L7900
SERIES
NEGATIVEVOLTAGE REGULATORS
November 1999
■ OUTPUT CURRENT UP TO1.5 A
■
OUTPUT VOLTAGESOF -5;-5.2; -6;-8; -9;
-12;-15; -18;-20; -22;-24V
■
THERMAL OVERLOADPROTECTION
■ SHORTCIRCUITPROTECTION
■ OUTPUT TRANSITIONSOAPROTECTION
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.Theseregulatorscan 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
voltagesand currents.
1
2
TO-3
TO-220 ISOWATT220
1
2
3
1
3
D2PAK
SCHEMATIC DIAGRAM
1/13
CONNECTION DIAGRAM AND ORDERING NUMBERS(top view)
TO-220 & ISOWATT220 TO-3D2PAK
THERMALDATA
Symbol Parameter D2PAK TO-220 ISOWATT220 TO-3 Unit
R
thj-cas e
R
thj-amb
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
Type TO-220 D
2
PAK (*) ISOWATT220 TO-3 OutputVoltage
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
L7906CP
L7908CP
L7912CP
L7915CP
L7918CP
L7920CP
L7924CP
L7905CT
L7952CT
L7906CT
L7908CT
L7912CT
L7915CT
L7918CT
L7920CT
L7922CT
L7924CT
-5V
-5.2V
-6V
-8V
-12V
-15V
-18V
-20V
-22V
-24V
(*) AVAILABLEIN TAPE AND REEL WITH ”-TR” SUFFIX
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
i
DC InputVoltage (for VO= 5to 18V)
(forV
O
= 20, 24V)
-35
-40
V
V
I
o
OutputCurrent Internally limited
P
tot
PowerDissipation Internally limited
T
op
OperatingJunctionTemperatureRange 0 to 150
o
C
T
stg
StorageTemperature Range - 65 to 150
o
C
APPLICATION CIRCUIT
L7900
2/13
* Load and line regulation are specified at constant junction temperature. Changes in Vodue to heating effects must be taken into account
separately. Pulce testingwith low duty cycle is used.
ELECTRICAL CHARACTERISTICS FOR L7905C
(refer to the test circuits, T
j
= 0 to 150oC,
V
i
= -10V, Io= 500 mA, Ci= 2.2 µF,Co=1µF unless otherwisespecified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
o
OutputVoltage Tj=25oC-4.8-5-5.2V
V
o
OutputVoltage Io=-5mAto-1A Po≤15W
V
i
= 8 to20 V
-4.75 -5 -5.25 V
∆
V
o
* LineRegulation Vi=-7to-25V Tj=25oC
V
i
=-8to-12V Tj=25oC
100
50
mV
mV
∆V
o
* LoadRegulation Io=5 to 1500 mA Tj=25oC
I
o
=250 to 750mA Tj=25oC
100
50
mV
mV
I
d
QuiescentCurrent Tj=25oC3mA
∆I
d
QuiescentCurrentChange Io=5 to 1000 mA 0.5 mA
∆I
d
QuiescentCurrentChange Vi=-8to-25V 1.3 mA
∆
V
o
∆
T
OutputVoltageDrift Io=5 mA -0.4 mV/oC
e
N
OutputNoiseVoltage B = 10Hzto 100KHz Tj=25oC100
µ
V
SVR Supply Voltage Rejection ∆V
i
=10V f= 120Hz 54 60 dB
V
d
Dropout Voltage Io=1A Tj=25oC
∆V
O
=100mV
1.4 V
I
sc
ShortCircuit Current 2.1 A
I
scp
ShortCircuit Peak Current Tj=25oC2.5A
ELECTRICAL CHARACTERISTICS FOR L7952C(refer to the test circuits, Tj= 0 to 150oC,
V
i
= -10V, Io= 500 mA, Ci= 2.2 µF,Co=1µF unless otherwisespecified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
o
OutputVoltage Tj=25oC -5. 0 -5.2 -5.4 V
V
o
OutputVoltage Io=-5mAto-1A P
o
≤
15 W
V
i
=-9to-21V
-4.95 -5.2 -5.45 V
∆V
o
* LineRegulation Vi=-8to-25V Tj=25oC
V
i
=-9to-12V Tj=25oC
105
52
mV
mV
∆
V
o
* LoadRegulation Io=5 to 1500 mA Tj=25oC
I
o
=250 to 750mA Tj=25oC
105
52
mV
mV
I
d
QuiescentCurrent Tj=25oC3mA
∆I
d
QuiescentCurrentChange Io=5 to 1000 mA 0.5 mA
∆
I
d
QuiescentCurrentChange Vi=-9to-25V 1.3 mA
∆
V
o
∆
T
OutputVoltageDrift Io=5 mA -0.5 mV/oC
e
N
OutputNoiseVoltage B = 10Hzto 100KHz Tj=25oC125µV
SVR Supply Voltage Rejection ∆V
i
=10V f= 120Hz 54 60 dB
V
d
Dropout Voltage Io=1A Tj=25oC
∆
V
O
=100mV
1.4 V
I
sc
ShortCircuit Current 2 A
I
scp
ShortCircuit Peak Current Tj=25oC2.5A
L7900
3/13
* Load and line regulation are specified at constant junction temperature. Changes in Vodue to heating effects must be taken into account
separately. Pulce testingwith low duty cycle is used.
