Bay Linear
Linear Excellence
100mA Negative Voltage Regulator
LM79LXX
Description
The Bay Linear LM79LXX is integrated linear negative
regulator with three terminals. The LM79LXX offer several
fixed output voltages making them useful in wide range of
applications. These applications include on-card regulation for
elimination of noise and distribution problems associated with
single-point regulation. In addition they can be used with
power pass elements to make high-current voltage regulators.
Each of these regulators can deliver up to 100mA of output
current.
When used in replacement for a Zener diode-resistor
combination, an effective improvement in output impedance
can be obtained together with lower-bias current.
The LM79LXX is available in the plastic TO-92 (Z) package.
Features
•
•
•
•
•
•
•
•
Output Current of 100mA
Output Voltage Tolerance of 5%
Internal thermal overload protection
Internal Short-Circuit Limited
No External Component
Output Voltage- 5.0V, -12V, -15V, -18V, -
24V
Offer in plastic TO-92
Direct Replacement for MC79L00
Applications
•
•
Post regulator for switching DC/DC
converter
Bias supply for analog circuits
Packaging Information
Ordering Information
Device
LM79l05
LM79L12
LM79L15
LM79L18
LM79L24
Operating
Voltage
7 to 20
14.5 to 27
17.5 to 30
20.5 to 33
27 to 38
Temp.
0 to 125
°C
0 to 125
°C
0 to 125
°C
0 to 125
°C
0 to 125
°C
Package
TO-92
TO-92
TO-92
TO-92
TO-92
TO-92 (N)
1
2
3
1.
2.
3.
Common
Input
Output
Bottom View
Bay Linear, Inc
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556
www.baylinear.com
LM79LXX
Absolute Maximum Rating
Parameter
Input Voltage
Operating Free-Air, Case, Virtual
Junction Temp.
Storage Temperature Range
Lead temperature 1.6 mm from case
for sec.
LM79L05
-30
0 to 150
-65 to 150
260
LM78L12…LM78L18
-35
0 to 150
-65 to 150
260
LM78L24
-40
0 to 150
-65 to 150
260
Unit
V
°C
Electrical Characteristics (LM79L05)
(V
I
=10V, I
O
=40mA, 0°C
≤T
J
≤125 °C,
C
I
= 0.33µF, C
O
= 0.1µF, unless otherwise specified. (Note 1)
Parameter
Output Voltage
Line Regulation
Load Regulation
Ripple Rejection
Output Noise Voltage
Dropout Voltage
Quiescent Current
Quiescent Current
Change
Symbol
V
O
∆V
O
∆V
O
RR
V
N
V
D
∆I
Q
Conditions
T
J
= 25
°C
V
I
= -7V to -20V T
J
= 25
°C
V
I
= -7V to -20V T
J
= 25
°C
I
O
= 1mA to 100mA, 25
°C
I
O
= 1mA to 40mA, 25
°C
V
I
= -8V to -18V, f=120Hz
F= 10Hz to 100Hz T
J
= 25
°C
T
J
= 25
°C
T
J
= 25
°C
V
I
= -8V to -20V, T
J
= 25
°C
I
O
= 1mA to 40mA, T
J
= 25
°C
MIN
-4.8
TYP
-5.0
15
20
10
49
46
1.7
MAX
-5.2
150
100
60
30
UNIT
V
mV
mV
dB
µV
V
mA
mA
41
6mA
1.5
0.1
Electrical Characteristics (LM79L12)
(V
I
=10V, I
O
=40mA, 0°C
≤T
J
≤125 °C,
C
I
= 0.33µF, C
O
= 0.1µF, unless otherwise specified. (Note 1)
Parameter
Output Voltage
Line Regulation
Load Regulation
Ripple Rejection
Output Noise Voltage
Dropout Voltage
Quiescent Current
Quiescent Current
Change
Symbol
V
O
∆V
O
∆V
O
RR
V
N
V
D
∆I
Q
Conditions
T
J
= 25
°C
V
I
=-14.5V to -27V T
J
= 25
°C
V
I
=- 14.5V to -27V T
J
= 25
°C
I
O
= 1mA to 100mA, 25
°C
I
O
= 1mA to 40mA, 25
°C
V
I
= -16V to -27V, f=120Hz
F= 10Hz to 100Hz TJ = 25
°C
T
J
= 25
°C
T
J
= 25
°C
V
I
= -16V to -27V, T
J
= 25
°C
I
O
= 1mA to 40mA, T
J
= 25
°C
MIN
-11.50
TYP
-12
50
40
24
15
42
80
1.7
MAX
-12.5
250
200
100
50
UNIT
V
mV
mV
dB
µV
V
mA
mA
37
6.5mA
1.5
0.1
Bay Linear, Inc
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556
www.baylinear.com
LM79LXX
Electrical Characteristics (LM79L15)
(V
I
=10V, I
O
=40mA, 0°C
≤T
J
≤125 °C,
C
I
= 0.33µF, C
O
= 0.1µF, unless otherwise specified. (Note 1)
Parameter
Output Voltage
Line Regulation
Load Regulation
Ripple Rejection
