L4909

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The L4909 linear voltage regulator is part of STMicroelectronics\' family of fixed output or adjustable negative voltage regulators. As such, it offers a versatile and cost-effective solution for modern power supply design. This article will discuss the L4909\'s application fields and explain its working principle.

The L4909 is a two-terminal, negative voltage regulator that is designed to provide both a fixed and adjustable output current. It features an input voltage range of 0.5V to 15V, while its output voltage range can go up to -15V. This makes it well-suited for power supplies and other applications that feature a wide range of operating voltages. Additionally, the L4909 has a low quiescent current of only 15 mA, which helps to reduce power consumption. This device is available in TO-220 and DPAK packages, allowing it to be used in a variety of design configurations.

Common application fields for the L4909 include portable and mobile devices, where it can provide reliable protection against voltage spikes and other power supply disturbances. It is also used in industrial applications that require robust protection from input power disturbances and noise. Additionally, the L4909 can be used in automotive systems, where it can regulate the voltage of the battery to ensure reliable system operation.

The L4909 circuit is composed of a series of voltage regulator elements. A resistor is connected between the input and output of the device, and this resistor determines the output voltage of the L4909. The output voltage will be regulated depending on the value of the resistor and the total current provided by the L4909.

The L4909 also contains a set of internal protection features, which help to protect it from input voltage surges and other power supply disturbances. These features include a thermal shutdown, which will shut off the L4909 in the event of an excessive temperature rise. A short-circuit protection feature is also included in the device, which will shut off the output in the event of a short circuit to the output or ground. This helps to protect the L4909 from damage in the event of a fault.

The L4909 is designed to regulate the output voltage in a variety of applications. It is typically used to regulate the output voltage of a power supply, but can be used in other applications such as voltage regulator controllers and battery chargers. By using the L4909 and a properly selected resistor, designers can create an adjustable output voltage that meets the system\'s needs.

The L4909 provides an efficient and cost-effective solution for most applications requiring a negative voltage regulator. It is a versatile device that can be used in a variety of different applications. It is also protected by internal safety features, which help to keep the device safe from power supply disturbances. This makes the L4909 a great choice for modern power supply designs.

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