Fairchild Semiconductor LM7918AT, LM7915CT, LM7915AT, LM7905CT, LM7905AT Datasheet
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LM79XX/A (KA79XX, MC79XX) FIXED VOLTAGE REGULATOR (NEGATIVE)
3-TERMINAL 1A NEGATIVE VOLTAGE REGULATORS
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 area protection, making it essentially indestructible.
FEATURES
• Output Current in Excess of 1A
• Output Voltages of -5, -6, -8, -12, -15, -18, -24V
• Internal Thermal Overload Protection
• Short Circuit Protection
• Output Transistor Safe-Area Compensation
LM79XXCT
± 4%
LM79XXAT
± 2%
VOLTAGE
REFERENCE
+
-
PROTECTION
CIRCUITRY
R1
R2
Rsc
GND
I1
I2
Out
In
Q1
Q2
TO-220
1: GND 2: Input 3: Output
Device
Operating Temperature
Package
0 ~ +125
°
C
Output Voltage
Tolerance
TO-220
ORDERING INFORMATION
BLOCK DIAGRAM
1999 Fairchild Semiconductor Corporation
Rev. B
LM79XX/A (KA79XX, MC79XX) FIXED VOLTAGE REGULATOR (NEGATIVE)
ABSOLUTE MAXIMUM RATINGS (T
A
=+25°C, unless otherwise specified)
LM7905 ELECTRICAL CHARACTERISTICS
(V
I
= 10V, lO = 500mA, 0°C ≤TJ ≤ +125°C, CI =2.2µF, CO =1µF, unless otherwise specified.)
* 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.
Characteristic Symbol Value Unit
Input Voltage V
I
-35 V
Thermal Resistance Junction-Cases
Junction-Air
R
θJC
R
θJA
5
65
°C / W
°C /W
Operating Temperature Range T
OPR
0 ~ +125
°C
Storage Temperature Range T
STG
- 65 ~ +150
°C
Characteristic Symbol Test Conditions Min Typ Max Unit
TJ =+25°C
- 4.8 - 5.0 - 5.2
Output Voltage V
O
IO = 5mA to 1A, PO 15W
VI = -7 to -20V
- 4.75 -5.0 - 5.25
V
VI = -7 to -20V
IO=1A
5 50
VI = -8 to -12V
IO=1A
2 25
VI = -7.5 to -25V
7 50
VI= -8 to -12V
IO=1A
7 50
IO = 5mA to 1.5A
10 100
TJ =+25°C
IO = 250 to 750mA
3 50
Quiescent Current I
Q
TJ =+25°C
3 6 mA
IO = 5mA to 1A 0.05 0.5
VI = -8 to -25V 0.1 0.8
Temperature Coefficient of V
D
∆VO/∆T
IO = 5mA - 0.4
mV/°C
Output Noise Voltage V
N
f = 10Hz to 100KHz
TA =+25°C
40
µV
Ripple Rejection RR
f = 120Hz, IO = -35V
∆VI = 10V
54 60 dB
Dropout Voltage V
D
TJ=+25°C
IO = 1A
2 V
Short Circuit Current I
SC
TJ =+25°C, VI = -35V
300 mA
Peak Current I
PK
TJ =+25°C
2.2 A
Load Regulation
∆
V
O
Line Regulation
∆
V
O
TJ =25°C
mV
mV
Quiescent Current Change
∆
I
Q
mA
LM79XX/A (KA79XX, MC79XX) FIXED VOLTAGE REGULATOR (NEGATIVE)
LM7906 ELECTRICAL CHARACTERISTICS
(V
I
= 11V, lO = 500mA, 0°C ≤TJ≤ +125°C, CI =2.2µF, CO = 1µF, unless otherwise specified.)
* 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.
