www.fairchildsemi.com
MC79XX/MC79XXA/LM79XX
3-Terminal 1A Negative Voltage Regulator
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 MC79XX / MC79XXA/ 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
Vin
1
1. GND 2. Input 3. Output
Internal Block Digram
GND
R1
VOLTAGE
REFERENCE
R2
Output
Out
+
Q1
-
Q2
PROTECTION
CIRCUITRY
Rsc
I1
I2
Input
In
Rev. 1.0.1
©2002 Fairchild Semiconductor Corporation
MC79XX/MC79XXA/LM79XX
Absolute Maximum Ratings
Parameter
Input Voltage
Thermal Resistance Junction-Case (Note1)
Thermal Resistance Junction-Air (Note1, 2)
Operating Temperature Range
Storage Temperature Range
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
Symbol
V
I
R
θJC
R
θJA
T
OPR
T
STG
Value
-35
5
65
0 ~ +125
-65 ~ +150
Unit
V
°C/W
°C
°C
Electrical Characteristics (MC7905/LM7905)
(V
I
= -10V, I
O
= 500mA, 0°C
≤T
J
≤
+125°C, C
I
=2.2µF, C
O
=1µF, unless otherwise specified.)
Parameter
Output Voltage
Symbol
T
J
= +25°C
V
O
I
O
= 5mA to 1A, P
O
≤
15W
V
I
= -7V to -20V
T
J
= +25°C
T
J
= +25°C
I
O
= 5mA to 1.5A
T
J
=+25°C
I
O
= 250mA to 750mA
T
J
=+25°C
I
O
= 5mA to 1A
V
I
= -8V to -25V
I
O
= 5mA
f = 10Hz to 100kHz
T
A
=+25°C
f = 120Hz
∆V
I
= 10V
T
J
= +25°C
I
O
= 1A
T
J
=+25°C, V
I
= -35V
T
J
=+25°C
V
I
= -7V to -25V
V
I
= -8V to -12V
Conditions
Min.
-4.8
-4.75
-
-
-
-
-
-
-
-
-
54
-
-
-
Typ.
-5.0
-5.0
35
8
10
3
3
0.05
0.1
- 0.4
40
60
2
300
2.2
Max.
-5.2
-5.25
100
50
100
mV
50
6
0.5
0.8
-
-
-
-
-
-
mA
mA
mV/°C
µV
dB
V
mA
A
V
Unit
Line Regulation (Note3)
∆V
O
mV
Load Regulation (Note3)
∆V
O
Quiescent Current
Quiescent Current Change
Temperature Coefficient of V
D
Output Noise Voltage
Ripple Rejection
Dropout Voltage
Short Circuit Current
Peak Current
I
Q
∆I
Q
∆Vo/∆T
V
N
RR
V
D
I
SC
I
PK
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.
2
MC79XX/MC79XXA/LM79XX
Electrical Characteristics (MC7906)
(Continued)
(V
I
= -11V, I
O
= 500mA, 0°C
≤T
J
≤
+125°C, C
I
=2.2µF, C
O
=1µF, unless otherwise specified.)
Parameter
Output Voltage
Symbol
T
J
= +25°C
V
O
I
O
= 5mA to 1A, P
O
≤
15W
V
I
= -9V to -21V
T
J
= +25°C
T
J
= +25°C
I
O
= 5mA to 1.5A
T
J
=+25°C
I
O
= 250mA to 750mA
T
J
=+25°C
I
O
= 5mA to 1A
V
I
= -8V to -25V
I
O
= 5mA
f = 10Hz to 100kHz
T
A
=+25°C
f = 120Hz
∆V
I
= 10V
T
J
= +25°C
I
O
= 1A
T
J
= +25°C, V
I
= -35V
T
J
= +25°C
V
I
= -8V to -25V
V
I
= -9V to -13V
Conditions
Min.
-5.75
-5.7
-
-
-
-
-
-
-
-
-
54
-
-
-
Typ.
-6
-6
10
5
10
3
3
0.05
0.1
-0.5
130
60
2
300
2.2
Max.
