L4931CDT33

Current - Output:	250mA
Base Part Number:	L4931C
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:	73dB ~ 55dB (120Hz ~ 10kHz)
Current - Supply (Max):	6mA
Current - Quiescent (Iq):	1mA
Series:	--
Voltage Dropout (Max):	0.8V @ 250mA
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	3.3V
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Part Status:	Obsolete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 L4931CDT33 is a low dropout linear voltage regulator. It operates from input voltages of up to 33V, and provides a stable output voltage range of 0.8V to 22V. It is a monolithic integrated circuit that features excellent line regulation, low noise, and output voltage accuracy. It is designed to provide high efficiency and low dropout voltage at high load currents, making it an ideal solution for applications where a reliable, low-power solution is required.

Application Field

The L4931CDT33 is a versatile linear voltage regulator that can be used in a wide range of applications, such as in automotive, industrial and consumer electronics. It can be used in automotive audio, voltage regulation for LCDs, for powering computer peripherals, for supplying the power for small appliances, for power management of handheld devices, and for general-purpose circuit protection.

Features

The main features of the L4931CDT33 include its low quiescent current, precision output voltage accuracy and low dropout, as well as its high ripple rejection and fast transient response. It is also engineered with under-voltage, short-circuit, and over-temperature protection. As such, the voltage regulator is especially suitable for meeting the strict current limiting requirements of automotive, industrial and consumer electronics applications.

Working Principle

The L4931CDT33 works on a zener-diode principle. It internalizes a zener diode, MOSFET, and PNP transistor along with other components, which enable the linear voltage regulator to accurately regulate the output voltage from the input source. When the input voltage rises above the output voltage by a certain value, the voltage regulator diverts the extra current to the output. The PNP transistor serves to sense the input voltage and to vary the power applied to the MOSFET, thus controlling the output voltage.

Advantages

The L4931CDT33 offers several advantages over other linear voltage regulator designs. It provides excellent operational stability, low noise, and fast transient response. It is able to accurately maintain a stable output voltage with a maximum dropout voltage of 1.2 V. The voltage regulator is simple to use and can be easily interfaced with power supplies and digital control circuits. It also offers excellent thermal stability with a typical temperature coefficient of just 83 ppm/°C and can dissipate up to 500mW of power at high temperatures.

Conclusion

The L4931CDT33 linear voltage regulator is an ideal choice for a variety of applications where a reliable, low-power solution is required. With its excellent line regulation, low noise and output voltage accuracy, it is an excellent choice for automotive, industrial and consumer electronics applications. With its high efficiency and low dropout voltage, it can accurately regulate the output voltage with a maximum dropout voltage of 1.2V. It is engineered with under-voltage, short-circuit, and over-temperature protection making it an excellent choice for meeting the strict current limiting requirements of any application.

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