Page 1
NEGATIVE VOLTAGE REGULATORS
■ OUTPUT CURRENT UP TO 1.5A
■ OUTPUT VOLTAGES OF -5; -5.2; -6; -8; -9;
-12; -15; -18; -20 ; -22; -24V
■ THERMAL OVERLOAD PROTECTION
■ SHORT CIRCUIT PROTECTION
■ OUTPUT TRANSITION SOA PROTECTION
L7900
SERIES
DESCRIPTION
The L7900 series of three-terminal negative
regulators is available in TO-220, TO-220FP,
TO-3 and D
output voltages, making it useful in a wide range of
applications. These regulators c an provide local
on-card regulation, eliminating t he distribution
problems associated with sin gle 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, thes e devices can be used with
external components to obtain adjust able voltages
and currents.
SCHEMATIC DIAGRAM
2
PAK packages and several fixed
TO-220
D2PAK
TO-220FP
TO-3
1/16February 2003
Page 2
L7900 SERIE S
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter² Value Unit
V
I
P
T
T
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is
not implied.
DC Input Voltage for VO= 5 to 18V
I
Output Current
O
Power Dissipation
tot
Storage Temperature Range
stg
Operating Junction Temperature Range
op
for V
= 20, 24V
O
THERMAL DATA
-35
-40
Internally Limited
Internally Limited
-65 to 150 °C
0 to 150 °C
V
Symbol Parameter
R
thj-case
R
thj-amb
Thermal Resistance Junction-case Max
Thermal Resistance Junction-ambient Max
CONNECTION DIAGRAM (top view)
TO-220 TO-220FP
2
PAK
2
PAK
D
TO-220 TO-220FP TO-3 Unit
3354°C/W
62.5 50 60 35 °C/W
TO-3D
2/16
Page 3
ORDERING CODES
L7900 SERIE S
TYPE TO-220
2
D
PAK (*)
TO-220FP TO-3 OUTPUT VOLTAGE
L7905C L7905CV L7905ACD2T L7905CP L7905CT -5 V
L7952C L7952CV L7952ACD2T L7952CT -5.2 V
L7906C L7906CV L7906ACD2T L7906CP L7906CT -6 V
L7908C L7908CV L7908ACD2T L7908CP L7908CT -8 V
L7912C L7912CV L7912ACD2T L7912CP L7912CT -12 V
L7915C L7915CV L7915ACD2T L7915CP L7915CT -15 V
L7918C L7918CV L7918ACD2T L7918CP L7918CT -18 V
L7920C L7920CV L7920ACD2T L7920CP L7920CT -20 V
L7922C L7922CV L7922ACD2T L7922CT -22 V
L7924C L7924CV L7924ACD2T L7924CP L7924CT -24 V
(*) Available in Tape & Reel with the suffix "-TR".
TEST CIRCUIT
ELECTRICAL CHARACTERISTICS O F L7905C (refer to the test circuits, T
I
=500mA,CI=2.2µF,CO= 1 µF unless otherwise specified).
O
= 0 t o 125°C, VI= -10V,
J
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
Output Voltage TJ= 25°C -4.8 -5 -5.2 V
O
Output Voltage IO=-5mAto-1A PO≤15 W
V
O
(*) Line Regulation VI=-7to-25V TJ= 25°C 100 mV
∆V
O
(*) Load Regulation IO=5mAto1.5A TJ= 25°C 100 mV
∆V
O
Quiescent Current TJ= 25°C 3 mA
I
d
Quiescent Current Change IO=5mAto1A 0.5 mA
∆I
d
/∆T Output Voltage Drift IO= 5 mA -0.4 mV/°C
∆V
O
eN Output Noise Voltage B = 10Hz to 100KHz T
SVR Supply Voltage Rejection ∆V
Dropout Voltage IO=1A TJ= 25°C ∆VO= 100 mV 1.4 V
V
d
Short Circuit Current 2.1 A
I
sc
(*) Load and line regulation are specified at constant junction temperature. Changes in VOdue to heating effects must be taken into account
separately. Pulse testingwith low duty cycle is used.
