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©2011 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.3
Features
• Output Current in Excess of 1A
• Output Voltages of -5, -6, -8 , -9, -10, -12, -15, -18 and -
24V
• Internal Thermal Overload Protection
• Short Circuit Protection
• Output Transistor Safe Operating Area Compensation
Description
The LM79XX series of three terminal negative regulators
are available in TO-220 package and with several fixed
output voltages, making them useful in a wide range
of applications. Each type employs internal current limiting,
thermal shut down and safe operating area protection,
making it essentially indestructible.
TO-220 (Single Gauge)
1. GND 2. Input 3. Output
1
Vin
Internal Block Digram
VOLTAGE
REFERENCE
+
-
PROTECTION
CIRCUITRY
R1
R2
Rsc
GND
I1
I2
Out
In
Q1
Q2
Output
Input
LM79XX
3-Terminal 1A Negative Voltage Regulator
LM79XX
2
Absolute Maximum Ratings
Note:
1. Thermal resistance test board
Size: 76.2mm * 114.3mm * 1.6mm(1S0P)
JEDEC standard: JESD51-3, JESD51-7
2. Assume no ambient airflow
Electrical Characteristics (LM7905)
(V
I
= -10V, I
O
= 500mA, 0
°C ≤T
J
≤ +125 °C, C
I
=2.2
μF, C
O
=1
μF, unless otherwise specified.)
Note
3. Load and line regulation are specified at constant junction temperature. Changes in V
O
due to heating effects must be taken
into account separately. Pulse testing with low duty is used.
Parameter
Symbol
Value
Unit
Input Voltage
V
I
-35
V
Thermal Resistance Junction-Case (Note1)
R
ΘJC
5
°C/W
Thermal Resistance Junction-Air (Note1, 2)
R
ΘJA
65
Operating Temperature Range
T
OPR
0 ~ +125
°C
Storage Temperature Range
T
STG
-65 ~ +150
°C
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
Output Voltage
V
O
T
J
= +25
°C
-4.8
-5.0
-5.2
V
I
O
= 5mA to 1A, P
O
≤
15W
V
I
= -7V to -20V
-4.75
-5.0
-5.25
Line Regulation (Note3)
ΔV
O
T
J
= +25
°C
V
I
= -7V to -25V
-
35
100
mV
V
I
= -8V to -12V
-
8
50
Load Regulation (Note3)
ΔV
O
T
J
= +25
°C
I
O
= 5mA to 1.5A
-
10
100
mV
T
J
=+25
°C
I
O
= 250mA to 750mA
-
3
50
Quiescent Current
I
Q
T
J
=+25
°C
-
3
6
mA
Quiescent Current Change
ΔI
Q
I
O
= 5mA to 1A
-
0.05
0.5
mA
V
I
= -8V to -25V
-
0.1
0.8
Temperature Coefficient of V
D
ΔVo/ΔT
I
O
= 5mA
-
- 0.4
-
mV/
°C
Output Noise Voltage
V
N
f = 10Hz to 100kHz
T
A
=+25
°C
-
40
-
μV
Ripple Rejection
RR
f = 120Hz
ΔV
I
= 10V
54
60
-
dB
Dropout Voltage
V
D
T
J
= +25
°C
I
O
= 1A
-
2
-
V
Short Circuit Current
I
SC
T
J
=+25
°C, V
I
= -35V
-
300
-
mA
Peak Current
I
PK
T
J
=+25
°C
-
2.2
-
A
LM79XX
3
Electrical Characteristics (LM7906)
(Continued)
(V
I
= -11V, I
O
= 500mA, 0
°C ≤T
J
≤ +125 °C, C
I
=2.2
μF, C
O
=1
μF, unless otherwise specified.)
Note
1. Load and line regulation are specified at constant junction temperature. Changes in V
O
due to heating effects must be taken
into account separately. Pulse testing with low duty is used.
