This is information on a product in full production.
June 2014 DocID2149 Rev 22 1/28
L79
Negative volt a ge regula t ors
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 25°C
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
(si ngle 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 L7912C V-DG L 79 12C D2T-TR L 791 2CP - 12 V
L7915ACV L7915ACV-DG - 15 V
L7915CV L7915C V-DG L7915C P - 15 V
www.st.com
Contents L79
2/28 DocID2149 R ev 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 diag ram
Pin configuration L79
4/28 DocID2149 R ev 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 R ev 22
4 Test circuit
Figure 3. Test circuit
DocID2149 Rev 22 7/28
L79 Electrical ch ara ct er istics
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 µF, C
O
= 1 µF
unless otherwise specified.
Table 4. Electrical characteristics of L7905AC
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
O
Output voltage T
J
= 25°C -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
ΔV
O(1)
Line regulation V
I
= -7 to -25 V, T
J
= 25°C 100 mV
V
I
= -8 to -12 V, T
J
= 25°C 50
ΔV
O(1)
Load regulation I
O
= 5 mA to 1.5 A, T
J
= 25°C 100 mV
I
O
= 250 to 750 mA, T
J
= 25°C 50
I
d
Quiescent current T
J
= 25°C 3 mA
ΔI
d
Quiescent current change I
O
= 5 mA to 1 A 0.5 mA
V
I
= -8 to -25 V 1.3
ΔV
O
/ΔT Output voltage drift I
O
= 5 mA -0.4 mV/°C
eN Output noise voltage B = 10 Hz to 100 kHz, T
J
= 25°C 100 µV
SVR Supply voltage rejection ΔV
I
= 10 V, f = 120 Hz 54 60 dB
V
d
Dropout voltage I
O
= 1 A, T
J
= 25°C, ΔV
O
= 100 mV 1.4 V
I
sc
Short circuit current 2.1 A
I
scp
Short circuit peak current T
J
= 25°C 2.5 A
1. Load and line regulation are specified 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.
Ele ctrical characteristics L79
8/28 DocID2149 R ev 22
Refer to the test circuits, T
J
= 0 to 125 °C, V
I
= -10 V, I
O
= 500 mA, C
I
= 2.2 µF, C
O
= 1 µF
unless otherwise specified.
Table 5. Electrical characteristics of L7905C
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
O
Output voltage T
J
= 25°C -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
ΔV
O(1)
Line regulation V
I
= -7 to -25 V, T
J
= 25°C 100 mV
V
I
= -8 to -12 V, T
J
= 25°C 50
ΔV
O(1)
Load regulation I
O
= 5 mA to 1.5 A, T
J
= 25°C 100 mV
I
O
= 250 to 750 mA, T
J
= 25°C 50
I
d
Quiescent current T
J
= 25°C 3 mA
ΔI
d
Quiescent current change I
O
= 5 mA to 1 A 0.5 mA
V
I
= -8 to -25 V 1.3
ΔV
O
/ΔT Output voltage drift I
O
= 5 mA -0.4 mV/°C
eN Output noise voltage B = 10 Hz to 100 kHz, T
J
= 25°C 100 µV
SVR Supply voltage rejection ΔV
I
= 10 V, f = 120 Hz 54 60 dB
V
d
Dropout voltage I
O
= 1 A, T
J
= 25°C, ΔV
O
= 100 mV 1.4 V
I
sc
Short circuit current 2.1 A
1. Load and line regulation are specified 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.
DocID2149 Rev 22 9/28
L79 Electrical ch ara ct er istics
28
Refer to the test circuits, T
J
= 0 to 125 °C, V
I
= -14 V, I
O
= 500 mA, C
I
= 2.2 µF, C
O
= 1 µF
unless otherwise specified.
Table 6. Electrical characteristics of L7908C
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
O
Output voltage T
J
= 25°C -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
ΔV
O(1)
Line regulation V
I
= -10.5 to -25 V, T
J
= 25°C 160 mV
V
I
= -11 to -17 V, T
J
= 25°C 80
ΔV
O(1)
Load regulation I
O
= 5 mA to 1.5 A, T
J
= 25°C 160 mV
I
O
= 250 to 750 mA, T
J
= 25°C 80
I
d
Quiescent current T
J
= 25°C 3 mA
ΔI
d
Quiescent current change I
O
= 5 mA to 1 A 0.5 mA
V
I
= -11.5 to -25 V 1
ΔV
O
/ΔT Output voltage drift I
O
= 5 mA -0.6 mV/°C
eN Output noise voltage B = 10 Hz to 100 kHz, T
J
= 25°C 175 µV
SVR Supply voltage rejection ΔV
I
= 10 V, f = 120 Hz 54 60 dB
V
d
Dropout voltage I
O
= 1 A, T
J
= 25°C, ΔV
O
= 100 mV 1.1 V
I
sc
Short circuit current 1.5 A
1. Load and line regulation are specified 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.
Ele ctrical 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 µF, C
O
= 1 µF
unless otherwise specified.
