 18 v -35 v for v o = - 20 to - 24 v -40 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 0 to 150 c table 3. thermal data symbol parameter d2pak to-220 to-220fp unit r thjc thermal resistance junction-case 3 3 5 c/w r thja thermal resistance junction-ambient 62.5 50 60 c/w
test circuit l79xxc 6/25 doc id 2149 rev 18 4 test circuit figure 3. test circuit
l79xxc electrical characteristics doc id 2149 rev 18 7/25 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 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 = 10hz to 100khz, t j = 25c 100 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 1.4 v i sc short circuit current 2.1 a 1. load and line regulation are spec ified at constant 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 l79xxc 8/25 doc id 2149 rev 18 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 5. 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 = 10hz to 100khz, t j = 25c 175 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 spec ified at constant junction temperature. changes in v o due to heating effects must be taken into account separately. pulse testing with low duty cycle is used.
l79xxc electrical characteristics doc id 2149 rev 18 9/25 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 6. 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 = 10hz to 100khz, 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 spec ified at constant 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 l79xxc 10/25 doc id 2149 rev 18 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 7. 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 = 10hz to 100khz, t j = 25c 250 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 1.3 a 1. load and line regulation are spec ified at constant junction temperature. changes in v o due to heating effects must be taken into account separately. pulse testing with low duty cycle is used.
l79xxc electrical characteristics doc id 2149 rev 18 11/25 refer to the test circuits, t j = 0 to 125 c, v i = -29 v, i o = 500 ma, c i = 2.2 f, c o = 1 f unless otherwise specified. table 8. electrical characteristics of l7920c symbol parameter test conditions min. typ. max. unit v o output voltage t j = 25c -19.2 -20 -20.8 v v o output voltage i o = -5 ma to -1 a, p o 15 w v i = -24 to -35 v -19 -20 -21 v v o (1) line regulation v i = -23 to -35 v, t j = 25c 400 mv v i = -26 to -32 v, t j = 25c 200 v o (1) load regulation i o = 5 ma to 1.5 a, t j = 25c 400 mv i o = 250 to 750 ma, t j = 25c 200 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 = -24 to -35 v 1 v o / t output voltage drift i o = 5 ma -1.1 mv/c en output noise voltage b = 10hz to 100khz, t j = 25c 350 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 0.9 a 1. load and line regulation are spec ified at constant 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 l79xxc 12/25 doc id 2149 rev 18 6 application information 1. to specify an output voltage, substitute voltage value for "xx". 2. required for stability. for value give n, capacitor must be solid tantalum. if aluminium electr olytic are used, at least ten times value should be sele cted. c1 is required if regulator is located an appreciable distance from power supply filter. 3. to improve transient response. if large capacitors are used, a high current diode from input to output (1n4001 or similar) should be intr oduced to protect the dev ice from momentary input short circuit. (*) against potential latch-up problems. figure 4. fixed output regulator figure 5. split power supply ( 15 v - 1 a)
l79xxc application information doc id 2149 rev 18 13/25 c3 optional for improved transient response and ripple rejection. figure 6. circuit for increasing output voltage v xx /r 2 > 3i d v o =v xx (r 1 +r 2 )/r 2 in out gnd in out gnd figure 7. high current negative regulator (-5 v / 4 a with 5 a current limiting) in out gnd in out gnd
