The L7900 series of three-terminal negative
regulators is available in TO-220, TO-220FP, TO-3
2
and D
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.
PAK packages and several fixed output
L7900 series
Negative voltage regulators
TO-220
D2PA K
Although designed primarily as fixed voltage
regulators, these devices can be used with
external components to obtain adjustable
voltages and currents.
Note:Absolute Maximum Ratings are those values beyond which damage to the device may
occur. Functional operation under these condition is not implied
Table 2.Thermal Data
SymbolParameterD2PAKTO-220TO-220FPTO-3Unit
R
R
Thermal resistance junction-case3354°C/W
thJC
Thermal resistance junction-ambient62.5506035°C/W
thJA
4/24
Page 5
L7900 seriesTest circuit
3 Test circuit
Figure 2.Test circuit
5/24
Page 6
Electrical characteristicsL7900 series
4 Electrical characteristics
Table 3.Electrical characteristics of L7905C (refer to the test circuits, TJ = 0 to 125°C, VI = -10V,
I
= 500 mA, CI = 2.2 µF, CO = 1 µF unless otherwise specified)
O
SymbolParameterTest conditionsMin.Typ.Max.Unit
V
V
∆V
∆V
∆I
∆V
Output voltageTJ = 25°C-4.8-5-5.2V
O
Output voltage
O
(1)
Line regulation
O
(1)
Load regulation
O
I
Quiescent currentTJ = 25°C3mA
d
Quiescent current change
d
/∆TOutput voltage driftIO = 5 mA-0.4mV/°C
O
IO = -5 mA to -1 A, PO ≤ 15 W
V
= -8 to -20 V
I
V
= -7 to -25 V, TJ = 25°C100
I
= -8 to -12 V, TJ = 25°C50
V
I
I
= 5 mA to 1.5 A, TJ = 25°C100
O
= 250 to 750 mA, TJ = 25°C50
I
O
I
= 5 mA to 1 A0.5
O
= -8 to -25 V1.3
V
I
-4.75-5-5.25V
eNOutput noise voltageB = 10Hz to 100KHz, TJ = 25°C100µV
SVRSupply voltage rejection∆V
V
I
1. 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.
Table 4.Electrical characteristics of L7906C (refer to the test circuits, TJ = 0 to 125°C, VI = -11V,
I
= 500 mA, CI = 2.2 µF, CO = 1 µF unless otherwise specified)
O
SymbolParameterTest conditionsMin.Typ.Max.Unit
V
V
∆V
∆V
∆I
∆V
Output voltageTJ = 25°C-5.75-6-6.25V
O
Output voltage
O
(1)
Line regulation
O
(1)
Load regulation
O
I
Quiescent currentTJ = 25°C3mA
d
Quiescent current change
d
/∆TOutput voltage driftIO = 5 mA-0.6mV/°C
O
IO = -5 mA to -1 A, PO ≤ 15 W
V
= -9.5 to -21.5 V
I
V
= -8.5 to -25 V, TJ = 25°C120
I
= -9 to -15 V, TJ = 25°C60
V
I
I
= 5 mA to 1.5 A, TJ = 25°C120
O
= 250 to 750 mA, TJ = 25°C60
I
O
I
= 5 mA to 1 A0.5
O
= -9.5 to -25 V1.3
V
I
-5.7-6-6.3V
mV
mV
mA
eNOutput noise voltageB = 10Hz to 100KHz, TJ = 25°C144µV
SVRSupply voltage rejection∆V
V
I
1. 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.
