L7900
SERIES
NEG A TIVE VOL TAGE REG U L A TORS
■ OUTPUT CURRENT UP TO 1.5A
■ OUTPUT VOLTAGES OF -5; -6; -8; -12; -15;
-18; -20; -24V
■ THERMAL OVERLOAD PROTECTION
■ SHORT CIRCUIT PROTECTION
■ OUTPUT TRANSITION SOA PROTECTION
DESCRIPTION
The L7900 series of three-terminal negative
regulators is available in TO-220, TO-220FP,
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. 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.
TO-220
D2PAK
TO-220FP
TO-3
Figure 1: Sche matic Diagram
Rev. 10
1/18August 2005
L7900 SERIES
Table 1: Absolute Maximum Ratings
Symbol Parameter 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
Table 2: 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
Figure 2: Connection Diagram (top view)
TO-220 TO-220FP
2
PAK
D2PAK
TO-220 TO-220FP TO-3 Unit
3354°C/W
62.5506035°C/W
TO-3D
2/18
L7900 SERIES
Table 3: Order Codes
2
PAK
TYPE
TO-220
(A Type)
TO-220
(C Type)
TO-220
(E Type)
2
PAK
D
(A Type) (#)
L7905C L7905CV L7905C-V L7905CV1 L7905CD2T L7905C-D2TR L7905CP L7905CT (*) -5 V
L7906C L7906CV L7906CD2T L7906CP (*) L7906CT (*) -6 V
L7908C L7908CV L7908CD2T L7908CP (*) L7908CT (*) -8 V
L7912C L7912CV L7912C-V L7912CV1 L7912CD2T L7912CP L7912CT (*) -12 V
L7915C L7915CV L7915CD2T L7915CP L7915CT -15 V
L7918C L7918CV L7918CD2T(*) L7918CP (*) L7918CT (*) -18 V
L7920C L7920CV L7920CD2T(*) L7920CP (*) L7920CT (*) -20 V
L7924C L7924CV L7924CD2T(*) L7924CP (*) L7924CT -24 V
(#) Available in Tape & Reel with the suffix "-TR".
(*) Avai l abl e on Requ est .
Figure 3: Test Circuit
D
(C Type)
(T & R)
TO-220FP TO-3
OUTPUT
VOLTAGE
Table 4: Electrical Characteristics Of L7905C (refer to the test circuits, T
= 500 mA, CI = 2.2 µF, CO = 1 µF unless otherwise specified).
I
O
= 0 to 125°C, VI = -10V,
J
Symbol Parameter Test Conditions Min. Typ. Max. Unit
Output Voltage TJ = 25°C -4.8 -5 -5.2 V
V
O
Output Voltage IO = -5 mA to -1 A PO ≤ 15 W
V
O
(*) Line Regulation VI = -7 to -25 V TJ = 25°C 100 mV
∆V
O
(*) Load Regulation IO = 5 mA to 1.5 A TJ = 25°C 100 mV
∆V
O
I
Quiescent Current TJ = 25°C 3 mA
d
Quiescent Current Change IO = 5 mA to 1 A 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 = 1 A TJ = 25°C ∆VO = 100
V
d
V
= 8 to 20 V
I
V
= -8 to -12 V 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
1.4 V
mV
Short Circuit Current 2.1 A
I
sc
(*) Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account
separately. Pulse testing with low duty cycle is used.
3/18
L7900 SERIES
Table 5: Electrical Characteristics Of L7906C (refer to the test circuits, TJ = 0 to 125°C, VI = -11V,
= 500 mA, CI = 2.2 µF, CO = 1 µF unless otherwise specified).
I
O
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
Output Voltage TJ = 25°C -5.75 -6 -6.25 V
O
V
Output Voltage IO = -5 mA to -1 A PO ≤ 15 W
O
(*) Line Regulation VI = -8.5 to -25 V TJ = 25°C 120 mV
∆V
O
(*) Load Regulation IO = 5 mA to 1.5 A TJ = 25°C 120 mV
∆V
O
Quiescent Current TJ = 25°C 3 mA
I
d
Quiescent Current Change IO = 5 mA to 1 A 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 = 1 A TJ = 25°C ∆VO = 100
V
d
V
= -9.5 to -21.5 V
I
= -9 to -15 V TJ = 25°C 60
V
I
I
= 250 to 750 mA TJ = 25°C 60
O
= -9.5 to -25 V 1.3
V
I
= 25°C 144 µV
J
= 10 V f = 120Hz 54 60 dB
I
mV
Short Circuit Current 2 A
I
sc
(*) Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account
separately. Pulse testing with low duty cycle is used.
-5.7 -6 -6.3 V
1.4 V
Table 6: Electrical Characteristics Of L7908C (refer to the test circuits, TJ = 0 to 125°C, VI = -14V,
= 500 mA, CI = 2.2 µF, CO = 1 µF unless otherwise specified).
I
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 = -5 mA to -1 A PO ≤ 15 W
V
O
(*) Line Regulation VI = -10.5 to -25 V TJ = 25°C 160 mV
∆V
O
(*) Load Regulation IO = 5 mA to 1.5 A TJ = 25°C 160 mV
∆V
O
Quiescent Current TJ = 25°C 3 mA
I
d
Quiescent Current Change IO = 5 mA to 1 A 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 = 1 A TJ = 25°C ∆VO = 100
V
d
V
= -11.5 to -23 V
I
= -11 to -17 V TJ = 25°C 80
V
I
I
= 250 to 750 mA TJ = 25°C 80
O
= -11.5 to -25 V 1
V
I
= 25°C 175 µV
J
= 10 V f = 120Hz 54 60 dB
I
mV
Short Circuit Current 1.5 A
I
sc
(*) Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account
separately. Pulse testing with low duty cycle is used.
