L4931CD27-TRY

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Power management integrated circuits (PMICs) are important devices designed to efficiently manage power and enable better overall performance of other electrical components. At the heart of these power management systems is the voltage regulator, which is responsible for regulating the output voltage of the PMIC. The L4931CD27-TRY is a linear voltage regulator from STMicroelectronics that is particularly well-suited for applications requiring a range of operating output voltages. In this article, we will discuss the application field and working principle of the L4931CD27-TRY.

Application Field

The L4931CD27-TRY is a low-dropout linear voltage regulator specifically designed for a wide range of applications such as portable electronic devices (e.g. cellphones and PDAs), battery-powered appliances, and automotive systems. It is also suitable for other electronic applications that require an adjustable output voltage, such as computers and servers, networking products, and communications products.

The L4931CD27-TRY features an adjustable output voltage of between 2V and 10V with a minimum dropout voltage of 0.2V. It can also operate in both normal voltage regulation mode, as well as in short-circuit protection mode for added protection. The device is packaged in an 8-pin DIP (dual in-line package) and is suited for both surface-mount and through-hole applications.

Working Principle

The L4931CD27-TRY is a low-dropout linear voltage regulator that uses an internal pass transistor to regulate the output voltage of the device. The output voltage is determined by the ratio of two external resistors, which are connected between the reference voltage input pin and the output pin of the device. The reference voltage is generated by the internal bandgap voltage reference, which is typically 1V. The pass transistor, which is connected between the input voltage and the output voltage, ensures that the output voltage stays within the required range, even if the input voltage changes.

The L4931CD27-TRY also includes over-voltage, current-limit, and thermal-protection circuitry to prevent any damage from occurring due to excessive current or temperature. To enable short-circuit protection mode, a capacitor must be connected between the external RESET and GROUND pins. In this mode, the device will activate a current-limit circuit when it senses an abnormally high current. If the current continues to exceed the set limit, the device will shut-off the pass transistor, preventing further damage.

Conclusion

The L4931CD27-TRY is a low-dropout linear voltage regulator designed for a wide range of applications. It features an adjustable output voltage of between 2V and 10V with a minimum dropout voltage of 0.2V, and can operate in both normal voltage regulation mode and in short-circuit protection mode. The device is packaged in an 8-pin DIP and is suited for both surface-mount and through-hole applications. With its adjustable output voltage, current-limit protection, and thermal protection features, the L4931CD27-TRY make it an ideal choice for a variety of portable, automotive, and other electronic applications.

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