L4931CD50-TR Integrated Circuits (ICs)

Current - Output:	250mA
Base Part Number:	L4931C
Supplier Device Package:	8-SO
Package / Case:	8-SOIC (0.154", 3.90mm Width)
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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Introduction

The L4931CD50-TR is a three-terminal low drop voltage regulator for use in electronic systems that require both high performance and low voltage drop. It features an extremely low dropout voltage, low power dissipation, low quiescent current, and a huge output voltage accuracy (±1%). This voltage regulator is well-suited to many applications, including microprocessor supply circuits, potentiometers, battery chargers, or replacement of costly fixed regulators.

Application Field

The L4931CD50-TR is designed for applications where low dropout voltage and high output accuracy are required. These applications include, but are not limited to, battery-powered systems such as mobile phones, portable electronics, Personal Digital Assistants (PDAs), and laptop computers. It is also suitable for automotive applications, as it is designed to operate over a wide temperature range of -40°C to 150°C. In addition, the L4931CD50-TR is excellent for microprocessor supplies, potentiometers, and replacement of costly fixed regulators. It is extremely user-friendly, allowing designers to optimize the power dissipation with simple resistor dividers. In this way, the device can be configured to require only 10mV of dropout voltage when output voltages are at their minimum, enabling the device to achieve very high load current ratings compared to other devices within its class.

Working Principle

At its core, the L4931CD50-TR is a monolithic three-terminal voltage regulator designed to maintain a constant output voltage. It can be used as either a voltage source or a voltage sink. Its output voltage may be adjusted by adding an external reference voltage, provided by a resistor divider and a Zener diode. The reference voltage determines the output voltage, while the device\'s current limit is set by a current sense resistor connected between the output and ground.The L4931CD50-TR also offers protection against short circuits, as well as thermal shutdown. Its stabilizing loop is controlled by an internal error amplifier. This amplifier senses the difference between the reference voltage and the voltage at the output, and sends an error signal to a control circuit which, in turn, regulates the output voltage.

Conclusion

The L4931CD50-TR from STMicroelectronics is a versatile three-terminal low drop voltage regulator that is ideal for battery- and automotive-based applications. It features an extremely low dropout voltage, low power dissipation and quiescent current, and a wide output voltage accuracy (+/- 1%). In addition, its user-friendly configuration allows for easy adjustment of power dissipation to achieve maximum efficiency.

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