L4931ABDT50-TR Integrated Circuits (ICs)

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:	70dB ~ 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):	5V
Voltage - Input (Max):	20V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Active
Packaging:	Tape & Reel (TR)

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L4931ABDT50-TR Application Field and Working Principle

Among the versatile and highly reliable power management integrated circuit (PMIC) products, the L4931ABDT50-TR stands out. This voltage regulator belongs to the linear category of products and can provide three-terminal adjustable regulator with a large output current, making it an excellent choice for a variety of industrial, automotive, and other applications. Let\'s dive in to discuss its application fields and working principle.

Application field

The L4931ABDT50-TR is primarily used in low dropout (LDO) applications such as portable instrument systems and automotive or transport-level equipment. This voltage regulator is also used for post-regulating 5V voltage sources, signal ground and other low-level circuits. It has a wide operating temperature range (between -40°C and 125°C) and can be used in harsh environmental conditions. It is quite capable in terms of voltage regulation and stands apart from other three terminal linear regulators due to its ability to provide an output current of up to 0.5A. It is equipped with a variety of features that make it well-suited for use in a wide range of applications. Such features include low dropout voltage, low power consumption, high ESD protection, low output noise and good line and load regulation.

Working Principle

The working principle of the L4931ABDT50-TR PMIC is based on three different elements. Firstly, the internal discrete level shifting circuit compensates for the difference between the voltage at the Enable pin (Venable) and the input pin (Vin). Second, a low dropout resistor-controlled voltage regulator is used to generate the stable output voltage (Vout). Finally, a low on-resistance series pass transistor allows for the output current to be delivered with minimal power dissipation. The voltage regulator works by comparing the voltage at the Adj (adjustable) pin with an internal reference voltage. If the voltage at the Adj pin is lower than the reference, the pass transistor conducts and current is delivered to the output pin (Vout). If the voltage at the Adj pin is higher than the reference, the pass transistor is cut off and the output pin (Vout) voltage is reduced. The Enable pin is a comparator that is used to turn the voltage regulator on and off. When the voltage at the Enable pin is lower than the voltage at the Vin pin, it turns off the voltage regulator and cut off the current flow to the output pin. When the voltage at the Enable pin is higher than the voltage at the Vin pin, it turns on the voltage regulator and the current can flow from the input pin to the output pin.To sum up, the L4931ABDT50-TR is a well-balanced, versatile and reliable three-terminal linear voltage regulator that is suitable for a wide range of industrial, automotive and other applications due to its capabilities in voltage regulation, power consumption and ESD protection. It utilizes a discrete level shifting circuit, a low dropout resistor-controlled voltage regulator, and a low on-resistance series pass transistor to deliver the output voltage with minimal power dissipation.

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