V
= 8 to 20 V
I
V
=-8to-12V TJ= 25°C 50
I
= 250 to 750 mA TJ= 25°C 50
I
O
= -8 to -25 V 1.3
V
I
= 25°C 100 µV
J
= 10 V f = 120Hz 54 60 dB
I
-4.75 -5 -5.25 V
3/16
Page 4
L7900 SERIE S
ELECTRICAL CHARACTERISTICS O F L7952C (refer to the test circuits, TJ= 0 t o 125°C, VI= -10V,
I
=500mA,CI=2.2µF,CO= 1 µF unless otherwise specified).
O
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
Output Voltage TJ= 25°C -5.0 -5.2 -5.4 V
O
Output Voltage IO=-5mAto-1A PO≤15 W
V
O
(*) Line Regulation VI=-8to-25V TJ= 25°C 105 mV
∆V
O
(*) Load Regulation IO=5mAto1.5A TJ= 25°C 105 mV
∆V
O
Quiescent Current TJ= 25°C 3 mA
I
d
Quiescent Current Change IO=5mAto1A 0.5 mA
∆I
d
/∆T Output Voltage Drift IO= 5 mA -0.5 mV/°C
∆V
O
eN Output Noise Voltage B = 10Hz to 100KHz T
SVR Supply Voltage Rejection ∆V
Dropout Voltage IO=1A TJ= 25°C ∆VO= 100 mV 1.4 V
V
d
Short Circuit Current 2 A
I
sc
(*) Load and line regulation are specified at constant junction temperature. Changes in VOdue to heating effects must be taken into account
separately. Pulse testingwith low duty cycle is used.
V
= -9 to -21 V
I
=-9to-12V TJ= 25°C 52
V
I
= 250 to 750 mA TJ= 25°C 52
I
O
= -9 to -25 V 1.3
V
I
= 25°C 125 µV
J
= 10 V f = 120Hz 54 60 dB
I
-4.95 -5.2 -5.45 V
ELECTRICAL CHARACTERISTICS O F L7906C (refer to the test circuits, TJ= 0 t o 125°C, VI= -11V,
=500mA,CI=2.2µF,CO= 1 µF unless otherwise specified).
I
O
Symbol Parameter Test Conditions Min. Typ. Max. Unit
Output Voltage TJ= 25°C -5.75 -6 -6.25 V
V
O
Output Voltage IO=-5mAto-1A PO≤15 W
V
O
(*) Line Regulation VI= -8.5 to -25 V TJ= 25°C 120 mV
∆V
O
(*) Load Regulation IO=5mAto1.5A TJ= 25°C 120 mV
∆V
O
Quiescent Current TJ= 25°C 3 mA
I
d
Quiescent Current Change IO=5mAto1A 0.5 mA
∆I
d
/∆T Output Voltage Drift IO= 5 mA -0.6 mV/°C
∆V
O
eN Output Noise Voltage B = 10Hz to 100KHz T
SVR Supply Voltage Rejection ∆V
Dropout Voltage IO=1A TJ= 25°C ∆VO= 100 mV 1.4 V
V
d
I
Short Circuit Current 2 A
sc
(*) Load and line regulation are specified at constant junction temperature. Changes in VOdue to heating effects must be taken into account
separately. Pulse testingwith low duty cycle is used.
V
= -9.5 to -21.5 V
I
=-9to-15V TJ= 25°C 60
V
I
= 250 to 750 mA TJ= 25°C 60
I
O
= -9.5 to -25 V 1.3
V
I
= 25°C 144 µV
J
= 10 V f = 120Hz 54 60 dB
I
-5.7 -6 -6.3 V
4/16
Page 5
L7900 SERIE S
ELECTRICAL CHARACTERISTICS O F L7908C (refer to the test circuits, TJ= 0 t o 125°C, VI= -14V,
I
=500mA,CI=2.2µF,CO= 1 µF unless otherwise specified).
