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L18
2002
voltage monolithic integrated
circuit voltage regulators is designed for a wide
range of applications. These applications include
card regulation for elimination of noise and
point regulation. In addition, they can be used
current
voltage regulators. One of these regulators can
nal limiting and thermal shutdown features of
egulators male them essentially immune
to overload. When used as a replacement for a
resistor combination, an effective
improvement in output impedance can be obtain
NIKO-SEM
Positive-Voltage Regulator
GENERAL DESCRIPTION
Three-Terminal
FEATURES
L78
This Series of fixed-
ondistribution problems associated with single-
with power-pass elements to make highdeliver up to 100 mA of output current. The interthese r
zener diode-
-ed together with lower-bias current.
PIN CONFIGURAT IONS
l 3-terminal regulators
l Ou tput current up to 100 mA
l No external component
l Internal thermal overload protection
l Internal short-circuit current limiting
APPLICATION S
l Linear regulator
l Instrumentation
l Switching power supplies
l PCs, Industrial equipment
DEVICE SELECTION GUIDE
Device
Package
Marking
1
L78L18N
TO-92
78L18
MAR-04-
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L18
2002
NIKO-SEM
Positive-Voltage Regulator
Three-Terminal
L78
ABSOLUTE MAXIMUM RATINGS
PARAMETER VALUE
Input Voltage - V I 35V
Continuous total power dissipation (See Note 1)
Storage Temperature Range - T
Junction Temperature - TJ 125 °C
Lead Temperature (Soldering, 10 Seconds) - TL 260 °C
Note1: To avoid exceeding the design maximum virtual junction temperature, three ratings should not be exceeded. Due to variations in
individual device electrical characteristics and thermal resistance, the built-in thermal overload protection may be activated at power
levels slightly above or below the rated dissipation.
-55 to +150 °C
STG
DISSIPATION RATING TABLE 1 – FREE-AIR TEMPERATURE
PACKAGE
POWER RATING
TO-92 650 mW 6.2 mW/ °C 25 °C 350 mW
TA ≤ 25°C
† The TO-92 package dissipation rating is based on thermal resistance θJA measured in still air with the device mounted in an Augat socket.
The bottom of the package is 10mm (0.375 in) above the stock.
DERATING
FACTOR
DERATING
ABOVE TA
TA = 70°C
POWER RATING
DISSIPATION RATING TABLE 2 – CASE TEMPERATURE
PACKAGE
POWER RATING
TO-92 1600 mW 28.6 mW/°C 94 °C 713 mW
TA ≤ 25°C
DERATING
FACTOR
DERATING
ABOVE TC
TC = 125°C
POWER RATING
RECOMMENDED OPERATING CONDITIONS
PARAMETER VALUE
Input Voltage - V
I
L78L18
Output Current - I
100 mA (Max)
OUT
Operating Virtual Junction Temperature - TJ 0 to 125 °C
21V to 33V
2
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L18
2002
NIKO-SEM
Positive-Voltage Regulator
Three-Terminal
ELECTRICAL SPECIFICATIONS (L78L18)
(VI = 25V, IO = 40 mA, CI = 0.33 µF, CO = 0.1 µF, 0 °C < TJ < +125 °C unless otherwise noted.)
L78
PARAMETER TEST CONDITIONS MIN TYP MAX
Output Voltage TJ = +25 °C 17.3 18 18.7
Line Regulation
Load Regulation
Output Voltage
Input Bias Current
Input Bias Current Change
TJ = +25 °C
21V ≤ VI ≤ 33V
22V ≤ VI ≤ 33V
TJ = +25 °C
1.0 mA ≤ IO ≤ 100 mA
1.0 mA ≤ IO ≤ 40 mA
21V ≤ VI ≤ 33V, 1.0 mA ≤ IO ≤ 40 mA
21V ≤ VI ≤ VMAX, 1.0 mA ≤ IO ≤ 70 mA
17.1
17.1
145
135
30
15
300
250
170
18.9
18.9
TJ = +25 °C 2.0 6.0
21V ≤ VI ≤ 33V
1.5
1.0 mA ≤ IO ≤ 40 mA
Output Noise Voltage TA = +25 °C, 10 Hz ≤ f ≤ 100 KHz 150
Ripple Rejection
TJ = +25 °C, f = 120 Hz
34 48
23V ≤ VI ≤ 33V
Dropout Voltage TJ = +25 °C 1.7
85
0.1
UNITS
V
mV
mV
V
mA
mA
µV
dB
V
3
MAR-04-
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L18
2002
NIKO-SEM
Three-Terminal
L78
Positive-Voltage Regulator
TO-92 MECHANICAL DATA
Dimension
Min. Typ. Max.
mm mm
Dimension
Min. Typ. Max.
A 4.445 5.207 H 2.413 2.540 2.667
B 4.318 5.334 I 0.356 0.533
C 12.7 15.5 J
D 0.356 0.533 K
E 1.143 1.27 1.397 L
F 3.175 4.191 M
G 0.762 1.270 N
4
MAR-04-
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