ST L7900AC User Manual
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L7900AC
2% NEGATIVE VOLTAGE REGULATORS
■ OUTPUT CURRENT UPTO1.5 A
■ OUTPUT VOLTAGESOF-5; -5.2;-6; -8; -12;
-15;-18; -20;-22;-24V
■ THERMAL OVERLOADPROTECTION
■ SHORTCIRCUIT PROTECTION
■ OUTPUT TRANSITION SOA PROTECTION
DESCRIPTION
The L7900AC series of three-terminal negative
regulators is available in TO-220 and D
packages and several fixed output voltages.
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 L7800A 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.
2
PAK
D2PAK
TO-220
SERIES
3
1
SCHEMATIC DIAGRAM
June 1998
1/11
L7900AC
ABSOLUTE MAXIMUMRATINGS
Symbol Parameter Value Unit
DC Input Voltage (forVO=-5 to -18V)
V
i
OutputCurrent Internally limited
I
o
Power Dissipation Internally limited
P
tot
Operating Junction Temperature Range 0 to 125
T
op
StorageTemperature Range - 65 to 150
T
stg
(forV
= -20,-24V)
O
THERMAL DATA
Symbol Parameter D2PAK TO-220 Unit
R
thj-case
R
thj-amb
Thermal Resistance Junction-case Max
Thermal Resistance Junction-ambient Max
3
62.5
CONNECTION DIAGRAM AND ORDERING NUMBERS (top view)
-35
-40
50
3
o
o
V
V
o
C
o
C
C/W
C/W
TO-220 D2PAK
Type TO-220 D
L7905AC
L7952AC
L7906AC
L7908AC
L7912AC
L7915AC
L7918AC
L7920AC
L7922AC
L7924AC
(*) AVAILABLE IN TAPE ANDREELWITH ”-TR” SUFFIX
L7905ACV
L7952ACV
L7906ACV
L7908ACV
L7912ACV
L7915ACV
L7918ACV
L7920ACV
L7922ACV
L7924ACV
APPLICATIONCIRCUIT
2
PAK (*) Output Voltage
L7905ACD2T
L7952ACD2T
L7906ACD2T
L7908ACD2T
L7912ACD2T
L7915ACD2T
L7918ACD2T
L7920ACD2T
L7922ACD2T
L7924ACD2T
-5V
-5.2V
-6V
-8V
-12V
-15V
-18V
-20V
-22V
-24V
2/11
L7900AC
ELECTRICAL CHARACTERISTICS FOR L7905A (refer to the test circuits, Tj= 0 to 125oC,
=-10V, Io=500 mA, Ci= 2.2 µF, Co=1µF unlessotherwise specified)
V
i
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
OutputVoltage Tj=25oC -4.9-5-5.1V
o
V
OutputVoltage Io=-5mAto-1A Po≤15 W
o
* Line Regulation Vi=-7 to -25 V Tj=25oC
∆V
o
∆V
* Load Regulation Io= 5 to 1500 mA Tj=25oC
o
I
Quiescent Current Tj=25oC3mA
d
∆I
Quiescent Current Change Io= 5 to 1000 mA 0.5 mA
d
∆I
Quiescent Current Change Vi=-8 to -25 V 1.3 mA
d
∆
V
OutputVoltage Drift Io= 5 mA -0.4 mV/oC
o
∆
T
OutputNoise Voltage B = 10Hz to 100KHz Tj=25oC 100 µV
e
N
SVR Supply Voltage Rejection ∆V
V
Dropout Voltage Io=1A Tj=25oC
d
ShortCircuitCurrent 2.1 A
I
sc
I
ShortCircuitPeak Current Tj=25oC2.5A
scp
=8 to 20 V
V
i
=-8 to -12 V Tj=25oC
V
i
= 250 to 750mA Tj=25oC
I
o
=10V f=120Hz 54 60 dB
i
=100mV
∆V
O
-4.8 -5 -5.2 V
100
50
100
50
1.4 V
mV
mV
mV
mV
ELECTRICAL CHARACTERISTICS FOR L7952A (refer to the test circuits, Tj= 0 to 125oC,
=-10V, Io=500 mA, Ci= 2.2 µF, Co=1µF unlessotherwise specified)
V
i
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
OutputVoltage Tj=25oC -5.1 -5. 2 -5. 3 V
o
V
OutputVoltage Io=-5mAto-1A Po≤15 W
o
* Line Regulation Vi=-8 to -25 V Tj=25oC
∆V
o
∆V
* Load Regulation Io= 5 to 1500 mA Tj=25oC
o
I
Quiescent Current Tj=25oC3mA
d
∆I
Quiescent Current Change Io= 5 to 1000 mA 0.5 mA
d
∆I
Quiescent Current Change Vi=-9 to -25 V 1.3 mA
d
∆
V
OutputVoltage Drift Io= 5 mA -0.5 mV/oC
o
∆
T
OutputNoise Voltage B = 10Hz to 100KHz Tj=25oC 125 µV
e
N
SVR Supply Voltage Rejection ∆V
V
Dropout Voltage Io=1A Tj=25oC
d
ShortCircuitCurrent 2.1 A
I
sc
I
ShortCircuitPeak Current Tj=25oC2.5A
scp
* Load and line regulation are specified at constant junction temperature. Changes in Vodue to heating effects must be taken into account
separately. Pulce testing with lowduty cycle isused.
