L7900AC
SERIES
2% NEGATIVE VOLTAGE REGULATORS
November 1999
■OUTPUT CURRENT UP TO1.5 A
■OUTPUT VOLTAGESOF -5;-5.2; -6;-8; -12;
-15;-18;-20; -22; -24V
■THERMAL OVERLOADPROTECTION
■SHORT CIRCUIT PROTECTION
■OUTPUT TRANSITION SOAPROTECTION
DESCRIPTION
The L7900AC series of three-terminal negative
regulators is available in TO-220 and D2PAK
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. TO-220
13
D2PAK
SCHEMATIC DIAGRAM
1/11
CONNECTION DIAGRAM AND ORDERING NUMBERS (top view)
TO-220 D2PAK
THERMALDATA
Symbol Parameter D2PAK TO-220 Unit
Rthj-case
Rthj-amb Thermal Resistance Junction-case Max
Thermal Resistance Junction-ambient Max 3
62.5 3
50
oC/W
oC/W
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
ViDC InputVoltage (for VO= -5to-18V)
(forVO= -20,-24V) -35
-40 V
V
IoOutputCurrent Internally limited
Ptot Power Dissipation Internally limited
Top Operating Junction TemperatureRange 0 to 125 oC
Tstg StorageTemperature Range - 65 to 150 oC
Type TO-220 D2PAK (*) Output Voltage
L7905AC
L7952AC
L7906AC
L7908AC
L7912AC
L7915AC
L7918AC
L7920AC
L7922AC
L7924AC
L7905ACV
L7952ACV
L7906ACV
L7908ACV
L7912ACV
L7915ACV
L7918ACV
L7920ACV
L7922ACV
L7924ACV
L7905ACD2T
L7952ACD2T
L7906ACD2T
L7908ACD2T
L7912ACD2T
L7915ACD2T
L7918ACD2T
L7920ACD2T
L7922ACD2T
L7924ACD2T
-5V
-5.2V
-6V
-8V
-12V
-15V
-18V
-20V
-22V
-24V
(*) AVAILABLEIN TAPEAND REEL WITH ”-TR” SUFFIX
APPLICATION CIRCUIT
L7900AC
2/11
* 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.
ELECTRICALCHARACTERISTICS FOR L7905A(refer to the test circuits, Tj= 0 to 125 oC,
Vi= -10V, Io= 500mA, Ci= 2.2 µF, Co=1µF unless otherwisespecified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VoOutputVoltage Tj=25o
C-4.9-5-5.1V
V
o
OutputVoltage Io=-5mAto-1A Po≤15 W
Vi= 8 to20 V -4.8 -5 -5.2 V
∆Vo* LineRegulation Vi=-7to-25V T
j=25o
C
Vi=-8to-12V T
j=25o
C100
50 mV
mV
∆Vo* LoadRegulation Io= 5 to 1500 mA Tj=25o
C
I
o= 250 to 750mA Tj=25o
C100
50 mV
mV
IdQuiescent Current Tj=25o
C3mA
∆I
d
Quiescent Current Change Io= 5 to 1000 mA 0.5 mA
∆IdQuiescent Current Change Vi=-8to-25V 1.3 mA
∆
V
o
∆
T
OutputVoltageDrift Io=5 mA -0.4 mV/oC
eNOutput Noise Voltage B = 10Hz to 100KHz Tj=25o
C100
µ
V
SVR Supply Voltage Rejection ∆Vi=10 V f= 120Hz 54 60 dB
VdDropout Voltage Io=1A T
j=25o
C
∆V
O=100mV 1.4 V
Isc Short Circuit Current 2.1 A
Iscp Short Circuit Peak Current Tj=25o
C2.5A
ELECTRICALCHARACTERISTICS FOR L7952A(refer to the test circuits, Tj= 0 to 125 oC,
Vi= -10V, Io= 500mA, Ci= 2.2 µF, Co=1µF unless otherwisespecified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VoOutputVoltage Tj=25o
C -5.1 -5.2 -5.3 V
VoOutputVoltage Io=-5mAto-1A Po≤15 W
Vi=-9to-21V -5 -5.2 -5.4 V
∆Vo* LineRegulation Vi=-8to-25V T
j=25o
C
Vi=-9to-13V T
j=25o
C105
52 mV
mV
∆Vo* LoadRegulation Io= 5 to 1500 mA Tj=25o
C
I
o= 250 to 750mA Tj=25o
C105
52 mV
mV
IdQuiescent Current Tj=25o
C3mA
∆I
d
Quiescent Current Change Io= 5 to 1000 mA 0.5 mA
∆IdQuiescent Current Change Vi=-9to-25V 1.3 mA
∆
V
o
∆
T
OutputVoltageDrift Io=5 mA -0.5 mV/oC
eNOutput Noise Voltage B = 10Hz to 100KHz Tj=25o
C125µV
SVR Supply Voltage Rejection ∆Vi=10 V f= 120Hz 54 60 dB
VdDropout Voltage Io=1A T
j=25o
C
∆
V
O=100mV 1.4 V
Isc Short Circuit Current 2.1 A
Iscp Short Circuit Peak Current Tj=25o
C2.5A
L7900AC
3/11
* 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.
