TIGER ELECTRONIC CO.,LTD
3-Terminal 1A Positive Voltage Regulator
GENERAL DESCRIPTION
The LM7912 series of three terminal positive regulators are available in the TO-220 package and with
several fixed output voltages, making them useful in a wide range of applications. Each type employs
internal current limiting, thermal shut down and safe operating area protection, making it essentially
indestructible. If adequate heat sinking is provided, they can deliver over 1A output current. Although
designed primarily as fixed voltage regulators, these devices can be used with external components to
obtain adjustable voltages and currents.
O
Product specification
LM7912
ABSOLUTE MAXIMUM RATINGS ( Ta = 25 C)
Parameter
Input Voltage
Output Voltage
Peak Current
Operating Temperature
Range
Storage Temperature Range
Symbol
V
I
V
O
I
PK
T
OPR
T
STG
Typ
-35
-12
-2.2
0~125
-65~150
Unit
V
V
A
o
C
C
o
TO-220
ELECTRICAL CHARACTERISTICS ( Ta = 25 C)
(Refer to test circuit, Io = -500mA, Vi = -18V, Ci= 2.2uF, Co=1.0uF unless otherwise specified)
Parameter
Output Voltage
Line Regulation (Note1)
Symbol
V
O
Regline
Test Conditions
V
I
= -14.5V to -30V
V
I
= -14.5V to -30V
V
I
= -16V to -22V
Load Regulation (Note1)
Quiescent Current
Quiescent Current Change
Ripple Rejection
Dropout Voltage
Short Circuit Current
Peak Current
Regload
I
Q
I
Q
RR
V
Drop
I
SC
I
PK
I
O
= -5.0mA to-1.5A
I
O
=-250mA to -750mA
T
J
=+25
o
C
I
O
= -5mA to -1A
V
I
= -15V to -30V
f = 120Hz, V
O
= -15V to -25V
I
O
= -1A, T
J
=+25
o
C
V
I
= -35V, T
A
=+25
o
C
T
J
=+25
o
C
54
60
-2
-300
-2.2
Min
-11.64
Typ
-12
-12
-6.0
-12
-4
-3
Max
-12.36
-240
mV
-120
-240
-120
-6
-0.5
mA
-1.0
dB
V
mA
A
mA
mV
Unit
V
O
TGS [ Tiger Electronic Co.,Ltd ]
