LM2990T-15/NOPB National Semiconductor, LM2990T-15/NOPB Datasheet - Page 9
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LM2990T-15/NOPB
Manufacturer Part Number
LM2990T-15/NOPB
Description
IC REGULATOR NEG LDO TO220-3
Manufacturer
National Semiconductor
Type
Regulatorr
Specifications of LM2990T-15/NOPB
Regulator Topology
Negative Fixed
Voltage - Output
-15V
Voltage - Input
Down to -26V
Voltage - Dropout (typical)
0.6V @ 1A
Number Of Regulators
1
Current - Output
1.8A
Operating Temperature
-40°C ~ 125°C
Mounting Type
Through Hole
Package / Case
TO-220-3 (Straight Leads)
Current, Output
1 A
Current, Supply
9 mA
Package Type
TO-220
Regulation, Line
6 V
Regulation, Load
3 V
Regulator Type
Low Dropout, Negative Voltage Out
Resistance, Thermal, Junction To Case
3 °C/W
Temperature, Operating, Range
-40 to +125 °C
Voltage, Dropout
0.6 V
Voltage, Input
-26 V
Voltage, Noise
600 μV
Voltage, Output
15 V
Voltage Regulator Type
Linear
Topology
LDO
Regulator Output Type
Fixed
Polarity Type
Negative
Number Of Outputs
Single
Input Voltage (min)
-26V
Input Voltage (max)
0.3V
Output Voltage
-15V
Output Current
1.8(Typ)A
Load Regulation
50mV
Line Regulation
60mV
Output Voltage Accuracy
±5%
Operating Temp Range
-40C to 125C
Operating Temperature Classification
Automotive
Dropout Voltage@current (max)
0.3@100mA/1@1A
Dropout Voltage@current (typ)
0.1@100mA/0.6@1A
Pin Count
3 +Tab
Mounting
Through Hole
Quiescent Current (max)
5mA
Polarity
Negative
Input Voltage Max
0.3 V
Output Type
Fixed
Dropout Voltage (max)
0.3 V at 100 mA
Voltage Regulation Accuracy
+/- 5 %
Maximum Operating Temperature
+ 125 C
Mounting Style
Through Hole
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Limit (min)
-
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
Other names
*LM2990T-15
*LM2990T-15/NOPB
LM2990T-15
*LM2990T-15/NOPB
LM2990T-15
Application Hints
EXTERNAL CAPACITORS
The LM2990 regulator requires an output capacitor to main-
tain stability. The capacitor must be at least 10 μF aluminum
electrolytic or 1 μF solid tantalum. The output capacitor's ESR
must be less than 10Ω, or the zero added to the regulator
frequency response by the ESR could reduce the phase mar-
gin, creating oscillations (refer to the graph on the right). An
input capacitor, of at least 1 μF solid tantalum or 10 μF alu-
minum electrolytic, is also needed if the regulator is situated
more than 6 from the input power supply filter.
FORCING THE OUTPUT POSITIVE
Due to an internal clamp circuit, the LM2990 can withstand
positive voltages on its output. If the voltage source pulling
the output positive is DC, the current must be limited to 1.5A.
A current over 1.5A fed back into the LM2990 could damage
the device. The LM2990 output can also withstand fast posi-
tive voltage transients up to 26V, without any current limiting
of the source. However, if the transients have a duration of
9
over 1 ms, the output should be clamped with a Schottky
diode to ground.
Output Capacitor ESR
1080109
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