L79XXAC [STMICROELECTRONICS]
2 % negative voltage regulatorsm; 2 ％的负电压regulatorsm
| 型号： | L79XXAC |
| 厂家： | 
ST |
| 描述： | 2 % negative voltage regulatorsm |
| 文件： | 总20页 (文件大小：749K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
L79xxAC
2 % negative voltage regulators
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
D2PAK
TO-220
The L79xxAC series of three-terminal negative
2
regulators is available in TO-220 and D PAK
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
Order codes
Part numbers
Output voltages
TO-220
D2PAK
L7905AC
L7912AC
L7915AC
L7905ACV
L7912ACV
L7915ACV
L7905ACD2T-TR
L7912ACD2T-TR
-5 V
-12 V
-15 V
February 2008
Rev 9
1/20
www.st.com
20
Contents
L79xxAC
Contents
1
2
3
4
5
6
7
8
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2/20
L79xxAC
1
Diagram
Diagram
Figure 1.
Schematic diagram
3/20
Pin configuration
L79xxAC
2
Pin configuration
Figure 2.
Pin connections (top view)
D2PAK
TO-220
4/20
L79xxAC
Maximum ratings
3
Maximum ratings
Table 2.
Symbol
Absolute maximum ratings
Parameter
Value
Unit
for VO= -5 to -18V
for VO= -20, -24V
-35
-40
VI
DC input voltage
V
IO
PD
Output current
Internally limited
Internally limited
-65 to 150
Power dissipation
TSTG
TOP
Storage temperature range
Operating junction temperature range
°C
°C
0 to 125
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
Thermal data
Parameter
D2PAK
TO-220
Unit
RthJC
RthJA
Thermal resistance junction-case
Thermal resistance junction-ambient
3
3
°C/W
°C/W
62.5
50
5/20
Application
4
L79xxAC
Application
Figure 3.
Application circuit
6/20
L79xxAC
5
Electrical characteristics
Electrical characteristics
Table 4.
Electrical characteristics of L7905AC (refer to the test circuits, T = 0 to 125 °C, V = -10
J I
V, I = 500 mA, C = 2.2 µF, C = 1 µF unless otherwise specified)
O
I
O
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
VO
Output voltage
Output voltage
TJ = 25°C
-4.9
-5
-5.1
V
IO = -5 mA to -1 A, PO ≤15 W
VI = -8 to -20 V
VO
-4.8
-5
-5.2
V
VI = -7 to -25 V, TJ = 25°C
VI = -8 to -12 V, TJ = 25°C
100
50
(1)
ΔVO
Line regulation
mV
I
O = 5 mA to 1.5 A, TJ = 25°C
100
50
(1)
ΔVO
Load regulation
mV
mA
mA
IO = 250 to 750 mA, TJ = 25°C
TJ = 25°C
Id
Quiescent current
3
IO = 5 mA to 1 A
0.5
1.3
ΔId
Quiescent current change
VI = -8 to -25 V
ΔVO/ΔT Output voltage drift
IO = 5 mA
-0.4
100
60
mV/°C
µV
dB
V
eN
SVR
Vd
Output noise voltage
Supply voltage rejection
Dropout voltage
B = 10Hz to 100kHz, TJ = 25°C
ΔVI = 10 V, f = 120Hz
IO = 1 A, TJ = 25°C, ΔVO = 100 mV
54
1.4
2.1
2.5
Isc
Short circuit current
A
Iscp
Short circuit peak current TJ = 25°C
A
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.
7/20
Electrical characteristics
L79xxAC
Table 5.
Electrical characteristics of L7912AC (refer to the test circuits, T = 0 to 125 °C, V = -19
J I
V, I = 500 mA, C = 2.2 µF, C = 1 µF unless otherwise specified)
O
I
O
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
VO
Output voltage
Output voltage
TJ = 25°C
-11.75
-11.5
-12
-12.25
V
IO = -5 mA to -1 A, PO ≤15 W
VI = -15.5 to -27 V
VO
-12
-12.5
V
VI = -14.5 to -30 V, TJ = 25°C
VI = -16 to -22 V, TJ = 25°C
240
120
240
120
3
(1)
ΔVO
Line regulation
mV
I
O = 5 mA to 1.5 A, TJ = 25°C
(1)
ΔVO
Load regulation
mV
mA
mA
IO = 250 to 750 mA, TJ = 25°C
TJ = 25°C
Id
Quiescent current
I
O = 5 mA to 1 A
0.5
1
ΔId
Quiescent current change
VI = -15 to -30 V
ΔVO/ΔT Output voltage drift
IO = 5 mA
-0.8
200
60
mV/°C
µV
dB
V
eN
SVR
Vd
Output noise voltage
Supply voltage rejection
Dropout voltage
B = 10Hz to 100kHz, TJ = 25°C
ΔVI = 10 V, f = 120Hz
IO = 1 A, TJ = 25°C, ΔVO = 100 mV
54
1.1
1.5
2.5
Isc
Short circuit current
A
Iscp
Short circuit peak current TJ = 25°C
A
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.
8/20
L79xxAC
Table 6.