ELECTRICALCHARACTERISTICS FOR L7906A(refer to the test circuits, Tj= 0 to 125 oC,
Vi= -11V, Io= 500mA, Ci= 2.2 µF, Co=1µF unless otherwisespecified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VoOutputVoltage Tj=25o
C -5.88 -6 -6.12 V
VoOutputVoltage Io=-5mAto-1A Po≤15 W
Vi= -9.5to -21.5 V -5.76 -6 -6.24 V
∆Vo* LineRegulation Vi= -8.5to -25 V Tj=25o
C
Vi=-9to-15V T
j=25o
C120
60 mV
mV
∆Vo* LoadRegulation Io= 5 to 1500 mA Tj=25o
C
I
o= 250 to 750mA Tj=25o
C120
60 mV
mV
IdQuiescent Current Tj=25o
C3mA
∆I
d
Quiescent Current Change Io= 5 to 1000 mA 0.5 mA
∆IdQuiescent Current Change Vi= -9.5to -25 V 1.3 mA
∆
V
o
∆
T
OutputVoltageDrift Io=5 mA -0.6 mV/oC
eNOutput Noise Voltage B = 10Hz to 100KHz Tj=25o
C144
µ
V
SVR Supply Voltage Rejection ∆Vi=10 V f= 120Hz 54 60 dB
VdDropout Voltage Io=1A T
j=25o
C
∆V
O=100mV 1.4 V
Isc Short Circuit Current 2 A
Iscp Short Circuit Peak Current Tj=25o
C2.5A
ELECTRICALCHARACTERISTICS FOR L7908A(refer to the test circuits, Tj= 0 to 125 oC,
Vi= -14V, Io= 500mA, Ci= 2.2 µF, Co=1µF unless otherwisespecified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VoOutputVoltage Tj=25o
C -7.84 -8 -8.16 V
VoOutputVoltage Io=-5mAto-1A Po≤15 W
Vi= -11.5 to -23 V -7.68 -8 -8.32 V
∆Vo* LineRegulation Vi= -10.5 to -25 V Tj=25o
C
Vi= -11 to -17 V Tj=25o
C160
80 mV
mV
∆Vo* LoadRegulation Io= 5 to 1500 mA Tj=25o
C
I
o= 250 to 750mA Tj=25o
C160
80 mV
mV
IdQuiescent Current Tj=25o
C3mA
∆I
d
Quiescent Current Change Io= 5 to 1000 mA 0.5 mA
∆IdQuiescent Current Change Vi= -11.5 to -25 V 1 mA
∆
V
o
∆
T
OutputVoltageDrift Io=5 mA -0.6 mV/oC
eNOutput Noise Voltage B = 10Hz to 100KHz Tj=25o
C175µV
SVR Supply Voltage Rejection ∆Vi=10 V f= 120Hz 54 60 dB
VdDropout Voltage Io=1A T
j=25o
C
∆
V
O=100mV 1.1 V
Isc Short Circuit Current 1.5 A
Iscp Short Circuit Peak Current Tj=25o
C2.5A
L7900AC
4/11
* 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.