-7.6 -8 -8.4 V
1.1 V
4/18
L7900 SERIES
Table 7: Electrical Characteristics Of L7912C (refer to the test circuits, TJ = 0 to 125°C, VI = -19V,
= 500 mA, CI = 2.2 µF, CO = 1 µF unless otherwise specified).
I
O
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
Output Voltage TJ = 25°C -11.5 -12 -12.5 V
O
V
Output Voltage IO = -5 mA to -1 A PO ≤ 15 W
O
(*) Line Regulation VI = -14.5 to -30 V TJ = 25°C 240 mV
∆V
O
(*) Load Regulation IO = 5 mA to 1.5 A TJ = 25°C 240 mV
∆V
O
Quiescent Current TJ = 25°C 3 mA
I
d
Quiescent Current Change IO = 5 mA to 1 A 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 = 1 A TJ = 25°C ∆VO = 100
V
d
V
= -15.5 to -27 V
I
= -16 to -22 V TJ = 25°C 120
V
I
I
= 250 to 750 mA TJ = 25°C 120
O
= -15 to -30 V 1
V
I
= 25°C 200 µV
J
= 10 V f = 120Hz 54 60 dB
I
mV
Short Circuit Current 1.5 A
I
sc
(*) Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account
separately. Pulse testing with low duty cycle is used.
-11.4 -12 -12.6 V
1.1 V
Table 8: Electrical Characteristics Of L7915C (refer to the test circuits, TJ = 0 to 125°C, VI = -23V,
= 500 mA, CI = 2.2 µF, CO = 1 µF unless otherwise specified).
I
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 = -5 mA to -1 A PO ≤ 15 W
V
O
(*) Line Regulation VI = -17.5 to -30 V TJ = 25°C 300 mV
∆V
O
(*) Load Regulation IO = 5 mA to 1.5 A TJ = 25°C 300 mV
∆V
O
Quiescent Current TJ = 25°C 3 mA
I
d
Quiescent Current Change IO = 5 mA to 1 A 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 = 1 A TJ = 25°C ∆VO = 100
V
d
V
= -18.5 to -30 V
I
= -20 to -26 V TJ = 25°C 150
V
I
I
= 250 to 750 mA TJ = 25°C 150
O
= -18.5 to -30 V 1
V
I
= 25°C 250 µV
J
= 10 V f = 120Hz 54 60 dB
I
mV
Short Circuit Current 1.3 A
I
sc
(*) Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account
separately. Pulse testing with low duty cycle is used.
-14.3 -15 -15.7 V
1.1 V
5/18
L7900 SERIES
Table 9: Electrical Characteristics Of L7918C (refer to the test circuits, TJ = 0 to 125°C, VI = -27V,
= 500 mA, CI = 2.2 µF, CO = 1 µF unless otherwise specified).
I
O
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
Output Voltage TJ = 25°C -17.3 -18 -18.7 V
O
V
Output Voltage IO = -5 mA to -1 A PO ≤ 15 W
O
(*) Line Regulation VI = -21 to -33 V TJ = 25°C 360 mV
∆V
O
(*) Load Regulation IO = 5 mA to 1.5 A TJ = 25°C 360 mV
∆V
O
Quiescent Current TJ = 25°C 3 mA
I
d
Quiescent Current Change IO = 5 mA to 1 A 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 = 1 A TJ = 25°C ∆VO = 100
V
d
V
= -22 to -33 V
I
= -24 to -30 V TJ = 25°C 180
V
I
I
= 250 to 750 mA TJ = 25°C 180
O
= -22 to -33 V 1
V
I
= 25°C 300 µV
J
= 10 V f = 120Hz 54 60 dB
I
mV
Short Circuit Current 1.1 A
I
sc
(*) Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account
separately. Pulse testing with low duty cycle is used.
-17.1 -18 -18.9 V
1.1 V
Table 10: Electrical Characteristics Of L7920C (refer to the test circuits, TJ = 0 to 125°C, VI = -29V,
= 500 mA, CI = 2.2 µF, CO = 1 µF unless otherwise specified).
I
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 = -5 mA to -1 A PO ≤ 15 W
V
O
(*) Line Regulation VI = -23 to -35 V TJ = 25°C 400 mV
∆V
O
(*) Load Regulation IO = 5 mA to 1.5 A TJ = 25°C 400 mV
∆V
O
Quiescent Current TJ = 25°C 3 mA
I
d
Quiescent Current Change IO = 5 mA to 1 A 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 = 1 A TJ = 25°C ∆VO = 100
V
d
V
= -24 to -35 V
I
= -26 to -32 V TJ = 25°C 200
V
I
I
= 250 to 750 mA TJ = 25°C 200
O
= -24 to -35 V 1
V
I
= 25°C 350 µV
J
= 10 V f = 120Hz 54 60 dB
I
mV
Short Circuit Current 0.9 A
I
sc
(*) Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account
separately. Pulse testing with low duty cycle is used.
-19 -20 -21 V
1.1 V
6/18
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