Features
■ Output current to 1.5 A
■ Output voltages of -5; -12; -15 V
■ Thermal overload protection
■ Short circuit protection
■ Output transition SOA protection
L79xxAC
2 % negative voltage regulators
Description
The L79xxAC series of three-terminal negative
regulators is available in TO-220 and D²PAK
packages and several fixed output voltages.
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 L78xxA 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.
Table 1. Device summary
TO-220
D²PAK
Order codes
Part numbers
TO-220 D²PAK
L7905AC L7905ACV L7905ACV-DG
L7912AC L7912ACV L7912ACV-DG
L7915AC L7915ACV L7915ACV-DG
1. TO-220 Dual Gauge frame.
February 2012 Doc ID 2150 Rev 13 1/22
(1)
(1)
(1)
L7905ACD2T-TR -5 V
Output
voltages
-12 V
-15 V
www.st.com
22
Contents L79xxAC
Contents
1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2/22 Doc ID 2150 Rev 13
L79xxAC Diagram
1 Diagram
Figure 1. Schematic diagram
Doc ID 2150 Rev 13 3/22
Pin configuration L79xxAC
2 Pin configuration
Figure 2. Pin connections (top view)
TO-220
D²PAK
4/22 Doc ID 2150 Rev 13
L79xxAC Maximum ratings
3 Maximum ratings
Table 2. Absolute maximum ratings
Symbol Parameter Value Unit
for V
= -5 to -18V -35
O
= -20, -24V -40
for V
O
V
T
P
T
V
I
STG
OP
DC input voltage
I
Output current Internally limited
O
Power dissipation Internally limited
D
Storage temperature range -65 to 150 °C
Operating junction temperature range 0 to 125 °C
Note: Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied.
Table 3. Thermal data
Symbol Parameter D²PAK TO-220 Unit
R
R
thJC
thJA
Thermal resistance junction-case 3 5 °C/W
Thermal resistance junction-ambient 62.5 50 °C/W
Doc ID 2150 Rev 13 5/22
Application L79xxAC
4 Application
Figure 3. Application circuit
6/22 Doc ID 2150 Rev 13
L79xxAC Electrical characteristics
5 Electrical characteristics
Refer to the test circuits, TJ = 0 to 125 °C, VI = -10 V, IO = 500 mA, CI = 2.2 µF, CO = 1 µF
unless otherwise specified.
Table 4. Electrical characteristics of L7905AC
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
V
ΔV
ΔV
ΔI
ΔV
eN Output noise voltage B = 10Hz to 100kHz, T
Output voltage TJ = 25°C -4.9 -5 -5.1 V
O
= -5 mA to -1 A, PO ≤ 15 W
I
Output voltage
O
(1)
Line regulation
O
(1)
Load regulation
O
I
Quiescent current TJ = 25°C 3 mA
d
Quiescent current change
d
/ΔT Output voltage drift IO = 5 mA -0.4 mV/°C
O
O
= -8 to -20 V
V
I
V
= -7 to -25 V, TJ = 25°C 100
I
= -8 to -12 V, TJ = 25°C 50
V
I
= 5 mA to 1.5 A, TJ = 25°C 100
I
O
-4.8 -5 -5.2 V
IO = 250 to 750 mA, TJ = 25°C 50
I
= 5 mA to 1 A 0.5
O
VI = -8 to -25 V 1.3
= 25°C 100 µV
J
SVR Supply voltage rejection ΔVI = 10 V, f = 120Hz 54 60 dB
V
I
I
1. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be
taken into account separately. Pulse testing with low duty cycle is used.
Dropout voltage IO = 1 A, TJ = 25°C, ΔVO = 100 mV 1.4 V
d
Short circuit current 2.1 A
sc
Short circuit peak current TJ = 25°C 2.5 A
scp
mV
mV
mA
Doc ID 2150 Rev 13 7/22
Electrical characteristics L79xxAC
Refer to the test circuits, TJ = 0 to 125 °C, VI = -19 V, IO = 500 mA, CI = 2.2 µF, CO = 1 µF
unless otherwise specified.