Output Noise Voltage
Dropout Voltage
Quiescent Current
Quiescent Current
Change
Symbol
V
O
∆V
O
∆V
O
RR
V
N
V
D
∆I
Q
Conditions
T
J
= 25
°C
V
I
= -17.5V to -30V T
J
= 25
°C
V
I
= -17.5V to -30V T
J
= 25
°C
I
O
= 1mA to 100mA, 25
°C
I
O
= 1mA to 40mA, 25
°C
V
I
= -18.5V to -28.5V, f=120Hz
F= 10Hz to 100Hz TJ = 25
°C
T
J
= 25
°C
T
J
= 25
°C
V
I
= -20V to -30V, T
J
= 25
°C
I
O
= 1mA to 40mA, T
J
= 25
°C
MIN
-14.40
TYP
-15
65
50
25
15
39
90
1.7
MAX
-15.60
250
300
150
75
UNIT
V
mV
mV
dB
µV
V
mA
mA
34
6.5
1.5
0.1
Electrical Characteristics (LM79L18)
(V
I
=10V, I
O
=40mA, 0°C
≤T
J
≤125 °C,
C
I
= 0.33µF, C
O
= 0.1µF, unless otherwise specified. (Note 1)
Parameter
Output Voltage
Line Regulation
Load Regulation
Ripple Rejection
Output Noise Voltage
Dropout Voltage
Quiescent Current
Quiescent Current
Change
Symbol
V
O
∆V
O
∆V
O
RR
V
N
V
D
∆I
Q
Conditions
T
J
= 25
°C
V
I
= -20.5V to -33V T
J
= 25
°C
V
I
= -20.5V to -33V T
J
= 25
°C
I
O
= 1mA to 100mA, 25
°C
I
O
= 1mA to 40mA, 25
°C
V
I
= -23V to -33V, f=120Hz
F= 10Hz to 100Hz TJ = 25
°C
T
J
= 25
°C
T
J
= 25
°C
V
I
= -21V to -33V, T
J
= 25
°C
I
O
= 1mA to 40mA, T
J
= 25
°C
MIN
-17.30
TYP
-18
70
60
27
19
48
150
1.7
4.7
MAX
-18.7
325
375
170
85
UNIT
V
mV
mV
dB
µV
V
mA
mA
33
6.5mA
1.5
0.1
Bay Linear, Inc
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556
www.baylinear.com
LM79LXX
Electrical Characteristics (LM79L24)
(V
I
=10V, I
O
=40mA, 0°C
≤T
J
≤125 °C,
C
I
= 0.33µF, C
O
= 0.1µF, unless otherwise specified. (Note 1)
Parameter
Output Voltage
Line Regulation
Load Regulation
Ripple Rejection
Output Noise Voltage
Dropout Voltage
Quiescent Current
Quiescent Current
Change
Symbol
V
O
∆V
O
∆V
O
RR
V
N
V
D
∆I
Q
Conditions
T
J
= 25
°C
V
I
= -27V to -38V T
J
= 25
°C
V
I
= -27V to -38V T
J
= 25
°C
I
O
= 1mA to 100mA, 25
°C
I
O
= 1mA to 40mA, 25
°C
V
I
=- 29V to -35V, f=120Hz
F= 10Hz to 100Hz TJ = 25
°C
T
J
= 25
°C
T
J
= 25
°C
V
I
= -28V to -38V, T
J
= 25
°C
I
O
= 1mA to 40mA, T
J
= 25
°C
MIN
-23
TYP
-24
90
75
40
25
33
200
1.7
4
MAX
-25
350
300
200
100
UNIT
V
mV
mV
dB
µV
V
mA
mA
30
6.5
1.5
0.1
Advance Information-
These data sheets contain descriptions of products that are in development. The specifications are based on the engineering calculations,
computer simulations and/ or initial prototype evaluation.
Preliminary Information-
These data sheets contain minimum and maximum specifications that are based on the initial device characterizations. These limits are
subject to change upon the completion of the full characterization over the specified temperature and supply voltage ranges.
The application circuit examples are only to explain the representative applications of the devices and are not intended to guarantee any circuit
design or permit any industrial property right to other rights to execute. Bay Linear takes no responsibility for any problems related to any
industrial property right resulting from the use of the contents shown in the data book. Typical parameters can and do vary in different
applications. Customer’s technical experts must validate all operating parameters including “ Typical” for each customer application.
LIFE SUPPORT AND NUCLEAR POLICY
Bay Linear products are not authorized for and should not be used within life support systems which are intended for surgical
implants into the body to support or sustain life, in aircraft, space equipment, submarine, or nuclear facility applications without
the specific written consent of Bay Linear President.
Bay Linear, Inc
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556
www.baylinear.com
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