L4931ABDT80

Current - Output:	250mA
Base Part Number:	L4931AB
Supplier Device Package:	DPAK
Package / Case:	TO-252-3, DPak (2 Leads + Tab), SC-63
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Current, Over Temperature
Control Features:	--
PSRR:	67dB ~ 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):	8V
Voltage - Input (Max):	20V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Obsolete
Packaging:	Tube

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Introduction

The L4931ABDT80 is a type of linear voltage regulator integrated circuit (IC) manufactured by STMicroelectronics. It is a low-dropout two-terminal device that is capable of delivering up to 800mA of output current and can operate from a wide input voltage range of 1V to 30V. The main advantages of this device are the low quiescent current of 150uA, its small size and lightweight package, which makes it ideal for automotive, industrial and consumer applications.

Application Field

The L4931ABDT80 is well-suited for use in car, consumer, and industrial applications. It can be used to regulate voltages for automotive infotainment clouds, motor controllers, small factory automation systems, consumer devices such as small appliances and power tools, and embedded systems such as those used in industrial control and factory automation systems. It can also be used in battery-powered portable devices such as cell phones, tablets, and portable gaming consoles due to its low quiescent current.

Working Principle

The L4931ABDT80 consists of two main sections; an input section and an output section. The input section is composed of a voltage divider, an error amplifier, and an input comparator. The voltage divider is used to detect the input voltage, and the error amplifier compares the input and output voltages. The output of the error amplifier is fed to the input of the comparator, which is used to control the output voltage of the device via a voltage-regulating transistor.The output section consists of a transistor and a pass element, which is a resistor, inductor, or metal-oxide-semiconductor (MOS) transistor. When the voltage differential between the input and output increases, the error amplifier increases the gate voltage of the control transistor, which turns on more current to the output pass element. This in turn increases the output current, and the output voltage is regulated by the voltage-regulating transistor.

Conclusion

The L4931ABDT80 is a linear voltage regulator IC that is ideal for automotive, industrial and consumer applications. It has a low quiescent current of 150uA and can handle wide input voltages of 1V to 30V, making it very reliable for low-power applications such as embedded systems, battery-powered portable devices, and small factory automation systems. The device is composed of an input section that senses the input voltage, and an output section that uses a voltage-regulating transistor to control the current to the output pass elements.

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