LM104
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 characteristics are:
YSubsurface zener reference
Y1 mV regulation no load to full load
Y0.01%/V line regulation
Y0.2 mV/V ripple rejection
Y0.3% 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 resistors, and either constant or foldback current limiting is made available.
The LM104 is specified for operation over the b55§C to a125§C military temperature range. The LM204 is specified for operation over the b25§C to a85§C temperature range. The LM304 is specified for operation from 0§C to a70§C.
Schematic Diagram
TL/H/7754 ± 1
Regulator Negative LM104/LM204/LM304
C1995 National Semiconductor Corporation |
TL/H/7754 |
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) |
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LM104/LM204 |
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LM304 |
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Input Voltage |
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50V |
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40V |
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Input-Output Voltage Differential |
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50V |
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40V |
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Power Dissipation (Note 1) |
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500 mW |
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500 mW |
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Operating Temperature Range |
b55§C to a125§C |
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LM104 |
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LM204 |
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b25§C to a85§C |
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0§C to a70§C |
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LM304 |
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Storage Temperature Range |
b65§C to a150§C |
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b65§C to a150§C |
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Lead Temperature (Soldering, 10 sec.) |
260§C for plastic |
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300§C for hermetic |
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Electrical Characteristics |
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Parameter |
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Conditions |
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LM104/LM204 |
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LM304 |
Units |
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Min |
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Typ |
Max |
Min |
Typ |
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Max |
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Input Voltage Range |
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b50 |
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b8 |
b40 |
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b8 |
V |
Output Voltage Range |
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b40 |
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b0.015 |
b30 |
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b0.035 |
V |
Output-Input Voltage |
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IO e 20 mA |
2.0 |
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50 |
2.0 |
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40 |
V |
Differential (Note 3) |
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IO e 5 mA |
0.5 |
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50 |
0.5 |
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40 |
V |
Load Regulation (Note 4) |
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O s IO s 20 mA |
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RSC e 15X |
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1 |
5 |
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1 |
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5 |
mV |
Line Regulation (Note 5) |
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VOUT s b5V |
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DVIN e 0.1 VIN |
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0.056 |
0.1 |
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0.056 |
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0.1 |
% |
Ripple Rejection |
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C19 e 10 mF, f e 120 Hz |
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VIN k b15V |
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0.2 |
0,.5 |
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0.2 |
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0.5 |
mV/V |
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b7V t VIN t b15V |
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0.5 |
1.0 |
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0.5 |
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1.0 |
mV/V |
Output Voltage Scale Factor |
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R2-3 e 2.4k |
1.8 |
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2.0 |
2.2 |
1.8 |
2.0 |
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2.2 |
V/kX |
Temperature Stability |
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VO s b1V |
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0.3 |
1.0 |
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0.3 |
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1.0 |
% |
Output Noise Voltage |
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10 Hz s f s 10 kHz |
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VO s b5V, C1-9 e 0 |
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0.007 |
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0.007 |
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% |
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C1-9 e 10 mF |
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15 |
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15 |
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mV |
Standby Current Drain |
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IL e 5 mA, VO e 0 |
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1.7 |
2.5 |
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1.7 |
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2.5 |
mA |
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VO e b30V |
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3.6 |
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5.0 |
mA |
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VO e b40V |
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3.6 |
5.0 |
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mA |
Long Term Stability |
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VO s b1V |
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0.01 |
1.0 |
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0.01 |
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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 b55§C and 150§C (between b25§C and 100§C for the LM204 and 0§C to a85§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.
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