O
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
Output Voltage TJ= 25°C -7.7 -8 -8.3 V
O
Output Voltage IO=-5mAto-1A PO≤15 W
V
O
(*) Line Regulation VI= -10.5 to -25 V TJ= 25°C 160 mV
∆V
O
(*) Load Regulation IO=5mAto1.5A TJ= 25°C 160 mV
∆V
O
Quiescent Current TJ= 25°C 3 mA
I
d
Quiescent Current Change IO=5mAto1A 0.5 mA
∆I
d
/∆T Output Voltage Drift IO= 5 mA -0.6 mV/°C
∆V
O
eN Output Noise Voltage B = 10Hz to 100KHz T
SVR Supply Voltage Rejection ∆V
Dropout Voltage IO=1A TJ= 25°C ∆VO= 100 mV 1.1 V
V
d
Short Circuit Current 1.5 A
I
sc
(*) Load and line regulation are specified at constant junction temperature. Changes in VOdue to heating effects must be taken into account
separately. Pulse testingwith low duty cycle is used.
V
= -11.5 to -23V
I
= -11 to -17 V TJ= 25°C 80
V
I
= 250 to 750 mA TJ= 25°C 80
I
O
= -11.5 to -25V 1
V
I
= 25°C 175 µV
J
= 10 V f = 120Hz 54 60 dB
I
-7.6 -8 -8.4 V
ELECTRICAL CHARACTERISTICS O F L7912C (refer to the test circuits, TJ= 0 t o 125°C, VI= -19V,
=500mA,CI=2.2µF,CO= 1 µF unless otherwise specified).
I
O
Symbol Parameter Test Conditions Min. Typ. Max. Unit
Output Voltage TJ= 25°C -11.5 -12 -12.5 V
V
O
Output Voltage IO=-5mAto-1A PO≤15 W
V
O
(*) Line Regulation VI= -14.5 to -30 V TJ= 25°C 240 mV
∆V
O
(*) Load Regulation IO=5mAto1.5A TJ= 25°C 240 mV
∆V
O
Quiescent Current TJ= 25°C 3 mA
I
d
Quiescent Current Change IO=5mAto1A 0.5 mA
∆I
d
/∆T Output Voltage Drift IO= 5 mA -0.8 mV/°C
∆V
O
eN Output Noise Voltage B = 10Hz to 100KHz T
SVR Supply Voltage Rejection ∆V
Dropout Voltage IO=1A TJ= 25°C ∆VO= 100 mV 1.1 V
V
d
I
Short Circuit Current 1.5 A
sc
(*) Load and line regulation are specified at constant junction temperature. Changes in VOdue to heating effects must be taken into account
separately. Pulse testingwith low duty cycle is used.
V
= -15.5 to -27 V
I
= -16 to -22 V TJ= 25°C 120
V
I
= 250 to 750 mA TJ= 25°C 120
I
O
= -15 to -30 V 1
V
I
= 25°C 200 µV
J
= 10 V f = 120Hz 54 60 dB
I
-11.4 -12 -12.6 V
5/16
Page 6
L7900 SERIE S
ELECTRICAL CHARACTERISTICS O F L7915C (refer to the test circuits, TJ= 0 t o 125°C, VI= -23V,
I
=500mA,CI=2.2µF,CO= 1 µF unless otherwise specified).
O
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
Output Voltage TJ= 25°C -14.4 -15 -15.6 V
O
Output Voltage IO=-5mAto-1A PO≤15 W
V
O
(*) Line Regulation VI= -17.5 to -30 V TJ= 25°C 300 mV
∆V
O
(*) Load Regulation IO=5mAto1.5A TJ= 25°C 300 mV
∆V
O
Quiescent Current TJ= 25°C 3 mA
I
d
Quiescent Current Change IO=5mAto1A 0.5 mA
∆I
d
/∆T Output Voltage Drift IO= 5 mA -0.9 mV/°C
∆V
O
eN Output Noise Voltage B = 10Hz to 100KHz T
SVR Supply Voltage Rejection ∆V
Dropout Voltage IO=1A TJ= 25°C ∆VO= 100 mV 1.1 V
V
d
Short Circuit Current 1.3 A
I
sc
(*) Load and line regulation are specified at constant junction temperature. Changes in VOdue to heating effects must be taken into account
separately. Pulse testingwith low duty cycle is used.
