STMicroelectronics L7912AC Datasheet
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Features
■
■
■
■
■
Output current to 1.5 A
Output voltages of -5; -12; -15 V
Thermal overload protection
Short circuit protection
Output transition SOA protection
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.
L79xxAC
2 % negative voltage regulators
TO-220 D²PAK
Table 1.
Device summary Obsolete Product(s) - Obsolete Product(s)
Order codes
Output
Part numbers voltages
TO-220 D²PAK
L7905AC
L7912AC
L7915AC
L7905ACV
L7912ACV
L7915ACV
L7905ACV-DG
(1)
L7912ACV-DG
(1)
L7915ACV-DG
(1)
L7905ACD2T-TR -5 V
-12 V
-15 V
1.
TO-220 Dual Gauge frame.
February 2012 Doc ID 2150 Rev 13 1/22 www.st.com
22
Contents
Contents
L79xxAC
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Obsolete Product(s) - Obsolete Product(s)
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L79xxAC
1 Diagram
Figure 1.
Schematic diagram
Diagram
Obsolete Product(s) - Obsolete Product(s)
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Pin configuration
2 Pin configuration
Figure 2.
Pin connections (top view)
TO-220 D²PAK
L79xxAC
Obsolete Product(s) - Obsolete Product(s)
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L79xxAC Maximum ratings
Table 2.
Symbol
V
I
I
O
P
D
T
STG
T
OP
Absolute maximum ratings
Parameter
DC input voltage
Output current
Power dissipation
Storage temperature range
Operating junction temperature range for V
O
= -5 to -18V for V
O
= -20, -24V
Value
-35
-40
Internally limited
Internally limited
-65 to 150
0 to 125
Unit
V
°C
°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.
Symbol
R thJC
R thJA
Thermal data
Parameter
Thermal resistance junction-case
Thermal resistance junction-ambient
D²PAK
3
62.5
TO-220
5
50
Unit
°C/W
°C/W
Obsolete Product(s) - Obsolete Product(s)
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Application
4 Application
Figure 3.
Application circuit
L79xxAC
Obsolete Product(s) - Obsolete Product(s)
6/22 Doc ID 2150 Rev 13
L79xxAC Electrical characteristics
Refer to the test circuits, T
J
= 0 to 125 °C, V
I
= -10 V, I
O unless otherwise specified.
= 500 mA, C
I
= 2.2 µF, C
O
= 1 µF
Table 4.
Symbol
Electrical characteristics of L7905AC
Parameter Test conditions Min.
Typ.
Max.
Unit
Δ V
Δ V
Δ
V
V
V
Δ
I
O
O
O d
I
O
O
/ d eN
(1)
(1)
Δ
SVR
T
Output voltage
Output voltage
Line regulation
Load regulation
Quiescent current
Quiescent current change
Output voltage drift
Output noise voltage
Supply voltage rejection
T
J
= 25°C
I
O
= -5 mA to -1 A, P
O
≤ 15 W
V
I
= -8 to -20 V
V
I
= -7 to -25 V, T
J
= 25°C
V
I
= -8 to -12 V, T
J
= 25°C
I
O
= 5 mA to 1.5 A, T
J
= 25°C
I
O
= 250 to 750 mA, T
J
= 25°C
T
J
= 25°C
I
O
= 5 mA to 1 A
V
I
= -8 to -25 V
I
O
= 5 mA
B = 10Hz to 100kHz, T
J
= 25°C
Δ V
I
= 10 V, f = 120Hz
I
O
= 1 A, T
J
= 25°C, Δ V
O
= 100 mV
-4.9
-4.8
54
-5
-5
-0.4
100
60
-5.1
-5.2
100
50
100
50
3
0.5
1.3
V d
I sc
I scp
Dropout voltage
Short circuit current
1.4
2.1
Short circuit peak current T
J
= 25°C 2.5
1.
Load and line regulation are specified at constant junction temperature. Changes in V
O taken into account separately. Pulse testing with low duty cycle is used.
due to heating effects must be
V
V mV mV mA mA mV/°C
µV dB
V
A
A
Obsolete Product(s) - Obsolete Product(s)
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Electrical characteristics L79xxAC
Refer to the test circuits, T
J
= 0 to 125 °C, V
I
= -19 V, I
O unless otherwise specified.
= 500 mA, C
I
= 2.2 µF, C
O
= 1 µF
Table 5.
Symbol
Electrical characteristics of L7912AC
Parameter Test conditions Min.
Typ.
Max.