Characteristic Symbol Test Conditions Min Typ Max Unit
TJ = +25°C
- 5.75 - 6 - 6.25
Output Voltage V
O
IO = 5mA to 1A, PO 15W
VI = - 9 to - 21V
- 5.7 - 6 - 6.3
V
VI = - 8 to - 25V 10 120
VI= - 9 to -12V 5 60
TJ =+ 25°C
IO = 5mA to 1.5A
10 120
TJ =+ 25°C
IO = 250 to 750mA
3 60
Quiescent Current I
Q
TJ =+ 25°C
3 6 mA
IO = 5mA to 1A 0.5
VI = -9 to -25V 1.3
Temperature Coefficient of V
D
∆VO/∆T
IO = 5mA -0.5
mV/°C
Output Noise Voltage V
N
f = 10Hz to 100KHz
TA =+ 25°C
130
µV
Ripple Rejection RR
f = 120Hz
∆VI = 10V
54 60 dB
Dropout Voltage V
D
TJ=+ 25°C
IO = 1A
2 V
Short Circuit Current I
SC
TJ= +25°C, VI = -35V
300 mA
Peak Current I
PK
TJ= +25°C
2.2 A
Line Regulation
∆
V
O
TJ = 25°C
∆
V
O
Load Regulation mV
mV
Quiescent Current Change
∆
I
Q mA
LM79XX/A (KA79XX, MC79XX) FIXED VOLTAGE REGULATOR (NEGATIVE)
LM7908 ELECTRICAL CHARACTERISTICS
(V
I
= 14V, lO = 500mA, 0°C ≤TJ ≤ +125°C, CI =2.2µF, CO = 1µF, unless otherwise specified.)
* 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.
Characteristic Symbol Test Conditions Min Typ Max Unit
TJ =+ 25°C
- 7.7 - 8 - 8.3
Output Voltage V
O
IO = 5mA to 1A, PO 15W
VI = -1.5 to -23V
- 7.6 - 8 - 8.4
V
VI = -10.5 to -25V 10 100
VI= -11 to -17V 5 80
TJ =+ 25°C
IO = 5mA to 1.5A
12 160
TJ =+ 25°C
IO = 250 to 750mA
4 80
Quiescent Current I
Q
TJ =+ 25°C
3 6 mA
IO = 5mA to 1A 0.05 0.5
VI = -11.5 to -25V 0.1 1
Temperature Coefficient of V
D
∆VO/∆T
IO = 5mA -0.6
mV/°C
Output Noise Voltage V
N
f = 10Hz to 100KHz
TA =+ 25°C
175
µV
Ripple Rejection RR
f = 120Hz
∆VI = 10V
54 60 dB
Dropout Voltage V
D
TJ=+ 25°C
IO = 1A
2 V
Short Circuit Current I
SC
TJ=+ 25°C, VI = -35V
300 mA
Peak Current I
PK
TJ=+ 25°C
2.2 A
Line Regulation
∆
V
O
Load Regulation
∆
V
O
mV
mV
TJ = 25°C
Quiescent Current Change
∆
I
Q
mA
LM79XX/A (KA79XX, MC79XX) FIXED VOLTAGE REGULATOR (NEGATIVE)
LM7909 ELECTRICAL CHARACTERISTICS
(V
I
= 14V, lO = 500mA, 0°C ≤TJ ≤+ 125°C, CI =2.2µF, CO = 1µF, unless otherwise specified)
* 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.
Characteristic Symbol Test Conditions Min Typ Max Unit
TJ =+ 25°C
- 8.7 - 9.0 - 9.3
Output Voltage V
O
IO = 5mA to 1A, PO 15W
VI = -1.5 to -23V
- 8.6 - 9.0 - 9.4
V
VI = -10.5 to -25V 10 180
VI= -11 to -17V 5 90
TJ =+ 25°C
IO = 5mA to 1.5A
12 180
TJ =+ 25°C
IO = 250 to 750mA
4 90
Quiescent Current I
Q
TJ =+ 25°C
3 6 mA
IO = 5mA to 1A 0.05 0.5
VI = -11.5 to -25V 0.1 1
Temperature Coefficient of V
D
∆VO/∆T
IO = 5mA -0.6
mV/°C
Output Noise Voltage V
N
f = 10Hz to 100KHz
TA =+ 25°C
175
µV
Ripple Rejection RR
f = 120Hz
∆VI = 10V
54 60 dB
Dropout Voltage V
D
TJ=+ 25°C
IO = 1A
2 V
Short Circuit Current I
SC
TJ= +25°C, VI = -35V
300 mA
Peak Current I
PK
TJ =+25°C
2.2 A
Line Regulation
∆
V
O
Load Regulation
∆
V
O
mV
mV
TJ = 25°C
Quiescent Current Change
∆
I
Q
mA
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