V
= -18.5 to -30 V
I
= -20 to -26 V TJ= 25°C 150
V
I
= 250 to 750 mA TJ= 25°C 150
I
O
= -18.5 to -30 V 1
V
I
= 25°C 250 µV
J
= 10 V f = 120Hz 54 60 dB
I
-14.3 -15 -15.7 V
ELECTRICAL CHARACTERISTICS O F L7918C (refer to the test circuits, TJ= 0 t o 125°C, VI= -27V,
=500mA,CI=2.2µF,CO= 1 µF unless otherwise specified).
I
O
Symbol Parameter Test Conditions Min. Typ. Max. Unit
Output Voltage TJ= 25°C -17.3 -18 -18.7 V
V
O
Output Voltage IO=-5mAto-1A PO≤15 W
V
O
(*) Line Regulation VI= -21 to -33 V TJ= 25°C 360 mV
∆V
O
(*) Load Regulation IO=5mAto1.5A TJ= 25°C 360 mV
∆V
O
Quiescent Current TJ= 25°C 3 mA
I
d
Quiescent Current Change IO=5mAto1A 0.5 mA
∆I
d
/∆T Output Voltage Drift IO= 5 mA -1 mV/°C
∆V
O
eN Output Noise Voltage B = 10Hz to 100KHz T
SVR Supply Voltage Rejection ∆V
Dropout Voltage IO=1A TJ= 25°C ∆VO= 100 mV 1.1 V
V
d
I
Short Circuit Current 1.1 A
sc
(*) Load and line regulation are specified at constant junction temperature. Changes in VOdue to heating effects must be taken into account
separately. Pulse testingwith low duty cycle is used.
V
= -22 to -33 V
I
= -24 to -30 V TJ= 25°C 180
V
I
= 250 to 750 mA TJ= 25°C 180
I
O
= -22 to -33 V 1
V
I
= 25°C 300 µV
J
= 10 V f = 120Hz 54 60 dB
I
-17.1 -18 -18.9 V
6/16
Page 7
L7900 SERIE S
ELECTRICAL CHARACTERISTICS O F L7920C (refer to the test circuits, TJ= 0 t o 125°C, VI= -29V,
I
=500mA,CI=2.2µF,CO= 1 µF unless otherwise specified).
O
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
Output Voltage TJ= 25°C -19.2 -20 -20.8 V
O
Output Voltage IO=-5mAto-1A PO≤15 W
V
O
(*) Line Regulation VI= -23 to -35 V TJ= 25°C 400 mV
∆V
O
(*) Load Regulation IO=5mAto1.5A TJ= 25°C 400 mV
∆V
O
Quiescent Current TJ= 25°C 3 mA
I
d
Quiescent Current Change IO=5mAto1A 0.5 mA
∆I
d
/∆T Output Voltage Drift IO= 5 mA -1.1 mV/°C
∆V
O
eN Output Noise Voltage B = 10Hz to 100KHz T
SVR Supply Voltage Rejection ∆V
Dropout Voltage IO=1A TJ= 25°C ∆VO= 100 mV 1.1 V
V
d
Short Circuit Current 0.9 A
I
sc
(*) Load and line regulation are specified at constant junction temperature. Changes in VOdue to heating effects must be taken into account
separately. Pulse testingwith low duty cycle is used.
V
= -24 to -35 V
I
= -26 to -32 V TJ= 25°C 200
V
I
= 250 to 750 mA TJ= 25°C 200
I
O
= -24 to -35 V 1
V
I
= 25°C 350 µV
J
= 10 V f = 120Hz 54 60 dB
I
-19 -20 -21 V
ELECTRICAL CHARACTERISTICS O F L7922C (refer to the test circuits, TJ= 0 t o 125°C, VI= -31V,
=500mA,CI=2.2µF,CO= 1 µF unless otherwise specified).
