L4931CZ33-AP Integrated Circuits (ICs)

Current - Output:	250mA
Base Part Number:	L4931C
Supplier Device Package:	TO-92-3
Package / Case:	TO-226-3, TO-92-3 (TO-226AA) (Formed Leads)
Mounting Type:	Through Hole
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:	Active
Packaging:	Tape & Box (TB)

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Introduction

The L4931CZ33-AP is a 3-Pin Low Dropout Voltage Regulator. The device provides an output voltage of 3.3V and has a high accuracy of ±1% over a full temperature range. This is a linear regulator, which means that it controls the output voltage by controlling the current flow going through the device. The highly linear design allows the L4931CZ33-AP to provide very low noise and very fast transient response. It is ideal for applications requiring very low dropout voltages and low power dissipation such as embedded systems, digital audio, and battery chargers.

Applications

The L4931CZ33-AP is a versatile device, suitable for a variety of applications. The low dropout voltage, the fast transient response, and the wide input voltage range make it suitable for powering microcontroller-based systems. It can be used in automotive applications, networking systems, and general purpose battery chargers. The device is also ideal for providing power to portable electronics, such as mobile phones and mp3 players. Additionally, the device can be used in lightweight, low noise audio systems, as well as for powering handheld radios.

Features

The L4931CZ33-AP has several features that make it suitable for a variety of applications. The device has a low quiescent current of 8 mA, making it wellsuited for applications such as handheld radios or mobile phones that require a low powering current. It has a high power efficiency of 94%, reducing current drain while providing excellent thermal performance. The wide input voltage range of 3.0V to 30V makes it suitable for applications that require a large input voltage tolerance. The device also has a low operating temperature range of -40°C to 125°C, making it suitable for use in temperature-sensitive applications. Additionally, the device has short circuit and thermal protection with overtemperature warning and shutdown output. This feature helps protect the device from damage due to excessive power dissipation or short circuits.

Working Principle

The L4931CZ33-AP uses a linear approach to regulation. It consists of an internal voltage reference, an error amplifier, and a pass transistor. The internal voltage reference provides a stable reference voltage that is compared with the output voltage by the error amplifier. When there is a difference, the error amplifier will adjust the current going through the pass transistor, thus regulating the output voltage.The device is designed to provide an output voltage of 3.3V, and has an accuracy of ±1%. It can also provide up to 600mA of output current. The wide input voltage range makes it ideal for powering devices that have large variations in their power consumption. Additionally, the low dropout voltage and the low quiescent current help to minimize power dissipation in the device, enabling it to be used in energy-sensitive applications.

Conclusion

The L4931CZ33-AP is a versatile device that is well-suited to a variety of applications. The low quiescent current and high power efficiency make it ideal for use in mobile phones and mp3 players, as well as other portable electronics applications. It has a wide input voltage range and a low dropout voltage, making it suitable for powering microcontroller-based systems. The linear approach to regulation, combined with the fast transient response and the low noise operation, make it well-suited for audio and automotive applications. Overall, the L4931CZ33-AP is an excellent choice for applications requiring very low power dissipation and a precision output voltage of 3.3V.

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