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
Output Voltage
V
O
T
J
= +25
°C
-5.75
-6
-6.25
V
I
O
= 5mA to 1A, P
O
≤ 15W
V
I
= -9V to -21V
-5.7
-6
-6.3
Line Regulation (Note1)
ΔV
O
T
J
= +25
°C
V
I
= -8V to -25V
-
10
120
mV
V
I
= -9V to -13V
-
5
60
Load Regulation (Note1)
ΔV
O
T
J
= +25
°C
I
O
= 5mA to 1.5A
-
10
120
mV
T
J
=+25
°C
I
O
= 250mA to 750mA
-
3
60
Quiescent Current
I
Q
T
J
=+25
°C
-
3
6
mA
Quiescent Current Change
ΔI
Q
I
O
= 5mA to 1A
-
0.05
0.5
mA
V
I
= -8V to -25V
-
0.1
1.3
Temperature Coefficient of V
D
ΔVo/ΔT
I
O
= 5mA
-
-0.5
-
mV/
°C
Output Noise Voltage
V
N
f = 10Hz to 100kHz
T
A
=+25
°C
-
130
-
μV
Ripple Rejection
RR
f = 120Hz
ΔV
I
= 10V
54
60
-
dB
Dropout Voltage
V
D
T
J
= +25
°C
I
O
= 1A
-
2
-
V
Short Circuit Current
I
SC
T
J
= +25
°C, V
I
= -35V
-
300
-
mA
Peak Current
I
PK
T
J
= +25
°C
-
2.2
-
A
LM79XX
4
Electrical Characteristics (LM7908)
(Continued)
(V
I
= -14V, I
O
= 500mA, 0
°C ≤T
J
≤ +125 °C, C
I
=2.2
μF, C
O
=1
μF, unless otherwise specified.)
Note
1. Load and line regulation are specified at constant junction temperature. Changes in V
O
due to heating effects must be taken
into account separately. Pulse testing with low duty is used.
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
Output Voltage
V
O
T
J
= +25
°C
-7.7
-8
-8.3
V
I
O
= 5mA to 1A, P
O
≤ 15W
V
I
= -10V to -23V
-7.6
-8
-8.4
Line Regulation (Note1)
ΔV
O
T
J
= +25
°C
V
I
= -10.5V to -25V
-
10
160
mV
V
I
= -11V to -17V
-
5
80
Load Regulation (Note1)
ΔV
O
T
J
= +25
°C
I
O
= 5mA to 1.5A
-
12
160
mV
T
J
=+25
°C
I
O
= 250mA to 750mA
-
4
80
Quiescent Current
I
Q
T
J
=+25
°C
-
3
6
mA
Quiescent Current Change
ΔI
Q
I
O
= 5mA to 1A
-
0.05
0.5
mA
V
I
= -10.5V to -25V
-
0.1
1
Temperature Coefficient of V
D
ΔVo/ΔT
I
O
= 5mA
-
-0.6
-
mV/
°C
Output Noise Voltage
V
N
f = 10Hz to 100kHz
T
A
=+25
°C
-
175
-
μV
Ripple Rejection
RR
f = 120Hz
ΔV
I
= 10V
54
60
-
dB
Dropout Voltage
V
D
T
J
= +25
°C
I
O
= 1A
-
2
-
V
Short Circuit Current
I
SC
T
J
= +25
°C, V
I
= -35V
-
300
-
mA
Peak Current
I
PK
T
J
= +25
°C
-
2.2
-
A
LM79XX
5
Electrical Characteristics (LM7909)
(Continued)
(V
I
= -15V, I
O
= 500mA, 0
°C ≤T
J
≤ +125 °C, C
I
=2.2
μF, C
O
=1
μF, unless otherwise specified.)
Note:
1. Load and line regulation are specified at constant junction temperature. Changes in V
O
due to heating effects must be taken
into account separately. Pulse testing with low duty is used.
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
Output Voltage
V
O
T
J
= +25
°C
-8.7
-9.0
-9.3
V
I
O
= 5mA to 1A, P
O
≤ 15W
V
I
= -1.5V to -23V
-8.6
-9.0
-9.4
Line Regulation (Note1)
ΔV
O
T
J
= +25
°C
V
I
= -11.5V to -26V
-
10
180
mV
V
I
= -12V to -18V
-
5
90
Load Regulation (Note1)
ΔV
O
T
J
= +25
°C
I
O
= 5mA to 1.5A
-
12
180
mV
T
J
= +25
°C
I
O
= 250mA to 750mA
-
4
90
Quiescent Current
I
Q
T
J
= +25
°C
-
3
6
mA
Quiescent Current Change
ΔI
Q
I
O
= 5mA to 1A
-
0.05
0.5
mA
V
I
= -11.5V to -26V
-
0.1
1
Temperature Coefficient of V
D
ΔVo/ΔT
I
O
= 5mA
-
-0.6
-
mV/
°C
Output Noise Voltage
V
N
f = 10Hz to 100kHz
T
A
= +25
°C
-
175
-
μV
Ripple Rejection
RR
f = 120Hz
ΔV
I
= 10V
54
60
-
dB
Dropout Voltage
V
D
T
J
= +25
°C
I
O
= 1A
-
2
-
V
Short Circuit Current
I
SC
T
J
= +25
°C, V
I
= -35V
-
300
-
mA
Peak Current
I
PK
T
J
= +25
°C
-
2.2
-
A
LM79XX
6
Electrical Characteristics (LM7910)
(Continued)
(V
I
= -17V, I
O
= 500mA, 0
°C ≤T
J
≤ +125 °C, C
I
=2.2
μF, C
O
=1
μF, unless otherwise specified.)
