L4931ABD50

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The L4931ABD50 is a low drop voltage regulator (LDO) from STMicroelectronics which belongs to the Linear Voltage Regulators within Power Management Integrated Circuits (PMIC). The device is specifically designed to provide low drop output at low power from either a positive or a split voltage supply. It has a low quiescent current and further includes a low bandgap and a low drop feature for improved accuracy, power saving and protection against the over-voltage and reverse-voltage situations.

The L4931ABD50 offers high degree of precision and stability, making it ideal for powering devices such as microcontrollers and sensors as well as low voltage logic and analog circuits. It is also extensively used in automotive applications due to its high temperature operating range.

L4931ABD50 Application Field

The L4931ABD50 is often used in automotive systems and is recommended for powering devices that require low drop and low power. The device is suitable for applications such as smart metering, automotive interior lighting and general interface. It is also used in medical applications such as medical stored energy devices, portable medical instruments and adjustable drives, and in communications applications including modems, sensors, GPS and network antennas.

L4931ABD50 Working Principle

The L4931ABD50 voltage regulator utilizes an adjustable transistor in a standard Darlington configuration for the output stage and a bipolar transistor as the error amplifier circuit. The Darlington configuration consists of two transistors connected in tandem, so that the current gain of one transistor is boosted to produce the desired current gain of the entire circuit. This allows the output voltage to be greater than the base voltage of transistors in the Darlington, resulting in a voltage that can be adjusted precisely to the desired output.

The error amplifier is employed to compare the reference voltage to the output voltage. If there is a difference between the reference voltage and the output voltage, the error amplifier will act as a voltage-controlled current source to regulate the output voltage until it reaches the reference voltage.

The L4931ABD50 offers various protection features for improved accuracy and safety. These features include a Thermal Shutdown feature which will reduce the output current to a safe level in case of overheating, an Over-Voltage Protection that prevents the device from operating above its rated maximum voltage, and a Reverse-Voltage Protection that prevents the device from operating at voltages below the minimum rated voltage.

The L4931ABD50 offers high precision and stability, making it suitable for a wide range of applications. It is a cost-effective solution for powering low voltage logic and analog circuits, and provides enhanced protection against over-voltage and reverse-voltage situations.

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