Electrical characteristics
Electrical characteristics of L7915AC (refer to the test circuits, T = 0 to 125 °C, V = -23
J
I
V, I = 500 mA, C = 2.2 µF, C = 1 µF unless otherwise specified)
O
I
O
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
VO
Output voltage
Output voltage
TJ = 25°C
-14.7
-15
-15.3
V
IO = -5 mA to -1 A, PO ≤15 W
VI = -18.5 to -30 V
VO
-14.4
-15
-15.6
V
VI = -17.5 to -30 V, TJ = 25°C
VI = -20 to -26 V, TJ = 25°C
300
150
300
150
3
(1)
ΔVO
Line regulation
mV
I
O = 5 mA to 1.5 A, TJ = 25°C
(1)
ΔVO
Load regulation
mV
mA
mA
IO = 250 to 750 mA, TJ = 25°C
TJ = 25°C
Id
Quiescent current
I
O = 5 mA to 1 A
0.5
1
ΔId
Quiescent current change
VI = -18.5 to -30 V
ΔVO/ΔT Output voltage drift
IO = 5 mA
-0.9
250
60
mV/°C
µV
dB
V
eN
SVR
Vd
Output noise voltage
Supply voltage rejection
Dropout voltage
B = 10Hz to 100kHz, TJ = 25°C
ΔVI = 10 V, f = 120Hz
IO = 1 A, TJ = 25°C, ΔVO = 100 mV
54
1.1
1.3
2.5
Isc
Short circuit current
A
Iscp
Short circuit peak current TJ = 25°C
A
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.
9/20
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.
10/20
L79xxAC
Figure 6.
Application information
Circuit for increasing output voltage
VO=VXX(R1+R2)/R2
GND
IN
OUT
VXX/R2 > 3Id
C3 Optional for improved transient response and ripple rejection.
Figure 7.
High current negative regulator (-5 V / 4 A with 5 A current limiting)
IN
OUT
GND
11/20
Package mechanical data
L79xxAC
7
Package mechanical data
®
In order to meet environmental requirements, ST offers these devices in ECOPACK
packages. These packages have a lead-free second level interconnect. The category of
second Level Interconnect is marked on the package and on the inner box label, in
compliance with JEDEC Standard JESD97. The maximum ratings related to soldering
conditions are also marked on the inner box label. ECOPACK is an ST trademark.
ECOPACK specifications are available at: www.st.com.
12/20
L79xxAC
Package mechanical data
TO-220 mechanical data
mm.
inch.
Dim.
Min.
4.40
1.23
2.40
Typ.
Max.
4.60
1.32
2.72
Min.
0.173
0.048
0.094
Typ.
Max.
0.181
0.051
0.107
A
C
D
D1
E
1.27
0.050
0.49
0.61
1.14
1.14
4.95
2.4
0.70
0.88
1.70
1.70
5.15
2.7
0.019
0.024
0.044
0.044
0.194
0.094
0.393
0.027
0.034
0.067
0.067
0.203
0.106
0.409
F
F1
F2
G
G1
H2
L2
L4
L5
L6
L7
L9
DIA.
10.0
10.40
16.4
0.645
13.0
2.65
15.25
6.2
14.0
2.95
15.75
6.6
0.511
0.104
0.600
0.244
0.137
0.147
0.551
0.116
0.620
0.260
0.154
0.151
3.5
3.93
3.85
3.75
P011C
13/20
Package mechanical data
L79xxAC
2
Figure 8.
Drawing dimension D PAK (type STD-ST)
0079457/L
14/20
L79xxAC
Figure 9.
Package mechanical data
2
Drawing dimension D PAK (type WOOSEOK-subcon.)
0079457/L
15/20
Package mechanical data
L79xxAC
2
Table 7.
D PAK mechanical data
Type STD-ST
mm.
Type WOOSEOK-subcon.
Dim.
mm.
Typ.
Min.
Typ.
Max.
Min.
Max.
A
A1
b
4.40
0.03
0.70
1.14
0.45
1.23
8.95
7.50
10
4.60
0.23
0.93
1.70
0.60
1.36
9.35
4.30
0
4.70
0.20
0.90
1.37
0.60
1.40
9.40
0.70
1.17
0.45
1.25
9
b2
c
0.50
1.30
9.20
c2
D
D1
E
7.50
9.80
7.50
10.40
10.20
E1
e
8.50
2.54
2.54
5.08
e1
H
4.88
15
5.28
15.85
2.69
2.79
1.40
1.75
15
2.20
1.79
1
15.30
15.60
2.60
2.79
1.40
1.60
J1
L
2.49
2.29
1.27
1.30
L1
L2
R
1.20
0.4
0.30
V2
0°
8°
0°
3°
2
Note:
The D PAK package coming from the subcontractor WOOSEOK is fully compatible with the
ST's package suggested footprint.
16/20
L79xxAC
Package mechanical data
2
Figure 10. D PAK footprint recommended data
Table 8.
Footprint data
Dim.
Values
mm.
inch.
A
B
C
D
E
F
12.20
9.75
16.90
3.50
1.60
2.54
5.08
0.480
0.384
0.665
0.138
0.063
0.100
0.200
G
17/20
Package mechanical data
L79xxAC
Tape & reel D2PAK-P2PAK-D2PAK/A-P2PAK/A mechanical data
mm.
Typ.
inch.
Typ.
Dim.
Min.
Max.
180
Min.
Max.
7.086
0.519
A
C
D
12.8
20.2
60
13.0
13.2
0.504
0.795
2.362
0.512
N
T
14.4
10.70
15.90
5.00
4.1
0.567
0.421
0.626
0.197
0.161
0.476
Ao
Bo
Ko
Po
P
10.50
15.70
4.80
3.9
10.6
15.80
4.90
4.0
0.413
0.618
0.189
0.153
0.468
0.417
0.622
0.193
0.157
0.472
11.9
12.0
12.1
18/20
L79xxAC
8
Revision history
Revision history
Table 9.
Document revision history
Revision
Date
Changes
22-Jun-2004
12-Dec-2007
18-Feb-2008
7
8
9
Order codes updated.
Added: Table 1.
Modified: Table 1 on page 1.
19/20
L79xxAC
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