Note:
1. Load and line regulation are specified at constant junction temperature. Changes in V
O
due to heating effects must be taken
into account separately. Pulse testing with low duty is used.
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
Output Voltage
V
O
T
J
= +25
°C
-9.6
-10
-10.4
V
I
O
= 5mA to 1A, P
d
≤ 15W
V
I
= -12V to -28
-9.5
-10
-10.5
Line Regulation (Note1)
ΔV
O
T
J
= +25
°C
V
I
= -12.5V to -28V
-
12
200
mV
V
I
= -14V to -20V
-
6
100
Load Regulation (Note1)
ΔV
O
T
J
= +25
°C
I
O
= 5mA to 1.5A
-
12
200
mV
T
J
= +25
°C
I
O
= 250mA to 750mA
-
4
100
Quiescent Current
I
Q
T
J
= +25
°C
-
3
6
mA
Quiescent Current Change
ΔI
Q
I
O
= 5mA to 1A
-
0.05
0.5
mA
V
I
= -12.5V to -28V
-
0.1
1
Temperature Coefficient of V
O
ΔVo/ΔT
I
O
= 5mA
-
-1
-
mV/
°C
Output Noise Voltage
V
N
10Hz
≤ f ≤ 100kHz
T
A
=+25
°C
-
280
-
μV
Ripple Rejection
RR
f = 120Hz
ΔV
I
= 10V
54
60
-
dB
Dropout Voltage
V
D
T
J
= +25
°C
I
O
= 1A
-
2
-
V
Short Circuit Current
I
SC
T
J
= +25
°C, V
I
= -35V
-
300
-
mA
Peak Current
I
PK
T
J
= +25
°C
-
2.2
-
A
LM79XX
7
Electrical Characteristics (LM7912)
(Continued)
(V
I
= -19V, I
O
= 500mA, 0
°C ≤T
J
≤ +125 °C, C
I
=2.2
μF, C
O
=1
μF, unless otherwise specified.)
Note:
1. Load and line regulation are specified at constant junction temperature. Changes in V
O
due to heating effects must be taken
into account separately. Pulse testing with low duty is used.
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
Output Voltage
V
O
T
J
= +25
°C
-11.5
-12
-12.5
V
I
O
= 5mA to 1A, P
O
≤ 15W
V
I
= -15.5V to -27V
-11.4
-12
-12.6
Line Regulation (Note1)
ΔV
O
T
J
= +25
°C
V
I
= -14.5V to -30V
-
12
240
mV
V
I
= -16V to -22V
-
6
120
Load Regulation (Note1)
ΔV
O
T
J
= +25
°C
I
O
= 5mA to 1.5A
-
12
240
mV
T
J
= +25
°C
I
O
= 250mA to 750mA
-
4
120
Quiescent Current
I
Q
T
J
= +25
°C
-
3
6
mA
Quiescent Current Change
ΔI
Q
I
O
= 5mA to 1A
-
0.05
0.5
mA
V
I
= -14.5V to -30V
-
0.1
1
Temperature Coefficient of V
D
ΔVo/ΔT
I
O
= 5mA
-
-0.8
-
mV/
°C
Output Noise Voltage
V
N
f = 10Hz to 100kHz
T
A
= +25
°C
-
200
-
μV
Ripple Rejection
RR
f = 120Hz
ΔV
I
= 10V
54
60
-
dB
Dropout Voltage
V
D
T
J
= +25
°C
I
O
= 1A
-
2
-
V
Short Circuit Current
I
SC
T
J
= +25
°C, V
I
= -35V
-
300
-
mA
Peak Current
I
PK
T
J
= +25
°C
-
2.2
-
A
LM79XX
8
Electrical Characteristics (LM7915)
(Continued)
(V
I
= -23V, I
O
= 500mA, 0
°C ≤T
J
≤ +125 °C, C
I
=2.2
μF, C
O
=1
μF, unless otherwise specified.)