Unit
Δ V
Δ V
Δ
V
V
V
Δ
I
O
O
O d
I
O
O
/ d eN
(1)
(1)
Δ
SVR
T
Output voltage
Output voltage
Line regulation
Load regulation
Quiescent current
Quiescent current change
Output voltage drift
Output noise voltage
Supply voltage rejection
T
J
= 25°C
I
O
= -5 mA to -1 A, P
O
≤ 15 W
V
I
= -15.5 to -27 V
V
I
= -14.5 to -30 V, T
J
= 25°C
V
I
= -16 to -22 V, T
J
= 25°C
I
O
= 5 mA to 1.5 A, T
J
= 25°C
I
O
= 250 to 750 mA, T
J
= 25°C
T
J
= 25°C
I
O
= 5 mA to 1 A
V
I
= -15 to -30 V
I
O
= 5 mA
B = 10Hz to 100kHz, T
J
= 25°C
Δ
V
I
= 10 V, f = 120Hz
I
O
= 1 A, T
J
= 25°C, Δ V
O
= 100 mV
-11.75
-11.5
54
-12
-12
-0.8
200
60
-12.25
-12.5
240
120
240
120
3
0.5
1
V d
I sc
I scp
Dropout voltage
Short circuit current
1.1
1.5
Short circuit peak current T
J
= 25°C 2.5
1.
Load and line regulation are specified at constant junction temperature. Changes in V
O taken into account separately. Pulse testing with low duty cycle is used.
due to heating effects must be
V
V mV mV mA mA mV/°C
µV dB
V
A
A
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8/22 Doc ID 2150 Rev 13
L79xxAC Electrical characteristics
Refer to the test circuits, T
J
= 0 to 125 °C, V
I
= -23 V, I
O unless otherwise specified.
= 500 mA, C
I
= 2.2 µF, C
O
= 1 µF
Table 6.
Symbol
Electrical characteristics of L7915AC
Parameter Test conditions Min.
Typ.
Max.
Unit
Δ V
Δ V
Δ
V
V
V
Δ
I
O
O
O d
I
O
O
/ d eN
(1)
(1)
Δ
SVR
T
Output voltage
Output voltage
Line regulation
Load regulation
Quiescent current
Quiescent current change
Output voltage drift
Output noise voltage
Supply voltage rejection
T
J
= 25°C
I
O
= -5 mA to -1 A, P
O
≤ 15 W
V
I
= -18.5 to -30 V
V
I
= -17.5 to -30 V, T
J
= 25°C
V
I
= -20 to -26 V, T
J
= 25°C
I
O
= 5 mA to 1.5 A, T
J
= 25°C
I
O
= 250 to 750 mA, T
J
= 25°C
T
J
= 25°C
I
O
= 5 mA to 1 A
V
I
= -18.5 to -30 V
I
O
= 5 mA
B = 10Hz to 100kHz, T
J
= 25°C
Δ
V
I
= 10 V, f = 120Hz
I
O
= 1 A, T
J
= 25°C, Δ V
O
= 100 mV
-14.7
-14.4
54
-15
-15
-0.9
250
60
-15.3
-15.6
300
150
300
150
3
0.5
1
V d
I sc
I scp
Dropout voltage
Short circuit current
1.1
1.3
Short circuit peak current T
J
= 25°C 2.5
1.
Load and line regulation are specified at constant junction temperature. Changes in V
O taken into account separately. Pulse testing with low duty cycle is used.
due to heating effects must be
V
V mV mV mA mA mV/°C
µV dB
V
A
A
Obsolete Product(s) - Obsolete Product(s)
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Application information
Figure 4.
Fixed output regulator
L79xxAC
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.
Obsolete Product(s) - Obsolete Product(s)
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L79xxAC
Figure 6.
Circuit for increasing output voltage
Application information
V
O
=V
XX
(R
1
+R
2
)/R
2
V
XX
/R
2
> 3I d
C3 Optional for improved transient response and ripple rejection.
Figure 7.
High current negative regulator (-5 V / 4 A with 5 A current limiting)
Obsolete Product(s) - Obsolete Product(s)
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Package mechanical data
7 Package mechanical data
L79xxAC
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:
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.
mm.
mm.
Min.
Typ.
Max.
Min.
Typ.
Max.
A b b1 c
D
D1
E e e1
F
H1
J1
L
L1
4.40
0.61
1.14
0.48
15.25
10.00
2.40
4.95
1.23
6.20
2.40
13.00
3.50
1.27
4.60
0.88
1.70
0.70
15.75
10.40
2.70
5.15
1.32
6.60
2.72
14.00
3.93
4.40
0.61
1.14
0.48
15.25
10.00
2.40
4.95
0.51
6.20
2.40
13.00
3.50
4.60
0.88
1.70
0.70
15.75
10.40
2.70
5.15
0.60
6.60
2.72
14.00
3.93
L20 16.40
16.40
L30 28.90
28.90
∅
P 3.75
3.85
3.75
3.85
Obsolete Product(s) - Obsolete Product(s)
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
Figure 8.
