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NEGATIVE VOLTAGE REGULATORS
L7900
SERIES
NEGATIVE VOLTAGE REGULATORS
n
OUTPUT CURRENT UP TO 1.5 A
OUTPUT VOLTAGES OF -5; -5.2; -6; -8; -9;
-12; -15; -18; -20; -22; -24V
n
THERMAL OVERLOAD PROTECTION
n
SHORT CIRCUIT PROTECTION
n
OUTPUT TRANSITION SOA PROTECTION
n
DESCRIPTION
The L7900 series of three-terminal negative
regulators is available in TO-220, ISOWATT220
TO-3 and D
2
PAK packages and several fixed
output voltages, making it useful in a wide range
of applications.These regulators can provide local
on-card regulation, eliminating the distribution
problems associated with single point regulation;
furthermore, having the same voltage option as
the L7800 positive standard series, they are
particularly suited for split power supplies. In
addition, the -5.2V is also available for ECL
system. If adequate heat sinking is provided,
they can deliver over 1.5A output current.
Although designed primarily as fixed voltage
regulators, these devices can be used with
external components to obtain adjustable
voltages and currents.
1
3
2
1
TO-3
D
2
PAK
3
2
1
TO-220
ISOWATT220
SCHEMATIC DIAGRAM
April 1997
1/13
L7900
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
i
DC Input Voltage (for V
O
= 5 to 18V)
(for V
O
= 20, 24V)
-35
-40
V
V
I
o
Output Current
Internally limited
P
tot
Power Dissipation
Internally limited
T
op
Operating Junction Temperature Range
0 to 150
o
C
T
stg
Storage Temperature Range
- 65 t o 150
o
C
THERMAL DATA
Symbol
Parameter
D
2
PAK
TO-220 ISOWATT220
TO-3
Unit
R
thj-case
R
th j-a mb
Thermal Resistance Junction-case Max
Thermal Resistance Junction-ambient Max
3
62.5
3
50
4
60
4
35
o
C/W
o
C/W
CONNECTION DIAGRAM AND ORDERING NUMBERS
(top view)
TO-220 & ISOWATT220
D
2
PAK
TO-3
Type
TO-220
D
2
PAK (*)
ISOWATT 220
TO-3
Output Voltage
L7905C
L7952C
L7906C
L7908C
L7912C
L7915C
L7918C
L7920C
L7922C
L7924C
L7905CV
L7952CV
L7906CV
L7908CV
L7912CV
L7915CV
L7918CV
L7920CV
L7922CV
L7924CV
L7905CD2T
L7952CD2T
L7906CD2T
L7908CD2T
L7912CD2T
L7915CD2T
L7918CD2T
L7920CD2T
L7922CD2T
L7924CD2T
L7905CP
L7905CT
L7952CT
L7906CT
L7908CT
L7912CT
L7915CT
L7918CT
L7920CT
L7922CT
L7924CT
-5V
-5.2V
-6V
-8V
-12V
-15V
-18V
-20V
-22V
-24V
L7906CP
L7908CP
L7912CP
L7915CP
L7918CP
L7920CP
L7924CP
(*) AVAILABLE IN TAPE AND REEL WITH ”-TR” SUFFIX
APPLICATION CIRCUIT
2/13
L7900
ELECTRICAL CHARACTERISTICS FOR L7905C
(refer to the test circuits, T
j
= 0 to 150
o
C,
V
i
= -10V, I
o
= 500 mA, C
i
= 2.2
m
F, C
o
=1
m
F unless otherwise specified)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
o
Output Voltage
T
j
=25
o
C
-4. 8
-5
-5. 2
V
V
o
Output Voltage
I
o
=-5mAto-1A P
o
3
15 W
-4.75
-5
-5.25
V
V
i
= 8 to 20 V
D
V
o
* Line Regulation
V
i
= -7 to -25 V T
j
=25
o
C
V
i
= -8 to -12 V T
j
=25
o
C
100
50
mV
mV
D
V
o
* Load Regulation
I
o
= 5 to 1500 mA T
j
=25
o
C
I
o
= 250 to 750 mA T
j
=25
o
C
100
50
mV
mV
I
d
Quiescent Current
T
j
=25
o
C
3
mA
D
I
d
Quiescent Current Change
I
o
= 5 to 1000 mA
0.5
mA
D
I
d
Quiescent Current Change
V
i
= -8 to -25 V
1.3
mA
D
V
o
D
Output Voltage Drift
I
o
= 5 mA
-0.4
mV/
o
C
T
e
N
Output Noise Voltage
B = 10Hz to 100KHz T
j
=25
o
C
100
m
V
SVR Supply Voltage Rejection
D
V
i
=10V f=120Hz
54
60
dB
V
d
Dropout Voltage
I
o
=1A
T
j
=25
o
C
1.4
V
D
V
O
= 100 mV
I
sc
Short Circuit Current
2. 1
A
I
scp
Short Circuit Peak Current
T
j
=25
o
C
2. 5
A
ELECTRICAL CHARACTERISTICS FOR L7952C
