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PMIC - Voltage Regulators - Linear

The L4931ABPT25TR is a two-terminal low drop voltage regulator designed to provide a stable output voltage with ultra-low dropout. It has a wide input voltage range of up to 40V and is able to deliver up to 3A output current. It is a three-terminal device built with an integrated pnp transistor, an adjustable voltage reference and threshold, and a series controlled loop.

Application Field

This voltage regulator is suitable for bidirectional applications, such as automotive, industrial, aerospace and defense. It is often used in applications such as power supplies, AC-DC adapter/chargers, DC-DC converters, motor drives, telecommunication and medical equipment.

Working Principle

The L4931ABPT25TR has three terminals: VIN, VOUT and CTRL. VIN is the supply terminal that supplies the inputcurrent to the regulator. VOUT is the voltage output terminal and CTRL is the control terminal. The CTRL terminal is used to adjust the output voltage of the regulator by controlling the pnp transistor. The voltage reference and threshold in the device provide feedback for the loop control to adjust the output voltage.

The voltage regulator operates in two phases. First, the pnp transistor is turned on and regulates the voltage at the collector of the transistor. Second, the voltage reference and threshold provide feedback for the loop control to adjust the output voltage. The output voltage is determined by the current in the control loop.

The L4931ABPT25TR is capable of synchronizing its output to another converter’s pulse frequency and amplitude over a wide range of input voltage and current. It provides excellent line and load regulation, and offers exceptional transient response. It is a low noise and extremely fast switching regulator, with low output impedance and low EMI characteristics.

The L4931ABPT25TR is an ideal choice for applications requiring an adjustable voltage regulator with ultra-low dropout, high efficiency and excellent load regulation. It is a robust, reliable and accurate device with high power density, long life, and low noisy operation.

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