(China (Mainland))
Product Summary
General Description:The LM2990 is a three-terminal, low dropout, 1 ampere negative voltage regulator available with fixed output voltages of ?5, ?5.2, ?12, and ?15V.
The LM2990 uses new circuit design techniques to provide low dropout and low quiescent current. The dropout voltage
at 1A load current is typically 0.6V and a guaranteed worst-case maximum of 1V over the entire operating temperature range. The quiescent current is typically 1 mA with
1A load current and an input-output voltage differential greater than 3V. A unique circuit design of the internal bias supply limits the quiescent current to only 9 mA (typical)
when the regulator is in the dropout mode (VOUT - VIN ≤ 3V). Output voltage accuracy is guaranteed to ±5% over load,
and temperature extremes.The LM2990 is short-circuit proof, and thermal shutdown includes hysteresis to enhance the reliability of the device when overloaded for an extended period of time. TheLM2990 is available in a 3-lead TO-220 package and is rated 
for operation over the automotive temperature range of
-40℃to +125℃
Parametrics
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Input Voltage -26V to +0.3V
ESD Susceptibility (Note 2) 2 kV
Power Dissipation (Note 3) Internally Limited
Junction Temperature (TJmax) 125℃
Storage Temperature -65℃ to +150℃
Lead Temperature(Soldering, 10 sec.) 260℃
Features
Features
(1) 5% output accuracy over entire operating range;
(2) Output current in excess of 1A;
(3) Dropout voltage typically 0.6V at 1A load;
(4) Low quiescent current;
(5) Internal short circuit current limit;
(6) Internal thermal shutdown with hysteresis;
(7) Functional complement to the LM2940 series
| Image | Part No | Mfg | Description |  |
Pricing (USD) |
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 LM2990T-5.0 |
National Semiconductor (TI) |
Low Dropout (LDO) Regulators |
Data Sheet |
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LM2990T-5.0/NOPB |
National Semiconductor (TI) |
Low Dropout (LDO) Regulators NEG LDO REG |
Data Sheet |
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