NSC LM342P-12 3-terminal positive regulator Datasheet

LM342 Series
3-Terminal Positive Regulators
General Description
The LM342-XX series of three-terminal regulators is available with several fixed output voltages, making them useful
in a wide range of applications. One of these is local on card
regulation, eliminating the distribution problems associated
with single point regulation. The voltages available allow
these regulators to be used in logic systems, instrumentation, HiFi, and other solid state electronic equipment. Although designed primarily as fixed voltage regulators these
devices can be used with external components to obtain
adjustable voltages and currents.
The LM342-XX series is available in the plastic TO-202
package. This package allows these regulators to deliver
over 0.25A if adequate heat sinking is provided. Current limiting is included to limit the peak output current to a safe
value. Safe area protection for the output transistor is provided to limit internal power dissipation. If internal power
dissipation becomes too high for the heat sinking provided,
the thermal shutdown circuit takes over, preventing the IC
from overheating.
Considerable effort was expended to make the LM342-XX
series of regulators easy to use and minimize the number of
external components. It is not necessary to bypass the
output, although this does improve transient response. Input
bypassing is needed only if the regulator is located far from
the filter capacitor of the power supply.
For output voltage other than 5V, 12V and 15V the LM117
series provides an output voltage range from 1.2V to 57V.
Features
Y
Y
Y
Y
Y
Y
Y
Output current in excess of 0.25A
Internal thermal overload protection
No external components required
Output transistor safe area protection
Internal short circuit current limit
Available in plastic TO-202 package
Special circuitry allows start-up even if output is pulled
to negative voltage ( g supplies)
Voltage Range
LM342-5.0
LM342-12
LM342-15
5V
12V
15V
Schematic Diagram
TL/H/10485 – 1
C1995 National Semiconductor Corporation
TL/H/10485
RRD-B30M115/Printed in U. S. A.
LM342 Series 3-Terminal Positive Regulators
June 1989
Absolute Maximum Ratings (Note 1)
Input Voltage
VO e 5V
VO e 12V and 15V
b 65§ C to a 150§ C
Lead Temperature (Soldering, 10 sec.)
300§ C
TBD
ESD Susceptibility
30V
35V
Internally Limited
0§ C to a 70§ C
Internal Power Dissipation
Operating Temperature Range
125§ C
Maximum Junction Temperature
Storage Temperature Range
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Electrical Characteristics TA e 0§ C to a 70§ C, IO e 250 mA (Note 2) unless noted
Symbol
VO
Output Voltage
5V
12V
15V
Input Voltage (unless otherwise noted)
10V
19V
23V
Parameter
Output Voltage
(Note 3)
Conditions
Units
Min Typ Max Min Typ Min
Min
TJ e 25§ C
4.8
14.4
15.6
V
1 mA s IO s 250 mA and
VMIN s VIN s VMAX
4.75
5.25 11.4
12.6 14.25
15.75
(7.5sVINs20) (14.8sVINs27)
(18sVINs30)
V
DVO
Line Regulation
TJ e 25§ C, IO e 250 mA
DVO
Load Regulation
TJ e 25§ C, 1 mA s IO s 250 mA
DVO
Long Term Stability
IQ
Quiescent Current
TJ e 25§ C
DIQ
Quiescent Current
Change
TJ e 25§ C, 1 mA s IO s 250 mA
5
5.2
55
(7.3sVINs25)
11.5
Vn
Output Noise Voltage TJ e 25§ C, f e 10 Hz–10 kHz
DVIN
DVOUT
Ripple Rejection
f e 120 Hz
Input Voltage
Required to Maintain
Line Regulation
TJ e 25§ C, IO e 250 mA
Thermal Resistance
Junction to Case
P Package
Thermal Resistance
Junction to Ambient
P Package
12.5
100
(14.6sVINs30)
50
Typ Max
15
100
(17.7sVINs30)
120
20
TJ e 25§ C, VMIN s VIN s VMAX
12
150
48
60
mV
mV
mV/khrs
6
6
6
mA
0.5
0.5
0.5
mA
1.5
(7.3sVINs25)
1.5
(14.6sVINs30)
1.5
(17.7sVINs30)
mA
40
96
120
mV
56
dB
50
64
7.3
44
56
14.6
42
17.7
V
15
15
15
§ C/W
80
80
80
§ C/W
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.
Note 2: The electrical characteristics data represent pulse test conditions with junction temperatures as shown at the initiation of tests.
Note 3: The temperature coefficient of VOUT is typically within 0.01% VO/§ C.
2
Typical Performance Characteristics
Maximum Average Power
Dissipation (TO-202 Package)
Peak Output Current
Dropout Voltage
Ripple Rejection
Ripple Rejection
Output Impedance
Quiescent Current
Quiescent Current
TL/H/10485 – 3
3
Connection Diagram
Typical Applications
TO-202 (P) Plastic Package
Fixed Output Regulator
TL/H/10485 – 4
*Required if the regulator is located far from power supply filter
**Although not required, C2 does improve transient response. (If needed, use 0.1 mF ceramic disc.)
Adjustable Output Regulator
TL/H/10485–2
Order Number LM342P-5.0,
LM342P-12 or LM342P-15
See NS Package Number P03A
TL/H/10485 – 5
VO e 5V a (5V/R1 a IQ) R2
5V/R1 l 3IQ, Load Regulation (LR) e [(R1 a R2)/R1] c (Lr of LM342-05)
Current Regulator
TL/H/10485 – 6
IOUT e V2b3/R1 a IQ
DIQ s 1.5 mA over line and load changes
4
Typical Applications (Continued)
High Output Voltage Regulator
TL/H/10485 – 7
*Necessary if regulator is located far from the power supply filter
**D3 aids in full load start-up and protects the regulator during short circuits from high input to output voltage differentials
g 15V, 250 mA Dual Power Supply
TL/H/10485 – 8
Variable Output Regulator 0.5V – 18V
VOUT e VG a 5V, R1 e ( b VIN/IQ LM342)
VOUT e 5V(R2/R4) for (R2 a R3) e (R4 a R5)
A 0.5V output will correspond to (R2/R4) e 0.1, (R3/R4) e 0.9
TL/H/10485 – 9
*Solid tantalum
5
LM342 Series 3-Terminal Positive Regulators
Physical Dimensions inches (millimeters)
TO-202 Plastic Package (P)
Order Numbers LM342P-5.0, LM342P-12 or LM342P-15
NS Package Number P03A
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