Overview
The LM2990T-12/NOPB is a three-terminal, low-dropout, negative voltage regulator produced by Texas Instruments. This regulator is designed to provide fixed output voltages of −5 V, −5.2 V, −12 V, and −15 V, with the specific model LM2990T-12/NOPB offering a fixed output voltage of −12 V. It is part of the LM2990 series, which is ideal for dual-supply systems and can also be used as a fixed or adjustable current sink load.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Fixed Output Voltage | −12 V | V |
| Input Voltage Range | −26 V to −6 V | V |
| Output Current (Max) | 1 A | A |
| Dropout Voltage (Typical) | 0.6 V | V |
| Quiescent Current (Typical) | 1 mA | mA |
| Output Voltage Accuracy | ±5% | % |
| Operating Temperature Range | −40°C to 125°C | °C |
| Package Type | TO-220 | |
| Thermal Resistance (θJA) | 23 °C/W | °C/W |
| Output Noise (10 Hz to 100 kHz, IOUT = 5 mA) | 250 μVrms | μVrms |
| PSRR @ 100 kHz | 23 dB | dB |
Key Features
- Low Dropout Voltage: Typically 0.6 V at 1-A load current, ensuring efficient voltage regulation.
- High Output Current: Capable of delivering up to 1 A of output current.
- Low Quiescent Current: Typical quiescent current of 1 mA, contributing to low power consumption.
- High Accuracy: Output voltage accuracy of ±5% over the entire operating range.
- Broad Operating Temperature Range: Operates from −40°C to 125°C, making it suitable for various environmental conditions.
- Low Noise: Output noise of 250 μVrms from 10 Hz to 100 kHz at 5 mA output current.
- Good PSRR: Power Supply Rejection Ratio (PSRR) of 23 dB at 100 kHz.
Applications
The LM2990T-12/NOPB is ideally suited for dual-supply systems, where it can be used in conjunction with positive voltage regulators like the LM2940 series. It is also applicable as a fixed or adjustable current sink load in various electronic circuits. Other potential applications include:
- Power supplies for analog and digital circuits.
- Audio and video equipment requiring stable negative voltages.
- Industrial control systems and instrumentation.
- Medical devices and equipment.
Q & A
- What is the fixed output voltage of the LM2990T-12/NOPB?
The fixed output voltage of the LM2990T-12/NOPB is −12 V.
- What is the input voltage range for the LM2990T-12/NOPB?
The input voltage range is from −26 V to −6 V.
- What is the maximum output current of the LM2990T-12/NOPB?
The maximum output current is 1 A.
- What is the typical dropout voltage of the LM2990T-12/NOPB?
The typical dropout voltage is 0.6 V at 1-A load current.
- What is the quiescent current of the LM2990T-12/NOPB?
The typical quiescent current is 1 mA.
- What is the output voltage accuracy of the LM2990T-12/NOPB?
The output voltage accuracy is ±5% over the entire operating range.
- What is the operating temperature range of the LM2990T-12/NOPB?
The operating temperature range is from −40°C to 125°C.
- What type of package does the LM2990T-12/NOPB come in?
The LM2990T-12/NOPB comes in a TO-220 package.
- What is the thermal resistance (θJA) of the LM2990T-12/NOPB?
The thermal resistance (θJA) is 23 °C/W.
- What are some common applications of the LM2990T-12/NOPB?
Common applications include dual-supply systems, audio and video equipment, industrial control systems, and medical devices.