Table 7. Electrical characteristics of L7912AC
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
O
Output voltage T
J
= 25°C -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
ΔV
O(1)
Line regulation V
I
= -14.5 to -30 V, T
J
= 25°C 240 mV
V
I
= -16 to -22 V, T
J
= 25°C 120
ΔV
O(1)
Load regulation I
O
= 5 mA to 1.5 A, T
J
= 25°C 240 mV
I
O
= 250 to 750 mA, T
J
= 25°C 120
I
d
Quiescent current T
J
= 25°C 3 mA
ΔI
d
Quiescent current change I
O
= 5 mA to 1 A 0.5 mA
V
I
= -15 to -30 V 1
ΔV
O
/ΔT Output voltage drift I
O
= 5 mA -0.8 mV/°C
eN Output noise voltage B = 10 Hz to 100 kHz, T
J
= 25°C 200 µV
SVR Supply voltage rejection ΔV
I
= 10 V, f = 120 Hz 54 60 dB
V
d
Dropout voltage I
O
= 1 A, T
J
= 25°C, ΔV
O
= 100 mV 1.1 V
I
sc
Short circuit current 1.5 A
I
scp
Short circuit peak current T
J
= 25°C 2.5 A
1. Load and line regulation are specified 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.
DocID2149 Rev 22 11/28
L79 Electrical ch ara ct er istics
28
Refer to the test circuits, T
J
= 0 to 125 °C, V
I
= -19 V, I
O
= 500 mA, C
I
= 2.2 µF, C
O
= 1 µF
unless otherwise specified.
Table 8. Electrical characteristics of L7912C
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
O
Output voltage T
J
= 25°C -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
ΔV
O(1)
Line regulation V
I
= -14.5 to -30 V, T
J
= 25°C 240 mV
V
I
= -16 to -22 V, T
J
= 25°C 120
ΔV
O(1)
Load regulation I
O
= 5 mA to 1.5 A, T
J
= 25°C 240 mV
I
O
= 250 to 750 mA, T
J
= 25°C 120
I
d
Quiescent current T
J
= 25°C 3 mA
ΔI
d
Quiescent current change I
O
= 5 mA to 1 A 0.5 mA
V
I
= -15 to -30 V 1
ΔV
O
/ΔT Output voltage drift I
O
= 5 mA -0.8 mV/°C
eN Output noise voltage B = 10 Hz to 100 kHz, T
J
= 25°C 200 µV
SVR Supply voltage rejection ΔV
I
= 10 V, f = 120Hz 54 60 dB
V
d
Dropout voltage I
O
= 1 A, T
J
= 25°C, ΔV
O
= 100 mV 1.1 V
I
sc
Short circuit current 1.5 A
1. Load and line regulation are specified 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.
Ele ctrical 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 µF, C
O
= 1 µF
unless otherwise specified.
Table 9. Electrical characteristics of L7915AC
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
O
Output voltage T
J
= 25°C -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
ΔV
O(1)
Line regulation V
I
= -17.5 to -30 V, T
J
= 25°C 300 mV
V
I
= -20 to -26 V, T
J
= 25°C 150
ΔV
O(1)
Load regulation I
O
= 5 mA to 1.5 A, T
J
= 25°C 300 mV
I
O
= 250 to 750 mA, T
J
= 25°C 150
I
d
Quiescent current T
J
= 25°C 3 mA
ΔI
d
Quiescent current change I
O
= 5 mA to 1 A 0.5 mA
V
I
= -18.5 to -30 V 1
ΔV
O
/ΔT Output voltage drift I
O
= 5 mA -0.9 mV/°C
eN Output noise voltage B = 10 Hz to 100 kHz, T
J
= 25°C 250 µV
SVR Supply voltage rejection ΔV
I
= 10 V, f = 120 Hz 54 60 dB
V
d
Dropout voltage I
O
= 1 A, T
J
= 25°C, ΔV
O
= 100 mV 1.1 V
I
sc
Short circuit current 1.3 A
I
scp
Short circuit peak current T
J
= 25°C 2.5 A
1. Load and line regulation are specified 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.
DocID2149 Rev 22 13/28
L79 Electrical ch ara ct er istics
28
Refer to the test circuits, T
J
= 0 to 125 °C, V
I
= -23 V, I
O
= 500 mA, C
I
= 2.2 µF, C
O
= 1 µF
unless otherwise specified.
Table 10. Electrical characteristics of L7915C
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
O
Output voltage T
J
= 25°C -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
ΔV
O(1)
Line regulation V
I
= -17.5 to -30 V, T
J
= 25°C 300 mV
V
I
= -20 to -26 V, T
J
= 25°C 150
ΔV
O(1)
Load regulation I
O
= 5 mA to 1.5 A, T
J
= 25°C 300 mV
I
O
= 250 to 750 mA, T
J
= 25°C 150
I
d
Quiescent current T
J
= 25°C 3 mA
ΔI
d
Quiescent current change I
O
= 5 mA to 1 A 0.5 mA
V
I
= -18.5 to -30 V 1
ΔV
O
/ΔT Output voltage drift I
O
= 5 mA -0.9 mV/°C
eN Output noise voltage B = 10 Hz to 100 kHz, T
J
= 25°C 250 µV
SVR Supply voltage rejection ΔV
I
= 10 V, f = 120 Hz 54 60 dB
V
d
Dropout voltage I
O
= 1 A, T
J
= 25°C, ΔV
O
= 100 mV 1.1 V
I
sc
Short circuit current 1.3 A
1. Load and line regulation are specified 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 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 increasi ng output voltage
9;;5!,G
92 9;;555
1,1, 778822
''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
Packagi ng mechan ic al data L79
26/28 DocID2149 Rev 22
Figure 14. Reel
Table 15. D²PAK ta pe 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 Figur e 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 cod es L 790 5CV-DG, L7912 C V-DG and L7 915 CV-DG Table 1 on
page 1.
15-May-2012 21 Added: order codes L7908CV-DG Ta bl e 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 summ ar y , Section 3: Maximum rat ings, Section 4:
Test circuit, Section 5: Electric al charac te ris tics, Section 6: Applicati on
information, Section 7: Package mechanical data.
Added Section 8: Packaging mechanical data.
Minor text changes.
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