STMicroelectronics L7905AC 2 % negative voltage regulatorsm Datasheet

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
TO-220
D2PAK
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
Order codes
Part numbers
Output voltages
TO-220
D2PAK
L7905AC
L7905ACV
L7905ACD2T-TR
-5 V
L7912AC
L7912ACV
L7912ACD2T-TR
-12 V
L7915AC
L7915ACV
February 2008
-15 V
Rev 9
1/20
www.st.com
20
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2/20
L79xxAC
Diagram
1
Diagram
Figure 1.
Schematic diagram
3/20
Pin configuration
L79xxAC
2
Pin configuration
Figure 2.
Pin connections (top view)
TO-220
4/20
D2PAK
L79xxAC
Maximum ratings
3
Maximum ratings
Table 2.
Absolute maximum ratings
Symbol
Parameter
Value
for VO= -5 to -18V
-35
for VO= -20, -24V
-40
VI
DC input voltage
IO
Output current
Internally limited
PD
Power dissipation
Internally limited
TSTG
Storage temperature range
TOP
Operating junction temperature range
Unit
V
-65 to 150
°C
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
RthJC
Thermal resistance junction-case
RthJA
Thermal resistance junction-ambient
D2PAK
TO-220
Unit
3
3
°C/W
62.5
50
°C/W
5/20
Application
L79xxAC
4
Application
Figure 3.
Application circuit
6/20
L79xxAC
Electrical characteristics
5
Electrical characteristics
Table 4.
Electrical characteristics of L7905AC (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)
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
VO
Output voltage
TJ = 25°C
-4.9
-5
-5.1
V
VO
Output voltage
IO = -5 mA to -1 A, PO ≤15 W
VI = -8 to -20 V
-4.8
-5
-5.2
V
ΔVO(1)
Line regulation
ΔVO(1)
Load regulation
Id
ΔId
ΔVO/ΔT
Quiescent current
Quiescent current change
VI = -7 to -25 V, TJ = 25°C
100
VI = -8 to -12 V, TJ = 25°C
50
IO = 5 mA to 1.5 A, TJ = 25°C
100
IO = 250 to 750 mA, TJ = 25°C
50
TJ = 25°C
3
mV
mV
IO = 5 mA to 1 A
0.5
VI = -8 to -25 V
1.3
mA
mA
Output voltage drift
IO = 5 mA
-0.4
mV/°C
Output noise voltage
B = 10Hz to 100kHz, TJ = 25°C
100
µV
Supply voltage rejection
ΔVI = 10 V, f = 120Hz
60
dB
Vd
Dropout voltage
IO = 1 A, TJ = 25°C, ΔVO = 100 mV
1.4
V
Isc
Short circuit current
2.1
A
Iscp
Short circuit peak current
2.5
A
eN
SVR
TJ = 25°C
54
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
Table 5.
Symbol
L79xxAC
Electrical characteristics of L7912AC (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)
Parameter
Test conditions
Min.
Typ.
Max.
Unit
VO
Output voltage
TJ = 25°C
-11.75
-12
-12.25
V
VO
Output voltage
IO = -5 mA to -1 A, PO ≤15 W
VI = -15.5 to -27 V
-11.5
-12
-12.5
V
ΔVO(1)
Line regulation
ΔVO(1)
Load regulation
Id
ΔId
ΔVO/ΔT
Quiescent current
Quiescent current change
VI = -14.5 to -30 V, TJ = 25°C
240
VI = -16 to -22 V, TJ = 25°C
120
IO = 5 mA to 1.5 A, TJ = 25°C
240
IO = 250 to 750 mA, TJ = 25°C
120
mV
mV
TJ = 25°C
3
IO = 5 mA to 1 A
0.5
VI = -15 to -30 V
1
mA
mA
Output voltage drift
IO = 5 mA
-0.8
mV/°C
Output noise voltage
B = 10Hz to 100kHz, TJ = 25°C
200
µV
Supply voltage rejection
ΔVI = 10 V, f = 120Hz
60
dB
Vd
Dropout voltage
IO = 1 A, TJ = 25°C, ΔVO = 100 mV
1.1
V
Isc
Short circuit current
1.5
A
Iscp
Short circuit peak current
2.5
A
eN
SVR
TJ = 25°C
54
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.
