LM2991T/LB03
Obsolete1-A, NEGATIVE, ADJUSTABLE LOW-DROPOUT VOLTAGE REGULATOR WITH ENABLE
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LM2991T/LB03
Obsolete1-A, NEGATIVE, ADJUSTABLE LOW-DROPOUT VOLTAGE REGULATOR WITH ENABLE
Technical Specifications
Parameters and characteristics for this part
| Specification | LM2991T/LB03 |
|---|---|
| Control Features | Enable |
| Current - Output | 1 A |
| Current - Quiescent (Iq) | 700 µA |
| Current - Supply (Max) [Max] | 5 mA |
| Mounting Type | Through Hole |
| Number of Regulators | 1 |
| Operating Temperature [Max] | 125 °C |
| Operating Temperature [Min] | -40 °C |
| Output Configuration | Negative |
| Output Type | Adjustable |
| Package / Case | TO-220-5 Formed Leads |
| PSRR | 60 dB |
| Supplier Device Package | TO-220-5 |
| Voltage - Input (Max) [Max] | -26 V |
| Voltage - Output (Min/Fixed) | -3 V |
| Voltage Dropout (Max) [Max] | 1 V |
Pricing
Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly
| Distributor | Package | Quantity | $ | |
|---|---|---|---|---|
| Digikey | Tube | 1 | $ 4.98 | |
| 10 | $ 4.47 | |||
| 45 | $ 4.22 | |||
| Texas Instruments | TUBE | 1 | $ 3.75 | |
| 100 | $ 3.29 | |||
| 250 | $ 2.31 | |||
| 1000 | $ 1.86 | |||
Description
General part information
LM2991 Series
The LM2991 is a low dropout adjustable negative regulator with a output voltage range between −3 V to −24 V. The LM2991 provides up to 1 A of load current and features aON/OFF pin for remote shutdown capability.
The LM2991 uses new circuit design techniques to provide a low dropout voltage, low quiescent current and low temperature coefficient precision reference. The dropout voltage at 1-A load current is typically 0.6 V and an ensured worst-case maximum of 1 V over the entire operating temperature range. The quiescent current is typically 1 mA with a 1-A load current and an input-output voltage differential greater than 3 V. 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≤ 3 V).
The LM2991 is short-circuit proof, and thermal shutdown includes hysteresis to enhance the reliability of the device when inadvertently overloaded for extended periods. The LM2991 is available in 5-lead TO-220 and DDPAK/TO-263 packages and is rated for operation over the automotive temperature range of −40°C to +125°C. Mil-Aero versions are also available.
Documents
Technical documentation and resources
