79L12
D
D
D
D
D
D
3-Terminal Regulators
Output Current Up to 100 mA
No External Components Required
Internal Thermal-Overload Protection
Internal Short-Circuit Current Limiting
Direct Replacement for Motorola MC79L
12
Series
Negative-Voltage Regulators
OUTPUT
INPUT
COMMON
C
I
O
TO–92
79L12ACZ
description
This series of fixed negative-voltage integrated-circuit
SOT-89
voltage regulators is designed for a wide range of
applications. These include on-card regulation for
79L12CPK
COMMON
INPUT
OUTPUT
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
fective improvement in output impedance of two orders of magnitude, with lower bias
current.
electrical characteristics at specified virtual junction temperature, V
I
=
-19V, I
O
=40mA (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
TJ
‡
MIN
25°C
Output voltage
V 7 V t 20 V
to
I
1 mA to 40 mA
At
A
I
o
=1mA to 40mA,V
I
=-14.5V to -27V
IO = 1 mA to 70 mA
VI =
-14.5 to -27V
VI =
-16V to -27V
VI =
-15V to -25V
f = 120 Hz
IO = 1 mA to 100 mA
IO = 1 mA to 40 mA
f = 10 Hz to 100 kHz
Full range
Full range
25°C
25°C
25 C
25°C
25°C
25 C
25°C
25°C
25°C
125°C
VI =
-16V to -27V
IO = 1 mA to 40 mA
F ll
Full
Full
range
37
79L12
TYP
MAX
UNIT
-11.5
-11.4
-5
-12.5
-12.5
-12.5
250
200
V
-11.4
50
40
Input
voltage regulation
Ripple rejection
Output
voltage regulation
Output
noise voltage
Dropout voltage
mV
mV
dB
42
24
15
80
1.7
60
30
mV
µV
V
mV
Bias
c
current
Bias current
rrent
Bias
current change
6.5
6
1.5
0.1
mA
mA
mA
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-µF capacitor across the input and a 0.1-µF capacitor across the output. Full range for the 7
9L12 is T
J = 0°C to
70°C
Wing Shing Computer Components Co., (H.K.)Ltd.
Homepage:
http://www.wingshing.com
Tel:(852)2341 9276 Fax:(852)2797 8153
E-mail: wsccltd@hkstar.com
3-1
WINGS [ WING SHING COMPUTER COMPONENTS ]