Drawing dimension TO-220 (type STD-ST Dual Gauge)
Package mechanical data
Obsolete Product(s) - Obsolete Product(s)
0015988_S
13/22 Doc ID 2150 Rev 13
Package mechanical data
Figure 9.
Drawing dimension TO-220 (type STD-ST Single Gauge)
L79xxAC
Obsolete Product(s) - Obsolete Product(s)
8174627_B
14/22 Doc ID 2150 Rev 13
L79xxAC
Figure 10.
Drawing dimension tube for TO-220 Dual Gauge (mm.)
Package mechanical data
Figure 11.
Drawing dimension tube for TO-220 Single Gauge (mm.)
Obsolete Product(s) - Obsolete Product(s)
Doc ID 2150 Rev 13 15/22
Package mechanical data
Figure 12.
Drawing dimension D²PAK (type STD-ST)
L79xxAC
Obsolete Product(s) - Obsolete Product(s)
0079457/L
16/22 Doc ID 2150 Rev 13
L79xxAC
Figure 13.
Drawing dimension D²PAK (type WOOSEOK-subcon.)
Package mechanical data
Obsolete Product(s) - Obsolete Product(s)
0079457/L
17/22 Doc ID 2150 Rev 13
Package mechanical data L79xxAC
J1
L
L1
L2
R
V2
D1
E
E1 e e1
H
A
A1 b b2 c c2
D
Table 8.
Dim.
D²PAK mechanical data
Type STD-ST mm.
Typ.
Min.
4.40
0.03
0.70
1.14
0.45
1.23
8.95
7.50
10
8.50
2.54
4.88
15
2.49
2.29
1.27
1.30
0.4
0°
Note:
Max.
4.60
0.23
0.93
1.70
0.60
1.36
9.35
10.40
5.28
15.85
2.69
2.79
1.40
1.75
15
2.20
1.79
1
1.20
Min.
4.30
0
0.70
1.17
0.45
1.25
9
7.50
9.80
7.50
Type WOOSEOK-subcon.
mm.
Typ.
0.50
1.30
9.20
Max.
4.70
0.20
0.90
1.37
0.60
1.40
9.40
10.20
2.54
5.08
15.30
15.60
2.60
2.79
1.40
1.60
0.30
0° 3° 8°
The D²PAK package coming from the subcontractor WOOSEOK is fully compatible with the
ST's package suggested footprint.
Obsolete Product(s) - Obsolete Product(s)
18/22 Doc ID 2150 Rev 13
L79xxAC
Figure 14.
D²PAK footprint recommended data
Package mechanical data
Table 9.
Footprint data
Values
Dim.
mm.
inch.
A
B
C
12.20
9.75
16.90
0.480
0.384
0.665
D 3.50
0.138
E
F
1.60
2.54
0.063
0.100
G 5.08
0.200
Doc ID 2150 Rev 13 19/22
Package mechanical data L79xxAC
Dim.
N
T
Ao
A
C
D
Bo
Ko
Po
P
Tape & reel D
2
PAK-P
2
PAK-D
2
PAK/A-P
2
PAK/A mechanical data
Min.
mm.
Typ.
Min.
inch.
Typ.
12.
8
20.2
60
10.50
15.70
4.
8 0
3 .
9
11.
9
1 3 .0
10.6
15.
8 0
4.
9 0
4.0
12.0
Max.
1 8 0
1 3 .2
14.4
10.70
15.
9 0
5.00
4.1
12.1
0.504
0.7
9 5
2.
3 62
0.41
3
0.61
8
0.1
89
0.15
3
0.46
8
0.512
0.417
0.622
0.1
93
0.157
0.472
Max.
7.0
8 6
0.51
9
0.567
0.421
0.626
0.1
9 7
0.161
0.476
Obsolete Product(s) - Obsolete Product(s)
20/22 Doc ID 2150 Rev 13
L79xxAC
8 Revision history
Revision history
Table 10.
Document revision history
Date
22-Jun-2004
12-Dec-2007
18-Feb-2008
28-Jan-2010
12-Nov-2010
28-Nov-2011
09-Feb-2012
Revision
7
8
9
10
11
12
13
Changes
Order codes updated.
Added:
Modified:
.
Modified:
,
,
Figure 10 and Figure 11 on page 15
.
Modified: R thJC
value for TO-220
Added: order codes L7912ACV-DG and L7915ACV-DG Table 1 on page 1 .
Added: order code L7905ACV-DG
Obsolete Product(s) - Obsolete Product(s)
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L79xxAC
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