Table 5.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)
O
= 10 V, f = 120Hz5460dB
I
SymbolParameterTest conditionsMin.Typ.Max.Unit
V
V
∆V
∆V
∆I
∆V
eNOutput noise voltageB = 10Hz to 100KHz, T
Output voltageTJ = 25°C-7.7-8-8.3V
O
= -5 mA to -1 A, PO ≤ 15 W
I
Output voltage
O
(1)
Line regulation
O
(1)
Load regulation
O
I
Quiescent currentTJ = 25°C3mA
d
Quiescent current change
d
/∆TOutput voltage driftIO = 5 mA-0.6mV/°C
O
O
= -11.5 to -23 V
V
I
V
= -10.5 to -25 V, TJ = 25°C160
I
= -11 to -17 V, TJ = 25°C80
V
I
= 5 mA to 1.5 A, TJ = 25°C160
I
O
-7.6-8-8.4V
IO = 250 to 750 mA, TJ = 25°C80
I
= 5 mA to 1 A0.5
O
VI = -11.5 to -25 V1
= 25°C175µV
J
SVRSupply voltage rejection∆VI = 10 V, f = 120Hz5460dB
V
I
1. 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.
Table 6.Electrical characteristics of L7912C (refer to the test circuits, TJ = 0 to 125°C, VI = -19V,
I
= 500 mA, CI = 2.2 µF, CO = 1 µF unless otherwise specified)
O
SymbolParameterTest conditionsMin.Typ.Max.Unit
V
V
∆V
∆V
∆I
Output voltageTJ = 25°C-11.5-12-12.5V
O
= -5 mA to -1 A, PO ≤ 15 W
I
Output voltage
O
(1)
Line regulation
O
(1)
Load regulation
O
I
Quiescent currentTJ = 25°C3mA
d
Quiescent current change
d
O
= -15.5 to -27 V
V
I
= -14.5 to -30 V, TJ = 25°C240
V
I
-11.4-12-12.6V
VI = -16 to -22 V, TJ = 25°C120
I
= 5 mA to 1.5 A, TJ = 25°C240
O
= 250 to 750 mA, TJ = 25°C120
I
O
I
= 5 mA to 1 A0.5
O
= -15 to -30 V1
V
I
mV
mV
mA
∆VO/∆TOutput voltage driftIO = 5 mA-0.8mV/°C
eNOutput noise voltageB = 10Hz to 100KHz, T
SVRSupply voltage rejection∆V
V
I
1. 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.
Table 7.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)
O
= 10 V, f = 120Hz5460dB
I
= 25°C200µV
J
SymbolParameterTest conditionsMin.Typ.Max.Unit
V
V
∆V
∆V
∆I
∆V
Output voltageTJ = 25°C-14.4-15-15.6V
O
Output voltage
O
(1)
Line regulation
O
(1)
Load regulation
O
I
Quiescent currentTJ = 25°C3mA
d
Quiescent current change
d
/∆TOutput voltage driftIO = 5 mA-0.9mV/°C
O
IO = -5 mA to -1 A, PO ≤ 15 W
V
= -18.5 to -30 V
I
V
= -17.5 to -30 V, TJ = 25°C300
I
= -20 to -26 V, TJ = 25°C150
V
I
I
= 5 mA to 1.5 A, TJ = 25°C300
O
= 250 to 750 mA, TJ = 25°C150
I
O
I
= 5 mA to 1 A0.5
O
= -18.5 to -30 V1
V
I
-14.3-15-15.7V
eNOutput noise voltageB = 10Hz to 100KHz, TJ = 25°C250µV
SVRSupply voltage rejection∆V
V
I
1. 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.
Table 8.Electrical characteristics of L7918C (refer to the test circuits, TJ = 0 to 125°C, VI = -27V,
I
= 500 mA, CI = 2.2 µF, CO = 1 µF unless otherwise specified)
O
SymbolParameterTest conditionsMin.Typ.Max.Unit
V
V
∆V
∆V
∆I
Output voltageTJ = 25°C-17.3-18-18.7V
O
= -5 mA to -1 A, PO ≤ 15 W
I
Output voltage
O
(1)
Line regulation
O
(1)
Load regulation
O
I
Quiescent currentTJ = 25°C3mA
d
Quiescent current change
d
O
= -22 to -33 V
V
I
= -21 to -33 V, TJ = 25°C360
V
I
-17.1-18-18.9V
VI = -24 to -30 V, TJ = 25°C180
I
= 5 mA to 1.5 A, TJ = 25°C360
O
= 250 to 750 mA, TJ = 25°C180
I
O
I
= 5 mA to 1 A0.5
O
= -22 to -33 V1
V
I
mV
mV
mA
∆VO/∆TOutput voltage driftIO = 5 mA-1mV/°C
eNOutput noise voltageB = 10Hz to 100KHz, T
SVRSupply voltage rejection∆V
V
I
1. 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.