ELECTRICALCHARACTERISTICS FOR L7912A(refer to the test circuits, Tj= 0 to 125 oC,
Vi= -19V, Io= 500mA, Ci= 2.2 µF, Co=1µF unless otherwisespecified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VoOutputVoltage Tj=25o
C -11.75 -12 -12.25 V
VoOutputVoltage Io=-5mAto-1A Po≤15 W
Vi= -15.5 to -27 V -11.5 -12 -12.5 V
∆Vo* LineRegulation Vi= -14.5 to -30 V Tj=25o
C
Vi= -16 to -22 V Tj=25o
C240
120 mV
mV
∆Vo* LoadRegulation Io= 5 to 1500 mA Tj=25o
C
I
o= 250 to 750mA Tj=25o
C240
120 mV
mV
IdQuiescent Current Tj=25o
C3mA
∆I
d
Quiescent Current Change Io= 5 to 1000 mA 0.5 mA
∆IdQuiescent Current Change Vi= -15 to -25 V 1 mA
∆
V
o
∆
T
OutputVoltageDrift Io=5 mA -0.8 mV/oC
eNOutput Noise Voltage B = 10Hz to 100KHz Tj=25o
C200
µ
V
SVR Supply Voltage Rejection ∆Vi=10 V f= 120Hz 54 60 dB
VdDropout Voltage Io=1A T
j=25o
C
∆V
O=100mV 1.1 V
Isc Short Circuit Current 1.5 A
Iscp Short Circuit Peak Current Tj=25o
C2.5A
ELECTRICALCHARACTERISTICS FOR L7915A(refer to the test circuits, Tj= 0 to 125 oC,
Vi= -23V, Io= 500mA, Ci= 2.2 µF, Co=1µF unless otherwisespecified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VoOutputVoltage Tj=25o
C -14.7 -15 -15.3 V
VoOutputVoltage Io=-5mAto-1A Po≤15 W
Vi= -18.5 to -30 V -14.4 -15 -15.6 V
∆Vo* LineRegulation Vi= -17.5 to -30 V Tj=25o
C
Vi= -20 to -26 V Tj=25o
C300
150 mV
mV
∆Vo* LoadRegulation Io= 5 to 1500 mA Tj=25o
C
I
o= 250 to 750mA Tj=25o
C300
150 mV
mV
IdQuiescent Current Tj=25o
C3mA
∆I
d
Quiescent Current Change Io= 5 to 1000 mA 0.5 mA
∆IdQuiescent Current Change Vi= -18.5 to -30 V 1 mA
∆
V
o
∆
T
OutputVoltageDrift Io=5 mA -0.9 mV/oC
eNOutput Noise Voltage B = 10Hz to 100KHz Tj=25o
C250µV
SVR Supply Voltage Rejection ∆Vi=10 V f= 120Hz 54 60 dB
VdDropout Voltage Io=1A T
j=25o
C
∆
V
O=100mV 1.1 V
Isc Short Circuit Current 1.3 A
Iscp Short Circuit Peak Current Tj=25o
C2.3A
L7900AC
5/11
* 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.
ELECTRICALCHARACTERISTICS FOR L7918A(refer to the test circuits, Tj= 0 to 125 oC,
Vi= -27V, Io= 500mA, Ci= 2.2 µF, Co=1µF unless otherwisespecified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VoOutputVoltage Tj=25o
C -17.64 -18 -18.36 V
VoOutputVoltage Io=-5mAto-1A Po≤15 W
Vi= -22 to -33 V -17.3 -18 -18.7 V
∆Vo* LineRegulation Vi= -21 to -33 V Tj=25o
C
V
i= -24 to -30 V Tj=25o
C360
180 mV
mV
∆Vo* LoadRegulation Io= 5 to 1500 mA Tj=25o
C
I
o= 250 to 750mA Tj=25o
C360
180 mV
mV
IdQuiescent Current Tj=25o
C3mA
∆I
d
Quiescent Current Change Io= 5 to 1000 mA 0.5 mA
∆IdQuiescent Current Change Vi= -22 to -33 V 1 mA
∆
V
o
∆
T
OutputVoltageDrift Io=5 mA -1 mV/oC
eNOutput Noise Voltage B = 10Hz to 100KHz Tj=25o
C300
µ
V
SVR Supply Voltage Rejection ∆Vi=10 V f= 120Hz 54 60 dB
VdDropout Voltage Io=1A T
j=25o
C
∆V
O=100mV 1.1 V
Isc Short Circuit Current 1.1 A
Iscp Short Circuit Peak Current Tj=25o
C2.2A
ELECTRICALCHARACTERISTICS FOR L7920A(refer to the test circuits, Tj= 0 to 125 oC,
Vi= -29V, Io= 500mA, Ci= 2.2 µF, Co=1µF unless otherwisespecified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VoOutputVoltage Tj=25o
C -19.6 -20 -20.4 V
VoOutputVoltage Io=-5mAto-1A Po≤15 W
Vi= -24 to -35 V -19.2 -20 -20.8 V
∆Vo* LineRegulation Vi= -23 to -35 V Tj=25o
C
V
i= -26 to -32 V Tj=25o
C400
200 mV
mV
∆Vo* LoadRegulation Io= 5 to 1500 mA Tj=25o
C
I
o= 250 to 750mA Tj=25o
C400
200 mV
mV
IdQuiescent Current Tj=25o
C3mA
∆I
d
Quiescent Current Change Io= 5 to 1000 mA 0.5 mA
∆IdQuiescent Current Change Vi= -24 to -35 V 1 mA
∆
V
o
∆
T
OutputVoltageDrift Io=5 mA -1.1 mV/oC
eNOutput Noise Voltage B = 10Hz to 100KHz Tj=25o
C350µV
SVR Supply Voltage Rejection ∆Vi=10 V f= 120Hz 54 60 dB
VdDropout Voltage Io=1A T
j=25o
C
∆
V
O=100mV 1.1 V
Isc Short Circuit Current 0.9 A
Iscp Short Circuit Peak Current Tj=25o
C2.2A
L7900AC
6/11
* 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.
