L4931ABD33-TR

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PMIC (Power Management integrated circuit) is a one-chip device that combines a number of protection, power supply, regulators, and control circuits. Voltage regulators are an important aspect of PMICs as they are used to regulate the output voltage and current of a source. One example is the L4931ABD33-TR voltage regulator, which is a three-terminal adjustable linear regulator

Application Field

The L4931ABD33-TR Voltage Regulator is designed to provide low dropout voltage and adjustable output voltage in low current applications. It is a high accuracy, low quiescent current voltage regulator, suitable for automotive and industrial applications. It is an ideal choice for post voltage regulation in power management circuits, providing regulated output voltage with high accuracy and low temperature variation.

It is used in a variety of power supply configuration, ranging from dual input (variable voltage) supply to single voltage supply, including AC-DC, DC-DC applications. The L4931ABD33-TR is also ideal for battery-powered applications as it can deliver very low quiescent current, which contributes to increased battery life.

Working Principle

The L4931ABD33-TR Linear Voltage Regulator is based on the error amplifier and PNP bipolar transistor, in which the output voltage is set through an external resistive divider. The error amplifier compares the output voltage to a precision reference voltage with an internal bandgap voltage reference. The voltage difference is amplified by the error amplifier and then applied to the bases of the PNP transistor via an internal feedback network.

When the output voltage is lower than the reference voltage, the error amplifier output voltage increases and turns the PNP transistor on, which increases the current flow and raises the output voltage. Conversely, when the output voltage is higher than the reference voltage, the error amplifier output voltage decreases and turns the PNP transistor off, which decreases the current flow and lowers the output voltage. This feedback loop helps ensure accurate voltage control, making the L4931ABD33-TR ideal for applications that require precise voltage regulation.

In addition, the L4931ABD33-TR features protection features such as overtemperature protection, reverse current and overvoltage protection, and short-circuit protection. The short-circuit protection and overvoltage protection prevent damage to connected components, and the overtemperature protection prevents thermal runaway.

The L4931ABD33-TR is a cost-effective and reliable solution for low power applications, providing adjustable output with high accuracy and low dropout voltage. Its wide input/output range, low quiescent current, and protection features make it ideal for automotive and industrial applications.

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