IC 7905: Negative Voltage Regulator for Stable -5V Output

The IC 7905 is a negative voltage regulator designed to deliver a consistent -5V output from a higher input voltage. It is part of the 79xx series of voltage regulators, which are known for their reliability and precision in providing regulated negative voltages. The 7905 is commonly used in various electronic applications and power supply circuits that require a stable -5V rail.

Key Features and Specifications

• Type: Negative Voltage Regulator
• Output Voltage: -5V
• Input Voltage Range: -7V to -35V (typically -6V to -12V for optimal performance)
• Output Current: 1.5A (maximum)
• Dropout Voltage: 2V (typical)
• Power Dissipation: 15W (with proper heat sinking)
• Package: TO-220

Applications

1. Dual Power Supplies:
   • The IC 7905 is often used in dual power supply designs, where both positive and negative voltages are required. It is paired with a positive voltage regulator (such as the 7805) to provide a balanced power supply solution for electronic circuits and devices.
2. Analog Circuitry:
   • In analog signal processing applications, the IC 7905 provides the necessary negative voltage for operational amplifiers (op-amps) and other analog components. This is crucial for accurate signal amplification and processing in audio equipment, sensors, and analog signal conditioners.
3. Instrumentation:
   • The IC 7905 is employed in instrumentation systems that require precise negative voltage regulation. It is used in laboratory power supplies, test equipment, and measurement devices to ensure stable and accurate performance.
4. Audio Equipment:
   • In audio systems, the IC 7905 provides a stable -5V supply for various analog audio circuits. It is used in audio preamps, mixers, and other audio processing units to ensure consistent power delivery and reliable signal handling.
5. Communication Systems:
   • The IC 7905 is utilized in communication systems where a negative voltage is required for proper operation. It is found in RF circuits, modulators, and communication receivers, helping to maintain stable performance and signal integrity.

Advantages of Using IC 7905

• Stable Output Voltage: The IC 7905 provides a reliable -5V output, which is essential for maintaining consistent performance in electronic circuits and devices.
• High Current Capability: With a maximum current capability of 1.5A, the IC 7905 can handle moderate to high-current loads, making it versatile for various applications.
• Built-in Protection: The IC 7905 includes thermal overload and short-circuit protection, which safeguards the regulator and connected circuits from damage due to excessive heat or current.
• Ease of Integration: Available in a standard TO-220 package, the IC 7905 is easy to integrate into electronic designs and can be mounted on a heatsink for enhanced thermal management.

Conclusion

The IC 7905 negative voltage regulator is a dependable and efficient component for providing a stable -5V output in electronic circuits. Its high current capability, stable voltage regulation, and built-in protection features make it an ideal choice for dual power supplies, analog circuitry, instrumentation, audio equipment, and communication systems. Whether you need to stabilize a negative voltage rail or ensure reliable power for sensitive components, the IC 7905 offers consistent performance and ease of use in various applications.

IC 7805 Regulator (Pack of 5)