Note:
1. Load and line regulation are specified at constant junction temperature. Changes in V
O
due to heating effects must be taken
into account separately. Pulse testing with low duty is used.
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
Output Voltage
V
O
T
J
= +25
°C
-14.4
-15
-15.6
V
I
O
= 5mA to 1A, P
O
≤ 15W
V
I
= -18V to -30V
-14.25
-15
-15.75
Line Regulation (Note1)
ΔV
O
T
J
= +25
°C
V
I
= -17.5V to -30V
-
12
300
mV
V
I
= -20V to -26V
-
6
150
Load Regulation (Note1)
ΔV
O
T
J
= +25
°C
I
O
= 5mA to 1.5A
-
12
300
mV
T
J
= +25
°C
I
O
= 250mA to 750mA
-
4
150
Quiescent Current
I
Q
T
J
= +25
°C
-
3
6
mA
Quiescent Current Change
ΔI
Q
I
O
= 5mA to 1A
-
0.05
0.5
mA
V
I
= -17.5V to -30V
-
0.1
1
Temperature Coefficient of V
D
ΔVo/ΔT
I
O
= 5mA
-
-0.9
-
mV/
°C
Output Noise Voltage
V
N
f = 10Hz to 100kHz
T
A
=+25
°C
-
250
-
μV
Ripple Rejection
RR
f = 120Hz
ΔV
I
= 10V
54
60
-
dB
Dropout Voltage
V
D
T
J
= +25
°C
I
O
= 1A
-
2
-
V
Short Circuit Current
I
SC
T
J
= +25
°C, V
I
= -35V
-
300
-
mA
Peak Current
I
PK
T
J
= +25
°C
-
2.2
-
A
LM79XX
9
Electrical Characteristics (LM7918)
(Continued)
(V
I
= -27V, I
O
= 500mA, 0
°C ≤T
J
≤ +125 °C, C
I
=2.2
μF, C
O
=1
μF, unless otherwise specified.)
Note:
1. Load and line regulation are specified at constant junction temperature. Changes in V
O
due to heating effects must be taken
into account separately. Pulse testing with low duty is used.
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
Output Voltage
V
O
T
J
= +25
°C
-17.3
-18
-18.7
V
I
O
= 5mA to 1A, P
O
≤ 15W
V
I
= -22.5V to -33V
-17.1
-18
-18.9
Line Regulation (Note1)
ΔV
O
T
J
= +25
°C
V
I
= -21V to -33V
-
15
360
mV
V
I
= -24V to -30V
-
8
180
Load Regulation (Note1)
ΔV
O
T
J
= +25
°C
I
O
= 5mA to 1.5A
-
15
360
mV
T
J
= +25
°C
I
O
= 250mA to 750mA
-
5
180
Quiescent Current
I
Q
T
J
= +25
°C
-
3
6
mA
Quiescent Current Change
ΔI
Q
I
O
= 5mA to 1A
-
0.05
0.5
mA
V
I
= -21V to -33V
-
0.1
1
Temperature Coefficient of V
D
ΔVo/ΔT
I
O
= 5mA
-
-1
-
mV/
°C
Output Noise Voltage
V
N
f = 10Hz to 100kHz
T
A
= +25
°C
-
300
-
μV
Ripple Rejection
RR
f = 120Hz
ΔV
I
= 10V
54
60
-
dB
Dropout Voltage
V
D
T
J
= +25
°C
I
O
= 1A
-
2
-
V
Short Circuit Current
I
SC
T
J
= +25
°C, V
I
= -35V
-
300
-
mA
Peak Current
I
PK
T
J
= +25
°C
-
2.2
-
A
LM79XX
10
Electrical Characteristics (LM7924)
(Continued)
(V
I
= -33V, I
O
= 500mA, 0
°C ≤T
J
≤ +125 °C, C
I
=2.2
μF, C
O
=1
μF, unless otherwise specified.)
Note:
1. Load and line regulation are specified at constant junction temperature. Changes in V
O
due to heating effects must be taken
into account separately. Pulse testing with low duty is used.