Table 5. Electrical characteristics of L7912AC
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
V
ΔV
ΔV
ΔI
ΔV
Output voltage TJ = 25°C -11.75 -12 -12.25 V
O
Output voltage
O
(1)
Line regulation
O
(1)
Load regulation
O
I
Quiescent current TJ = 25°C 3 mA
d
Quiescent current change
d
/ΔT Output voltage drift IO = 5 mA -0.8 mV/°C
O
IO = -5 mA to -1 A, PO ≤ 15 W
V
= -15.5 to -27 V
I
V
= -14.5 to -30 V, TJ = 25°C 240
I
= -16 to -22 V, TJ = 25°C 120
V
I
I
= 5 mA to 1.5 A, TJ = 25°C 240
O
= 250 to 750 mA, TJ = 25°C 120
I
O
I
= 5 mA to 1 A 0.5
O
= -15 to -30 V 1
V
I
-11.5 -12 -12.5 V
eN Output noise voltage B = 10Hz to 100kHz, TJ = 25°C 200 µV
SVR Supply voltage rejection ΔV
V
I
I
1. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be
taken into account separately. Pulse testing with low duty cycle is used.
Dropout voltage IO = 1 A, TJ = 25°C, ΔVO = 100 mV 1.1 V
d
Short circuit current 1.5 A
sc
Short circuit peak current TJ = 25°C 2.5 A
scp
= 10 V, f = 120Hz 54 60 dB
I
mV
mV
mA
8/22 Doc ID 2150 Rev 13
L79xxAC Electrical characteristics
Refer to the test circuits, TJ = 0 to 125 °C, VI = -23 V, IO = 500 mA, CI = 2.2 µF, CO = 1 µF
unless otherwise specified.
Table 6. Electrical characteristics of L7915AC
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
V
ΔV
ΔV
ΔI
ΔV
Output voltage TJ = 25°C -14.7 -15 -15.3 V
O
Output voltage
O
(1)
Line regulation
O
(1)
Load regulation
O
I
Quiescent current TJ = 25°C 3 mA
d
Quiescent current change
d
/ΔT Output voltage drift IO = 5 mA -0.9 mV/°C
O
IO = -5 mA to -1 A, PO ≤ 15 W
V
= -18.5 to -30 V
I
V
= -17.5 to -30 V, TJ = 25°C 300
I
= -20 to -26 V, TJ = 25°C 150
V
I
I
= 5 mA to 1.5 A, TJ = 25°C 300
O
= 250 to 750 mA, TJ = 25°C 150
I
O
I
= 5 mA to 1 A 0.5
O
= -18.5 to -30 V 1
V
I
-14.4 -15 -15.6 V
eN Output noise voltage B = 10Hz to 100kHz, TJ = 25°C 250 µV
SVR Supply voltage rejection ΔV
V
I
I
1. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be
taken into account separately. Pulse testing with low duty cycle is used.
Dropout voltage IO = 1 A, TJ = 25°C, ΔVO = 100 mV 1.1 V
d
Short circuit current 1.3 A
sc
Short circuit peak current TJ = 25°C 2.5 A
scp
= 10 V, f = 120Hz 54 60 dB
I
mV
mV
mA
Doc ID 2150 Rev 13 9/22
Application information L79xxAC
6 Application information
Figure 4. Fixed output regulator
1. To specify an output voltage, substitute voltage value for "XX".
2. Required for stability. For value given, capacitor must be solid tantalum. If aluminium electrolytic are used,
at least ten times value should be selected. 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 introduced to protect the device from momentary input short circuit.
Figure 5. Split power supply (± 15 V - 1 A)
(*) Against potential latch-up problems.
10/22 Doc ID 2150 Rev 13
L79xxAC Application information
Figure 6. Circuit for increasing output voltage
VO=VXX(R1+R2)/R
VXX/R2 > 3I
2
IN OUT
d
C3 Optional for improved transient response and ripple rejection.
IN OUT
GND
GND
Figure 7. High current negative regulator (-5 V / 4 A with 5 A current limiting)
IN
IN
GND
GND
OUT
OUT
Doc ID 2150 Rev 13 11/22
Package mechanical data L79xxAC
7 Package mechanical data
In order to meet environmental requirements, ST offers these devices in different grades of
®
ECOPACK
specifications, grade definitions and product status are available at:
ECOPACK
packages, depending on their level of environmental compliance. ECOPACK®
®
is an ST trademark.
www.st.com
Table 7. TO-220 mechanical data
Type STD - ST Dual Gauge Type STD - ST Single Gauge
Dim.
