The UTC QD78L09 is a three-terminal positive voltage regulator designed for a wide range of applications. This regulator provides a stable and regulated 9V output with a low dropout voltage. It is ideal for applications where a precise and reliable voltage source is required. The QD78L09 features built-in short-circuit protection, over-temperature protection, and current limiting, ensuring safe and reliable operation. Its compact TO-92 package makes it suitable for space-constrained designs.

Applications

• Linear Regulators
• Battery Chargers
• Instrumentation
• Microprocessor Power Supplies
• Consumer Electronics

Features

• Output Voltage: 9V
• Output Current: 100mA
• Low Dropout Voltage
• Thermal Overload Protection
• Short Circuit Protection
• Output Transistor Safe-Area Compensation
• TO-92 Package

Benefits

• Stable and Regulated Output: Provides a consistent 9V output voltage, ensuring reliable performance of connected devices.
• Overload Protection: Protects the regulator and connected devices from damage due to short circuits or excessive current draw.
• Thermal Protection: Prevents overheating and ensures reliable operation in high-temperature environments.
• Compact Size: The small TO-92 package allows for easy integration into space-constrained designs.
• Cost-Effective: Provides a simple and cost-effective solution for voltage regulation.

Additional Details

The QD78L09 requires a minimum input voltage of approximately 11V to maintain a stable 9V output. The dropout voltage is typically around 2V at the rated output current. The regulator is designed to operate over a wide temperature range, typically from -40°C to +125°C. It is crucial to provide adequate heat sinking, especially at higher input voltages and output currents. The regulator is available in a standard TO-92 package with three leads: input, ground, and output. When designing with the QD78L09, it is important to consider the input voltage range, output current requirements, and thermal management to ensure optimal performance and reliability.