=-9 to -21 V
V
i
=-9 to -13 V Tj=25oC
V
i
= 250 to 750mA Tj=25oC
I
o
=10V f=120Hz 54 60 dB
i
=100mV
∆V
O
-5 -5.2 -5.4 V
105
52
105
52
mV
mV
mV
mV
1.4 V
3/11
L7900AC
ELECTRICAL CHARACTERISTICS FOR L7906A (refer to the test circuits, Tj= 0 to 125oC,
=-11V, Io=500 mA, Ci= 2.2 µF, Co=1µF unlessotherwise specified)
V
i
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
OutputVoltage Tj=25oC -5.88 -6 -6. 12 V
o
V
OutputVoltage Io=-5mAto-1A Po≤15 W
o
* Line Regulation Vi=-8.5to -25V Tj=25oC
∆V
o
∆V
* Load Regulation Io= 5 to 1500 mA Tj=25oC
o
I
Quiescent Current Tj=25oC3mA
d
∆I
Quiescent Current Change Io= 5 to 1000 mA 0.5 mA
d
∆I
Quiescent Current Change Vi=-9.5to -25V 1.3 mA
d
∆
V
OutputVoltage Drift Io= 5 mA -0.6 mV/oC
o
∆
T
OutputNoise Voltage B = 10Hz to 100KHz Tj=25oC 144 µV
e
N
SVR Supply Voltage Rejection ∆V
V
Dropout Voltage Io=1A Tj=25oC
d
ShortCircuitCurrent 2 A
I
sc
I
ShortCircuitPeak Current Tj=25oC2.5A
scp
=-9.5to -21.5V
V
i
=-9 to -15 V Tj=25oC
V
i
= 250 to 750mA Tj=25oC
I
o
=10V f=120Hz 54 60 dB
i
=100mV
∆V
O
-5. 76 -6 -6.24 V
120
60
120
60
1.4 V
mV
mV
mV
mV
ELECTRICAL CHARACTERISTICS FOR L7908A (refer to the test circuits, Tj= 0 to 125oC,
=-14V, Io=500 mA, Ci= 2.2 µF, Co=1µF unlessotherwise specified)
V
i
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
OutputVoltage Tj=25oC -7.84 -8 -8. 16 V
o
V
OutputVoltage Io=-5mAto-1A Po≤15 W
o
* Line Regulation Vi=-10.5to -25V Tj=25oC
∆V
o
∆V
* Load Regulation Io= 5 to 1500 mA Tj=25oC
o
I
Quiescent Current Tj=25oC3mA
d
∆I
Quiescent Current Change Io= 5 to 1000 mA 0.5 mA
d
∆I
Quiescent Current Change Vi=-11.5to -25V 1 mA
d
∆
V
OutputVoltage Drift Io= 5 mA -0.6 mV/oC
o
∆
T
OutputNoise Voltage B = 10Hz to 100KHz Tj=25oC 175 µV
e
N
SVR Supply Voltage Rejection ∆V
V
Dropout Voltage Io=1A Tj=25oC
d
ShortCircuitCurrent 1.5 A
I
sc
I
ShortCircuitPeak Current Tj=25oC2.5A
scp
* Load and line regulation are specified at constant junction temperature. Changes in Vodue to heating effects must be taken into account
separately. Pulce testing with lowduty cycle isused.
=-11.5to -23V
V
i
=-11 to -17V Tj=25oC
V
i
= 250 to 750mA Tj=25oC
I
o
=10V f=120Hz 54 60 dB
i
=100mV
∆V
O
-7. 68 -8 -8.32 V
160
80
160
80
mV
mV
mV
mV
1.1 V
4/11
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