ELECTRICALCHARACTERISTICS FOR L7922A(refer to the test circuits, Tj= 0 to 125 oC,
Vi= -31V, Io= 500mA, Ci= 2.2 µF, Co=1µF unless otherwisespecified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VoOutputVoltage Tj=25o
C -21.5 -22 -22.4 V
VoOutputVoltage Io=-5mAto-1A Po≤15 W
Vi= -26 to -37 V -21.1 -22 -22.8 V
∆Vo* LineRegulation Vi= -25 to -37 V Tj=25o
C
V
i= -28 to -34 V Tj=25o
C440
220 mV
mV
∆Vo* LoadRegulation Io= 5 to 1500 mA Tj=25o
C
I
o= 250 to 750mA Tj=25o
C440
220 mV
mV
IdQuiescent Current Tj=25o
C3mA
∆I
d
Quiescent Current Change Io= 5 to 1000 mA 0.5 mA
∆IdQuiescent Current Change Vi= -26 to -37 V 1 mA
∆
V
o
∆
T
OutputVoltageDrift Io=5 mA -1.1 mV/oC
eNOutput Noise Voltage B = 10Hz to 100KHz Tj=25o
C375
µ
V
SVR Supply Voltage Rejection ∆Vi=10 V f= 120Hz 54 60 dB
VdDropout Voltage Io=1A T
j=25o
C
∆V
O=100mV 1.1 V
Isc Short Circuit Current 1.1 A
Iscp Short Circuit Peak Current Tj=25o
C2.2A
ELECTRICALCHARACTERISTICS FOR L7924A(refer to the test circuits, Tj= 0 to 125 oC,
Vi= -33V, Io= 500mA, Ci= 2.2 µF, Co=1µF unless otherwisespecified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VoOutputVoltage Tj=25o
C -23.5 -24 -24.5 V
VoOutputVoltage Io=-5mAto-1A Po≤15 W
Vi= -27 to -38 V -23 -24 -25 V
∆Vo* LineRegulation Vi= -27 to -38 V Tj=25o
C
V
i= -30 to -36 V Tj=25o
C480
240 mV
mV
∆Vo* LoadRegulation Io= 5 to 1500 mA Tj=25o
C
I
o= 250 to 750mA Tj=25o
C480
240 mV
mV
IdQuiescent Current Tj=25o
C3mA
∆I
d
Quiescent Current Change Io= 5 to 1000 mA 0.5 mA
∆IdQuiescent Current Change Vi= -27 to -38 V 1 mA
∆
V
o
∆
T
OutputVoltageDrift Io=5 mA -1 mV/oC
eNOutput Noise Voltage B = 10Hz to 100KHz Tj=25o
C400µV
SVR Supply Voltage Rejection ∆Vi=10 V f= 120Hz 54 60 dB
VdDropout Voltage Io=1A T
j=25o
C
∆
V
O=100mV 1.1 V
Isc Short Circuit Current 1.1 A
Iscp Short Circuit Peak Current Tj=25o
C2.2A
L7900AC
7/11
Figure 1 : Fixed Output Regulator. Figure 2 : Split PowerSupply (±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. C1is 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 Increasing OutputVoltage. Figure 4 : High CurrentNegative Regulator
(– 5V/4A with 5A current limiting).
C3 Optional for improvedtransient responseand ripple rejection.
Figure 5 : Typical ECL System PowerSupply
(– 5.2V/4A).
Optional dropping resistor to reduce the power dissipated in the
boost transistor.
VO=
V
XX
R
1+
R
2
R
2
V
XX
R
2>3
I
d
L7900AC
8/11
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
L7900AC
9/11
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) MECHANICAL DATA
L7900AC
10/11
Information furnished isbelieved to be accurate and reliable. However, STMicroelectronics assumes no responsibility forthe consequences
of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is
granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are
subject tochange without notice. Thispublication supersedes andreplaces all information previously supplied. STMicroelectronics products
are not authorized for use as critical components in lifesupport devices or systems withoutexpress written approval of STMicroelectronics.
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L7900AC
11/11