ELECTRICAL CHARACTERISTICS FOR L7906C
(refer to the test circuits, T
j
= 0 to 150oC,
V
i
= -11V, Io= 500 mA, Ci= 2.2 µF,Co=1µF unless otherwisespecified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
o
OutputVoltage Tj=25oC -5.75 -6 -6.25 V
V
o
OutputVoltage Io=-5mAto-1A Po≤15W
V
i
= -9.5to -21.5V
-5.7 -6 -6.3 V
∆
V
o
* LineRegulation Vi= -8.5to -25V Tj=25oC
V
i
=-9to-15V Tj=25oC
120
60
mV
mV
∆V
o
* LoadRegulation Io=5 to 1500 mA Tj=25oC
I
o
=250 to 750mA Tj=25oC
120
60
mV
mV
I
d
QuiescentCurrent Tj=25oC3mA
∆I
d
QuiescentCurrentChange Io=5 to 1000 mA 0.5 mA
∆I
d
QuiescentCurrentChange Vi= -9.5to -25V 1.3 mA
∆
V
o
∆
T
OutputVoltageDrift Io=5 mA -0.6 mV/oC
e
N
OutputNoiseVoltage B = 10Hzto 100KHz Tj=25oC144
µ
V
SVR Supply Voltage Rejection ∆V
i
=10V f= 120Hz 54 60 dB
V
d
Dropout Voltage Io=1A Tj=25oC
∆V
O
=100mV
1.4 V
I
sc
ShortCircuit Current 2 A
I
scp
ShortCircuit Peak Current Tj=25oC2.5A
ELECTRICAL CHARACTERISTICS FOR L7908C(refer to the test circuits, Tj= 0 to 150oC,
V
i
= -14V, Io= 500 mA, Ci= 2.2 µF,Co=1µF unless otherwisespecified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
o
OutputVoltage Tj=25oC-7.7-8-8.3V
V
o
OutputVoltage Io=-5mAto-1A P
o
≤
15 W
V
i
= -11.5to -23 V
-7.6 -8 -8.4 V
∆V
o
* LineRegulation Vi= -10.5to -25 V Tj=25oC
V
i
= -11to -17 V Tj=25oC
160
80
mV
mV
∆
V
o
* LoadRegulation Io=5 to 1500 mA Tj=25oC
I
o
=250 to 750mA Tj=25oC
160
80
mV
mV
I
d
QuiescentCurrent Tj=25oC3mA
∆I
d
QuiescentCurrentChange Io=5 to 1000 mA 0.5 mA
∆
I
d
QuiescentCurrentChange Vi= -11.5to -25 V 1.3 mA
∆
V
o
∆
T
OutputVoltageDrift Io=5 mA -0.6 mV/oC
e
N
OutputNoiseVoltage B = 10Hzto 100KHz Tj=25oC175µV
SVR Supply Voltage Rejection ∆V
i
=10V f= 120Hz 54 60 dB
V
d
Dropout Voltage Io=1A Tj=25oC
∆
V
O
=100mV
1.1 V
I
sc
ShortCircuit Current 1.5 A
I
scp
ShortCircuit Peak Current Tj=25oC2.5A
L7900
4/13
* Load and line regulation are specified at constant junction temperature. Changes in Vodue to heating effects must be taken into account
separately. Pulce testingwith low duty cycle is used.