-6.25
-6.3
120
60
120
mV
60
6
0.5
1.3
-
-
-
-
-
-
mA
mA
mV/°C
µV
dB
V
mA
A
V
Unit
Line Regulation (Note1)
∆V
O
mV
Load Regulation (Note1)
∆V
O
Quiescent Current
Quiescent Current Change
Temperature Coefficient of V
D
Output Noise Voltage
Ripple Rejection
Dropout Voltage
Short Circuit Current
Peak Current
I
Q
∆I
Q
∆Vo/∆T
V
N
RR
V
D
I
SC
I
PK
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.
3
MC79XX/MC79XXA/LM79XX
Electrical Characteristics (MC7908)
(Continued)
(V
I
= -14V, I
O
= 500mA, 0°C
≤T
J
≤
+125°C, C
I
=2.2µF, C
O
=1µF, unless otherwise specified.)
Parameter
Output Voltage
Symbol
V
O
Conditions
T
J
= +25°C
I
O
= 5mA to 1A, P
O
≤
15W
V
I
= -10V to -23V
T
J
= +25°C
V
I
= -10.5V to -25V
V
I
= -11V to -17V
Min.
-7.7
-7.6
-
-
-
-
-
-
-
-
-
54
-
-
-
Typ.
-8
-8
10
5
12
4
3
0.05
0.1
-0.6
175
60
2
300
2.2
Max.
-8.3
-8.4
160
80
160
mV
80
6
0.5
1
-
-
-
-
-
-
mA
mA
mV/°C
µV
dB
V
mA
A
V
Unit
Line Regulation (Note1)
∆V
O
mV
Load Regulation (Note1)
∆V
O
T
J
= +25°C
I
O
= 5mA to 1.5A
T
J
=+25°C
I
O
= 250mA to 750mA
T
J
=+25°C
I
O
= 5mA to 1A
V
I
= -10.5V to -25V
I
O
= 5mA
f = 10Hz to 100kHz
T
A
=+25°C
f = 120Hz
∆V
I
= 10V
T
J
= +25°C
I
O
= 1A
T
J
= +25°C, V
I
= -35V
T
J
= +25°C
Quiescent Current
Quiescent Current Change
Temperature Coefficient of V
D
Output Noise Voltage
Ripple Rejection
Dropout Voltage
Short Circuit Current
Peak Current
I
Q
∆I
Q
∆Vo/∆T
V
N
RR
V
D
I
SC
I
PK
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.
4
MC79XX/MC79XXA/LM79XX
Electrical Characteristics (MC7909)
(Continued)
(V
I
= -15V, I
O
= 500mA, 0°C
≤T
J
≤
+125°C, C
I
=2.2µF, C
O
=1µF, unless otherwise specified.)
Parameter
Output Voltage
Symbol
T
J
= +25°C
V
O
I
O
= 5mA to 1A, P
O
≤
15W
V
I
= -1.5V to -23V
T
J
= +25°C
T
J
= +25°C
I
O
= 5mA to 1.5A
T
J
= +25°C
I
O
= 250mA to 750mA
T
J
= +25°C
I
O
= 5mA to 1A
V
I
= -11.5V to -26V
I
O
= 5mA
f = 10Hz to 100kHz
T
A
= +25°C
f = 120Hz
∆V
I
= 10V
T
J
= +25°C
I
O
= 1A
T
J
= +25°C, V
I
= -35V
T
J
= +25°C
V
I
= -11.5V to -26V
V
I
= -12V to -18V
Conditions
Min.
-8.7
-8.6
-
-
-
-
-
-
-
-
-
54
-
-
-
Typ.
-9.0
-9.0
10
5
12
4
3
0.05
0.1
-0.6
175
60
2
300
2.2
Max.
-9.3
-9.4
180
90
180
mV
90
6
0.5
1
-
-
-
-
-
-
mA
mA
mV/°C
µV
dB
V
mA
A
V
Unit
Line Regulation (Note1)
∆V
O
mV
Load Regulation (Note1)
∆V
O
Quiescent Current
Quiescent Current Change
Temperature Coefficient of V
D
Output Noise Voltage
Ripple Rejection
Dropout Voltage
Short Circuit Current
Peak Current
I
Q
∆I
Q
∆Vo/∆T
V
N
RR
V
D
I
SC
I
PK
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.
5
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