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
Output Voltage
V
O
T
J
= +25
°C
-23
-24
-25
V
I
O
= 5mA to 1A, P
O
≤ 15W
V
I
= -27V to -38V
-22.8
-24
-25.2
Line Regulation (Note1)
ΔV
O
T
J
= +25
°C
V
I
= -27V to -38V
-
15
480
mV
V
I
= -30V to -36V
-
8
180
Load Regulation (Note1)
ΔV
O
T
J
= +25
°C
I
O
= 5mA to 1.5A
-
15
480
mV
T
J
= +25
°C
I
O
= 250mA to 750mA
-
5
240
Quiescent Current
I
Q
T
J
= +25
°C
-
3
6
mA
Quiescent Current Change
ΔI
Q
I
O
= 5mA to 1A
-
0.05
0.5
mA
V
I
= -27V to -38V
-
0.1
1
Temperature Coefficient of V
D
ΔVo/ΔT
I
O
= 5mA
-
-1
-
mV/
°C
Output Noise Voltage
V
N
f = 10Hz to 100kHz
T
A
= +25
°C
-
400
-
μV
Ripple Rejection
RR
f = 120Hz
ΔV
I
= 10V
54
60
-
dB
Dropout Voltage
V
D
T
J
= +25
°C
I
O
= 1A
-
2
-
V
Short Circuit Current
I
SC
T
J
= +25
°C, V
I
= -35V
-
300
-
mA
Peak Current
I
PK
T
J
= +25
°C
-
2.2
-
A
LM79XX
11
Typical Performance Characteristics
Figure 1. Output Voltage
Figure 3. Quiescent Current
Figure 5. Short Circuit Current
Figure 2. Load Regulation
Figure 4. Dropout Voltage
4.8
4.85
4.9
4.95
5
5.05
5.1
-40
-25
0
25
50
75
100
125
Vin=10V
Io=40mA
Vin=25V
Io=100mA
Ou
tp
ut
Vo
lta
ge
[-
V]
T
A
, Ambient Temperature [
o
C]
Outp
ut Volta
ge[-
V
]
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
-40
-25
0
25
50
75
100
125
Q
u
ie
s
c
ent Cur
rent [m
A
]
DV
l
[V
]
T
A
, Ambient Temperature [
o
C]
-0.1
-0.05
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
0.5
0.55
0.6
-40
-25
0
25
50
75
100
125
Sh
ort
Cir
cui
t
Cu
rre
nt
[A]
T
A
, Ambient Temperature [
o
C]
Sho
rt Circui
t
Curre
nt[A]
-5
-3
-1
1
3
5
7
9
11
13
15
-40
-25
0
25
50
75
100
125
Io=0.75A
Io=1.5A
Lo
ad
Re
gul
ati
on
[m
V]
T
A
, Ambient Temperature [
o
C]
Load
Regu
la
tion[
mV]
0
0.5
1
1.5
2
2.5
3
3.5
4
-40
-25
0
25
50
75
100
125
Io=1A
Dr
op
out V
o
lt
age
[V
]
T
A
, Ambient Temperature [
o
C]
LM79XX
12
Typical Applications
Figure 6. Negative Fixed output regulator
Figure 7. Split power supply ( ± 12V/1A)
Notes:
(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 electronics are used, at least ten times
value shown should be selected. C
I
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 (1N400l or similar)
should be introduced to protect the device from momentary input short circuit.
2.2
μF
2
- V
I
- V
O
KA79XX
1
3
+
+ 1μF
C
I
C
O
Input
Output
LM79XX
1N4001
2.2
μF
2
- 15V
-12V
KA7912
1
3
+
+
1
μF
0.33
μF
+
KA7812
+ 15V
+12V
+
1
μF
1
2
3
1N4001
GND
*
*
MC7812
LM7912
Co
Co
C1
C1
LM79XX
13
Mechanical Dimensions
Package
Dimensions in millimeters
TO-220 [ SINGLE GAUGE ]
LM79XX
14
Ordering Information
Product Number
Output Voltage Tolerance
Package
Operating Temperature
LM7905CT
±4%
TO-220
(Single Gauge)
0 ~ +125
°C
LM7906CT
LM7908CT
LM7909CT
LM7910CT
LM7912CT
LM7915CT
LM7918CT
LM7924CT
LM79XX
9/7/11 0.0m 001
Stock#DS400021
© 2011 Fairchild Semiconductor Corporation
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