ELECTRICAL CHARACTERISTICS FOR L7912C
(refer to the test circuits, T
j
= 0 to 150oC,
V
i
= -19V, Io= 500 mA, Ci= 2.2 µF,Co=1µF unless otherwisespecified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
o
OutputVoltage Tj=25oC -11.5 -12 -12.5 V
V
o
OutputVoltage Io=-5mAto-1A Po≤15W
V
i
= -15.5to -27 V
-11.4 -12 -12.6 V
∆
V
o
* LineRegulation Vi= -14.5to -30 V Tj=25oC
V
i
= -16to -22 V Tj=25oC
240
120
mV
mV
∆V
o
* LoadRegulation Io=5 to 1500 mA Tj=25oC
I
o
=250 to 750mA Tj=25oC
240
120
mV
mV
I
d
QuiescentCurrent Tj=25oC3mA
∆I
d
QuiescentCurrentChange Io=5 to 1000 mA 0.5 mA
∆I
d
QuiescentCurrentChange Vi= -15to -30 V 1 mA
∆
V
o
∆
T
OutputVoltageDrift Io=5 mA -0.8 mV/oC
e
N
OutputNoiseVoltage B = 10Hzto 100KHz Tj=25oC200
µ
V
SVR Supply Voltage Rejection ∆V
i
=10V f= 120Hz 54 60 dB
V
d
Dropout Voltage Io=1A Tj=25oC
∆V
O
=100mV
1.1 V
I
sc
ShortCircuit Current 1.5 A
I
scp
ShortCircuit Peak Current Tj=25oC2.5A
ELECTRICAL CHARACTERISTICS FOR L7915C(refer to the test circuits, Tj= 0 to 150oC,
V
i
= -23V, Io= 500 mA, Ci= 2.2 µF,Co=1µF unless otherwisespecified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
o
OutputVoltage Tj=25oC -14.4 -15 -15.6 V
V
o
OutputVoltage Io=-5mAto-1A P
o
≤
15 W
V
i
= -18.5to -30 V
-14.3 -15 -15.7 V
∆V
o
* LineRegulation Vi= -17.5to -30 V Tj=25oC
V
i
= -20to -26 V Tj=25oC
300
150
mV
mV
∆
V
o
* LoadRegulation Io=5 to 1500 mA Tj=25oC
I
o
=250 to 750mA Tj=25oC
300
150
mV
mV
I
d
QuiescentCurrent Tj=25oC3mA
∆I
d
QuiescentCurrentChange Io=5 to 1000 mA 0.5 mA
∆
I
d
QuiescentCurrentChange Vi= -18.5to -30 V 1 mA
∆
V
o
∆
T
OutputVoltageDrift Io=5 mA -0.9 mV/oC
e
N
OutputNoiseVoltage B = 10Hzto 100KHz Tj=25oC250µV
SVR Supply Voltage Rejection ∆V
i
=10V f= 120Hz 54 60 dB
V
d
Dropout Voltage Io=1A Tj=25oC
∆
V
O
=100mV
1.1 V
I
sc
ShortCircuit Current 1.3 A
I
scp
ShortCircuit Peak Current Tj=25oC2.2A
L7900
5/13
* Load and line regulation are specified at constant junction temperature. Changes in Vodue to heating effects must be taken into account
separately. Pulce testingwith low duty cycle is used.
