L4931ABPT33-TR Integrated Circuits (ICs)

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The L4931ABPT33-TR is a low drop out linear voltage regulator belonging to external use linear voltage regulator category. It has been designed with a low dropout voltage and low noise feature, making it ideal for applications requiring voltage regulation from a wide supply range. This linear voltage regulator is available in the TO-92 package, and cuts down the power dissipation considerably by providing ultra-low-dropout voltage. A low output voltage is also provided, which gives it a greater efficiency.

The L4931ABPT33-TR is a monolithic integrated circuit intended for external voltage regulation in applications requiring three terminal, minimum input down to 1.2V and output voltage up to 18 volts. It can deliver up to 250mA of regulated current, with a maximum drop out voltage of 150mV. Features such as temperature and load stability, fast response time, low power loss and current limiting are integrated into the device and are designed to enhance its application in a variety of contexts.

Application Field

The L4931ABPT33-TR voltage regulator can be used for various application fields, due to its high performance features. These can range from portable electronics, such as cellular phones, digital cameras, and personal digital assistants, to power management applications such as battery chargers, secondary supplies, and motor control systems. Its low dropout voltage and high efficiency also prove to be beneficial in applications where a small and reliable supply is required.

Furthermore, it is also suitable for applications where maximum power dissipation has to be minimized, such as in mains-powered equipment and in automotive electronic systems. This linear regulator also boasts consistent performance across a wide temperature range, making it possible to use it in even the harshest environments.

Working Principle

The L4931ABPT33-TR voltage regulator works by using a three-terminal voltage reference with a fixed output of 1.2 V and an adjustable threshold voltage. This is used to compare the input voltage to the reference and adjust the output voltage accordingly. Whenever there is a discrepancy between the input and the reference, the internal circuitry of the regulator adjusts its control signal, varying the output voltage as necessary. This provides a stable output voltage that is compatible with the input supply.

In more detail, the low dropout voltage is achieved by using a dual N-channel MOSFET structure which operates with a higher current density than common linear regulators. This structure combines the advantages of a low cost PNP pass transistor, with a low quiescent current, low dropout voltage, and small size. The output voltage is finely tuned by a resistor divider network, which is used to monitor the output voltage.

The L4931ABPT33-TR also features a low noise design due to its low current ripple, which reduces the amount of electrical noise that is generated in the application. The device also has a current limiting threshold, which is designed to protect the regulator from exceeding its maximum current limit. Finally, the device is equipped with a thermal shutdown feature, which ensures that the device will not overheat and is protected from any damage that could result from such an event.

Conclusion

The L4931ABPT33-TR is an ideal choice for applications requiring voltage regulation from a wide supply range, due to its low dropout voltage, low noise design and its wide range of features. This linear regulator is highly reliable and has been proven to provide consistent performance in various application fields. With its low power loss, current limiting and thermal shutdown features, this three-terminal voltage regulator is ideal for applications that require high efficiency and protection from overcurrent.

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