D
3-Terminal Regulators
D
Output Current Up to 100 mA
D
No External Components Required
D
Internal Thermal-Overload Protection
D
Internal Short-Circuit Current Limiting
D
Direct Replacement for Motorola MC79L
Series
description
This series of fixed negative-voltage integrated-circuit
voltage regulators is designed for a wide range of
applications.
These include on-card regulation for
elimination of noise and distribution problems
associated
with single-point regulation. In addition,
they can be used to control series pass elements to make high-current voltage-regulator circuits. One of these
regulators can deliver up to 100 mA of output current. The internal current-limiting and thermal-shutdown features
make them essentially immune to overload. When used as a replacement for a zener-diode and resistor combination,
these devices can provide ef
current.
TO92
electrical characteristics at specified virtual junction temperature, V
I
=
otherwise noted)
PARAMETER
TEST CONDITIONS
TJ
UNIT
J
MIN
TYP
MAX
V
7 V to 20 V
I
1 mA to 40 mA
25
C
Output voltage
V
7 V t
o
20 V
I
1
A t 40
A
Full range
V
IO = 1 mA to 70 mA
Full range
Input
VI =
25
C
mV
voltage regulation
VI =
25
C
mV
Ripple rejection
VI =
f = 120 Hz
25
C
dB
Output
IO = 1 mA to 100 mA
25
C
mV
voltage regulation
IO = 1 mA to 40 mA
25
C
mV
Output
noise voltage
f = 10 Hz to 100 kHz
25
C
V
Dropout voltage
25
C
1.7
V
Bias current
25
C
mA
Bias c rrent
125
C
mA
Bias
VI =
Full range
1.5
mA
current change
IO = 1 mA to 40 mA
F ll range
0.1
mA
Pulse-testing techniques maintain TJ as close to TA as possible. Thermal effects must be taken into account separately. All characteristics are
measured with a 0.33-
F capacitor across the input and a 0.1-
F capacitor across the output. Full range for the 7
J = 0
C to
70
C
Wing Shing Computer Components Co., (H.K.)Ltd.
Tel:(852)2341 9276 Fax:(852)2797 8153
Homepage:
http://www.wingshing.com
E-mail: wsccltd@hkstar.com
79L18
Negative-Voltage Regulators
OUTPUT
INPUT
COMMON
9L18 is T
-17.3
-18
-18.7
-17.1
-18.9
-17.1
-18.9
70
27
19
150
mV
mA
mA
mV
25 C
25 C
Full
Bias current
I =1mA to 40mA,V =-20.5 to -33V
-23V to -33V
-21V to -33V
-21V to -33V
SOT-89
COMMON
INPUT OUTPUT
18
I
275
60
33
48
6.5
6
325
-26V, I =40mA
O
fective improvement in output impedance of two orders of magnitude, with lower bias
79L18ACZ
79L18CPK
3-1
-20.5 to -33V
170
85
79L18
C
O
I
equivalent schematic
OUTPUT
INPUT
COMMON
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Input voltage: 79L
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air, case, or virtual junction temperature
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature 1.6 mm (1/16 inch) from case for 10 seconds
260
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
65
C to 150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
recommended operating conditions
MIN
MAX
UNIT
79L
Input voltage, VI
V
Output current, IO
100
mA
Operating virtual junction temperature, TJ
0
C
WS
79L18
-35V
150
70
18
18
3-2
-20.5 -33
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