I
O
Symbol Parameter Test Conditions Min. Typ. Max. Unit
Output Voltage TJ= 25°C -21.1 -22 -22.9 V
V
O
Output Voltage IO=-5mAto-1A PO≤15 W
V
O
(*) Line Regulation VI= -25 to -37 V TJ= 25°C 440 mV
∆V
O
(*) Load Regulation IO=5mAto1.5A TJ= 25°C 440 mV
∆V
O
Quiescent Current TJ= 25°C 3 mA
I
d
Quiescent Current Change IO=5mAto1A 0.5 mA
∆I
d
/∆T Output Voltage Drift IO= 5 mA -1.1 mV/°C
∆V
O
eN Output Noise Voltage B = 10Hz to 100KHz T
SVR Supply Voltage Rejection ∆V
Dropout Voltage IO=1A TJ= 25°C ∆VO= 100 mV 1.1 V
V
d
I
Short Circuit Current 1.1 A
sc
(*) Load and line regulation are specified at constant junction temperature. Changes in VOdue to heating effects must be taken into account
separately. Pulse testingwith low duty cycle is used.
V
= -26 to -37 V
I
= -28 to -34 V TJ= 25°C 220
V
I
= 250 to 750 mA TJ= 25°C 220
I
O
= -26 to -37 V 1
V
I
= 25°C 375 µV
J
= 10 V f = 120Hz 54 60 dB
I
-20.9 -22 -23.1 V
7/16
Page 8
L7900 SERIE S
ELECTRICAL CHARACTERISTICS O F L7924C (refer to the test circuits, TJ= 0 t o 125°C, VI= -33V,
I
=500mA,CI=2.2µF,CO= 1 µF unless otherwise specified).
O
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
Output Voltage TJ= 25°C -23 -24 -24.5 V
O
Output Voltage IO=-5mAto-1A PO≤15 W
V
O
(*) Line Regulation VI= -27 to -38 V TJ= 25°C 480 mV
∆V
O
(*) Load Regulation IO=5mAto1.5A TJ= 25°C 480 mV
∆V
O
Quiescent Current TJ= 25°C 3 mA
I
d
Quiescent Current Change IO=5mAto1A 0.5 mA
∆I
d
/∆T Output Voltage Drift IO= 5 mA -1 mV/°C
∆V
O
eN Output Noise Voltage B = 10Hz to 100KHz T
SVR Supply Voltage Rejection ∆V
Dropout Voltage IO=1A TJ= 25°C ∆VO= 100 mV 1.1 V
V
d
Short Circuit Current 1.1 A
I
sc
(*) Load and line regulation are specified at constant junction temperature. Changes in VOdue to heating effects must be taken into account
separately. Pulse testingwith low duty cycle is used.
V
= -27 to -38 V
I
= -30 to -36 V TJ= 25°C 240
V
I
= 250 to 750 mA TJ= 25°C 240
I
O
= -27 to -38 V 1
V
I
= 25°C 400 µV
J
= 10 V f = 120Hz 54 60 dB
I
-22.8 -24 -25.2 V
APPLICATIONS INFORMATION
Figure1 : Fixed Output Regulator
NOTE:
1. To specify an output voltage, substitute voltage value for "XX".
2. Required forstability. For value given,capacitor must be solidtantalum. Ifaluminium electrolytics are used,at least ten times value should
be selected. C1 is required if regulator is located an appreciable distance from power supply filter.
3. To improve transient response. If large capacitors are used, a high current diode from input to output (1N4001 or similar) should be introduced to protect the device from momentary input short circuit.
8/16
Page 9
Figure2 : Split Power Su pply (± 15V/1A)
Against potential latch-up problems.
Figure3 : Ci rcu it for Increasing Output Voltage
L7900 SERIE S
R1+R
VO=Vxx
C3 Optional for improved transient response and ripple rejection.
2
R
2
V
xx
> 3I
R
2
d
Figure4 : Hi gh Current Negative Regulator (-5V/4A with 5A current limiting)
9/16
Page 10
L7900 SERIE S
Figure5 : T y pical ECL System Power Supply (-5.2V/4A)
Optional dropping resistor to reduce the power dissipated in the boost transistor.
10/16
Page 11
TO-3 MECHANICAL DATA
L7900 SERIE S
DIM.
