L4931ABZ120

Current - Output:	250mA
Base Part Number:	L4931AB
Supplier Device Package:	TO-92-3
Package / Case:	TO-226-3, TO-92-3 (TO-226AA)
Mounting Type:	Through Hole
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Current, Over Temperature
Control Features:	--
PSRR:	64dB ~ 55dB (120Hz ~ 10kHz)
Current - Supply (Max):	7mA
Current - Quiescent (Iq):	1.6mA
Series:	--
Voltage Dropout (Max):	0.8V @ 250mA
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	12V
Voltage - Input (Max):	20V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Obsolete
Packaging:	Bulk

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Introduction

The L4931ABZ120 is a linear voltage regulator for power management applications. It is a high-performance, low-noise voltage regulator designed for use in high-power systems and can deliver up to 1.2A of continuous output current. It is also able to provide both positive and negative outputs at high efficiency. It is designed to be used as an overall voltage regulator, performing various tasks such as current limiting, overvoltage protection, thermal protection, and protection against line transients. All of these features make the L4931ABZ120 an ideal choice for a wide range of power management applications.

Application Field

The L4931ABZ120 is suitable for a wide range of applications, such as computer systems, power supplies, automotive, industrial, and communications systems. It can be used to regulate both ripple and line voltage variations, protecting the system from voltage spikes and other possible line hazards. It is also able to provide current limiting, thermal protection and an overvoltage protection with a tight ±1% accuracy. Its wide input voltage range and high efficiency make it a reliable and long-lasting voltage regulator.

Working Principle

The working principle of the L4931ABZ120 is based on the buck-boost architecture. It combines the features of a standard buck regulator with those of a boost converter, enabling the device to accept a wide range of input voltages. The input voltage is first reduced by the internal power MOSFET, and then it is further regulated by the internal voltage regulator. The device features an integrated power MOSFET that acts as a variable switch to provide a constant output voltage. The output voltage is controlled by an external voltage divider resistor and the internal current limit circuitry. In addition, the IC also features a Soft-Start feature that limits inrush current during startup.

Conclusion

The L4931ABZ120 is a high-performance, low-noise linear voltage regulator that is ideal for power management applications. It can deliver up to 1.2A of continuous output current and provide positive and negative outputs at high efficiency. It features a wide input voltage range, high efficiency, overvoltage protection, and thermal protection. Its buck-boost architecture makes it an ideal choice for a wide range of applications.References

1. STMicroelectronics, L4931ABZ120, Low-Noise Voltage Regulator, Rev. 9, January 2021.
2. T. R. Holden, Basic Linear Design, Second Edition, Butterworth-Heinemann, Oxford, 2015.
3. U. Reichert and M. Gintl, Power Electronics Applications, Taylor & Francis Group, London, 2018.

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