L79LxxAB
L79LxxAC - L79LxxC
Negative voltage regulators
Features
■
■
■
■
■
■
Output current up to 100 mA
Output voltages of -5; -6; -8; -9; -12; -15 V
Thermal overload protection
Short circuit protection
No external components are required
Available in either ±5% (AC) or ±10% (C)
selection
TO-92
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 on-
card regulation for elimination of noise and
distribution problems associated with single-point
regulation. In addition, they can be used with
SO-8
SOT-89
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.
Table 1.
Device summary
Part numbers
L79L05AC
L79L05AB
L79L06C
L79L06AC
L79L06AB
L79L08C
L79L08AC
L79L08AB
L79L09C
L79L09AC
L79L09AB
L79L12C
L79L12AC
L79L12AB
L79L15C
L79L15AC
L79L15AB
July 2009
Doc ID 2511 Rev 16
1/27
www.st.com
27
L79LxxAB, L79LxxAC, L79LxxC
Contents
1
2
3
4
5
6
7
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Order codes
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
2/27
Doc ID 2511 Rev 16
L79LxxAB, L79LxxAC, L79LxxC
Diagram
1
Figure 1.
Diagram
Schematic diagram
Doc ID 2511 Rev 16
3/27
Pin configuration
L79LxxAB, L79LxxAC, L79LxxC
2
Figure 2.
Pin configuration
Pin connection
(top view, bottom view for TO-92)
PIN 1 = GND
PIN 2 = V
IN
PIN 3 = V
OUT
SO-8
SOT-89
TO-92
Figure 3.
Test circuit
4/27
Doc ID 2511 Rev 16
L79LxxAB, L79LxxAC, L79LxxC
Maximum ratings
3
Table 2.
Symbol
V
I
I
O
P
D
T
STG
T
OP
Maximum ratings
Absolute maximum ratings
Parameter
DC input voltage
Output current
Power dissipation
Storage temperature range
For L79L00C, L79L00AC
Operating junction temperature range
For L79L00AB
-40 to 125
V
O
= -5 to -9 V
V
O
= -12 to -15 V
Value
-30
V
-35
100
Internally limited
(1)
-40 to 150
0 to 125
°C
mA
mW
°C
Unit
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.
Table 3.
Symbol
R
thJC
R
thJA
1.
Thermal data
Parameter
Thermal resistance junction-case. (Max)
Thermal resistance junction-ambient. (Max)
SO-8
20
55
(1)
200
TO-92
SOT-89
15
Unit
°C/W
°C/W
Considering 6 cm
2
of copper Board heat-sink.
Doc ID 2511 Rev 16
5/27
京公网安备 11010802033920号
EEWORLD