A 11.85 0.466
B 0.96 1.05 1.10 0.037 0.041 0.043
C 1.70 0.066
D 8.7 0.342
E 20.0 0.787
G 10.9 0.429
N 16.9 0.665
P 26.2 1.031
R 3.88 4.09 0.152 0.161
U 39.5 1.555
V 30.10 1.185
MIN. TYP MAX. MIN. TYP. MAX.
mm. inch
P
A
G
U
V
N
O
B
D
C
E
R
P003C/C
11/16
Page 12
L7900 SERIE S
TO-220 MECHANICAL DAT
DIM.
A 4.40 4.60 0.173 0.181
C 1.23 1.32 0.048 0.051
D 2.40 2.72 0.094 0.107
D1 1.27 0.050
E 0.49 0.70 0.019 0.027
F 0.61 0.88 0.024 0.034
F1 1.14 1.70 0.044 0.067
F2 1.14 1.70 0.044 0.067
G 4.95 5.15 0.194 0.203
G1 2.4 2.7 0.094 0.106
H2 10.0 10.40 0.393 0.409
L2 16.4 0.645
L4 13.0 14.0 0.511 0.551
L5 2.65 2.95 0.104 0.116
L6 15.25 15.75 0.600 0.620
L7 6.2 6.6 0.244 0.260
L9 3.5 3.93 0.137 0.154
DIA. 3.75 3.85 0.147 0.151
MIN. TYP MAX. MIN. TYP. MAX.
mm. inch
A
12/16
P011C
Page 13
TO-220FP MECHANICAL DATA
L7900 SERIE S
DIM.
A 4.40 4.60 0.173 0.181
B 2.5 2.7 0.098 0.106
D 2.5 2.75 0.098 0.108
E 0.45 0.70 0.017 0.027
F 0.75 1 0.030 0.039
F1 1.15 1.50 0.045 0.059
F2 1.15 1.50 0.045 0.059
G 4.95 5.2 0.194 0.204
G1 2.4 2.7 0.094 0.106
H 10.0 10.40 0.393 0.409
L2 16 0.630
L3 28.6 30.6 1.126 1.204
L4 9.8 10.6 0.385 0.417
L6 15.9 16.4 0.626 0.645
L7 9 9.3 0.354 0.366
DIA. 3 3.2 0.118 0.126
MIN. TYP MAX. MIN. TYP. MAX.
mm. inch
A
B
H
E
D
L3
L6
L7
¯
F1
F
G1
G
F2
123
L2
L4
7012510/F
13/16
Page 14
L7900 SERIE S
D2PAK MEC
mm. inch
DIM.
MIN. TYP MAX. MIN. TYP. MAX.
A 4.4 4.6 0.173 0.181
A1 2.49 2.69 0.098 0.106
A2 0.03 0.23 0.001 0.009
B 0.7 0.93 0.027 0.036
B2 1.14 1.7 0.044 0.067
C 0.45 0.6 0.017 0.023
C2 1.23 1.36 0.048 0.053
D 8.95 9.35 0.352 0.368
D1 8 0.315
E 10 10.4 0.393 0.409
E1 8.5 0.335
G 4.88 5.28 0.192 0.208
L 15 15.85 0.590 0.624
L2 1.27 1.4 0.050 0.055
L3 1.4 1.75 0.055 0.068
M 2.4 3.2 0.094 0.126
R 0.4 0.016
V2 0˚ 8˚ 0˚ 8˚
HANICAL DATA
14/16
P011P6G
Page 15
L7900 SERIE S
Tape & Reel D
DIM.
A 180 7.086
C 12.8 13.0 13.2 0.504 0.512 0.519
D 20.2 0.795
N 60 2.362
T 14.4 0.567
Ao 10.50 10.6 10.70 0.413 0.417 0.421
Bo 15.70 15.80 15.90 0.618 0.622 0.626
Ko 4.80 4.90 5.00 0.189 0.193 0.197
Po 3.9 4.0 4.1 0.153 0.157 0.161
P 11.9 12.0 12.1 0.468 0.472 0.476
2
PAK-P2PAK-D2PAK/A-P2PAK/A MECHANICAL DATA
mm. inch
MIN. TYP MAX. MIN. TYP. MAX.
15/16
Page 16
L7900 SERIE S
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