TL H 7754
LM104LM204LM304
Negative
Regulator
March 1989
LM104 LM204 LM304 Negative Regulator
General Description
The LM104 series are precision voltage regulators which
can be programmed by a single external resistor to supply
any voltage from 40V down to zero while operating from a
single unregulated supply They can also provide 0 01-per-
cent regulation in circuits using a separate floating bias
supply where the output voltage is limited only by the
breakdown of external pass transistors Although designed
primarily as linear series regulators the circuits can be used
as switching regulators current regulators or in a number of
other control applications Typical performance characteris-
tics are
Y
Subsurface zener reference
Y
1 mV regulation no load to full load
Y
0 01% V line regulation
Y
0 2 mV V ripple rejection
Y
0 3% temperature stability over military temperature
range
The LM104 series is the complement of the LM105 positive
regulator intended for systems requiring regulated negative
voltages which have a common ground with the unregulated
supply By themselves they can deliver output currents to
25 mA but external transistors can be added to get any
desired current The output voltage is set by external resis-
tors and either constant or foldback current limiting is made
available
The LM104 is specified for operation over the
b
55 C to
a
125 C military temperature range The LM204 is specified
for operation over the
b
25 C to
a
85 C temperature range
The LM304 is specified for operation from 0 C to
a
70 C
Schematic Diagram
TL H 7754 1
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 6)
LM104 LM204
LM304
Input Voltage
50V
40V
Input-Output Voltage Differential
50V
40V
Power Dissipation (Note 1)
500 mW
500 mW
Operating Temperature Range
LM104
b
55 C to
a
125 C
LM204
b
25 C to
a
85 C
LM304
0 C to
a
70 C
Storage Temperature Range
b
65 C to
a
150 C
b
65 C to
a
150 C
Lead Temperature (Soldering 10 sec )
260 C for plastic
300 C for hermetic
Electrical Characteristics
Parameter
Conditions
LM104 LM204
LM304
Units
Min
Typ
Max
Min
Typ
Max
Input Voltage Range
b
50
b
8
b
40
b
8
V
Output Voltage Range
b
40
b
0 015
b
30
b
0 035
V
Output-Input Voltage
I
O
e
20 mA
2 0
50
2 0
40
V
Differential (Note 3)
I
O
e
5 mA
0 5
50
0 5
40
V
Load Regulation (Note 4)
O
s
I
O
s
20 mA
R
SC
e
15X
1
5
1
5
mV
Line Regulation (Note 5)
V
OUT
s
b
5V
D
V
IN
e
0 1 V
IN
0 056
0 1
0 056
0 1
%
Ripple Rejection
C
19
e
10 mF f
e
120 Hz
V
IN
k
b
15V
0 2
0 5
0 2
0 5
mV V
b
7V
t
V
IN
t
b
15V
0 5
1 0
0 5
1 0
mV V
Output Voltage Scale Factor
R
2-3
e
2 4k
1 8
2 0
2 2
1 8
2 0
2 2
V kX
Temperature Stability
V
O
s
b
1V
0 3
1 0
0 3
1 0
%
Output Noise Voltage
10 Hz
s
f
s
10 kHz
V
O
s
b
5V C
1-9
e
0
0 007
0 007
%
C
1-9
e
10 mF
15
15
m
V
Standby Current Drain
I
L
e
5 mA V
O
e
0
1 7
2 5
1 7
2 5
mA
V
O
e b
30V
3 6
5 0
mA
V
O
e b
40V
3 6
5 0
mA
Long Term Stability
V
O
s
b
1V
0 01
1 0
0 01
1 0
%
Note 1
The maximum junction temperature of the LM104 is 150 C while that of the LM204 is 125 C and LM304 is 100 C For operating at elevated temperatures
devices in the H10C package must be derated based on a thermal resistance of 150 C W junction to ambient or 45 C W junction to case
Note 2
These specifications apply for junction temperatures between
b
55 C and 150 C (between
b
25 C and 100 C for the LM204 and 0 C to
a
85 C for the
LM304) and for input and output voltages within the ranges given unless otherwise specified The load and line regulation specifications are for constant junction
temperature Temperature drift effects must be taken into account separately when the unit is operating under conditions of high dissipation
Note 3
When external booster transistors are used the minimum output-input voltage differential is increased in the worst case by approximately 1V
Note 4
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 5
With zero output the dc line regulation is determined from the ripple rejection Hence with output voltages between 0V and
b
5V a dc output variation
determined from the ripple rejection must be added to find the worst-case line regulation
Note 6
Refer to RETS104X drawing for military specifications for the LM104
2
Typical Performance Characteristics
Load Regulation
Load Regulation
Current Limiting
Supply Voltage Rejection
Preregulated Reference Supply
Supply Voltage Rejection With
Ripple Rejection
Current Limit Sense Voltage
Regulator Dropout Voltage
Minimum Input Voltage
Line Transient Response
Load Transient Response
Standby Current Drain
TL H 7754 7
3
Connection Diagram
Metal Can Package
TL H 7754 2
Note
Pin 5 connected to case
Top View
Order Number LM104H LM204H or LM304H
See NS Package H10C
Typical Applications
Operating with Separate Bias Supply
Solid Tantalum
TL H 7754 3
Basic Regulator Circuit
Solid Tantalum
TL H 7754 5
Trim R1 for exact scale factor
High Current Regulator
Solid Tantalum
TL H 7754 4
Switching Regulator
Solid Tantalum
TL H 7754 6
60 turns
20 on Arnold Engineering A930157-2 Molybdenum Permalloy Core
4
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