(refer to the test circuits, T
j
= 0 to 150
o
C,
V
i
= -10V, I
o
= 500 mA, C
i
= 2.2
m
F, C
o
=1
m
F unless otherwise specified)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
o
Output Voltage
T
j
=25
o
C
-5.0
-5.2
-5.4
V
V
o
Output Voltage
I
o
=-5mAto-1A P
o
3
15 W
-4.95
-5.2
-5.45
V
V
i
= -9 to -21 V
D
V
o
* Line Regulation
V
i
= -8 to -25 V T
j
=25
o
C
V
i
= -9 to -12 V T
j
=25
o
C
105
52
mV
mV
D
V
o
* Load Regulation
I
o
= 5 to 1500 mA T
j
=25
o
C
I
o
= 250 to 750 mA T
j
=25
o
C
105
52
mV
mV
I
d
Quiescent Current
T
j
=25
o
C
3
mA
D
I
d
Quiescent Current Change
I
o
= 5 to 1000 mA
0.5
mA
D
I
d
Quiescent Current Change
V
i
= -9 to -25 V
1.3
mA
D
V
o
D
Output Voltage Drift
I
o
= 5 mA
-0.5
mV/
o
C
T
e
N
Output Noise Voltage
B = 10Hz to 100KHz T
j
=25
o
C
125
m
V
SVR Supply Voltage Rejection
D
V
i
=10V f=120Hz
54
60
dB
V
d
Dropout Voltage
I
o
=1A
T
j
=25
o
C
1.4
V
D
V
O
= 100 mV
I
sc
Short Circuit Current
2
A
I
scp
Short Circuit Peak Current
T
j
=25
o
C
2. 5
A
* Load and line regulation are specified at constant junction temperature. Changes in V
o
due to heating effects must be taken into account
separately. Pulce testing with low duty cycle is used.
3/13
L7900
ELECTRICAL CHARACTERISTICS FOR L7906C
(refer to the test circuits, T
j
= 0 to 150
o
C,
V
i
= -11V, I
o
= 500 mA, C
i
= 2.2
m
F, C
o
=1
m
F unless otherwise specified)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
o
Output Voltage
T
j
=25
o
C
-5.75
-6
-6.25
V
V
o
Output Voltage
I
o
=-5mAto-1A P
o
3
15 W
-5. 7
-6
-6. 3
V
V
i
= -9.5 to -21.5 V
D
V
o
* Line Regulation
V
i
= -8.5 to -25 V T
j
=25
o
C
V
i
= -9 to -15 V T
j
=25
o
C
120
60
mV
mV
D
V
o
* Load Regulation
I
o
= 5 to 1500 mA T
j
=25
o
C
I
o
= 250 to 750 mA T
j
=25
o
C
120
60
mV
mV
I
d
Quiescent Current
T
j
=25
o
C
3
mA
D
I
d
Quiescent Current Change
I
o
= 5 to 1000 mA
0.5
mA
D
I
d
Quiescent Current Change
V
i
= -9.5 to -25 V
1.3
mA
D
V
o
D
Output Voltage Drift
I
o
= 5 mA
-0.6
mV/
o
C
T
e
N
Output Noise Voltage
B = 10Hz to 100KHz T
j
=25
o
C
144
m
V
SVR Supply Voltage Rejection
D
V
i
=10V f=120Hz
54
60
dB
V
d
Dropout Voltage
I
o
=1A
T
j
=25
o
C
1.4
V
D
V
O
= 100 mV
I
sc
Short Circuit Current
2
A
I
scp
Short Circuit Peak Current
T
j
=25
o
C
2. 5
A
ELECTRICAL CHARACTERISTICS FOR L7908C
(refer to the test circuits, T
j
= 0 to 150
o
C,
V
i
= -14V, I
o
= 500 mA, C
i
= 2.2
m
F, C
o
=1
m
F unless otherwise specified)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
o
Output Voltage
T
j
=25
o
C
-7. 7
-8
-8. 3
V
V
o
Output Voltage
I
o
=-5mAto-1A P
o
3
15 W
-7. 6
-8
-8. 4
V
V
i
= -11.5 to -23 V
D
V
o
* Line Regulation
V
i
= -10.5 to -25 V T
j
=25
o
C
V
i
= -11 to -17 V T
j
=25
o
C
160
80
mV
mV
D
V
o
* Load Regulation
I
o
= 5 to 1500 mA T
j
=25
o
C
I
o
= 250 to 750 mA T
j
=25
o
C
160
80
mV
mV
I
d
Quiescent Current
T
j
=25
o
C
3
mA
D
I
d
Quiescent Current Change
I
o
= 5 to 1000 mA
0.5
mA
D
I
d
Quiescent Current Change
V
i
= -11.5 to -25 V
1.3
mA
D
V
o
D
Output Voltage Drift
I
o
= 5 mA
-0.6
mV/
o
C
T
e
N
Output Noise Voltage
B = 10Hz to 100KHz T
j
=25
o
C
175
m
V
SVR Supply Voltage Rejection
D
V
i
=10V f=120Hz
54
60
dB
V
d
Dropout Voltage
I
o
=1A
T
j
=25
o
C
1.1
V
D
V
O
= 100 mV
I
sc
Short Circuit Current
1. 5
A
I
scp
Short Circuit Peak Current
T
j
=25
o
C
2. 5
A
* Load and line regulation are specified at constant junction temperature. Changes in V
o
due to heating effects must be taken into account
separately. Pulce testing with low duty cycle is used.