ELECTRICAL CHARACTERISTICS FOR L7918C
(refer to the test circuits, T
j
= 0 to 150oC,
V
i
= -27V, Io= 500 mA, Ci= 2.2 µF,Co=1µF unless otherwisespecified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
o
OutputVoltage Tj=25oC -17.3 -18 -18.7 V
V
o
OutputVoltage Io=-5mAto-1A Po≤15W
V
i
= -22to -33 V
-17.1 -18 -18.9 V
∆
V
o
* LineRegulation Vi= -21to -33 V Tj=25oC
V
i
= -24to -30 V Tj=25oC
360
180
mV
mV
∆V
o
* LoadRegulation Io=5 to 1500 mA Tj=25oC
I
o
=250 to 750mA Tj=25oC
360
180
mV
mV
I
d
QuiescentCurrent Tj=25oC3mA
∆I
d
QuiescentCurrentChange Io=5 to 1000 mA 0.5 mA
∆I
d
QuiescentCurrentChange Vi= -22to -33 V 1 mA
∆
V
o
∆
T
OutputVoltageDrift Io=5 mA -1 mV/oC
e
N
OutputNoiseVoltage B = 10Hzto 100KHz Tj=25oC300
µ
V
SVR Supply Voltage Rejection ∆V
i
=10V f= 120Hz 54 60 dB
V
d
Dropout Voltage Io=1A Tj=25oC
∆V
O
=100mV
1.1 V
I
sc
ShortCircuit Current 1.1 A
I
scp
ShortCircuit Peak Current Tj=25oC2.2A
ELECTRICAL CHARACTERISTICS FOR L7920C(refer to the test circuits, Tj= 0 to 150oC,
V
i
= -29V, Io= 500 mA, Ci= 2.2 µF,Co=1µF unless otherwisespecified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
o
OutputVoltage Tj=25oC -19.2 -20 -20.8 V
V
o
OutputVoltage Io=-5mAto-1A P
o
≤
15 W
V
i
= -24to -35 V
-19 -20 -21 V
∆V
o
* LineRegulation Vi= -23to -35 V Tj=25oC
V
i
= -26to -32 V Tj=25oC
400
200
mV
mV
∆
V
o
* LoadRegulation Io=5 to 1500 mA Tj=25oC
I
o
=250 to 750mA Tj=25oC
400
200
mV
mV
I
d
QuiescentCurrent Tj=25oC3mA
∆I
d
QuiescentCurrentChange Io=5 to 1000 mA 0.5 mA
∆
I
d
QuiescentCurrentChange Vi= -24to -35 V 1 mA
∆
V
o
∆
T
OutputVoltageDrift Io=5 mA -1.1 mV/oC
e
N
OutputNoiseVoltage B = 10Hzto 100KHz Tj=25oC350µV
SVR Supply Voltage Rejection ∆V
i
=10V f= 120Hz 54 60 dB
V
d
Dropout Voltage Io=1A Tj=25oC
∆
V
O
=100mV
1.1 V
I
sc
ShortCircuit Current 0.9 A
I
scp
ShortCircuit Peak Current Tj=25oC2.5A
L7900
6/13
* Load and line regulation are specified at constant junction temperature. Changes in Vodue to heating effects must be taken into account
separately. Pulce testingwith low duty cycle is used.
ELECTRICAL CHARACTERISTICS FOR L7922C
(refer to the test circuits, T
j
= 0 to 150oC,
V
i
= -31V, Io= 500 mA, Ci= 2.2 µF,Co=1µF unless otherwisespecified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
o
OutputVoltage Tj=25oC -21.1 -22 -22.9 V
V
o
OutputVoltage Io=-5mAto-1A Po≤15W
V
i
= -26to -37 V
-20.9 -22 -23.1 V
∆
V
o
* LineRegulation Vi= -25to -37 V Tj=25oC
V
i
= -28to -34 V Tj=25oC
440
220
mV
mV
∆V
o
* LoadRegulation Io=5 to 1500 mA Tj=25oC
I
o
=250 to 750mA Tj=25oC
440
220
mV
mV
I
d
QuiescentCurrent Tj=25oC3mA
∆I
d
QuiescentCurrentChange Io=5 to 1000 mA 0.5 mA
∆I
d
QuiescentCurrentChange Vi= -26to -37 V 1 mA
∆
V
o
∆
T
OutputVoltageDrift Io=5 mA -1.1 mV/oC
e
N
OutputNoiseVoltage B = 10Hzto 100KHz Tj=25oC375
µ
V
SVR Supply Voltage Rejection ∆V
i
=10V f= 120Hz 54 60 dB
V
d
Dropout Voltage Io=1A Tj=25oC
∆V
O
=100mV
1.1 V
I
sc
ShortCircuit Current 1.1 A
I
scp
ShortCircuit Peak Current Tj=25oC2.2A
ELECTRICAL CHARACTERISTICS FOR L7924C(refer to the test circuits, Tj= 0 to 150oC,
V
i
= -33V, Io= 500 mA, Ci= 2.2 µF,Co=1µF unless otherwisespecified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
o
OutputVoltage Tj=25oC -23 -24 -25 V
V
o
OutputVoltage Io=-5mAto-1A P
o
≤
15 W
V
i
= -27to -38 V
-22.8 -24 -25.2 V
∆V
o
* LineRegulation Vi= -27to -38 V Tj=25oC
V
i
= -30to -36 V Tj=25oC
480
240
mV
mV
∆
V
o
* LoadRegulation Io=5 to 1500 mA Tj=25oC
I
o
=250 to 750mA Tj=25oC
480
240
mV
mV
I
d
QuiescentCurrent Tj=25oC3mA
∆I
d
QuiescentCurrentChange Io=5 to 1000 mA 0.5 mA
∆
I
d
QuiescentCurrentChange Vi= -27to -38 V 1 mA
∆
V
o
∆
T
OutputVoltageDrift Io=5 mA -1 mV/oC
e
N
OutputNoiseVoltage B = 10Hzto 100KHz Tj=25oC400µV
SVR Supply Voltage Rejection ∆V
i
=10V f= 120Hz 54 60 dB
V
d
Dropout Voltage Io=1A Tj=25oC
∆
V
O
=100mV
1.1 V
I
sc
ShortCircuit Current 1.1 A
I
scp
ShortCircuit Peak Current Tj=25oC2.2A
L7900
7/13
Figure1 : Fixed Output Regulator. Figure2 : SplitPowerSupply (± 15V/1A).
