LM337LMX/NOPB: Adjustable Negative Voltage Regulator

The LM337LMX/NOPB is a three-terminal, adjustable negative voltage regulator manufactured by Texas Instruments (TI). Designed to deliver a stable and customizable negative output voltage, this device is widely used in power supply circuits requiring precise voltage regulation for analog and digital systems.

Key Features

1. Adjustable Output Voltage

• Provides a negative output voltage adjustable from -1.2 V to -37 V using only two external resistors, enabling flexible design for various applications.

1. High Output Current Capability

• Capable of supplying up to 100 mA of output current, making it suitable for low-to-medium power applications.

1. Enhanced Protection Features

• Includes built-in thermal shutdown, current limiting, and safe operating area protection to safeguard against overloading and overheating.

1. Low Dropout Voltage

• Operates efficiently with a low input-to-output differential voltage, reducing power dissipation and improving overall efficiency.

1. Wide Input Voltage Range

• Accepts input voltages up to -40 V, accommodating a broad range of power supply configurations.

1. Compact and Surface-Mount Package

• Housed in an 8-pin SOIC (Small Outline Integrated Circuit) package, the LM337LMX/NOPB is ideal for space-constrained PCB layouts and automated assembly processes.

1. Industrial Temperature Range

• Fully operational from -25°C to +125°C, ensuring reliability in harsh environments, including automotive and industrial applications.

Applications

• Negative Voltage Power Supplies:
• Used in circuits requiring a stable negative rail, such as op-amp power supplies, data acquisition systems, and instrumentation.
• Battery-Powered Equipment:
• Suitable for portable devices where negative voltage generation is necessary.
• Industrial Control Systems:
• Provides reliable negative voltage regulation for sensors, actuators, and communication modules.
• Audio Amplifiers:
• Offers precise negative bias voltage for audio circuitry, improving signal fidelity.

Advantages

• Ease of Use: Simple two-resistor adjustment for output voltage, reducing design complexity.
• Robust Protection: Integrated safety features enhance system reliability and longevity.
• High Efficiency: Low dropout voltage minimizes power loss, improving battery life in portable applications.
• Compact Design: Small SOIC package saves board space while maintaining excellent thermal performance.

Conclusion

The LM337LMX/NOPB is a versatile and reliable solution for designers needing a negative adjustable voltage regulator with high precision, protection, and efficiency. Its wide input voltage range, adjustable output, and industrial-grade temperature rating make it suitable for a variety of applications, from consumer electronics to industrial automation.

For evaluation and prototyping, the LM337LMX/NOPB is readily available through TI’s authorized distributors, with competitive pricing and flexible packaging options.