TL H 7755
LM105LM205LM305LM305A
LM376
Voltage
Regulators
January 1995
LM105 LM205 LM305 LM305A
LM376 Voltage Regulators
General Description
The LM105 series are positive voltage regulators similar to
the LM100 except that an extra gain stage has been added
for improved regulation A redesign of the biasing circuitry
removes any minimum load current requirement and at the
same time reduces standby current drain permitting higher
voltage operation They are direct plug-in replacements for
the LM100 in both linear and switching regulator circuits
with output voltages greater than 4 5V Important character-
istics of the circuits are
Y
Output voltage adjustable from 4 5V to 40V
Y
Output currents in excess of 10A possible by adding
external transistors
Y
Load regulation better than 0 1% full load with current
limiting
Y
DC line regulation guaranteed at 0 03% V
Y
Ripple rejection on 0 01%V
Y
45 mA output current without external pass transistor
(LM305A)
Like the LM100 they also feature fast response to both load
and line transients freedom from oscillations with varying
resistive and reactive loads and the ability to start reliably on
any load within rating The circuits are built on a single sili-
con chip and are supplied in a TO-99 metal can
The LM105 is specified for operation for
b
55 C
s
T
A
s
a
125 C and the LM305 LM305A is specified for 0 C
s
T
A
s
a
70 C
Schematic and Connection Diagrams
TL H 7755 1
Metal Can Package
TL H 7755 3
Top View
Order Number LM105H LM105H 883
SMD
5962-8958801 LM305H or LM305AH
See NS Package Number H08C
C1995 National Semiconductor Corporation
RRD-B30M115 Printed in U S A
Absolute Maximum Ratings
If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office
Distributors for availability and specifications
(Note 5)
LM105
LM305
LM305A
Input Voltage
50V
40V
50V
Input-Output Differential
40V
40V
40V
Power Dissipation (Note 1)
800 mW
800 mW
800 mW
Operating Temperature Range
b
55 C to
a
125 C
b
0 C to
a
70 C
0 C to
a
70 C
Storage Temperature Range
b
65 C to
a
150 C
b
65 C to
a
150 C
b
65 C to
a
150 C
Lead Temperature (Soldering 10 seconds)
300 C
300 C
300 C
Electrical Characteristics
(Note 2)
Parameter
Conditions
LM105
LM305
LM305A
Units
Min
Typ
Max
Min
Typ
Max
Min
Typ
Max
Input Voltage Range
8 5
50
8 5
40
8 5
50
V
Output Voltage Range
4 5
40
4 5
30
4 5
40
V
Input-Output Voltage
3 0
30
3 0
30
3 0
30
V
Differential
Load Regulation
R
SC
e
10X T
A
e
25 C
0 02
0 05
0 02
0 05
%
(Note 3)
R
SC
e
10X T
A
e
T
A(MAX)
0 03
0 1
0 03
0 1
%
R
SC
e
10X T
A
e
T
A(MIN)
0 03
0 1
0 03
0 1
%
0
s
I
O
s
12 mA
0
s
I
O
s
12 mA
R
SC
e
0X T
A
e
25 C
0 02
0 2
%
R
SC
e
0X T
A
e
70 C
0 03
0 4
%
R
SC
e
0X T
A
e
0 C
0 03
0 4
%
0
s
I
O
s
45 mA
Line Regulation
T
A
e
25 C
% V
0 C
s
T
A
s
a
70 C
% V
V
IN
b
V
OUT
s
5V T
A
e
25 C
0 025
0 06
0 025
0 06
0 025
0 06
% V
V
IN
b
V
OUT
t
5V T
A
e
25 C
0 015
0 03
0 015
0 03
0 015
0 03
% V
Temperature Stability
T
A(MIN)
s
T
A
s
T
A(MAX)
0 3
1 0
0 3
1 0
0 3
1 0
%
2
Electrical Characteristics
(Note 2) (Continued)
Parameter
Conditions
LM105
LM305
LM305A
Units
Min
Typ
Max
Min
Typ
Max
Min
Typ
Max
Feedback Sense Voltage
1 63
1 7
1 81
1 63
1 7
1 81
1 55
1 7
1 85
V
Output Noise Voltage
10 Hz
s
f
s
10 kHz
C
REF
e
0
0 005
0 005
0 005
%
C
REF
e
0 1 mF
0 002
0 002
0 002
%
Standby Current Drain
V
IN
e
30V T
A
e
25 C
mA
V
IN
e
40V
0 8
2 0
mA
V
IN
e
50V
0 8
2 0
0 8
2 0
mA
Current Limit
T
A
e
25 C R
SC
e
10X
225
300
375
225
300
375
225
300
375
mV
Sense Voltage
V
OUT
e
0V (Note 4)
Long Term Stability
0 1
0 1
0 1
%
Ripple Rejection
C
REF
e
10 mF f
e
120 Hz
0 003
0 003
0 003
% V
i
JA
TO-99 Board Mount