4/13
L7900
ELECTRICAL CHARACTERISTICS FOR L7912C
(refer to the test circuits, T
j
= 0 to 150
o
C,
V
i
= -19V, I
o
= 500 mA, C
i
= 2.2
m
F, C
o
=1
m
F unless otherwise specified)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
o
Output Voltage
T
j
=25
o
C
-11.5
-12
-12.5
V
V
o
Output Voltage
I
o
=-5mAto-1A P
o
3
15 W
-11.4
-12
-12.6
V
V
i
= -15.5 to -27 V
D
V
o
* Line Regulation
V
i
= -14.5 to -30 V T
j
=25
o
C
V
i
= -16 to -22 V T
j
=25
o
C
240
120
mV
mV
D
V
o
* Load Regulation
I
o
= 5 to 1500 mA T
j
=25
o
C
I
o
= 250 to 750 mA T
j
=25
o
C
240
120
mV
mV
I
d
Quiescent Current
T
j
=25
o
C
3
mA
D
I
d
Quiescent Current Change
I
o
= 5 to 1000 mA
0.5
mA
D
I
d
Quiescent Current Change
V
i
= -15 to -30 V
1
mA
D
V
o
D
Output Voltage Drift
I
o
= 5 mA
-0.8
mV/
o
C
T
e
N
Output Noise Voltage
B = 10Hz to 100KHz T
j
=25
o
C
200
m
V
SVR Supply Voltage Rejection
D
V
i
=10V f=120Hz
54
60
dB
V
d
Dropout Voltage
I
o
=1A
T
j
=25
o
C
1.1
V
D
V
O
= 100 mV
I
sc
Short Circuit Current
1. 5
A
I
scp
Short Circuit Peak Current
T
j
=25
o
C
2. 5
A
ELECTRICAL CHARACTERISTICS FOR L7915C
(refer to the test circuits, T
j
= 0 to 150
o
C,
V
i
= -23V, I
o
= 500 mA, C
i
= 2.2
m
F, C
o
=1
m
F unless otherwise specified)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
o
Output Voltage
T
j
=25
o
C
-14.4
-15
-15.6
V
V
o
Output Voltage
I
o
=-5mAto-1A P
o
3
15 W
-14.3
-15
-15.7
V
V
i
= -18.5 to -30 V
D
V
o
* Line Regulation
V
i
= -17.5 to -30 V T
j
=25
o
C
V
i
= -20 to -26 V T
j
=25
o
C
300
150
mV
mV
D
V
o
* Load Regulation
I
o
= 5 to 1500 mA T
j
=25
o
C
I
o
= 250 to 750 mA T
j
=25
o
C
300
150
mV
mV
I
d
Quiescent Current
T
j
=25
o
C
3
mA
D
I
d
Quiescent Current Change
I
o
= 5 to 1000 mA
0.5
mA
D
I
d
Quiescent Current Change
V
i
= -18.5 to -30 V
1
mA
D
V
o
D
Output Voltage Drift
I
o
= 5 mA
-0.9
mV/
o
C
T
e
N
Output Noise Voltage
B = 10Hz to 100KHz T
j
=25
o
C
250
m
V
SVR Supply Voltage Rejection
D
V
i
=10V f=120Hz
54
60
dB
V
d
Dropout Voltage
I
o
=1A
T
j
=25
o
C
1.1
V
D
V
O
= 100 mV
I
sc
Short Circuit Current
1. 3
A
I
scp
Short Circuit Peak Current
T
j
=25
o
C
2. 2
A
* Load and line regulation are specified at constant junction temperature. Changes in V
o
due to heating effects must be taken into account
separately. Pulce testing with low duty cycle is used.
5/13
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