L4931ABPT120

The L4931ABPT120 is a voltage regulator, linear type, made by STMicroelectronics for use in Power Management Integrated Circuits (PMIC). The regulator is designed to provide an efficient power supply for low power applications with minimal board space. It has several features which make it stand out in comparison to other voltage regulators in its class.

Application Field

The L4931ABPT120 is designed for multiple applications, such as system-level power buses, battery charging and protection, and general power management applications. This voltage regulator can provide precise voltage regulation in the range of 1.2V to 3.63V with output currents of up to 1.0A. It is used widely in consumer electronics, industrial, and automotive applications.

Working Principle

The L4931ABPT120 integrates all necessary linear and control circuit into a single 28-lead package in order to provide an easy power solution for various low voltage applications. This voltage regulator works on a two-phase system, where the voltage is regulated by an initial phase of sensing the available voltage in order to adjust the bias resistance of a reference voltage. The second phase is the control phase which provides the precise output voltage through the Pulse Width Modulation (PWM).

The PWM feedback is controlled by the difference between the output voltage and the reference voltage (which is adjustable with a precision potentiometer). The output voltage is kept stable by controlling the duty cycle of the PWM signal, hence the output voltage is tightly regulated.

Package

The L4931ABPT120 is packaged in an industry-standard 28-lead SSOP package. This package makes the voltage regulator suitable for use in various applications, where a small form-factor package is desired. It has a tight line and load regulation (1.2% over the adjustment range of 1.2V to 3.63V) and a low value of power supply mass (down to 11mV).

Conclusion

The STMicroelectronics L4931ABPT120 is a low-power, high-efficiency voltage regulator that is suitable for a wide range of applications in Power Management ICs. This voltage regulator can provide precise voltage regulation in the range of 1.2V to 3.63V with output currents of up to 1.0A and is easily adjustable with a precision potentiometer. It is packaged in a 28-lead SSOP package and has a tight line and load regulation.