Table 9.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)
O
= 10 V, f = 120Hz5460dB
I
= 25°C300µV
J
SymbolParameterTest conditionsMin.Typ.Max.Unit
V
V
∆V
∆V
∆I
∆V
Output voltageTJ = 25°C-19.2-20-20.8V
O
Output voltage
O
(1)
Line regulation
O
(1)
Load regulation
O
I
Quiescent currentTJ = 25°C3mA
d
Quiescent current change
d
/∆TOutput voltage driftIO = 5 mA-1.1mV/°C
O
IO = -5 mA to -1 A, PO ≤ 15 W
V
= -24 to -35 V
I
V
= -23 to -35 V, TJ = 25°C400
I
= -26 to -32 V, TJ = 25°C200
V
I
I
= 5 mA to 1.5 A, TJ = 25°C400
O
= 250 to 750 mA, TJ = 25°C200
I
O
I
= 5 mA to 1 A0.5
O
= -24 to -35 V1
V
I
-19-20-21V
eNOutput noise voltageB = 10Hz to 100KHz, TJ = 25°C350µV
SVRSupply voltage rejection∆V
V
I
1. 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.
Table 10.Electrical characteristics of L7924C (refer to the test circuits, TJ = 0 to 125°C, VI = -33V,
I
= 500 mA, CI = 2.2 µF, CO = 1 µF unless otherwise specified)
O
SymbolParameterTest conditionsMin.Typ.Max.Unit
V
V
∆V
∆V
∆I
Output voltageTJ = 25°C-23-24-24.5V
O
= -5 mA to -1 A, PO ≤ 15 W
I
Output voltage
O
(1)
Line regulation
O
(1)
Load regulation
O
I
Quiescent currentTJ = 25°C3mA
d
Quiescent current change
d
O
= -27 to -38 V
V
I
= -27 to -38 V, TJ = 25°C480
V
I
-22.8-24-25.2V
VI = -30 to -36 V, TJ = 25°C240
I
= 5 mA to 1.5 A, TJ = 25°C480
O
= 250 to 750 mA, TJ = 25°C240
I
O
I
= 5 mA to 1 A0.5
O
= -27 to -38 V1
V
I
mV
mV
mA
∆VO/∆TOutput voltage driftIO = 5 mA-1mV/°C
eNOutput noise voltageB = 10Hz to 100KHz, T
SVRSupply voltage rejection∆V
V
I
1. 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.
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 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.
Figure 4.Split power supply (± 15V - 1 A)
(*) Against potential latch-up problems.
11/24
Page 12
Application informationL7900 series
Figure 5.Circuit for increasing output voltage
VO=VXX(R1+R2)/R
VXX/R2 > 3I
2
d
C3 Optional for improved transient response and ripple rejection.
Figure 6.High current negative regulator (-5V/4A with 5A current limiting)
12/24
Page 13
L7900 seriesPackage mechanical data
6 Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK®
packages. These packages have a Lead-free second level interconnect. The category of
second Level Interconnect is marked on the package and on the inner box label, in
compliance with JEDEC Standard JESD97. The maximum ratings related to soldering
conditions are also marked on the inner box label. ECOPACK is an ST trademark.
ECOPACK specifications are available at: www.st.com.
31-Aug-200510Add new order codes (TO-220 E Type) on Table 3, pag. 3.
2
D
19-Jan-200711
PAK mechanical data has been updated, add footprint data and the
document has been reformatted.
23/24
Page 24
L7900 series
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