L4931CD27-TR

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Introduction to L4931CD27-TR

L4931CD27-TR is a Linear Voltage Regulator, part of the PMIC (Power Management Integrated Circuit) family, developed by STMicroelectronics.

A PMIC is an electronic device designed to control and monitor the supply of power to electronic components such as microprocessors, microcontrollers, and digital signal processors. PMICs are used in multiple applications to provide voltage regulation, battery charging and the integration of various power management functions. To meet their various power requirements, the PMICs are optimized to match the power needs of the applications.

L4931CD27-TR is an adjustable linear voltage regulator with Current Limiting, Low Dropout Voltage (LDO) and Low Voltage Capability (LVC). The output of the device is adjustable between 3V to 40V depending on the input voltage range and current limit.

Applications

The L4931CD27-TR LDO Linear Voltage Regulator is ideal for a variety of applications like automotive and industrial power systems, microprocessors, digital signal processors and other low voltage applications, including those with high power requirements.

Due to its adjustable output range, the L4931CD27-TR is suitable for a wide range of voltages. It is also a cost effective solution for medium and high power applications with limited space as the programming and current limiting features reduce complexity and overall system cost.

Working Principle

The L4931CD27-TR LDO is based on a conventional Linear Voltage Regulator circuit diagram. It comprises an Error Amplifier, a voltage reference, an enable pin and a series pass transistor. The error amplifier is a fully differential comparison circuit which monitors the output voltage and outputs an error signal to the reference network. The reference network adjusts the current flowing through the series pass transistor to maintain a constant output voltage.

The enable pin is used to shut down the output voltage, when the voltage output is in excess of the defined operating limit. The enable pin is also used to control the overall quiescent current of the system and can be programmed to provide a power saving mode.

The voltage reference provides a stable output voltage that is independent of temperature, input voltage and load conditions. The current limit of the output drive is adjustable and is used to protect the series pass transistor from short circuit and overload conditions.

Conclusion

The L4931CD27-TR is a Linear Voltage Regulator and is part of the PMIC family developed by STMicroelectronics. It is an adjustable, high precision and low noise LDO device with Current Limiting, Low Dropout Voltage (LDO) and Low Voltage Capability (LVC). Due to its adjustable output range, the L4931CD27-TR is ideal for a variety of applications, including automotive and industrial power systems, microprocessors, digital signal processors and other low voltage applications. The voltage regulation and current limiting features of the device provides cost effective solution for power management and system cost reduction.

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