Texas Instruments

UA78L09ACDR

UA78L09ACDR Description

The UA78L09ACDR is a fixed-output linear voltage regulator designed by Texas Instruments. This regulator is part of the Linear & Switching Voltage Regulators category and is ideal for applications requiring a stable 9V output voltage with a maximum input voltage of 24V. The device is capable of delivering a continuous output current of 100mA, making it suitable for a variety of low-power applications. The UA78L09ACDR features a dropout voltage of 1.7V at 40mA, ensuring efficient regulation even at lower input-to-output voltage differences.

The regulator is housed in an 8-lead SOIC package, which is both compact and suitable for surface-mount applications. It operates within a temperature range of 0°C to 125°C, making it suitable for use in a wide range of environmental conditions. The UA78L09ACDR also includes several protection features such as over-current, over-temperature, reverse polarity, and short-circuit protection, enhancing its reliability and robustness.

UA78L09ACDR Features

• Fixed Output Voltage: The UA78L09ACDR provides a stable 9V output voltage, ensuring consistent power supply to connected devices.
• High Input Voltage Range: With a maximum input voltage of 24V, the regulator can handle a wide range of input voltages, making it versatile for various power supply designs.
• Low Dropout Voltage: At 1.7V dropout voltage at 40mA, the UA78L09ACDR maintains efficiency even when the input voltage is close to the output voltage.
• Protection Features: Over-current, over-temperature, reverse polarity, and short-circuit protection ensure the regulator's longevity and reliability.
• Surface Mount Package: The 8-lead SOIC package is compact and suitable for surface-mount technology, facilitating integration into modern PCB.
  designs- Wide Operating Temperature Range: The regulator operates reliably from 0°C to 125°C, making it suitable for applications in varying environmental conditions.
• High Power Supply Rejection Ratio (PSRR): With a PSRR of 45dB at 120Hz, the regulator effectively filters out noise from the input power supply, ensuring clean output voltage.

UA78L09ACDR Applications

The UA78L09ACDR is well-suited for a variety of applications where a stable 9V supply is required. Some specific use cases include:

• Consumer Electronics: Ideal for powering low-power devices such as portable radios, MP3 players, and other battery-operated gadgets.
• Industrial Equipment: Suitable for powering sensors, microcontrollers, and other low-power components in industrial control systems.
• Telecommunications: Can be used in low-power communication devices and peripherals where a stable voltage supply is crucial.
• Automotive: Given its wide operating temperature range and robust features protection, the UA78L09ACDR is suitable for automotive applications where reliability is paramount.

Conclusion of UA78L09ACDR

The UA78L09ACDR from Texas Instruments is a reliable and efficient fixed-output linear voltage regulator. Its combination of a stable 9V output, wide input voltage range, and low dropout voltage makes it an excellent choice for a variety of low-power applications. The inclusion of multiple protection features ensures that the regulator can withstand harsh operating conditions, enhancing its durability and reliability. The compact 8-lead SOIC package and surface-mount compatibility make it easy to integrate into modern PCB designs. Whether used in consumer electronics, industrial equipment, telecommunications, or automotive applications, the UA78L09ACDR provides a stable and efficient power solution.