L4931CPT50

Current - Output:	250mA
Base Part Number:	L4931C
Supplier Device Package:	PPAK
Package / Case:	TO-252-5, DPak (4 Leads + Tab), TO-252AD
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Part Status:	Obsolete
Packaging:	Tube

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Introduction

Texas Instruments L4931CPT50 is a low dropout (LDO) linear voltage regulator. It features a wide input voltage range of 1.21V to 12V and enables the design of innovative portable and battery-charging applications. It offers an improved ground current level and high ripple rejection capability. The L4931CPT50 works by controlling applied input voltage across the output, thus providing the required voltage to the device. These voltage regulators are widely used in a variety of applications such as automotive, communication, networking, and industrial design.

Features

The L4931CPT50 Low Dropout (LDO) linear voltage regulator has the following features: - Low dropout voltage, typically 50mV at 100mA of load current- Output current up to 100mA- Fixed output voltage is 5V- Input voltage range of 1.21V to 12V- Extremely low quiescent current, only 10 mA- Fast transient response, typically reducing the output voltage change within 1µs- High ripple rejection capability- Excellent thermal stabilityThe L4931CPT50 is also RoHS compliant and pin-out compatible, making it an ideal replacement for older parts.

Working Principle

The L4931CPT50 operates on the same basic principle as other linear voltage regulators. It uses an internal voltage reference to compare the applied input voltage to a required output voltage. When the two voltages match, the regulator circuit begins to work and balance the load current with the provided input voltage. This process is also known as “load regulation”. The circuit uses two transistors – a P-channel and an N-channel MOSFETs. When the input voltage is applied, the source of the P-channel MOSFET receives a positive gate-source voltage and the conduction of current starts. The N-channel MOSFET turns on in the same manner. When the differential input voltage to the regulator circuit is equal to the output voltage, current will begin to flow through both transistors in opposite directions. As a result, the output voltage remains stable, and the load current is regulated.

Applications of the L4931CPT50

The wide input voltage range and low ground current level of the L4931CPT50 make it well suited for use in multiple applications. It can be used to provide a reliable power supply for processor cores in server systems, support voltage regulation in automotive under-hood modules, and provide power for smart metering and industrial Ethernet devices. The L4931CPT50 also makes a great choice for battery chargers and other portable devices. Its high ripple rejection capability and fast transient response make it an ideal choice for applications that require a reliable, efficient and accurate power supply.

Conclusion

The L4931CPT50 is a low dropout linear voltage regulator with a wide input voltage range, low quiescent current, and excellent thermal stability. It is ideal for systems requiring a reliable, efficient, and accurate power supply, as well as portable and battery-charging applications. Furthermore, its extra features like low ground current level, fast transient response, and high ripple rejection capability make it a great choice for multiple demanding applications.

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