Symbol
Electrical characteristics
Electrical characteristics of L7915AC (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)
Parameter
Test conditions
Min.
Typ.
Max.
Unit
VO
Output voltage
TJ = 25°C
-14.7
-15
-15.3
V
VO
Output voltage
IO = -5 mA to -1 A, PO ≤15 W
VI = -18.5 to -30 V
-14.4
-15
-15.6
V
ΔVO(1)
Line regulation
ΔVO(1)
Load regulation
Id
ΔId
ΔVO/ΔT
Quiescent current
Quiescent current change
VI = -17.5 to -30 V, TJ = 25°C
300
VI = -20 to -26 V, TJ = 25°C
150
IO = 5 mA to 1.5 A, TJ = 25°C
300
IO = 250 to 750 mA, TJ = 25°C
150
mV
mV
TJ = 25°C
3
IO = 5 mA to 1 A
mA
0.5
mA
VI = -18.5 to -30 V
1
Output voltage drift
IO = 5 mA
-0.9
mV/°C
Output noise voltage
B = 10Hz to 100kHz, TJ = 25°C
250
µV
Supply voltage rejection
ΔVI = 10 V, f = 120Hz
60
dB
Vd
Dropout voltage
IO = 1 A, TJ = 25°C, ΔVO = 100 mV
1.1
V
Isc
Short circuit current
1.3
A
Iscp
Short circuit peak current
2.5
A
eN
SVR
TJ = 25°C
54
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
6
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.
10/20
L79xxAC
Figure 6.
Application information
Circuit for increasing output voltage
VO=VXX(R1+R2)/R2
VXX/R2 > 3Id
GND
IN
OUT
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
7
L79xxAC
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
Dim.
mm.
Min.
Typ.
inch.
Max.
Min.
Typ.
Max.
A
4.40
4.60
0.173
0.181
C
1.23
1.32
0.048
0.051
D
2.40
2.72
0.094
0.107
0.70
0.019
0.027
D1
E
1.27
0.49
0.050
F
0.61
0.88
0.024
0.034
F1
1.14
1.70
0.044
0.067
F2
1.14
1.70
0.044
0.067
G
4.95
5.15
0.194
0.203
G1
2.4
2.7
0.094
0.106
H2
10.0
10.40
0.393
0.409
L2
16.4
0.645
L4
13.0
14.0
0.511
0.551
L5
2.65
2.95
0.104
0.116
L6
15.25
15.75
0.600
0.620
L7
6.2
6.6
0.244
0.260
L9
3.5
3.93
0.137
0.154
DIA.
3.75
3.85
0.147
0.151
P011C
13/20
Package mechanical data
Figure 8.
L79xxAC
Drawing dimension D2PAK (type STD-ST)
0079457/L
14/20
L79xxAC
Figure 9.
Package mechanical data
Drawing dimension D2PAK (type WOOSEOK-subcon.)
0079457/L
15/20
Package mechanical data
Table 7.
D2PAK mechanical data
Dim.
Min.
Type WOOSEOK-subcon.
mm.
mm.
Typ.
Max.
Min.
Typ.
Max.
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
E
10
E1
8.50
7.50
10.40
9.80
10.20
7.50
2.54
2.54
e1
4.88
5.28
H
15
15.85
15
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
V2
16/20
Type STD-ST
A
e
Note:
L79xxAC
5.08
0.4
0°
15.30
15.60
0.30
8°
0°
3°
The D2PAK package coming from the subcontractor WOOSEOK is fully compatible with the
ST's package suggested footprint.
L79xxAC
Package mechanical data
Figure 10. D2PAK footprint recommended data
Table 8.
Footprint data
Values
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
17/20
Package mechanical data
L79xxAC
Tape & reel D2PAK-P2PAK-D2PAK/A-P2PAK/A mechanical data
mm.
inch.
Dim.
Min.
Typ.
A
Min.
Typ.
180
13.0
13.2
Max.
7.086
C
12.8
D
20.2
0.795
N
60
2.362
T
18/20
Max.
0.504
0.512
14.4
0.519
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
4.80
4.90
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
L79xxAC
Revision history
8
Revision history
Table 9.
Document revision history
Date
Revision
Changes
22-Jun-2004
7
Order codes updated.
12-Dec-2007
8
Added: Table 1.
18-Feb-2008
9
Modified: Table 1 on page 1.
19/20
L79xxAC
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