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LM7905 Datasheet

LM79XX Series 3-Terminal Negative Regulators

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November 1994
LM79XX Series 3-Terminal Negative Regulators
General Description
The LM79XX series of 3-terminal regulators is available with
fixed output voltages of b5V b8V b12V and b15V
These devices need only one external component a com-
pensation capacitor at the output The LM79XX series is
packaged in the TO-220 power package and is capable of
supplying 1 5A of output current
These regulators employ internal current limiting safe area
protection and thermal shutdown for protection against vir-
tually all overload conditions
Low ground pin current of the LM79XX series allows output
voltage to be easily boosted above the preset value with a
resistor divider The low quiescent current drain of
these devices with a specified maximum change with line
and load ensures good regulation in the voltage boosted
mode
For applications requiring other voltages see LM137 data
sheet
Features
Y Thermal short circuit and safe area protection
Y High ripple rejection
Y 1 5A output current
Y 4% tolerance on preset output voltage
Connection Diagrams
TO-220 Package
Typical Applications
Fixed Regulator
Front View
TL H 7340 – 14
Order Number LM7905CT LM7912CT or LM7915CT
See NS Package Number TO3B
TL H 7340 – 3
Required if regulator is separated from filter capacitor by
more than 3 For value given capacitor must be solid
tantalum 25 mF aluminum electrolytic may be substituted
Required for stability For value given capacitor must be
solid tantalum 25 mF aluminum electrolytic may be substi-
tuted Values given may be increased without limit
For output capacitance in excess of 100 mF a high current
diode from input to output (1N4001 etc ) will protect the
regulator from momentary input shorts
C1995 National Semiconductor Corporation TL H 7340
RRD-B30M115 Printed in U S A


National Semiconductor Electronic Components Datasheet

LM7905 Datasheet

LM79XX Series 3-Terminal Negative Regulators

No Preview Available !

Absolute Maximum Ratings (Note 1)
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
Input Voltage
(Vo e b5V)
(Vo e b12V and b15V)
b25V
b35V
Input-Output Differential
(Vo e b5V)
(Vo e b12V and b15V)
Power Dissipation (Note 2)
25V
30V
Internally Limited
Operating Junction Temperature Range 0 C to a125 C
Storage Temperature Range
b65 C to a150 C
Lead Temperature (Soldering 10 sec )
230 C
Electrical Characteristics Conditions unless otherwise noted IOUT e 500 mA CIN e 2 2 mF COUT e 1 mF
0 C s TJ s a125 C Power Dissipation s 1 5W
Part Number
LM7905C
Output Voltage
Input Voltage (unless otherwise specified)
b5V
b10V
Units
Symbol
Parameter
Conditions
Min Typ Max
VO
DVO
DVO
IQ
DIQ
Vn
IOMAX
Output Voltage
Line Regulation
TJ e 25 C
5 mA s IOUT s 1A
P s 15W
TJ e 25 C (Note 3)
Load Regulation
Quiescent Current
Quiescent Current
Change
Output Noise Voltage
Ripple Rejection
TJ e 25 C (Note 3)
5 mA s IOUT s 1 5A
250 mA s IOUT s 750 mA
TJ e 25 C
With Line
With Load 5 mA s IOUT s 1A
TA e 25 C 10 Hz s f s 100 Hz
f e 120 Hz
Dropout Voltage
Peak Output Current
Average Temperature
Coefficient of
Output Voltage
TJ e 25 C IOUT e 1A
TJ e 25 C
IOUT e 5 mA
0 C s TJ s 100 C
b4 8
b5 0
b5 2
b4 75
b5 25
(b20 s VIN s b7)
8
(b25 s VIN s b7)
2
(b12 s VIN s b8)
50
15
15 100
5 50
12
(b25 s VIN s b7)
05
05
125
54 66
(b18 s VIN s b8)
11
22
04
V
V
V
mV
V
mV
V
mV
mV
mA
mA
V
mA
mV
dB
V
V
A
mV C
Typical Applications (Continued)
Variable Output
Improves transient response and ripple rejection Do not increase beyond 50 mF
 JR1 a R2
VOUT e VSET
R2
Select R2 as follows
LM7905CT 300X
LM7912CT 750X
LM7915CT 1k
2
TL H 7340 – 2


Part Number LM7905
Description LM79XX Series 3-Terminal Negative Regulators
Maker National Semiconductor
Total Page 10 Pages
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