The NJM7905A is a 3-Terminal Negative Voltage Regulator. Manufactured by New Japan Radio (NJR), this monolithic integrated circuit provides a fixed negative output voltage of -5V. It's designed for a wide range of applications requiring stable negative voltage supplies.

Applications

• Power Supplies: Used in various power supply circuits to provide a regulated -5V output.
• Linear Regulators: Serves as a negative voltage regulator in linear regulation applications.
• Instrumentation: Employed in instrumentation equipment requiring stable negative voltage rails.
• Microprocessor Systems: Provides the necessary negative voltage for certain microprocessor and microcontroller applications.
• Industrial Control Systems: Integrated into industrial control systems to supply stable power to sensitive components.

Features

• Fixed Output Voltage: Provides a stable -5V output.
• Internal Short-Circuit Current Limiting: Protects the regulator from damage due to output short circuits.
• Internal Thermal Overload Protection: Shuts down the regulator if the junction temperature exceeds a safe limit.
• Output Transistor Safe-Area Compensation: Enhances the reliability of the regulator by preventing secondary breakdown.
• High Ripple Rejection: Effectively filters out ripple voltage from the input, providing a cleaner output voltage.

Benefits

• Stable Voltage Supply: Ensures a consistent -5V output, crucial for reliable circuit operation.
• Overload Protection: Safeguards the regulator and connected components from damage due to overcurrent or overheating.
• Simplified Circuit Design: Requires minimal external components, simplifying the design process.
• Improved System Reliability: Enhances the overall reliability of the system due to the built-in protection features.
• Cost-Effective Solution: Offers a relatively inexpensive solution for negative voltage regulation.

Additional Details

The NJM7905A typically requires only a few external components for proper operation, such as input and output capacitors for stability. It is available in various package types, including TO-220 and surface-mount options. The maximum input voltage is generally around -35V, but it is important to consult the datasheet for specific ratings. The output current capability is typically 1A, but this can vary depending on the package and thermal conditions. The operating temperature range is usually from -40°C to +85°C. Refer to the manufacturer's datasheet for comprehensive electrical characteristics and application guidelines.