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
mm. mm.
.
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
Note: In spite of some difference in tolerances, the packages are compatible.
12/22 Doc ID 2150 Rev 13
L79xxAC Package mechanical data
Figure 8. Drawing dimension TO-220 (type STD-ST Dual Gauge)
0015988_S
Doc ID 2150 Rev 13 13/22
Package mechanical data L79xxAC
Figure 9. Drawing dimension TO-220 (type STD-ST Single Gauge)
14/22 Doc ID 2150 Rev 13
8174627_B
L79xxAC Package mechanical data
Figure 10. Drawing dimension tube for TO-220 Dual Gauge (mm.)
Figure 11. Drawing dimension tube for TO-220 Single Gauge (mm.)
Doc ID 2150 Rev 13 15/22
Package mechanical data L79xxAC
Figure 12. Drawing dimension D²PAK (type STD-ST)
16/22 Doc ID 2150 Rev 13
0079457/L
L79xxAC Package mechanical data
Figure 13. Drawing dimension D²PAK (type WOOSEOK-subcon.)
0079457/L
Doc ID 2150 Rev 13 17/22
Package mechanical data L79xxAC
Table 8. D²PAK mechanical data
Type STD-ST Type WOOSEOK-subcon.
Dim.
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
mm. mm.
L2 1.30 1.75 1.20 1.60
R0.4 0.30
V2 0° 8° 0° 3°
Note: The D²PAK package coming from the subcontractor WOOSEOK is fully compatible with the
ST's package suggested footprint.
18/22 Doc ID 2150 Rev 13
L79xxAC Package mechanical data
Figure 14. D²PAK footprint recommended data
Table 9. Footprint data
Dim. mm. inch.
A 12.20 0.480
B 9.75 0.384
C 16.90 0.665
D 3.50 0.138
E 1.60 0.063
F 2.54 0.100
G 5.08 0.200
Val ues
Doc ID 2150 Rev 13 19/22
Package mechanical data L79xxAC
Tape & reel D2PAK-P2PAK-D2PAK/A-P2PAK/A mechanical data
Dim.
Min. Typ. Max. Min. Typ. Max.
A180 7.086
C 12.8 13.0 13.2 0.504 0.512 0.519
D 20.2 0.795
N60 2.362
T 14.4 0.567
Ao 10.50 10.6 10.70 0.413 0.417 0.421
Bo 15.70 15.80 15.90 0.618 0.622 0.626
Ko 4.804.90 5.00 0.189 0.193 0.197
Po 3.9 4.0 4.1 0.153 0.157 0.161
P 11.9 12.0 12.1 0.468 0.472 0.476
mm. inch.
20/22 Doc ID 2150 Rev 13
L79xxAC Revision history
8 Revision history
Table 10. Document revision history
Date Revision Changes
22-Jun-2004 7 Order codes updated.
12-Dec-2007 8 Added:
18-Feb-2008 9 Modified:
28-Jan-2010 10
12-Nov-2010 11 Modified: R
28-Nov-2011 12 Added: order codes L7912ACV-DG and L7915ACV-DG
09-Feb-2012 13 Added: order code L7905ACV-DG
Modified:
Figure 10
Ta bl e 1
.
Table 1 on page 1
Table 7 on page 12, Figure 8 on page 13, Figure 9 on page 14
and
Figure 11 on page 15
value for TO-220
thJC
.
.
Table 3 on page 5
Table 1 on page 1
.
.
Table 1 on page 1
,
.
Doc ID 2150 Rev 13 21/22
L79xxAC
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 herein 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 assumes 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. If 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 whatsoever 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.
UNLESS EXPRESSLY APPROVED IN WRITING BY TWO AUTHORIZED ST REPRESENTATIVES, ST PRODUCTS ARE NOT
RECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, 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 whatsoever, 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.
© 2012 STMicroelectronics - All rights reserved
STMicroelectronics group of companies
Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan -
Malaysia - Malta - Morocco - Philippines - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America
www.st.com
22/22 Doc ID 2150 Rev 13
Loading...