onsemi

LM7918CT

LM7918CT Description

The LM7918CT is a fixed-output, negative linear regulator designed for applications requiring a stable -18V output with a maximum current of 1A. Manufactured by onsemi, this regulator is housed in a TO220-3 package, making it suitable for through-hole mounting. Despite being marked as obsolete, the LM7918CT remains a reliable choice for power management applications within its specified operating temperature range of 0°C to 125°C. It features a typical dropout voltage of 2V at 1A, ensuring efficient operation even under varying load conditions. The regulator also includes over-temperature and short-circuit protection, enhancing its robustness and reliability.

LM7918CT Features

• Fixed Negative Output: Provides a stable -18V output voltage, ideal for applications requiring a negative supply rail.
• High Current Capability: Delivers up to 1A of output current, making it suitable for a wide range of power-hungry applications.
• Low Dropout Voltage: A typical dropout voltage of 2V at 1A ensures efficient operation, even under varying load conditions.
• Low Quiescent Current: Consumes only 6 mA in quiescent state, minimizing power loss and improving overall efficiency.
• High PSRR: Offers a power supply rejection ratio (PSRR) of 60dB at 120Hz, ensuring minimal noise and ripple on the output voltage.
• Protection Features: Includes over-temperature and short-circuit protection, enhancing the reliability and robustness of the regulator.
• Moisture Sensitivity Level: MSL 1 (Unlimited), making it suitable for storage and handling in various environments.
• Compliance: REACH Unaffected, ensuring compliance with environmental and safety regulations.

LM7918CT Applications

The LM7918CT is ideal for applications requiring a stable negative supply voltage. Some specific use cases include:

• Power Amplifiers: Provides a stable negative supply rail for audio power amplifiers, ensuring high-fidelity performance.
• Analog Circuits: Suitable for analog-to-digital converters (ADCs) and digital-to-analog converters (DACs) that require a negative reference voltage.
• Industrial Equipment: Ideal for industrial control systems and instrumentation that require a reliable negative power supply.
• Telecommunications: Can be used in telecommunication equipment where a stable negative voltage is needed for biasing and power supply purposes.

Conclusion of LM7918CT

The LM7918CT is a robust and reliable linear regulator designed for applications requiring a stable -18V output. Its low dropout voltage, low quiescent current, and high PSRR make it an efficient choice for power management tasks. The inclusion of over-temperature and short-circuit protection ensures that the regulator can withstand harsh operating conditions, making it a dependable component in various electronic systems. Despite being marked as obsolete, the LM7918CT remains a viable option for designers looking for a proven solution in their power management designs.