NEGATIVE VOLTAGE REGULATOR
LM7908
TO-220
Plastic Package
Voltage Regulators, these Device can be used with External Components to obtain Adjustable
Output Voltage and Current and also as the Power Pass Element in Precision Regulators
ABSOLUTE MAXIMUM RATINGS
SYMBOL
UNIT
V
IN
V
Power Dissipation T
a
=25ºC P
D
W
Power Dissipation T
C
=25ºC P
D
W
T
j
ºC
T
stg
ºC
T
L
ºC
Recommended Operating Conditions
SYMBOL MIN TYP MAX UNIT
V
I
-10.5 -25 V
I
O
1.5 A
T
j
0 125 ºC
ELECTRICAL CHARACTERISTICS
(At Specified Virtual Junction Temperature, V
I
= -14V, I
O
=500mA, (unless specified otherwise)
DESCRIPTION SYMBOL *TEST CONDITION MIN TYP MAX UNIT
Output Voltage 25ºC -7.7 -8.3 V
I
O
=5mA to 1A, 0ºC to 125ºC
V
I
= -10.5V to -23V, P <15W, 0ºC to 125ºC
V
I
= -10.5V to -25V, 25ºC
160 mV
V
I
= -11 to -17V, 25ºC
80 mV
Ripple Rejection
R
R
V
I
= -11.5V to -21.5V, f=120Hz, 0º to 125ºC
54 dB
I
O
=5mA to1.5A, 25ºC
160 mV
I
O
=250mA to 750mA, 25ºC
80 mV
Temperature Coefficient of
Output Voltage
∆V
O
/∆T
I
O
=5mA , 0ºC to 125ºC
- 0.6 mV/ºC
Output Noise Voltage
V
NO
f=10Hz to 100KHz, 25ºC 200
µV
Dropout Voltage
V
DIF (min)
I
O
=1A , 25ºC
1.1 V
*Pulse testing techniques are used to maintain the junction temperature as close to the ambient temperature as
possible. Thermal effects must be taken into account separately.
**This specification applies only for DC power dissipation permitted by absolute maximum rating.
LM7908Rev011205E
2.0
**V
O
- 65 to +150
Input Voltage
Output Current
Operating Junction Temperature
DESCRIPTION
Load Regulation
R
BGL
DESCRIPTION
Input Voltage
Operating Free Air, Case or Virtual
Junction Temperature Range
Lead Temperature 3.2mm (1/8 inch) from
Case for 10 seconds
Storage Temperature Range
Line Regulation
R
BGIN
VALUE
-35
260
0 to 150
V
15
-7.6 -8.4
Continental Device India Limited
Data Sheet Page 1 of 3
Continental Device India Limited
An ISO/TS 16949, ISO 9001 and ISO 14001 Certified Company
NEGATIVE VOLTAGE REGULATOR LM7908
TO-220
Plastic Package
ELECTRICAL CHARACTERISTICS
(At Specified Virtual Junction Temperature, V
I
= -14V, I
O
=500mA, (unless specified otherwise)
DESCRIPTION SYMBOL *TEST CONDITION MIN TYP MAX UNIT
Quiescent Current
I
Q
25ºC 2.0 mA
Quiescent Current Change
∆I
QIN
V
I
= -10.5V to -25V, 0ºC to 125ºC
1.0 mA
∆I
QL
I
O
=5mA to 1A, 0ºC to 125ºC
0.5 mA
Peak Output Current
I
omax
25ºC 2.1 A
*Pulse testing techniques are used to maintain the junction temperature as close to the ambient temperature as
possible. Thermal effects must be taken into account separately.
LM7908Rev011205E
Continental Device India Limited
Data Sheet Page 2 of 3