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Features
■ Output current up to 100 mA
■ Output voltages of -5; -6; -8; -9; -12; -15V
■ Thermal overload protection
■ Short circuit protection
■ No external components are required
■ Available in either ±5% (AC) or ±10% (C)
selection
Description
The L79Lxx series of three-terminal negative
regulators employ internal current limiting and
thermal shutdown, making them essentially
indestructible. If adequate heat-sink is provided,
they can deliver up to 100 mA output current.
They are intended as fixed voltage regulators in a
wide range of applications including local or oncard regulation for elimination of noise and
distribution problems associated with single-point
regulation. In addition, they can be used with
L79LxxAB
L79LxxAC - L79LxxC
Negative voltage regulators
TO-92
SO-8
power pass elements to make high-current
voltage regulators.
The L79Lxx series used as Zener diode/resistor
combination replacement, offers an effective
output impedance improvement of typically two
orders of magnitude, along with lower quiescent
current and lower noise.
SOT-89
Table 1. Device summary
Part number
L79L05AC L79L09AC
L79L05AB L79L09AB
L79L06C L79L12C
L79L06AC L79L12AC
L79L06AB L79L12AB
L79L08C L79L15C
L79L08AC L79L15AC
L79L08AB L79L15AB
L79L09C
December 2007 Rev 14 1/22
www.st.com
22
L79LxxAB - L79LxxAC - L79LxxC
Contents
1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2/22
L79LxxAB - L79LxxAC - L79LxxC Diagram
1 Diagram
Figure 1. Schematic diagram
3/22
Pin configuration L79LxxAB - L79LxxAC - L79LxxC
2 Pin configuration
Figure 2. Pin connection (top view, bottom view for TO-92)
PIN 1 = GND
PIN 2 = V
PIN 3 = V
IN
OUT
SO-8
Figure 3. Test circuit
SOT-89
TO-92
4/22
L79LxxAB - L79LxxAC - L79LxxC Maximum ratings
3 Maximum ratings
Table 2. Absolute maximum ratings
Symbol Parameter Value Unit
V
= -5 to -9 V -30
V
I
P
T
STG
T
OP
1. Our SO-8 package used for Voltage Regulators is modified internally to have pins 2, 3, 6 and 7 electrically communed to
the die attach flag. This particular frame decreases the total thermal resistance of the package and increases its ability to
dissipate power when an appropriate area of copper on the printed circuit board is available for heat-sinking. The external
dimensions are the same as for the standard SO-8.
DC input voltage
I
Output current 100 mA
O
Power dissipation Internally Limited
D
Storage temperature range -40 to 150 °C
Operating junction temperature range
Table 3. Thermal data
O
= -12 to -15 V -35
V
O
For L79L00C, L79L00AC 0 to 125
For L79L00AB -40 to 125
(1)
V
mW
°C
Symbol Parameter SO-8 TO-92 SOT-89 Unit
R
thJC
R
thJA
1. Considering 6 cm2 of copper Board heat-sink.
Thermal resistance junction-case. (Max) 20 15 °C/W
Thermal resistance junction-ambient. (Max) 55
(1)
200 °C/W
5/22
Electrical characteristics L79LxxAB - L79LxxAC - L79LxxC
4 Electrical characteristics
Table 4. Electrical characteristics of L79L05 (refer to the test circuits, TJ = 0 to 125 °C, VI = -10 V,
I
= 40 mA, CI = 0.33 µF, CO = 0.1 µF unless otherwise specified)
O
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
V
ΔV
ΔV
ΔI
Output voltage TJ = 25°C -4.6 -5 -5.4 V
O
I
= 1 to 40 mA, VI = -7 to -20 V -4.5 -5.5
Output voltage
O
Line regulation
O
Load regulation
O
I
Quiescent current
d
Quiescent current change
d
O
= 1 to 70 mA, VI = -10 V -4.5 -5.5
I
O
V
= -7 to -20 V, TJ = 25°C 200
I
= -8 to -20 V, TJ = 25°C 150
V
I
I
= 1 to 100 mA, TJ = 25°C 60
O
= 1 to 40 mA, TJ = 25°C 30
I
O
T
= 25°C 6 mA
J
T
= 125°C 5.5 mA
J
I
= 1 to 40 mA 0.2
O
= -8 to -20 V 1.5
V
I
eN Output noise voltage B =10Hz to 100kHz, T
= -8 to -18V, f = 120Hz
V
SVR Supply voltage rejection
V
Dropout voltage 1.7 V
d
I
IO = 40 mA, TJ = 25°C
= 25°C 40 µV
J
40 49 dB
V
mV
mV
mA
6/22
L79LxxAB - L79LxxAC - L79LxxC Electrical characteristics
Table 5. Electrical characteristics of L79L06 (refer to the test circuits, TJ = 0 to 125 °C, VI = -12 V,
I
= 40 mA, CI = 0.33 µF, CO = 0.1 µF unless otherwise specified)
O
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
V
ΔV
ΔV
ΔI
eN Output noise voltage B =10Hz to 100kHz, T
SVR Supply voltage rejection
V
Output voltage TJ = 25°C -5.52-6-6.48 V
O
I
= 1 to 40 mA, VI = -8.5 to -20 V -5.4 -6.6
Output voltage
O
Line regulation
O
Load regulation
O
I
Quiescent current
d
Quiescent current change
d
Dropout voltage 1.7 V
d
O
= 1 to 70 mA, VI = -12 V -5.4 -6.6
I
O
V
= -8.5 to -20 V, TJ = 25°C 200
I
= -9 to -20 V, TJ = 25°C 150
V
I
I
= 1 to 100 mA, TJ = 25°C 60
O
= 1 to 40 mA, TJ = 25°C 30
I
O
T
= 25°C 6 mA
J
T
= 125°C 5.5 mA
J
I
= 1 to 40 mA 0.2
O
= -8 to -20 V 1.5
V
I
= 25°C 50 µV
J
= -9 to -20V, f = 120Hz
V
I
IO = 40 mA, TJ = 25°C
38 46 dB
V
mV
mV
mA
Table 6. Electrical characteristics of L79L08 (refer to the test circuits, TJ = 0 to 125 °C, VI = -14 V,
I
= 40 mA, CI = 0.33 µF, CO = 0.1 µF unless otherwise specified)
O
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
V
ΔV
Output voltage TJ = 25°C -7.36-8-8.64 V
O
I
= 1 to 40 mA, VI = -10.5 to -23 V -7.2 -8.8
Output voltage
O
Line regulation
O
O
= 1 to 70 mA, VI = -14 V -7.2 -8.8
I
O
V
= -10.5 to -23 V, TJ = 25°C 200
I
= -11 to -23 V, TJ = 25°C 150
V
I
IO = 1 to 100 mA, TJ = 25°C 80
ΔV
ΔI
Load regulation
O
I
Quiescent current
d
Quiescent current change
d
= 1 to 40 mA, TJ = 25°C 40
I
O
T
= 25°C 6 mA
J
= 125°C 5.5 mA
T
J
I
= 1 to 40 mA 0.2
O
= -11 to -23 V 1.5
V
I
eN Output noise voltage B =10Hz to 100kHz, T
= -12 to -23V, f = 120Hz
V
SVR Supply voltage rejection
V
Dropout voltage 1.7 V
d
I
= 40 mA, TJ = 25°C
I
O
= 25°C 60 µV
J
36 45 dB
V
mV
mV
mA
7/22
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