package mechanical data l79xxc 14/25 doc id 2149 rev 18 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. in spite of some difference in tolerances, the packages are compatible. table 9. to-220 mechanical data dim. type std - st dual gauge t ype std - st single gauge mm. mm. min. typ. max. min. typ. max. a 4.40 4.60 4.40 4.60 b 0.61 0.88 0.61 0.88 b1 1.14 1.70 1.14 1.70 c 0.48 0.70 0.48 0.70 d 15.25 15.75 15.25 15.75 d1 1.27 e 10.00 10.40 10.00 10.40 e 2.40 2.70 2.40 2.70 e1 4.95 5.15 4.95 5.15 f 1.23 1.32 0.51 0.60 h1 6.20 6.60 6.20 6.60 j1 2.40 2.72 2.40 2.72 l 13.00 14.00 13.00 14.00 l1 3.50 3.93 3.50 3.93 l20 16.40 16.40 l30 28.90 28.90 ? p 3.75 3.85 3.75 3.85 q 2.65 2.95 2.65 2.95
l79xxc package mechanical data doc id 2149 rev 18 15/25 figure 8. drawing dimension to-220 (type std-st dual gauge) 0015988_s
package mechanical data l79xxc 16/25 doc id 2149 rev 18 figure 9. drawing dimension to-220 (type std-st single gauge) 8174627_b
l79xxc package mechanical data doc id 2149 rev 18 17/25 figure 10. drawing dimension tube for to-220 dual gauge (mm) figure 11. drawing dimension tube for to-220 single gauge (mm)
package mechanical data l79xxc 18/25 doc id 2149 rev 18 dim. mm. inch. min. typ max. min. typ. max. a 4.40 4.60 0.17 3 0.1 8 1 b 2.5 2.7 0.0 98 0.106 d 2.5 2.75 0.0 98 0.10 8 e 0.45 0.70 0.017 0.027 f 0.75 1 0.0 3 00.0 39 f1 1.15 1.50 0.045 0.05 9 f2 1.15 1.50 0.045 0.05 9 g4. 9 5 5.2 0.1 9 4 0.204 g1 2.4 2.7 0.0 9 4 0.106 h 10.0 10.40 0. 393 0.40 9 l2 16 0.6 3 0 l 3 2 8 .6 3 0.6 1.126 1.204 l4 9 . 8 10.6 0. 38 50.417 l5 2. 93 .6 0.114 0.142 l6 15. 9 16.4 0.626 0.645 l7 99 . 3 0. 3 54 0. 3 66 dia. 33 .2 0.11 8 0.126 to-220fp mechanical data 7012510a- h
l79xxc package mechanical data doc id 2149 rev 18 19/25 figure 12. drawing dimension d2pak (type std-st) 0079457/l
package mechanical data l79xxc 20/25 doc id 2149 rev 18 figure 13. drawing dimension d2pak (type wooseok-subcon.) 0079457/l
l79xxc package mechanical data doc id 2149 rev 18 21/25 note: the d2pak package coming from the subcon tractor wooseok is fully compatible with the st's package suggested footprint. table 10. d2pak mechanical data dim. type std-st type wooseok-subcon. mm. mm. min. typ. max. min. typ. max. a 4.40 4.60 4.30 4.70 a1 0.03 0.23 0 0.20 b 0.70 0.93 0.70 0.90 b2 1.14 1.70 1.17 1.37 c 0.45 0.60 0.45 0.50 0.60 c2 1.23 1.36 1.25 1.30 1.40 d 8.95 9.35 9 9.20 9.40 d1 7.50 7.50 e 10 10.40 9.80 10.20 e1 8.50 7.50 e2.54 2.54 e1 4.88 5.28 5.08 h 15 15.85 15 15.30 15.60 j1 2.49 2.69 2.20 2.60 l 2.29 2.79 1.79 2.79 l1 1.27 1.40 1 1.40 l2 1.30 1.75 1.20 1.60 r 0.4 0.30 v2 0 8 0 3
package mechanical data l79xxc 22/25 doc id 2149 rev 18 figure 14. d2pak footprint recommended data table 11. footprint data values dim. mm. inch. a 12.20 0.480 b9.750.384 c 16.90 0.665 d3.500.138 e1.600.063 f2.540.100 g5.080.200
l79xxc package mechanical data doc id 2149 rev 18 23/25 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 10.50 10.6 10.70 0.41 3 0.417 0.421 bo 15.70 15. 8 0 15. 9 0 0.61 8 0.622 0.626 ko 4. 8 04. 9 0 5.00 0.1 89 0.1 93 0.1 9 7 po 3 . 9 4.0 4.1 0.15 3 0.157 0.161 p 11. 9 12.0 12.1 0.46 8 0.472 0.476 tape & reel d 2 pak-p 2 pak-d 2 pak/a-p 2 pak/a mechanical data
revision history l79xxc 24/25 doc id 2149 rev 18 8 revision history table 12. 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: ta b l e 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 9 on page 14 , added: figure 8 on page 15 , figure 9 on page 16 , figure 10 and figure 11 on page 17 . 26-may-2010 18 modified: v i parameter table 2 on page 5 .
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