230
230
230
C W
in Still Air
i
JA
TO-99 Board Mount in
92
92
92
C W
400 LF Min Air Flow
i
JC
TO-99
25
25
25
C W
Note 1
The maximum junction temperature of the LM105 and LM305A is 150 C and the LM305 is 85 C For operation at elevated temperatures devices in the
H08C package must be derated based on a thermal resistance of 168 C W junction to ambient or 25 C W junction to case Peak dissipations to 1W are allowable
providing the dissipation rating is not exceeded with the power average over a five second interval for the LM105 and averaged over a two second interval for the
LM305
Note 2
Unless otherwise specified these specifications apply for temperatures within the operating temperature range for input and output voltages within the
range given and for a divider impedance seen by the feedback terminal of 2 kX Load and line regulation specifications are for a constant junction temperature
Temperature drift effects must be taken into account separately when the unit is operating under conditions of high dissipation
Note 3
The output currents given as well as the load regulation can be increased by the addition of external transistors The improvement factor will be roughly
equal to the composite current gain of the added transistors
Note 4
With no external pass transistor
Note 5
Refer to RETS105X Drawing for military specifications for the LM105
3
Typical Performance Characteristics
LM105 LM305 LM305A
Load Regulation
Load Regulation
Characteristics
Current Limiting
Current Limit Sense Voltage
Short Circuit Current
Values
Optimum Divider Resistance
Minimum Input Voltage
Regulator Dropout Voltage
Supply Voltage Rejection
Minimum Output Voltage
Standby Current Drain
Transient Response
TL H 7755 6
4
Typical Applications
10A Regulator with Foldback Current Limiting
Solid tantalum
Electrolytic
TL H 7755 4
1 0A Regulator with Protective Diodes
Protects against shorted input or inductive leads on
unregulated supply
Protects against input voltage reversal
Protects against output voltage reversal
TL H 7755 5
Linear Regulator with Foldback Current Limiting
TL H 7755 8
Current Regulator
TL H 7755 9
5
Typical Applications
(Continued)
Shunt Regulator
TL H 7755 10
Switching Regulator
Solid tantaium
125 turns
e
22 on Arnold
Engineering A262123-2
molybdenum permally
core
TL H 7755 11
Basic Positive Regulator with Current Limiting
TL H 7755 12
1 0A Regulator with Protective Diodes
Protects against shorted
input or inductive loads on
unregulated supply
Protects against input
voltage reversal
Protects against output
voltage reversal
TL H 7755 13
Linear Regulator with Foldback Current Limiting
TL H 7755 14
6
7
LM105LM205LM305LM305A
LM376
Voltage
Regulators
Physical Dimensions
inches (millimeters)
Metal Can Package (H)
Order Number LM105H LM105H 883 SMD
5962-8958801 LM305H or LM305AH
NS Package Number H08C
LIFE SUPPORT POLICY
NATIONAL'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL
SEMICONDUCTOR CORPORATION As used herein
1 Life support devices or systems are devices or
2 A critical component is any component of a life
systems which (a) are intended for surgical implant
support device or system whose failure to perform can
into the body or (b) support or sustain life and whose
be reasonably expected to cause the failure of the life
failure to perform when properly used in accordance
support device or system or to affect its safety or
with instructions for use provided in the labeling can
effectiveness
be reasonably expected to result in a significant injury
to the user
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