Notes :
1. To specify an output voltage, substitute voltage value for ”XX”.
2. Required for stability. For value given, capacitor must be solid
tantalum. If aluminium electrolitics are used, at least ten times
value should be selected. C
1
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.
Against potentiallatch-up problems.
APPLICATION INFORMATION
Figure 3 : Circuitfor IncreasingOutput Voltage. Figure 4 : High CurrentNegative Regulator
(– 5V/4A with 5A current limiting).
C3 Optional for improved transient response and ripple rejection.
Figure5 : Typical ECL SystemPowerSupply
(– 5.2V/4A).
Optional dropping resistor to reduce the power dissipated in the
boost transistor.
V
O
=
V
XX
R
1
+
R
2
R
2
V
XX
R
2
> 3
I
d
L7900
8/13
DIM.
mm inch
MIN. TYP. MAX. MIN. TYP. MAX.
A 11.7 0.460
B 0.96 1.10 0.037 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 39.50 1.555
V 30.10 1.185
E
B
R
C
DA
P
G
N
V
U
O
P003N
TO-3 (R) MECHANICALDATA
L7900
9/13
DIM.
mm inch
MIN. TYP. MAX. MIN. TYP. MAX.
A 4.8 0.189
C 1.37 0.054
D 2.4 2.8 0.094 0.110
D1 1.2 1.35 0.047 0.053
E 0.35 0.55 0.014 0.022
F 0.61 0.94 0.024 0.037
F2 1.15 1.4 0.045 0.055
G 4.95 5.08 5.21 0.195 0.200 0.205
H2 10.4 0.409
H3 10.05 10.4 0.396 0.409
L2 16.2 0.638
L3 26.3 26.7 27.1 1.035 1.051 1.067
L5 2.6 3 0.102 0.118
L6 15.1 15.8 0.594 0.622
L7 6 6.6 0.236 0.260
Dia. 3.65 3.85 0.144 0.152
P011D
TO-220 MECHANICAL DATA
L7900
10/13
DIM.
mm inch
MIN. TYP. MAX. MIN. TYP. MAX.
A 4.4 4.6 0.173 0.181
B 2.5 2.7 0.098 0.106
D 2.5 2.75 0.098 0.108
E 0.4 0.7 0.015 0.027
F 0.75 1 0.030 0.039
F1 1.15 1.7 0.045 0.067
F2 1.15 1.7 0.045 0.067
G 4.95 5.2 0.195 0.204
G1 2.4 2.7 0.094 0.106
H 10 10.4 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
Ø 3 3.2 0.118 0.126
L2
A
B
D
E
H
G
L6
¯
F
L3
G1
123
F2
F1
L7
L4
ISOWATT220MECHANICAL DATA
P011G
L7900
11/13
DIM.
mm inch
MIN. TYP. MAX. MIN. TYP. MAX.
A 4.4 4.6 0.173 0.181
A1 2.49 2.69 0.098 0.106
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
E 10 10.4 0.393 0.409
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
L2
L3
L
B2
B
G
E
A
C2
D
C
A1
DETAIL”A”
DETAIL”A”
A2
P011P6/F
TO-263 (D2PAK) MECHANICALDATA
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