Overview
The LM2990SX-15/NOPB is a three-terminal, low-dropout negative voltage regulator produced by Texas Instruments. This device is part of the LM2990 series, which offers fixed output voltages of −5 V, −5.2 V, −12 V, and −15 V. The LM2990SX-15/NOPB specifically provides a fixed output voltage of −15 V. It is designed to provide low-dropout and low-quiescent current, making it ideal for dual-supply systems and applications requiring stable negative voltage regulation.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Voltage | −26 | 0.3 | V | |
| Output Voltage (VOUT) | −15.30 | −15 | −14.70 | V |
| Output Current (IOUT) | 1 | A | ||
| Dropout Voltage (VDO) at 1 A | 0.6 | 1 | V | |
| Quiescent Current (Iq) | 9 | 50 | mA | |
| Line Regulation | 6 | 60 | mV | |
| Load Regulation | 3 | 50 | mV | |
| Ripple Rejection | 42 | 52 | dB(min) | |
| Output Noise (10 Hz to 100 kHz) | 500 | 1500 | μV(max) | |
| Long-term Stability (1000 hours) | 2000 | ppm | ||
| Junction Temperature (TJmax) | 125 | °C | ||
| Storage Temperature (Tstg) | −65 | 150 | °C |
Key Features
- Fixed output voltage of −15 V with ±5% accuracy over the entire operating range.
- Low-dropout voltage typically 0.6 V at 1 A load current.
- Low quiescent current.
- Output current in excess of 1 A.
- Thermal shutdown protection to prevent overheating.
- High ripple rejection (42 dB to 52 dB at 1 kHz).
- Low output noise (500 μV to 1500 μV from 10 Hz to 100 kHz).
Applications
The LM2990SX-15/NOPB is suitable for various applications requiring stable negative voltage regulation, including:
- Dual-supply systems, particularly when used in conjunction with positive voltage regulators like the LM2940 series.
- Fixed or adjustable current sink loads.
- Systems requiring low-dropout and low-quiescent current characteristics.
Q & A
- What is the fixed output voltage of the LM2990SX-15/NOPB? The fixed output voltage is −15 V.
- What is the typical dropout voltage at 1 A load current? The typical dropout voltage is 0.6 V.
- What is the maximum output current of the LM2990SX-15/NOPB? The maximum output current is in excess of 1 A.
- Does the LM2990SX-15/NOPB have thermal protection? Yes, it includes thermal shutdown protection.
- What is the ripple rejection of the LM2990SX-15/NOPB? The ripple rejection is between 42 dB and 52 dB at 1 kHz.
- What is the output noise of the LM2990SX-15/NOPB? The output noise is between 500 μV and 1500 μV from 10 Hz to 100 kHz.
- What are the storage temperature limits for the LM2990SX-15/NOPB? The storage temperature range is from −65°C to 150°C.
- What is the junction temperature limit for the LM2990SX-15/NOPB? The junction temperature limit is 125°C.
- Can the LM2990SX-15/NOPB be used in dual-supply systems? Yes, it is ideally suited for dual-supply systems.
- What are the package options for the LM2990SX-15/NOPB? It is available in the DDPAK/TO-263 (KTT) package.
